Re: Does it cause overheating or not???
 

If it was mine I would toss that block in the trash.

I believe all the wear and polished up parts was due to lack of
lubrication because of gas wash. Too much gas in the oil makes thin
oil. Your bearings were textbook for a gas wash or lack of lubrication,
so are the polished cylinders.

So in light of that, all the metal that wore away has to be somewhere
right? Think of all those little oil passages and how many of them are
blocked or partially blocked with the metal particles.

Then to make things even more interesting, you think it is a 0.040
overbore with 0.058 overbore pistons in it?????

I would be checking out the local wreckers for a low mileage used 4.0
out of a Cherokee or newer Wrangler. I got one with 40K on it for
$400.00 Canadian. The full long block. The thing runs beautiful, has
excellent compression, doesn't burn oil and goes like a scalded cat. It
will pull out fast up to 4500 rpm.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

William Oliveri wrote:
>
> Ok, I have been through the mill talking with mechanics, engine shops,
> machine shops, and Hesco regarding this question.
>
> My 258 short block is at .040 over bore. I'm getting ready to take it to a
> guy for a rebuild to get this puppy back on the road. It will be configured
> with the 4.0L head and the Mopar MPI kit at completion.
>
> A lot of you have seen my cylinders posted on the web and note they do not
> have a ring ridge so there is a possibility they may not need a bore to .060
> over but here's the question, if they do:
>
> I have been told by several mechanics that .060 over will cause the engine
> to run hot or hotter than normal.
> I checked with JeepsRUs and they said .060 will be no problem even with the
> 4.0L head
> I checked with Hesco and they said the same, no problem.
> I just talked to a engine remanufacture shop in LA who told me they don't
> send out anything over .030 because it will run hot.
>
> Am I making myself stupid over this? Why is there no consistency with this
> question?
>
> Bottom line, will it run hot with .060 over and degrade the life of the
> engine quicker?
>
> Thanks,

Re: Does it cause overheating or not???
 

If it was mine I would toss that block in the trash.

I believe all the wear and polished up parts was due to lack of
lubrication because of gas wash. Too much gas in the oil makes thin
oil. Your bearings were textbook for a gas wash or lack of lubrication,
so are the polished cylinders.

So in light of that, all the metal that wore away has to be somewhere
right? Think of all those little oil passages and how many of them are
blocked or partially blocked with the metal particles.

Then to make things even more interesting, you think it is a 0.040
overbore with 0.058 overbore pistons in it?????

I would be checking out the local wreckers for a low mileage used 4.0
out of a Cherokee or newer Wrangler. I got one with 40K on it for
$400.00 Canadian. The full long block. The thing runs beautiful, has
excellent compression, doesn't burn oil and goes like a scalded cat. It
will pull out fast up to 4500 rpm.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

William Oliveri wrote:
>
> Ok, I have been through the mill talking with mechanics, engine shops,
> machine shops, and Hesco regarding this question.
>
> My 258 short block is at .040 over bore. I'm getting ready to take it to a
> guy for a rebuild to get this puppy back on the road. It will be configured
> with the 4.0L head and the Mopar MPI kit at completion.
>
> A lot of you have seen my cylinders posted on the web and note they do not
> have a ring ridge so there is a possibility they may not need a bore to .060
> over but here's the question, if they do:
>
> I have been told by several mechanics that .060 over will cause the engine
> to run hot or hotter than normal.
> I checked with JeepsRUs and they said .060 will be no problem even with the
> 4.0L head
> I checked with Hesco and they said the same, no problem.
> I just talked to a engine remanufacture shop in LA who told me they don't
> send out anything over .030 because it will run hot.
>
> Am I making myself stupid over this? Why is there no consistency with this
> question?
>
> Bottom line, will it run hot with .060 over and degrade the life of the
> engine quicker?
>
> Thanks,

Re: Does it cause overheating or not???
 

If it was mine I would toss that block in the trash.

I believe all the wear and polished up parts was due to lack of
lubrication because of gas wash. Too much gas in the oil makes thin
oil. Your bearings were textbook for a gas wash or lack of lubrication,
so are the polished cylinders.

So in light of that, all the metal that wore away has to be somewhere
right? Think of all those little oil passages and how many of them are
blocked or partially blocked with the metal particles.

