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Re: how "tight" should the crankshaft be with new bearings?
Do you want me to use the book that I used for the 4 years that I worked in
a racing engine shop, or do you have a specific one in mind? Chris "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com... > That's on new: > > not a regrind. > > So like I said, go look in the book that crankshaft grinders use. You'll be > surprised, and more surprised at what they use for gauges to check the > stones when they dress them. > > Refinish King > > > "c" <c@me.org> wrote in message > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com... > > I guess Lunati and all of the other aftermarket crank manufacturers have > > been doing it wrong all these years. > > > > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html > > > > It is common knowledge that a radius reduces the chance for a stress crack > > by ditributing the stresses evenly across the radius. The bigger the > radius, > > the more area to absorbs stresses. > > > > Chris > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com... > > > It's called a bearing knife or bearing scraper: > > > > > > But, if you have an excessively large fillet radius, especially in a > cast > > > iron crankshaft. that is the perfect place for a radial crack to begin. > > > > > > The fillet radius should be ground with the stone dressed to the propper > > > radius for the crankshaft in the machine. > > > > > > Refinish King > > > > > > > > > "HLS" <Sorry@nospam> wrote in message > > > news:10719qskrk8ad4f@corp.supernews.com... > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com... > > > > > If they did that: > > > > > > > > > > They're asking for a crack to happen. Read the manual, for every > > crank, > > > > > there is a specified fillet radius! > > > > > > > > > > Refinish King > > > > > > > > A radiused fillet is less likely to crack than a sharply ground one, > re > > > the > > > > stress raiser > > > > phenomenon we have discussed before.. I think that more often than > not, > > > the > > > > fillet > > > > is not intented to be left overly large...it is probably a result of > > less > > > > than precise machining. > > > > > > > > It can interfere with the edge of the bearing, just as "c" said. > > > > > > > > I never heard of anyone using narrower bearings, but they do 'relieve' > > the > > > > edge of the > > > > bearing where it might contact the fillet. > > > > > > > > Seems I have seen a special tool to do this, but don't have one > myself. > > > > > > > > > > > > > > > > > > > > > > > > |
Re: how "tight" should the crankshaft be with new bearings?
Do you want me to use the book that I used for the 4 years that I worked in
a racing engine shop, or do you have a specific one in mind? Chris "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com... > That's on new: > > not a regrind. > > So like I said, go look in the book that crankshaft grinders use. You'll be > surprised, and more surprised at what they use for gauges to check the > stones when they dress them. > > Refinish King > > > "c" <c@me.org> wrote in message > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com... > > I guess Lunati and all of the other aftermarket crank manufacturers have > > been doing it wrong all these years. > > > > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html > > > > It is common knowledge that a radius reduces the chance for a stress crack > > by ditributing the stresses evenly across the radius. The bigger the > radius, > > the more area to absorbs stresses. > > > > Chris > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com... > > > It's called a bearing knife or bearing scraper: > > > > > > But, if you have an excessively large fillet radius, especially in a > cast > > > iron crankshaft. that is the perfect place for a radial crack to begin. > > > > > > The fillet radius should be ground with the stone dressed to the propper > > > radius for the crankshaft in the machine. > > > > > > Refinish King > > > > > > > > > "HLS" <Sorry@nospam> wrote in message > > > news:10719qskrk8ad4f@corp.supernews.com... > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com... > > > > > If they did that: > > > > > > > > > > They're asking for a crack to happen. Read the manual, for every > > crank, > > > > > there is a specified fillet radius! > > > > > > > > > > Refinish King > > > > > > > > A radiused fillet is less likely to crack than a sharply ground one, > re > > > the > > > > stress raiser > > > > phenomenon we have discussed before.. I think that more often than > not, > > > the > > > > fillet > > > > is not intented to be left overly large...it is probably a result of > > less > > > > than precise machining. > > > > > > > > It can interfere with the edge of the bearing, just as "c" said. > > > > > > > > I never heard of anyone using narrower bearings, but they do 'relieve' > > the > > > > edge of the > > > > bearing where it might contact the fillet. > > > > > > > > Seems I have seen a special tool to do this, but don't have one > myself. > > > > > > > > > > > > > > > > > > > > > > > > |
Re: how "tight" should the crankshaft be with new bearings?
