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Author Topic:   balance needed?
posted November 27, 2004 12:39 PM
when replacing stock cast pistons with trw forged pistons ,the 4 valve relief type,pn.L2256f. is it really necessary to rebalance the crank ? this is a stock rod,stock crank 2barrel engine that will see r.p.m of about 6800 max. is their a big difference in the weight of these pistons? thanks.

posted November 27, 2004 03:38 PM
you don't aboslutly have to but balanceing the assenmbly is always a good idea

posted November 28, 2004 02:22 AM
I dont see why it should be a problem. But If you want to just be perfect, go ahead and balance it. Otherwise, just slap it in and go. I know, it sounds like bad advice but from my experience being on a budget, I have never had a problem doing it this way. Like racer17j said, you dont have to but if you want to find that tiny little bit of extra power, go ahead and balance the crank, rods, and pistons. Just depends on how much money you want to spend.

posted November 28, 2004 09:50 AM

Add 1 ounce to the end of one blade on a ceiling fan in your house. Turn the ceiling fan on low, which should run about 100rpm or so. Watch the result. Turn it on high, and watch the result. You will have answered your own question by doing this. Even though this is an extreme example, the same theory applies to your engine. If you like your engine, and value what you already have invested, I would balance it again.


Hendren Racing Engines
Rutherfordton , NC