CLASS RACER FORUM - View Single Post - V.P. C-11 vs. C-12

Mike Croley · 09-11-2015, 03:48 PM

The designation of "110" race fuel is derived exactly the same way the "87" octane designation at your local gas station pump is. And they both mean the same thing, so you have something to compare race fuel and pump gas.
Both race fuel and pump gas are tested in two ways. One test is called the Research Octane. The results of the research octane test are more pertinent to low compression, low rpm engines. The other test is the Motor Octane test. It relates much more to racing engines, higher compression and high rpm.
Each fuel goes through both tests, then the results are added together to get the R+M/2 number that you see posted on gas pumps and on the specs for race gas.The higher the Motor Octane number, the more race gas you're getting for your money. For instance, the Renegade Pro 110 is listed as R+M/2 of 110.5. The Motor Octane is 108,and the Reserch Octane is 113. Added together and then divided by 2 gives you 110.5 octane.

09-11-2015, 03:48 PM	#12
Mike Croley Member Join Date: Apr 2010 Posts: 182 Likes: 0 Liked 0 Times in 0 Posts	Re: V.P. C-11 vs. C-12 The designation of "110" race fuel is derived exactly the same way the "87" octane designation at your local gas station pump is. And they both mean the same thing, so you have something to compare race fuel and pump gas. Both race fuel and pump gas are tested in two ways. One test is called the Research Octane. The results of the research octane test are more pertinent to low compression, low rpm engines. The other test is the Motor Octane test. It relates much more to racing engines, higher compression and high rpm. Each fuel goes through both tests, then the results are added together to get the R+M/2 number that you see posted on gas pumps and on the specs for race gas.The higher the Motor Octane number, the more race gas you're getting for your money. For instance, the Renegade Pro 110 is listed as R+M/2 of 110.5. The Motor Octane is 108,and the Reserch Octane is 113. Added together and then divided by 2 gives you 110.5 octane. Last edited by Mike Croley; 09-11-2015 at 03:52 PM.