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Old 09-27-2010, 10:52 PM   #1
Aceyduce
Scooby Specialist
 
Member#: 194449
Join Date: Nov 2008
Chapter/Region: NESIC
Location: Western RI
Vehicle:
2011 Mazda, 2003 WRX
Black , WRB

Default Reduced Piston to Wall Clearances

I've been doing as much research as I can on this topic, but I've hit my limit of knowledge. After asking a few sources for opinions, I figured I'd open up the flood gates on my not so new idea.

Shortly I'll begin the process of building my 08's 257 using CP pistons. I understand that the recommended tolerance for piston to wall is 0.0030". Would reducing that tolerance to 0.0028" provide an added benefit that will not be outweighed by other factors? The block will see at most 380-400whp (20g/10cm^2) at the largest turbo. The primary goal of the motor is to be used in a daily driver that averages around 50,000 miles a year, while seeing several tracks days of hard use during that year. (side note- the stock block lasted 78,000 miles for those keeping track of blown 08's)

My thoughts and reasons on reducing the P-W clearance was to reduce the movement of the piston laterally, decreasing the potential for wear on the block itself. This should increase block life at the expense of the rings. What are your opinions and concerns? Am I off my rocker in considering this for my application? In theory it seems sound, but we all know how far theory gets and how much it leaves to be desired. I know there have a been a few users who have done just this and have reported back, to them thank you for the idea, and I hope they can provide further insight.

Thanks.
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