2.4L Pistons

[Shane@DBPerformance]

Dome? We don't use domes.

[Raptor]

Not a dome, I mis typed, the crown. Use Coates valves and you could use a dome ;)

[Shane@DBPerformance]

Domes suck for detonation resistance though anyways.

[Raptor]

I was kidding on that of course. DSMers can't afford Coates setups anyway. Hey, don't you have a few more games to dominate or something?

[Goat Blower]

I'd be interested in seeing dyno sheets of this 20hp difference myself. Please tell me this aren't Endyn rollerwaves.

[Raptor]

Oh not even close. I will see what I can do to get the dyno sheets. It may not be too difficult. It is from someone I trust and they have no reason to exagerate this. Much of the power increase comes from the lack of ring friction. They don't require latteral gas porting and still are able to run very light tension rings with good seal. The shop in question tests the motors the same way I do(in addition to the dyno testing), with a torque meter after bare crank install and after each piston install which shows the amount of torque required to rotate the assembly. With these pistons/rings, the torque required was cut to less than half. I have noticed definate differences between different ring materials even on the same piston. EG the chrome rings VS plasma molly on the Wisecos, final rotating torque requirement was decreased by almost 50 inch lbs (a little more than 4 ft lbs) exactly on the 3 engines that wiseco decided to send the pistons with the chromes. (another reason I don't like wiseco - if you don't specifically ask, you never know what rings will end up in the box)

Maybe your butt dyno won't be able to tell, but at the track, I will take every advantage I can. If it is 2HP, so be it, 20, better yet. It all adds up. I will see what I can do to score the dyno sheets. If you want more detail, call me. I don't believe internet hype any more than anyone else, All of my research always includes a million questions to engineers, as many references from sources I trust as well as a ton of testing. In this case, a ton of testing has been done (by other than the piston manufacturer) by a source I have complete faith in and I will still do my own testing.

[sleepydsm]

I'm stopping by QPR.

[Raptor]

I wanted to mention something else now that I think about it. The Wisecos are decent other than the divits in the top and part numbers, the machining is very accurate and the price is decent. The Divits and their customer service is why I no longer use them. For the customers of the 20 engines we have used Wisecos in this year, there good pistons, the divit thing is a new addition they just started doing recently. The fact that the new pistons we are going to are a better design is one of the main reasons we are switching.