Which fuels use %100 synthetic oil?

Nitrotane..I am pretty sure so does OD...

As a general rule the cleaner the fuel burns, the less caster it has in it...

Odonnell leaves a TON of orange oily residue inside your engine and even in your fuel system. I find it hard to believe that there's no castor in it. I could be wrong though. Either way OD is awesome fuel and not at all detrimental to the longevity of your engine.

I am talking about the black carbon residue on top of the piston......OD is a solid fuel no doubt, but I have lost a few rod bushings on it when I am pushing the limits......But unless your mercilessly over revving your engine its not even relevant... I find fuel high in caster protect better in extreme applications, but there is more carbon deposit left on the piston top...I also find you can run a leaner mixture with a greater resistance to detonation....tuning can be a little trickier on LSN, heavy caster will load up a little quicker making the LSN adjustment more critical.....I fin synthetic based fuels to tune little easier, more forgiving on the LSN...burn cleaner with no deposit, but under extreme conditions we see far more spun rod bushings...

Who said that pro driver is only 4.5% castor?

Was it a byrons rep such as ryan godberson?

A little more on the low speed needle. I have always found my greatest gains in runtime are made by working with adjustment to the low speed needle. To me it is the hardest to get set right because it seems to have the widest tuning window. Depending on the idle gap setting it can be off quite a bit and still sound fairly good.

Most of the time just a little running will let you get the high speed close then it can be set correctly after the low speed is adjusted.

A good example is a dirt oval car I adjusted for another racer about a month ago. He was pleased with performance but getting less than 4 minutes per tank. Start adjusting on the low speed needle and idle with tweeks to the high speed and run times went to over 6 minutes, power was higher and temps were lower. It was rich on the bottom and the idle gap was covering it up. BTW, the high speed needle had to be richened because it was so fat on the bottom.

There can be a pretty good interaction between the needles at times.

And no, I don't claim to be good at tuning, but I'm a lot better than some that think they are.

Ed M.

Houston,


Found the following on the Byron website:

Synthetic/Castor Ratio: The ratio of synthetic to castor is engineered specifically for the application. Performance Blended Premium Sport Fuels are blended with an 80:20 ratio of synthetic to castor. RACE Gen2 fuels (Except RTR20 Gen2 and RTR33 Gen2) are blended with a 50:50 ratio of synthetic to castor.

So it would seem that 9% total oil would be 4.5 % castor and 4.5% synthetic.

When talking to byrons co-owner at the byrons challenge he was telling me all byrons fuels use a minimum of 6% real castor oil , hmmmm interesting . Gonna have to call Ryan tomorrow ,

Torco is also 100% synthetic

I believe that used to be true but according to their own website it is only 4.5% now. Most top onroad guys agree that whatever it is, it's not enough. I've seen the entire Mugen team dumping an ounce of castor into every gallon on their bench before. It just seems to be required to get onroad motors to stay together at the long periods of sustained high rpms we get on the longer tracks.

One of the best fuels I have ever used for both performance and longevity was only 8% oil but ALL castor while 10% blends have suffered rod bearing failures. So as far as I'm concerned, give me castor or give me death

As for OD, I have no idea what's up with that stuff. It does burn clean like an all synth fuel but seems to run like an all or high castor fuel. I suspect it's high castor with some sort of detergent in it to burn clean but who knows? It's definitely different from virtually everything else.

I agree about OD. It burns very clean and doesn't leave carbon inside your engine, but does leave a lot of oil behind. It is strange, but works very well whatever it uses. I've yet to find a fuel that runs as well and protects as well as the OD does.

And back to original post about mileage, here's a little article I just wrote about the subject in the onroad forum. While the specifics are different from offroad, the principal is the same.

http://www.rctech.net/forum/onroad-n...s-runtime.html