I discovered that the type-r engines usually have a higher compression ratio to give a high hp. So, I wonder whether we can increase the ratio to gain performance.

 

You don't want to increase it unless you're going to use race fuel.

 

race fuel? that means higher octane?
how come in japan the type-r engines have a high compression ratio?

 

It's already 10.5:1 which is pretty high. You could probably get it up to 11:1 on 93 octane but anything higher would likely cause detonation if you didn't run race fuel.

Realtime runs 12.5:1 on their TSX but they also use 112 octane.

 

oh ic
thx very much
that means we couldn't use the type-r engines here because of our fuel...

 

I want 93 octane fuel...
The hightest that I have seen is 91 octane here in California, as far a I can recall, and that's what I use...

 

I guess that could possibly be a good reason why it's not offered here. 11:1 seems to be the magical barrier here in NA. The S2000, 360 Modena, and Gallardo are all around 11:1. Even the legendary ITR is only 10.6:1.

 

I use Sunoco 94 on a regular basis up here. :P


Does lower octane make for a cleaner burning fuel?

 

you are lucky....

 

putting higher octane gas in your car does not affect your car's comprasion ratio (just in case anybody read the above threads incorrectly).

another myth... placing higher octane gas in a car that requires regular octane will increase performance.

this is completely FALSE.

lastly... what octane method are they using... 93 octane here (USA) is the same as the high octane gases found in europe.

Not to mention, just about everywhere around where I live you can get 107.

 

While this is all true, I wasn't trying to imply that I would get better performance by using 94 instead of 91. I use Sunoco 94 gas exclusively because it doesn't contain any MMT unlike most of the gas stations up here.

 

Mmt?

 

http://www.organicconsumers.org/corp/CanadaMMT.cfm

Reader's digest version:

 

Right... i know your situation. MMT sucks.

 

With bigger cams and good tuning, my old B18C5 engine was at 11.5:1 CR and I was using 91 octane.

 

I think Europe uses the RON octane rating (Research Octane Number?) but the US uses the average (RON+MON)/2 (Motor Octane Number?). I maybe wrong.

 

you are correct, hence... don't compare octanes between countries.

 

You could use a Spoon Head Gasket and not have to use higher octane (without worry of detonation).

 

does k20a spoon head gasket fit our tsx...and wats the price?