Lower compression does not equal higher displacement. With lower compression you are compressing less air therefore decreasing the amount of air you are moving with each stroke. You can only increase displacement with a bigger cylinder bore or a larger stroke. Please educate yourself before posting further misinformation.

 

high compresion just means your changing how much you compress the gas in the cylinder by adding metal to the piston (DOME PISTON) you take up more room in the cylinder which mean you cant fill the cylinder with as much air. high compression will just increase your torque and make a quicker throttle response

how do you come up with compressing less air??? your compressing more air just not as much, you compress less air with high compression your just compressing it more

 

Higher compression does not just increase torque, it increases horsepower as well. Just for a quick example, if you have two Evo's with the same exact modifications and the only difference is compression, the Evo with the higher compression will make more power through the entire graph psi for psi. What you are saying, might make sense to you, but in reality makes absolutely no sense whatsoever. Please do A LOT of research before continually attempting to pass off your incorrect opinion as fact.

 

You're talking about a ~40cc difference with 10:1 pistons.

 

I said it will increase spool time...... i didnt say anything about how much hp it will make thats has alot more factors involved than just compression and i dont think it will make as much hp power on pump due to the higher cylinder temp just go bolt a turbo on your stock engine and then go tell everyone you know everything about engine theory and building motors i tried to be cool about this but you wanna be a dick in each post thats fine i can tooo

 

I fully understand the characteristics of a motor, hence my accomplishments that make up my signature. If all it takes is bolting on a turbo, even on a factory motor to go fast, I wouldn't be over a second quicker then any other Evo in the Tampa Bay area. You will not spool a turbo quicker with lower compression. The mere implication of it shows sheer ignorance and lack of understanding of engine dynamics and the affects it has on a turbocharger. Everyone that frequents the Mitsubishi forum is here to learn. Nothing bugs me more then having someone try and pass off their bs opinion as fact, especially when it is dead wrong.

 

Thats why there's meth kits...Ontop of that, i'm going to be running e85, so it still doesn't matter lmao

 

Higher compression = faster spool time. Why would forged pistons come with stock compression ratio AND higher compression like 9.5.1? Usually when you build a stroker, you have to bore 40 over to get the right displacement and when you're planning on running a massive turbo its better to have higher compression that way you make more power quicker in your powerband. Im getting ready to run a 70trim on a stock 6 bolt and its not going to be at full spool til 5500 rpms. If I would have waited when I rebuilt my motor and put 8.5.1 7 bolt pistons on my 1g rods I would see full spool at 4700-5000.

 

I dont think you're gonna get 800rpm spool from a .7 bump in static CR...it seems to me that the differences would be barely noticeable, if anything hi comp spooling slightly faster because of the additional heat energy/tq.

 

omgosh, look at what spools a turbo. its the exhaust flow and egt. tell me what higher compression does please? why do all motor guys run 12.5.1 compression pistons then, if its barely noticable