Are they all .70 reliefs? They were deep enough to clear my cam with .5xx+ lift and 270+ duration
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CP Carrillo Pistons
- Thread starter Cknight199
- Start date
Most piston companies will make a custom design for a little extra $$. You get your own Part # too
I was told a few companies to stay away from while doing this though, because of theft of your ideas.That cam duration isn't the real number you should like at for the duration spec for determining valve clearance. 270 plus would be overall duration. There is duration under .050 that doesn't effect determining clearance at all. At .050 you are probably less than 220 degree duration. Valve timing events determine if that much of a relief will be enough. When the valve opens and closes and at what degree of crank rotation. .075 reliefs handle 95 percent if all the cams out there. I actually run .100 reliefs.
My duration for .50 is 217 intake and 225 exhaust
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Somewhere around there
Ended up being too big, stepping down a size
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Most piston companies will make a custom design for a little extra $$. You get your own Part # too
No doubt. I think piston manufacturers should spend a little more time researching bowl design. What works for emissions is nowhere near ideal for maximum performance. Injector spray angle/hole size/hole count all play a role in bowl width, depth and volume.
Agreed sir. I'm a fan of the Aries/diamond wide bowl design and subsequent changes thereto.
I remember a few years ago when forged pistons were the next big thing there was talk about not running them in daily driver motors due to premature ring wear. They beat the ringlands up... is this still the case?
Unless someone has come up with some supersonic aluminum that is stronger than steel, yes that is still the case.