11.1 compression do i need to run race gas?

[ranger400ex1994]

i am looking to keep my stock bore and put in either a wiesco or ross or JE pitson in? if its wiesco i was going to go with 11.1 if it was JE it would either be 10.8 or 11.1 but i would like to know if i can run 11.1 compression on 93 octane.

[MXRACER86]

yes you can run 93 octane

[frogburner]

you can run 87 if you want to.. I used to whenever I had no other choice... Heck i took out the new motor I have now, and ran 92 w/ octane booster..and it ran fine till it got a little warm in the woods, but other than that, in the flat with the air pushin across the motor, its fine..

[HondaRacing23]

I have a 426 11:01 comp. if i run race gas 110 oct my bike runs like sh*#. If I run 93 it runs great. I am having some carb problems now though so it dont wanna run it all.:D

[honda250xrider]

it runs like sh*t because race gas burns slower you will need to rejet your carb each time you switch between race gas and regular 93 fuel

[TC426EX]

I say youll want to do a 50/50 mix at least.... even with that compression. Running it on lower octane increases the risk of detonation and running high temperatures... I would be safe and run 50/50 premium pump with 110 race gas. My 426 used to have 11.5/1 compression before I went to the 12:1, and pump gas wasnt even an option whatsoever at .5 more than what you are running...Significant deonation and super high temps...

[CRE Performance]

This is a little known fact but an I/C engine will run at its best when ran on the lowest octane possible without detonation. If 400 EX's were liquid cooled, it would run good at even 12.5:1 on 93 octane. So there for, the conditions you ride in (hot or cold) can play a major role in needed octane. But with 11.0:1 I wouldnt even consider race fuel unless you were riding in the desert or you have an oil flow problem, then youll have problems regardless.

[JDiablo]

how bout 93 octane gas with that booser crap(does that really work) and a oversized oil tank,a oil cooler that is molycoated to help keep temps down as well,will i be able to run straight gas then in a 11:1?

[LazeR]

If i understood him correctly if you had all that done then you would have less of a need for race fuel than before you did all the upgrades to keep it cooler.

[JDiablo]

yes i have a oversized oil tank,i just bought a pil cooler that was molycoated by paps,and plan on running 93 or 94 octance,so i should be ok,and i think im going to get w/e internals molycoated as well,camshaft,piston,rings etc IF i could,i know that you could wiht the piston though

[hondarider2006]

call me crazy...but I run 90(highest octane at the pumps) and I have 0 heating or detination problems.

[LazeR]

Originally posted by hondarider2006
call me crazy...but I run 90(highest octane at the pumps) and I have 0 heating or detination problems.

You're crazy :p As long as it doesnt ping or over heat, i would say you're all good :macho

[400exdad]

You should be fine. Look into the "Have You Decked that Cylinder" thread in the FAQ.... some good stuff! You can help yourself out a lot by putting the right head and base gaskets on it.... plus the advertised compression is no where near what you think it is without the gasket changes. I went with some mild porting and a XR cam at the same time... I love mine!