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Increasing Compression Ratio
Posted: Sat Dec 25, 2004 7:58 am
by mrx
OK. Just throwing it out there.
Obviously there are benefits, but what is required, cost etc to achieve this? I have been reading on the web that for every .1 increase, you can expect a 2% increase. Increase by .5 = 10% more power.
So, over to you. Thoughts?
Posted: Sat Dec 25, 2004 10:41 am
by Black_FTOGPX
Just remember that the 6A12 mivec already has a high compression ratio and was designed to run on 100 octane fuel.
If you are going to run a higher compression ratio you will need to run good fuel and try to keep intake temperatures to a minimum. If you use crappy fuel you will get a case of the "knocks" big time. Which will stunt the power more and could be bery bad for your engine.
Posted: Sat Dec 25, 2004 9:51 pm
by spetz
It might just be possible to use a thinner gasket otherwise custom pistons.
But yeah, they run high enoughy compression as it is.
Posted: Sat Dec 25, 2004 11:28 pm
by dannyboyau
personally i would not use any type of head gasket except for the original mitsubishi one, we have run my engine at 26 lb boost and not a problem, it screamed like a banshi but didnt loose a drop of coolant and purrs like a kitten under normal driving. The metal shim type of head gasket that mitsubishi use is exactly the same type of gasket you get if you buy a expensive HKS gasket for a high boost application on the nissian motors ( SR20, RB20, RB25, RB26, ETC )
I would change the pistons to custom made pistons or do some work to the combustion chamber or a combination ( weld up the combustion chamber on the heads so it is smaller ).
with these type of mods you would also have to remap the fuel map.
I also would recommend using ARP head studs