I know its a stupid question

[deadaim]

But... Which is more compression

12:1 or 10:5:1

haha i feel like an idiot

 

[hotphil]

well you shouldn't cuz i don't really know either, but i'd say the 12:1

 

[deadaim]

that what i was thinking but wanted to make sure before i orderd

 

[warriorxcr1]

yup 12.0-1

 

[93warriorridr]

yeah i'd say 12-1 too.

 

[deadaim]

ok rather then starting a new thread... Iv decided that im getting a JE piston 12:1 with a 85mm bore would a cometic gasket with a bore size of 85mm work with the JE set up or do i need a JE gasket?

 

[Guest]

yeah the gasket should work but you will need to use race gas with that high compression piston

 

[deadaim]

YFZ's have got 11:4:1 copression ratio and run fine on pump gas so anything premium or higher should be fine. or atleast i would think.

 

[98warrior]

You mean 93. I think there was a thread a long time ago about what gas to run when using a 12:1 piston...cant remember though

 

[deadaim]

yeah i ment 93 but i modified my post..

regular (usually 87 octane), mid-grade (usually 89 octane) and premium (usually 92 or 93)

 

[dswwarrior350]

12-1 is higher compression

Cometic gaskets would work fine.

You must run at the least 94.

 

[deadaim]

thanks DS if i cant get 94 at the pump where do i get it?

 

[dave76]

If you don't mine me asking deadaim, do you have an oil cooler????, If not make it a priorty to get one, with 12.1 compression it will greatly help keep detonation down. Detonation is somthing that will melt your piston, usually caused by lower octane gas, but could be caused by more heat due to the high compression. Also to reduce the chances, get yourself the .430 cam, the increased overlap will also help bleed down some compression, therefor reducing detonation. Hope this will help.

 

[dave76]

Any Sunoco station sells Ultra 94.

 

[deadaim]

Yeah im ordering a oil cooler with all the other stuff.... How much bottom end will i be sacraficing with a .430 cam? Thanks for the help dave. and everyone else

 

[98warrior]

I noticed no decrease what so ever with the 430. cam

 

[deadaim]

alright i herd there was a little decrease with it but i was not possitive... i donno i was thinking would benifit more from the 10:5:1 piston witha .430 and not have to deal with such high octane levels.. because that gas station the closest one is like 35 mins away..and how much of a power diffrence is there between the 10:5:1 and the 12:1

 

[yamarider]

^that sounds like a better plan to me^

it's probably only like a 1-1.5 hp difference, if that. And if you're running just on the borderline of detonantion, it's probably not going to be performing at peak anyways, so you might not lose anything between the 10.5 and 12

 

[deadaim]

alright thanks

 

[dave76]

Yeah the JE 10.5 will work fine, in all kinds of riding and heat.