Then to make things even more interesting, you think it is a 0.040
overbore with 0.058 overbore pistons in it?????

I would be checking out the local wreckers for a low mileage used 4.0
out of a Cherokee or newer Wrangler. I got one with 40K on it for
$400.00 Canadian. The full long block. The thing runs beautiful, has
excellent compression, doesn't burn oil and goes like a scalded cat. It
will pull out fast up to 4500 rpm.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

William Oliveri wrote:
>
> Ok, I have been through the mill talking with mechanics, engine shops,
> machine shops, and Hesco regarding this question.
>
> My 258 short block is at .040 over bore. I'm getting ready to take it to a
> guy for a rebuild to get this puppy back on the road. It will be configured
> with the 4.0L head and the Mopar MPI kit at completion.
>
> A lot of you have seen my cylinders posted on the web and note they do not
> have a ring ridge so there is a possibility they may not need a bore to .060
> over but here's the question, if they do:
>
> I have been told by several mechanics that .060 over will cause the engine
> to run hot or hotter than normal.
> I checked with JeepsRUs and they said .060 will be no problem even with the
> 4.0L head
> I checked with Hesco and they said the same, no problem.
> I just talked to a engine remanufacture shop in LA who told me they don't
> send out anything over .030 because it will run hot.
>
> Am I making myself stupid over this? Why is there no consistency with this
> question?
>
> Bottom line, will it run hot with .060 over and degrade the life of the
> engine quicker?
>
> Thanks,

Re: Does it cause overheating or not???
 

I was just passing on what's happened to me. Sorry I didn't save
any picture for you. Chunks about two inches square would break out of a
couple of my Chevy small blocks, now rather than boring, I just ring,
and hook up my nitrous: http://www.----------.com/pismo.htm
God Bless America, ßill O|||||||O
mailto:--------------------

Steve G wrote:
>
> That Bull. I don't know where you got your info, but if they make as a
> stocking item a .060 piston for that engine and the manufacturer has
> determined it's acceptable the chances of "blowing out a cyl" are 0. Come
> to think of it, in 30 some years making my living at and playing with
> engines I have never seen a thin cyl wall "blow out". As to running hotter,
> if the cooling system is working properly you will never see any difference
> in operating temp and there is no need for concern on anything. The cooling
> system is over designed to accommodate heavy loads on hot days and still
> leave some reserve capacity to cool. You might move slightly into that
> reserve capacity, but I doubt even that.
> Steve

Re: Does it cause overheating or not???
 

I was just passing on what's happened to me. Sorry I didn't save
any picture for you. Chunks about two inches square would break out of a
couple of my Chevy small blocks, now rather than boring, I just ring,
and hook up my nitrous: http://www.----------.com/pismo.htm
God Bless America, ßill O|||||||O
mailto:--------------------

Steve G wrote:
>
> That Bull. I don't know where you got your info, but if they make as a
> stocking item a .060 piston for that engine and the manufacturer has
> determined it's acceptable the chances of "blowing out a cyl" are 0. Come
> to think of it, in 30 some years making my living at and playing with
> engines I have never seen a thin cyl wall "blow out". As to running hotter,
> if the cooling system is working properly you will never see any difference
> in operating temp and there is no need for concern on anything. The cooling
> system is over designed to accommodate heavy loads on hot days and still
> leave some reserve capacity to cool. You might move slightly into that
> reserve capacity, but I doubt even that.
> Steve

Re: Does it cause overheating or not???
 

I was just passing on what's happened to me. Sorry I didn't save
any picture for you. Chunks about two inches square would break out of a
couple of my Chevy small blocks, now rather than boring, I just ring,
and hook up my nitrous: http://www.----------.com/pismo.htm
God Bless America, ßill O|||||||O
mailto:--------------------

Steve G wrote:
>
> That Bull. I don't know where you got your info, but if they make as a
> stocking item a .060 piston for that engine and the manufacturer has
> determined it's acceptable the chances of "blowing out a cyl" are 0. Come
> to think of it, in 30 some years making my living at and playing with
> engines I have never seen a thin cyl wall "blow out". As to running hotter,
> if the cooling system is working properly you will never see any difference
> in operating temp and there is no need for concern on anything. The cooling
> system is over designed to accommodate heavy loads on hot days and still
> leave some reserve capacity to cool. You might move slightly into that
> reserve capacity, but I doubt even that.
> Steve

Re: Does it cause overheating or not???
 