Do you want me to use the book that I used for the 4 years that I worked in
a racing engine shop, or do you have a specific one in mind? Chris "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com... > That's on new: > > not a regrind. > > So like I said, go look in the book that crankshaft grinders use. You'll be > surprised, and more surprised at what they use for gauges to check the > stones when they dress them. > > Refinish King > > > "c" <c@me.org> wrote in message > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com... > > I guess Lunati and all of the other aftermarket crank manufacturers have > > been doing it wrong all these years. > > > > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html > > > > It is common knowledge that a radius reduces the chance for a stress crack > > by ditributing the stresses evenly across the radius. The bigger the > radius, > > the more area to absorbs stresses. > > > > Chris > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com... > > > It's called a bearing knife or bearing scraper: > > > > > > But, if you have an excessively large fillet radius, especially in a > cast > > > iron crankshaft. that is the perfect place for a radial crack to begin. > > > > > > The fillet radius should be ground with the stone dressed to the propper > > > radius for the crankshaft in the machine. > > > > > > Refinish King > > > > > > > > > "HLS" <Sorry@nospam> wrote in message > > > news:10719qskrk8ad4f@corp.supernews.com... > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com... > > > > > If they did that: > > > > > > > > > > They're asking for a crack to happen. Read the manual, for every > > crank, > > > > > there is a specified fillet radius! > > > > > > > > > > Refinish King > > > > > > > > A radiused fillet is less likely to crack than a sharply ground one, > re > > > the > > > > stress raiser > > > > phenomenon we have discussed before.. I think that more often than > not, > > > the > > > > fillet > > > > is not intented to be left overly large...it is probably a result of > > less > > > > than precise machining. > > > > > > > > It can interfere with the edge of the bearing, just as "c" said. > > > > > > > > I never heard of anyone using narrower bearings, but they do 'relieve' > > the > > > > edge of the > > > > bearing where it might contact the fillet. > > > > > > > > Seems I have seen a special tool to do this, but don't have one > myself. > > > > > > > > > > > > > > > > > > > > > > > > |
Re: how "tight" should the crankshaft be with new bearings?
APRA Crankshaft specifications and tolerances!
Racing engine shops use different tollerances, I've been there! Refinish King "c" <c@me.org> wrote in message news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com... > Do you want me to use the book that I used for the 4 years that I worked in > a racing engine shop, or do you have a specific one in mind? > > Chris > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com... > > That's on new: > > > > not a regrind. > > > > So like I said, go look in the book that crankshaft grinders use. You'll > be > > surprised, and more surprised at what they use for gauges to check the > > stones when they dress them. > > > > Refinish King > > > > > > "c" <c@me.org> wrote in message > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com... > > > I guess Lunati and all of the other aftermarket crank manufacturers have > > > been doing it wrong all these years. > > > > > > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html > > > > > > It is common knowledge that a radius reduces the chance for a stress > crack > > > by ditributing the stresses evenly across the radius. The bigger the > > radius, > > > the more area to absorbs stresses. > > > > > > Chris > > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com... > > > > It's called a bearing knife or bearing scraper: > > > > > > > > But, if you have an excessively large fillet radius, especially in a > > cast > > > > iron crankshaft. that is the perfect place for a radial crack to > begin. > > > > > > > > The fillet radius should be ground with the stone dressed to the > propper > > > > radius for the crankshaft in the machine. > > > > > > > > Refinish King > > > > > > > > > > > > "HLS" <Sorry@nospam> wrote in message > > > > news:10719qskrk8ad4f@corp.supernews.com... > > > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote > in > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com... > > > > > > If they did that: > > > > > > > > > > > > They're asking for a crack to happen. Read the manual, for every > > > crank, > > > > > > there is a specified fillet radius! > > > > > > > > > > > > Refinish King > > > > > > > > > > A radiused fillet is less likely to crack than a sharply ground one, > > re > > > > the > > > > > stress raiser > > > > > phenomenon we have discussed before.. I think that more often than > > not, > > > > the > > > > > fillet > > > > > is not intented to be left overly large...it is probably a result of > > > less > > > > > than precise machining. > > > > > > > > > > It can interfere with the edge of the bearing, just as "c" said. > > > > > > > > > > I never heard of anyone using narrower bearings, but they do > 'relieve' > > > the > > > > > edge of the > > > > > bearing where it might contact the fillet. > > > > > > > > > > Seems I have seen a special tool to do this, but don't have one > > myself. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
Re: how "tight" should the crankshaft be with new bearings?
