high compression?

E

electronix

New Member
Hey guys, not actually being serious about this mod but I noticed some high compression pistons for the 93 up in the ebay thread.

I know the Satria GTI used a hi comp DOHC 93 to get about 103-105kw but what kind of gains can really be had from just swapping OEM pistons for hi comp ones in a SOHC? I reckon any real power gains would be a pain in the ass though due to having to run 98 + octane booster in each tank to avoid pinging.

Worth it? y/n/m? Discuss.
 
Satrias dont run HComp, unless you put the HC pistons in. They just have an extra cam, coil packs instead of dizzy etc.

You can get decent gains by going High Comp, but its the same thing as turbo, if you go crazy you need more maintenance and run the risk of something braking,

If you try to run like 14:1 im sure youll brakea something, but upping it a little bit wont hurt, thats what ive come up with anyways.
 
Satria GTIs run high compression:

wikipedia said:
The Satria Sports GTi was launched with a 138 bhp (103 kW) 1.8-litre Mitsubishi-sourced 4G93p engine, originally found in the Mitsubishi Lancer GSR, but minus the turbo and with an increase in compression to compensate for the power loss.

This model was later evolved by Lotus Engineering, the Satria GTi's engine and handling was later tuned and revised, delivering 141 brake horsepower (105 kW) at the wheels. It has a top speed of 204 km/h (127 mph).
Click to expand...
http://en.wikipedia.org/wiki/Proton_Satria#Satria_GTi
 
Its running increased compression in comparison to a turbo engine, but its normal for NA.

Turbos always run lower compression that NA, hence when you Turbo, you need LC pistons or a thicker headgasket.
 
So does running reasonable high compression require anything other than high compression pistons? Do you need to beef the engine up or moderate levels should be fine? Assume this would be done to a normal lancer sohc 93.

I have had a very quick read online but from what I can tell minimal work if youre wanting conservative increases in compression but major work if you wanna crank it up harder. Then again I guess it depends heavily what kinda engine it is and what it can handle.
 
Getting high compression pistons and nothing else is a waste of money.
Getting high comp pistons, ported head, cam, bigger intake, full exhaust, rods, and higher final drive will result in a quick NA car
 
Spetz said:
Getting high compression pistons and nothing else is a waste of money.
Getting high comp pistons, ported head, cam, bigger intake, full exhaust, rods, and higher final drive will result in a quick NA car
Click to expand...


+1

and fuel too.
 
it's like turboing, you're still going to need forged parts no matter. As stated above, if you want to run high comp, at least do it right.
 
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