The problem with running 87 octane gas with an 11:1 piston is the fact that he risks detonation because the 87 octane gas combusts alot better than 91 octane. If he can run 87 octane in his engine without any detonation or pinging he will produce more power than if he ran a higher octane gas. Many people make the mistake of using too high octane gas thinking they will get more power. An example would be someone with a 11:1 using 110 octane fuel. Some VP and some other fuel companies do make a gas that actually will increase hp.

In short the lower octane, the more unstable a fuel is. High the octane the more stable a fuel will be, so it can be compressed more without detonation.

 

Wiesco makes a good one.
I have a Pro-X in my hand and it looks ok but i have no feed back on it yet ( heck anything can look good )
If had the choice of any out there i would go with Ross or Wiesco. I have been told by more than one Person, and read on here that the J.E. Piston breaks. I have never actually seen it though.

 

Also DASA makes some good aftermarket parts. they make 2 or 3 different compression ratios for the Raptor

 

Yeah, I'm deciding between the Wiesco or Ross, but I can't find any info on the Ross. Where do people get them? How much?

Chris

 

Go to 14mins.com click on Craycraft Racing, get there phone number and talk to Bob, I think he sells them.

 

So do I ask for a 11:1 ross so I can run pump gas?

Chris

 

talk to him about it and he can tell you everything that you need to know.

 

I ran VP race gas (black can) when I first got my piston in, but then I went with a 91/vp mix and it didnt ping, so I went with pure 91 and still didnt ping and now Im at 87 with no pinging and running in 100+ heat.

 

Guys, go back to school on 4-strokes. A high flow exhaust does not lower compression, it will however lower chamber temperatures thus helping to prevent detonation. When in doubt as to compression and fuel octane go with the higher octane. Detonation destroys engines!! Also, a larger duration cam with tigher lobe seperations (more valve overlap) will decrease dynamic compression ratios helping to prevent detonation. The static compression ration would remain the same but a 12:1 piston with a big duration (lots of overlap) cam can have dynamic compression as low as 10:1.

 

Well said! I was about to post that same thing...looks like ya beat me to it [img]i/expressions/face-icon-small-smile.gif[/img]