APRA Crankshaft specifications and tolerances!
Racing engine shops use different tollerances, I've been there! Refinish King "c" <c@me.org> wrote in message news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com... > Do you want me to use the book that I used for the 4 years that I worked in > a racing engine shop, or do you have a specific one in mind? > > Chris > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com... > > That's on new: > > > > not a regrind. > > > > So like I said, go look in the book that crankshaft grinders use. You'll > be > > surprised, and more surprised at what they use for gauges to check the > > stones when they dress them. > > > > Refinish King > > > > > > "c" <c@me.org> wrote in message > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com... > > > I guess Lunati and all of the other aftermarket crank manufacturers have > > > been doing it wrong all these years. > > > > > > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html > > > > > > It is common knowledge that a radius reduces the chance for a stress > crack > > > by ditributing the stresses evenly across the radius. The bigger the > > radius, > > > the more area to absorbs stresses. > > > > > > Chris > > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com... > > > > It's called a bearing knife or bearing scraper: > > > > > > > > But, if you have an excessively large fillet radius, especially in a > > cast > > > > iron crankshaft. that is the perfect place for a radial crack to > begin. > > > > > > > > The fillet radius should be ground with the stone dressed to the > propper > > > > radius for the crankshaft in the machine. > > > > > > > > Refinish King > > > > > > > > > > > > "HLS" <Sorry@nospam> wrote in message > > > > news:10719qskrk8ad4f@corp.supernews.com... > > > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote > in > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com... > > > > > > If they did that: > > > > > > > > > > > > They're asking for a crack to happen. Read the manual, for every > > > crank, > > > > > > there is a specified fillet radius! > > > > > > > > > > > > Refinish King > > > > > > > > > > A radiused fillet is less likely to crack than a sharply ground one, > > re > > > > the > > > > > stress raiser > > > > > phenomenon we have discussed before.. I think that more often than > > not, > > > > the > > > > > fillet > > > > > is not intented to be left overly large...it is probably a result of > > > less > > > > > than precise machining. > > > > > > > > > > It can interfere with the edge of the bearing, just as "c" said. > > > > > > > > > > I never heard of anyone using narrower bearings, but they do > 'relieve' > > > the > > > > > edge of the > > > > > bearing where it might contact the fillet. > > > > > > > > > > Seems I have seen a special tool to do this, but don't have one > > myself. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
Re: how "tight" should the crankshaft be with new bearings?
APRA Crankshaft specifications and tolerances!
Racing engine shops use different tollerances, I've been there! Refinish King "c" <c@me.org> wrote in message news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com... > Do you want me to use the book that I used for the 4 years that I worked in > a racing engine shop, or do you have a specific one in mind? > > Chris > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com... > > That's on new: > > > > not a regrind. > > > > So like I said, go look in the book that crankshaft grinders use. You'll > be > > surprised, and more surprised at what they use for gauges to check the > > stones when they dress them. > > > > Refinish King > > > > > > "c" <c@me.org> wrote in message > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com... > > > I guess Lunati and all of the other aftermarket crank manufacturers have > > > been doing it wrong all these years. > > > > > > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html > > > > > > It is common knowledge that a radius reduces the chance for a stress > crack > > > by ditributing the stresses evenly across the radius. The bigger the > > radius, > > > the more area to absorbs stresses. > > > > > > Chris > > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com... > > > > It's called a bearing knife or bearing scraper: > > > > > > > > But, if you have an excessively large fillet radius, especially in a > > cast > > > > iron crankshaft. that is the perfect place for a radial crack to > begin. > > > > > > > > The fillet radius should be ground with the stone dressed to the > propper > > > > radius for the crankshaft in the machine. > > > > > > > > Refinish King > > > > > > > > > > > > "HLS" <Sorry@nospam> wrote in message > > > > news:10719qskrk8ad4f@corp.supernews.com... > > > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote > in > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com... > > > > > > If they did that: > > > > > > > > > > > > They're asking for a crack to happen. Read the manual, for every > > > crank, > > > > > > there is a specified fillet radius! > > > > > > > > > > > > Refinish King > > > > > > > > > > A radiused fillet is less likely to crack than a sharply ground one, > > re > > > > the > > > > > stress raiser > > > > > phenomenon we have discussed before.. I think that more often than > > not, > > > > the > > > > > fillet > > > > > is not intented to be left overly large...it is probably a result of > > > less > > > > > than precise machining. > > > > > > > > > > It can interfere with the edge of the bearing, just as "c" said. > > > > > > > > > > I never heard of anyone using narrower bearings, but they do > 'relieve' > > > the > > > > > edge of the > > > > > bearing where it might contact the fillet. > > > > > > > > > > Seems I have seen a special tool to do this, but don't have one > > myself. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
Re: how "tight" should the crankshaft be with new bearings?
