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Registered
Join Date: Oct 1999
Location: Marietta, GA
Posts: 809
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Oversized case bearings
I started checking clearances on my new racing engine and to my surprise the main bearings seem to have about 0.010" of clearance. I remiked the crank and it was within spec. Measured the case to find out it has been oversized (62.250mm).
I guess the guy that sold me the case forgot to mention this detail. So now I am in a quandry. I have searched the forum and Henry wrote the oversize bearings are no longer available even at the exhorbinate price. I have another case (call it case B), but I have a lot of machine work in this case A and case B doesn't have piston squirters. I do not know how straight the mains are in case B. During my search I came accross cgarr's post about using steel sleeves on the through bolts to help stabilise the case. I like that idea. It would require the cases to be machined on the centerline and the mains rebored, this time back to 62mm. the intermediate shaft and main seal bores would also need to be remachined. A lot of work but I would have a better bottom end for it. All that being said now to the reason for the post. Does a 2.2 street engine have the same problem with oval main caps as the 2.7 engines. What is the probability that case B will need to be machined? Any new information on the oversize bearings fom Porsche? I should mention the number 8 bearing is overbored also. What would you do? |
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Registered
Join Date: Oct 2003
Location: Central Fla
Posts: 1,864
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brgs
Neil, I may have a new set of O/S mains with std. crank dimensions for a 2.7 case, I can check on monday
Mike Bruns
__________________
The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago. |
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Registered
Join Date: Oct 1999
Location: Marietta, GA
Posts: 809
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Thanks Mike that would open up an option. This is a 3R case so the 2.7 would work.
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Registered
Join Date: Jan 2011
Location: Gulf Coast FL
Posts: 1,485
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Just bought a set of .25 oversize main bearings at Carlsen Porsche in Palo Alto, CA. They had them in stock, great guys.
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Registered
Join Date: Oct 1999
Location: Marietta, GA
Posts: 809
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eastbay,
How much were they? |
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Registered
Join Date: Jan 2011
Location: Gulf Coast FL
Posts: 1,485
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I think they were ~ $650-$700
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