Who has Shelf Pistons with pin offset for strokers
12-10-2009, 10:42 PM
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Who has Shelf Pistons with pin offset for strokers I have heard a Ton on Guys building stroker Ls's only to have Pistons knocking from either loose p-wall clearance or no piston pin offset, I have heard adding this pin offset helps with piston rock by reducing rod angularity at BDC and really quiets them up from what i'm told, I am ready to buy pistons for my 383 iron block stroker and can't afford to do this twice LOL so who has the best on the shelf piston with offest, Or even better what are you guys having good luck with, i know all basic 2618 pistons seem similer but there are major differences and it seems some put more thought into these than others, any thoughts?
12-11-2009, 05:06 AM
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Wiseco and Diamond both stock pistons with pin offset for the LS series, I have used both with great results.
Kurt
Kurt
I have heard a Ton on Guys building stroker Ls's only to have Pistons knocking from either loose p-wall clearance or no piston pin offset, I have heard adding this pin offset helps with piston rock by reducing rod angularity at BDC and really quiets them up from what i'm told, I am ready to buy pistons for my 383 iron block stroker and can't afford to do this twice LOL so who has the best on the shelf piston with offest, Or even better what are you guys having good luck with, i know all basic 2618 pistons seem similer but there are major differences and it seems some put more thought into these than others, any thoughts?
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12-14-2009, 01:14 PM
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Also, the reduction of piston slap actually occurs at tdc. When dead cold, the piston's top land is roughly .054 smaller than the bore (rather than .0035 at the bottom of the skirt) with a Wiseco (all 2618). When the rod goes over tdc, the piston reacts by switching directions and the top land moves from one side of the cylinder to the other abruptly-causing it to bang the cylinder. By offseting the pin by a small amount, the piston skirt is loaded (also a small amount) and the piston "rolls" up it's skirt taper curve which cushions the top land movement.