APRA Crankshaft specifications and tolerances!
Racing engine shops use different tollerances, I've been there! Refinish King "c" <c@me.org> wrote in message news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com... > Do you want me to use the book that I used for the 4 years that I worked in > a racing engine shop, or do you have a specific one in mind? > > Chris > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com... > > That's on new: > > > > not a regrind. > > > > So like I said, go look in the book that crankshaft grinders use. You'll > be > > surprised, and more surprised at what they use for gauges to check the > > stones when they dress them. > > > > Refinish King > > > > > > "c" <c@me.org> wrote in message > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com... > > > I guess Lunati and all of the other aftermarket crank manufacturers have > > > been doing it wrong all these years. > > > > > > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html > > > > > > It is common knowledge that a radius reduces the chance for a stress > crack > > > by ditributing the stresses evenly across the radius. The bigger the > > radius, > > > the more area to absorbs stresses. > > > > > > Chris > > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com... > > > > It's called a bearing knife or bearing scraper: > > > > > > > > But, if you have an excessively large fillet radius, especially in a > > cast > > > > iron crankshaft. that is the perfect place for a radial crack to > begin. > > > > > > > > The fillet radius should be ground with the stone dressed to the > propper > > > > radius for the crankshaft in the machine. > > > > > > > > Refinish King > > > > > > > > > > > > "HLS" <Sorry@nospam> wrote in message > > > > news:10719qskrk8ad4f@corp.supernews.com... > > > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote > in > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com... > > > > > > If they did that: > > > > > > > > > > > > They're asking for a crack to happen. Read the manual, for every > > > crank, > > > > > > there is a specified fillet radius! > > > > > > > > > > > > Refinish King > > > > > > > > > > A radiused fillet is less likely to crack than a sharply ground one, > > re > > > > the > > > > > stress raiser > > > > > phenomenon we have discussed before.. I think that more often than > > not, > > > > the > > > > > fillet > > > > > is not intented to be left overly large...it is probably a result of > > > less > > > > > than precise machining. > > > > > > > > > > It can interfere with the edge of the bearing, just as "c" said. > > > > > > > > > > I never heard of anyone using narrower bearings, but they do > 'relieve' > > > the > > > > > edge of the > > > > > bearing where it might contact the fillet. > > > > > > > > > > Seems I have seen a special tool to do this, but don't have one > > myself. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
Re: how "tight" should the crankshaft be with new bearings?
