Like the title says, if Mahle were to make FRM compliant pistons for our motors, which compression ratio would you prefer?

 

Why isn't 8.5 an option?

Actually Woessner make a piston which is 8.5 and compatible with FRM. The CR is a tad low but it's what's available so I bought them.

 

9:1. Please!!!!!

 

voted for 9:1... I see 2 votes for 11:1??? who picked that CR and for what reason? lol

 

10.0 would be perfect for me.

 

My vote went towards 9:1. Any info on if Mahle is finally going to listen to the S2K crowd, or if this is just a general interest poll about modified H22 slugs?

 

I voted 11:1 because I would only ever run race gas and sacrificing compression wouldn't do me any good. In all honestly I may run higher.

8.5 is not an option because that's just to low for the characteristics of this engine (particularly cam, head flow and rpm). It just doesn't make sense to mass produce.

... the word is they are listening (to this poll)

 

That would be my preference

 

I voted 9:1.

I don't see the point in 11:1 even if you're only strictly using race gas. Just keep the motor all stock. this piston would only be used in a setup which retains stock sleeves, so why bother swapping out the oem pistons in the first place?

9:1 with stock rod compatibility (they obviously have no problems revving to the moon) is my vote. high horsepower (with the help of lots of boost obviously) cheap built motor.

 

You might as well run stock pistons then. It makes no sense unless you are looking for a ton of power. But if you are then you shouldnt be running high compression like that.

On all of these race car s2000s and other 4 cylinder turbo race cars do you think that they run super high compression? No they dont. Its not ideal eventhough they strictly run race fuel. Fact of the matter is its still a high compression engine which doesnt like a big turbo. You are going to get hot spots on the piston also because the fuel isnt going to sit evenly across which is another benefit of a dished piston.

I you are going to give your opinion with all these theorys but why not just do what works? and proven to work on a ton of cars.