I was just passing on what's happened to me. Sorry I didn't save
any picture for you. Chunks about two inches square would break out of a
couple of my Chevy small blocks, now rather than boring, I just ring,
and hook up my nitrous: http://www.----------.com/pismo.htm
God Bless America, ßill O|||||||O
mailto:--------------------

Steve G wrote:
>
> That Bull. I don't know where you got your info, but if they make as a
> stocking item a .060 piston for that engine and the manufacturer has
> determined it's acceptable the chances of "blowing out a cyl" are 0. Come
> to think of it, in 30 some years making my living at and playing with
> engines I have never seen a thin cyl wall "blow out". As to running hotter,
> if the cooling system is working properly you will never see any difference
> in operating temp and there is no need for concern on anything. The cooling
> system is over designed to accommodate heavy loads on hot days and still
> leave some reserve capacity to cool. You might move slightly into that
> reserve capacity, but I doubt even that.
> Steve

Re: Does it cause overheating or not???
 

The only time I've run a bore that big is when I was cheating for
class.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Mike Romain wrote:
>
> If it was mine I would toss that block in the trash.
>
> I believe all the wear and polished up parts was due to lack of
> lubrication because of gas wash. Too much gas in the oil makes thin
> oil. Your bearings were textbook for a gas wash or lack of lubrication,
> so are the polished cylinders.
>
> So in light of that, all the metal that wore away has to be somewhere
> right? Think of all those little oil passages and how many of them are
> blocked or partially blocked with the metal particles.
>
> Then to make things even more interesting, you think it is a 0.040
> overbore with 0.058 overbore pistons in it?????
>
> I would be checking out the local wreckers for a low mileage used 4.0
> out of a Cherokee or newer Wrangler. I got one with 40K on it for
> $400.00 Canadian. The full long block. The thing runs beautiful, has
> excellent compression, doesn't burn oil and goes like a scalded cat. It
> will pull out fast up to 4500 rpm.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's

Re: Does it cause overheating or not???
 

The only time I've run a bore that big is when I was cheating for
class.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Mike Romain wrote:
>
> If it was mine I would toss that block in the trash.
>
> I believe all the wear and polished up parts was due to lack of
> lubrication because of gas wash. Too much gas in the oil makes thin
> oil. Your bearings were textbook for a gas wash or lack of lubrication,
> so are the polished cylinders.
>
> So in light of that, all the metal that wore away has to be somewhere
> right? Think of all those little oil passages and how many of them are
> blocked or partially blocked with the metal particles.
>
> Then to make things even more interesting, you think it is a 0.040
> overbore with 0.058 overbore pistons in it?????
>
> I would be checking out the local wreckers for a low mileage used 4.0
> out of a Cherokee or newer Wrangler. I got one with 40K on it for
> $400.00 Canadian. The full long block. The thing runs beautiful, has
> excellent compression, doesn't burn oil and goes like a scalded cat. It
> will pull out fast up to 4500 rpm.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's

Re: Does it cause overheating or not???
 

The only time I've run a bore that big is when I was cheating for
class.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Mike Romain wrote:
>
> If it was mine I would toss that block in the trash.
>
> I believe all the wear and polished up parts was due to lack of
> lubrication because of gas wash. Too much gas in the oil makes thin
> oil. Your bearings were textbook for a gas wash or lack of lubrication,
> so are the polished cylinders.
>
> So in light of that, all the metal that wore away has to be somewhere
> right? Think of all those little oil passages and how many of them are
> blocked or partially blocked with the metal particles.
>
> Then to make things even more interesting, you think it is a 0.040
> overbore with 0.058 overbore pistons in it?????
>
> I would be checking out the local wreckers for a low mileage used 4.0
> out of a Cherokee or newer Wrangler. I got one with 40K on it for
> $400.00 Canadian. The full long block. The thing runs beautiful, has
> excellent compression, doesn't burn oil and goes like a scalded cat. It
> will pull out fast up to 4500 rpm.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's