Yeah they do, but you are dead wrong as to why they do it. It has nothing to
do with a small fillet increasing strength, it has to do with providing clearance for the sides of the bearings. It is common sense (maybe this is why you don't get it?) that a larger fillet increases strength. 'nuff said. Chris "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in message news:Y3gcc.5641$Em4.3205@fe03.usenetserver.com... > APRA Crankshaft specifications and tolerances! > > Racing engine shops use different tollerances, I've been there! > > Refinish King > > > "c" <c@me.org> wrote in message > news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com... > > Do you want me to use the book that I used for the 4 years that I worked > in > > a racing engine shop, or do you have a specific one in mind? > > > > Chris > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com... > > > That's on new: > > > > > > not a regrind. > > > > > > So like I said, go look in the book that crankshaft grinders use. You'll > > be > > > surprised, and more surprised at what they use for gauges to check the > > > stones when they dress them. > > > > > > Refinish King > > > > > > > > > "c" <c@me.org> wrote in message > > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com... > > > > I guess Lunati and all of the other aftermarket crank manufacturers > have > > > > been doing it wrong all these years. > > > > > > > > > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html > > > > > > > > It is common knowledge that a radius reduces the chance for a stress > > crack > > > > by ditributing the stresses evenly across the radius. The bigger the > > > radius, > > > > the more area to absorbs stresses. > > > > > > > > Chris > > > > > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com... > > > > > It's called a bearing knife or bearing scraper: > > > > > > > > > > But, if you have an excessively large fillet radius, especially in a > > > cast > > > > > iron crankshaft. that is the perfect place for a radial crack to > > begin. > > > > > > > > > > The fillet radius should be ground with the stone dressed to the > > propper > > > > > radius for the crankshaft in the machine. > > > > > > > > > > Refinish King > > > > > > > > > > > > > > > "HLS" <Sorry@nospam> wrote in message > > > > > news:10719qskrk8ad4f@corp.supernews.com... > > > > > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote > > in > > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com... > > > > > > > If they did that: > > > > > > > > > > > > > > They're asking for a crack to happen. Read the manual, for every > > > > crank, > > > > > > > there is a specified fillet radius! > > > > > > > > > > > > > > Refinish King > > > > > > > > > > > > A radiused fillet is less likely to crack than a sharply ground > one, > > > re > > > > > the > > > > > > stress raiser > > > > > > phenomenon we have discussed before.. I think that more often > than > > > not, > > > > > the > > > > > > fillet > > > > > > is not intented to be left overly large...it is probably a result > of > > > > less > > > > > > than precise machining. > > > > > > > > > > > > It can interfere with the edge of the bearing, just as "c" said. > > > > > > > > > > > > I never heard of anyone using narrower bearings, but they do > > 'relieve' > > > > the > > > > > > edge of the > > > > > > bearing where it might contact the fillet. > > > > > > > > > > > > Seems I have seen a special tool to do this, but don't have one > > > myself. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
Re: how "tight" should the crankshaft be with new bearings?
Yeah they do, but you are dead wrong as to why they do it. It has nothing to
do with a small fillet increasing strength, it has to do with providing clearance for the sides of the bearings. It is common sense (maybe this is why you don't get it?) that a larger fillet increases strength. 'nuff said. Chris "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in message news:Y3gcc.5641$Em4.3205@fe03.usenetserver.com... > APRA Crankshaft specifications and tolerances! > > Racing engine shops use different tollerances, I've been there! > > Refinish King > > > "c" <c@me.org> wrote in message > news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com... > > Do you want me to use the book that I used for the 4 years that I worked > in > > a racing engine shop, or do you have a specific one in mind? > > > > Chris > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com... > > > That's on new: > > > > > > not a regrind. > > > > > > So like I said, go look in the book that crankshaft grinders use. You'll > > be > > > surprised, and more surprised at what they use for gauges to check the > > > stones when they dress them. > > > > > > Refinish King > > > > > > > > > "c" <c@me.org> wrote in message > > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com... > > > > I guess Lunati and all of the other aftermarket crank manufacturers > have > > > > been doing it wrong all these years. > > > > > > > > > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html > > > > > > > > It is common knowledge that a radius reduces the chance for a stress > > crack > > > > by ditributing the stresses evenly across the radius. The bigger the > > > radius, > > > > the more area to absorbs stresses. > > > > > > > > Chris > > > > > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com... > > > > > It's called a bearing knife or bearing scraper: > > > > > > > > > > But, if you have an excessively large fillet radius, especially in a > > > cast > > > > > iron crankshaft. that is the perfect place for a radial crack to > > begin. > > > > > > > > > > The fillet radius should be ground with the stone dressed to the > > propper > > > > > radius for the crankshaft in the machine. > > > > > > > > > > Refinish King > > > > > > > > > > > > > > > "HLS" <Sorry@nospam> wrote in message > > > > > news:10719qskrk8ad4f@corp.supernews.com... > > > > > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote > > in > > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com... > > > > > > > If they did that: > > > > > > > > > > > > > > They're asking for a crack to happen. Read the manual, for every > > > > crank, > > > > > > > there is a specified fillet radius! > > > > > > > > > > > > > > Refinish King > > > > > > > > > > > > A radiused fillet is less likely to crack than a sharply ground > one, > > > re > > > > > the > > > > > > stress raiser > > > > > > phenomenon we have discussed before.. I think that more often > than > > > not, > > > > > the > > > > > > fillet > > > > > > is not intented to be left overly large...it is probably a result > of > > > > less > > > > > > than precise machining. > > > > > > > > > > > > It can interfere with the edge of the bearing, just as "c" said. > > > > > > > > > > > > I never heard of anyone using narrower bearings, but they do > > 'relieve' > > > > the > > > > > > edge of the > > > > > > bearing where it might contact the fillet. > > > > > > > > > > > > Seems I have seen a special tool to do this, but don't have one > > > myself. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
Re: how "tight" should the crankshaft be with new bearings?
