Thread: Piston question (off set pin)
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09-07-2009 04:26 PM #3
CHR Member
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- Aug 2009
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- Car Year, Make, Model: 1984 Inboard Ski boat
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John Lingenfelter: Modifying Small Block Chevy Engines
p. 44-45
Cast pistons are often built with what is called Piston Pin Offset. A typical offset would be .060 inch, where the pin is closer to one side of the piston then the other. This is used to ensure quiet operation, especially during cold start up when the clearances are the greatest. Some Hot Roders using cast pistons will reverse the piston pin offset which will be worth a small amount of power. As you can imagine the pistons will slap around a little when the engine is cold.
Still doesn't give me much. Sounds like I might get some start up clatter if they are offset but they will run and live either way.
How do the masses feel about reversing Cast Pistons?Last edited by Whitfield; 09-07-2009 at 04:53 PM.
UNDERSTEER is when you hit the wall with the front of the car. OVERSTEER is when you hit the wall with the rear. HORSEPOWER is how fast you hit the wall. TORQUE is how far you take the wall with you.
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I'm happy to see it back up, sure hope it lasts.
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