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#88: 03-10-2013, 10:14 PM
 
 BlackHole
Title: Mad Scientist
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Location: Plainfield, IL
Car: 05 LGT RBP 6MT wagon project
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Quote:
Originally Posted by F1inspiredLGT View Post
Does all forged pistons slap on start up, or is it just a few that do?
Not all forged piston motors slap. It depends on the piston pin offset, piston material and piston-to-wall clearance used by the builder.

Quote:
Originally Posted by F1inspiredLGT View Post
That's what I thought. Just wanting a reliable motor that will last me another 100k without major oil consumption, and make the step up to Stage 2 in the near future.
Then stick to the lower expansion 4032 pistons (Mahle, Wossner, Cosworth) and pick a builder who is used to setting the clearances appropriate to your use. For reliability, blueprint the bearing clearances. Subaru doesn't do a great job in making them consistent from the factory which will affect the oiling, especially on the #2 & 3 rods which are fed by the same main bearing. I have 5 blocks sitting here, all of whom failed on either the #2 or 3 rod.
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Last edited by BlackHole; 03-10-2013 at 10:24 PM..
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F1inspiredLGT (03-11-2013)