Question about 1995 Subaru Impreza
If you are sure it is piston slap then the only remedy is a rebore and slightly oversized pistons. If your running a lot of power or intend to then you should take the opportunity of getting internals forged. THe best source for this really is Roger Clarke Motorsport. Many forged engines will sound like a bag of nails when idling because of the type of piston used. Most normal pistons upper Small end bearing is slightly offset giving the piston a quiet movement . To increase the strength of the piston to take the extra load increased performance desires the piston small end is places pretty much top dead centre giving the engine a harsher note. Roger Clarke make a piston that overcomes this problem so you get a quiet engine and forged internals.
Hope this helps.
Posted on Mar 22, 2011
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Posted on Jan 02, 2017
SOURCE: like piston slap
in this car piston slap is normal and will not cause any further damage to the engine, almost all LT 1 and LT 5 have this issue as long as it goes away after engine heats up, this comes from a GM service bulletin. and no the oil pump has nothing to do with this, cylinder walls are splashed by oil.
Posted on Nov 04, 2009
Rebuilding the engine is the only true cure. Be sure that the engine warms up without driving it. In other words, don't put any excessive load on the engine while it is cold. Once it warms up, the piston, rings, pins, etc. will expand from the heat. This is why you only hear slapping when the engine is cold.
Posted on May 23, 2010
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