piston info

[02ilduramax]

i am still up in the air about what pistons to run weather cast or forged really thinking fingers oval bowls but I am curious if anyone has the weight of each piston the truck will be strictly a track truck and in a light chassis with twins and probably on some spray

 

[S Phinney]

I'm not 100 percent but there is a very significant weight difference in cast and good forged. We are talking 100 plus grams.

 

[malibu795]

I'm not 100 percent but there is a very significant weight difference in cast and good forged. We are talking 100 plus grams.

Only thing that would change is how fast you can rev the engine.. Heavier the rotating assembly more HP is needed to accelerate said assembly. In turn means less available HP to accelerate down the track

 

[Ne-max]

Lots of things to consider. Biggest thing is future hp goal and how much you drive it. They compression ratio and valve reliefs will be your next.

 

[Mikey]

Still have not heard of any oval bowl cast pistons break yet

 

[Burn Down]

Track only truck, with twins and nitrous, hard to not pick Arias forged. So far so good with Fingers pistons but for a race vehicle only I would have to stick with Arias. Anything that was driven on the street would get Ovals. jmop.

 

[colorado.dmax]

What about forged oval bowls?

 

[S Phinney]

Looking back at a couple Bob weight cards I see that my forged Arias pistons lighten up the reciprocating weight by about a half pound.

 

[Yellow Jacket]

Looking back at a couple Bob weight cards I see that my forged Arias pistons lighten up the reciprocating weight by about a half pound.

:thumb:

Race only application I would use Arias or maybe the newer Diamond Billets....but Arias are less $$ I believe, I'm not sure on weights of those 2 in comparison to each other though...

 

[S Phinney]

Some diamonds depending on bore size are about 20 grams lighter

 

[02ilduramax]

I know piston weight has an effect on crankshaft vibrations does anyone know if there is a correlation between Duramax crankshafts breaking and piston weight?

 

[02ilduramax]

I guess my best thing to do would be to call the piston manufacturer and ask for specs on their pistons I sometimes think I'm overthinking my options for a rotating assembly and I will be balancing it myself in class at the school of automotive machinist

 

[S Phinney]

A lighter reciprocating mass is easier on balancing since there really isn't enough counterweight on the crank as it is now. Rotating weight helps with harmonics. Reciprocating helps with balancing.

 

[Fingers]

I am, of coarse, biased.

The cast ovals have been holding up wonderfully in race applications and I have been recommending them to anyone that doesn't need stupid low compression. They don't suffer the blow-by that the forged do and have the oil gallery for cooling.

There is a slight weight penalty, but then again, the ovals are available in forged if you really want to go that way.

 

[02ilduramax]

How much of a weight penalty? What does an oval bowl weight for say a 20 over piston

 

[Fingers]

You need to compare apples to apples. That is, you need to compare the same chamber size, compression height and bore for it to be meaningful. Just telling you a weight doesn't mean much.

 

[Mikey]

My brother works for Ross and they make Pistons that work with a lighter top fuel pin and aluminum rods


Sent from my iPhone using Tapatalk

 

[02ilduramax]

so im thinking im going to go with arias with a lower c/r just still cant decide 100 percent everyone I talk to says something different I just want to build it right the first time