The fuel I am running is Sigs, who normally makes airplane fuel, but has a couple different RC car blends too.Â* This stuff is 50% castor - 50% Klotz synthetic with 10% nitro.
Sounds like you are trying to run Champion ''10''.Â*Â*A good airplane fuel, butÂ*inappropriate for car engines.Â* 20% total lubrication is way too high.Â* And why cheap out with the 10% nitro level?Â*
I've seen people go round and round about the oil content, and I just don't care to do it.Â* Granted, I am CHEAP, thus IÂ*buy inexpensive fuel... but there are too many red herrings in this hobby if you ask me.Â* The bottom line is airplane fuel is not all that different than car fuel aside from marketing
and a couple percentÂ*more or less oil.Â* To theÂ*professionalÂ*racer there is probably aÂ*difference... to the backÂ*yard basher, I doubt it. Â* I have had terrific luck with this inexpensive fuel (not necessarily low quality fuel thought) Â*thus far... no issues with wear inside the engine - crankÂ*rod and sleeve are all good.Â*Â*IÂ*did have to replace theÂ*rear bearing which is common in the 3.3, but have had no issues since replacing it.Â* After almost 5 gallons I did a re pinch on the sleeve to bring the compression andÂ*performanceÂ*back up to like new.Â* Also, no issues with tuning until now.Â*
For what it's worth, my brother in law's revo is running traxxas top fuel 20%... he swears my revo is faster with the 10% nitro, though IÂ*can't tell the difference myself.Â* This is not to say there are no other mitigating factors that would cause this scenario to play out, ie tuning, piston/sleeve fit, etc etc.Â*
I did run a half a tank of traxxas fuel through recently just to check if my fuel was the issue and i basically had the same results just at different needle settings.
Well, I said I wasn't going to do it, but as far as oil content goes... one thing I will say is that it makes sense to runÂ* higher total oil content with lower nitro content.Â* From what IÂ*understand, nitro brings additional oxygen to the combustion cycle, thus allowing for more fuel to be entered into each combustion stroke which generates more power.Â* With a lower nitro content, you have less fuel going through each combustion cycle... in order to keep the VOLUMEÂ*of oil the same through each stroke, you would need then a higher total oil percent.Â* What exactly these ratios are I do not know.Â* All IÂ*know is that IÂ*have run this fuel in two different 3.3's without issue.Â* Tuning is definitely different... but once it's tuned your good to go.Â* All that said... I do not think 20% oil content is necessary, though IÂ*personally dont see a problem with it.Â* Heck, isn't traxxas fuel like 17 or 18%?Â*
At this point I am just going to run the engine.Â* I was able to keep it below 270 last night bashing about pretty hard, mostly in the 240 range, so I'm good.Â* It may not be running perfectly, but again I'm not racing... just bashing about.Â*Â*