Re: Engine backfire
A bad valve does give an inconstant back pressure sound that
reminds me of an old Crist Craft motor boat. God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ Will Honea wrote: > > Just wondering - wouldn't the old test of hanging a shop cloth over > the end of the tailpipe pretty well identify a possible valve problem? > Hold it so it hangs straight over the end of the pipe. It will blow > out, maybe falling back to touch the pipe, unless you have an actual > exhaust valve problem which will try and suck it up the pipe when that > cylinder is in the right position. That will cause a backfire, BTW, > and it can be pretty hard to spot if it's a weak valve spring. |
Re: Engine backfire
A bad valve does give an inconstant back pressure sound that
reminds me of an old Crist Craft motor boat. God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ Will Honea wrote: > > Just wondering - wouldn't the old test of hanging a shop cloth over > the end of the tailpipe pretty well identify a possible valve problem? > Hold it so it hangs straight over the end of the pipe. It will blow > out, maybe falling back to touch the pipe, unless you have an actual > exhaust valve problem which will try and suck it up the pipe when that > cylinder is in the right position. That will cause a backfire, BTW, > and it can be pretty hard to spot if it's a weak valve spring. |
Re: Engine backfire
A bad valve does give an inconstant back pressure sound that
reminds me of an old Crist Craft motor boat. God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ Will Honea wrote: > > Just wondering - wouldn't the old test of hanging a shop cloth over > the end of the tailpipe pretty well identify a possible valve problem? > Hold it so it hangs straight over the end of the pipe. It will blow > out, maybe falling back to touch the pipe, unless you have an actual > exhaust valve problem which will try and suck it up the pipe when that > cylinder is in the right position. That will cause a backfire, BTW, > and it can be pretty hard to spot if it's a weak valve spring. |
Re: Engine backfire
A crack in the exhaust system will be less likely to be found after
the metals have expanded with heat. You don't need a stethoscope, you could put your hear directly on the manifolds if you like. God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ "ezeppelin@msn.com" wrote: > > > Make yourself a stethoscope and see if you can find it cold. > > Not sure I follow. If by "cold" you mean with the engine not > running... there wouldn't be any sound anywhere in the system... so > I'm not sure how I would find the leak with a stethoscope? |
Re: Engine backfire
A crack in the exhaust system will be less likely to be found after
the metals have expanded with heat. You don't need a stethoscope, you could put your hear directly on the manifolds if you like. God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ "ezeppelin@msn.com" wrote: > > > Make yourself a stethoscope and see if you can find it cold. > > Not sure I follow. If by "cold" you mean with the engine not > running... there wouldn't be any sound anywhere in the system... so > I'm not sure how I would find the leak with a stethoscope? |
Re: Engine backfire
A crack in the exhaust system will be less likely to be found after
the metals have expanded with heat. You don't need a stethoscope, you could put your hear directly on the manifolds if you like. God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ "ezeppelin@msn.com" wrote: > > > Make yourself a stethoscope and see if you can find it cold. > > Not sure I follow. If by "cold" you mean with the engine not > running... there wouldn't be any sound anywhere in the system... so > I'm not sure how I would find the leak with a stethoscope? |
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