Yeah they do, but you are dead wrong as to why they do it. It has nothing to
do with a small fillet increasing strength, it has to do with providing clearance for the sides of the bearings. It is common sense (maybe this is why you don't get it?) that a larger fillet increases strength. 'nuff said. Chris "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in message news:Y3gcc.5641$Em4.3205@fe03.usenetserver.com... > APRA Crankshaft specifications and tolerances! > > Racing engine shops use different tollerances, I've been there! > > Refinish King > > > "c" <c@me.org> wrote in message > news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com... > > Do you want me to use the book that I used for the 4 years that I worked > in > > a racing engine shop, or do you have a specific one in mind? > > > > Chris > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com... > > > That's on new: > > > > > > not a regrind. > > > > > > So like I said, go look in the book that crankshaft grinders use. You'll > > be > > > surprised, and more surprised at what they use for gauges to check the > > > stones when they dress them. > > > > > > Refinish King > > > > > > > > > "c" <c@me.org> wrote in message > > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com... > > > > I guess Lunati and all of the other aftermarket crank manufacturers > have > > > > been doing it wrong all these years. > > > > > > > > > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html > > > > > > > > It is common knowledge that a radius reduces the chance for a stress > > crack > > > > by ditributing the stresses evenly across the radius. The bigger the > > > radius, > > > > the more area to absorbs stresses. > > > > > > > > Chris > > > > > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in > > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com... > > > > > It's called a bearing knife or bearing scraper: > > > > > > > > > > But, if you have an excessively large fillet radius, especially in a > > > cast > > > > > iron crankshaft. that is the perfect place for a radial crack to > > begin. > > > > > > > > > > The fillet radius should be ground with the stone dressed to the > > propper > > > > > radius for the crankshaft in the machine. > > > > > > > > > > Refinish King > > > > > > > > > > > > > > > "HLS" <Sorry@nospam> wrote in message > > > > > news:10719qskrk8ad4f@corp.supernews.com... > > > > > > > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote > > in > > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com... > > > > > > > If they did that: > > > > > > > > > > > > > > They're asking for a crack to happen. Read the manual, for every > > > > crank, > > > > > > > there is a specified fillet radius! > > > > > > > > > > > > > > Refinish King > > > > > > > > > > > > A radiused fillet is less likely to crack than a sharply ground > one, > > > re > > > > > the > > > > > > stress raiser > > > > > > phenomenon we have discussed before.. I think that more often > than > > > not, > > > > > the > > > > > > fillet > > > > > > is not intented to be left overly large...it is probably a result > of > > > > less > > > > > > than precise machining. > > > > > > > > > > > > It can interfere with the edge of the bearing, just as "c" said. > > > > > > > > > > > > I never heard of anyone using narrower bearings, but they do > > 'relieve' > > > > the > > > > > > edge of the > > > > > > bearing where it might contact the fillet. > > > > > > > > > > > > Seems I have seen a special tool to do this, but don't have one > > > myself. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
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