explain this!
 

whenever i put o donnel fuel into my 3.3 it starts smoking and going really slow but then i empty the tank and fill it up with model techniques or tornado and the engine is perfectly fine again, i just dont get it!

RE: explain this!
 

what %? you probly need to add or take out a head shim and RETUNE.

RE: explain this!
 

It's different fuel, you have to retune you engine every time you change fuel brands. No two are alike. Byrons is a great fuel, you just need to lean it out more when using it.

RE: explain this!
 

so if i richen the mixture it should work fine? and im on 16% for odonnel and model techniques and 20% tornado.

RE: explain this!
 

No I said lean, not rich. O'Donnel requires you lean it out a bit more.

BTW, in my previoius post I said Byrons, I meant O'Donnels

Also, minimum nitro content for car/trucks is 20%. Did you mean 16% oil?

RE: explain this!
 

well, anything with 16% of oil will run like crap...get o donnell race blend then retune

RE: explain this!
 

odonnel does like to run lean for some reason. try not to over lean it as that can hurt the engine. and when your done with that get some byrons race, thats the best stuff i used so far.

RE: explain this!
 

Not if it is a 3.3. The traxxas engines will run better and longer with 16% oil.

RE: explain this!
 

eerrr....no, do some research, you'll find that anything above 12% oil contain will just make your car run hotter and rob performance, higher oil contain will not give you better engine protection, period. Personally I stick with o'donnell racing fuel with 8% oil 20% nitro. :D

RE: explain this!
 

Think about it, the less oil content, the less lubrication, the more oil, the more lubrication, more lubrication means less friction and less friction means less heat, less heat means your engine will last longer. Now less oil has more friction in turn makes more heat and therfore the engine will not last as long. It may give you more performance but not enought to make your engine last a shorter amount of time, unless you are racing. So i would rather sacrafice a little performance gain for a engine to last longer. I may be wrong but from common sence and some experience with different engines and fuel, that is what i got out of it all.

RE: explain this!
 

then you get carbon build up when the oil burns off...i think

RE: explain this!
 

Once you get over 12% oil its pretty much useless. Look at all the extra oil that comes out the exhaust. There has been alot of differnet articles that will support this theory. Once you use a nitro with an oil content of more than 12% you have to lean out the mixture more due to the extra percentage of oil.

RE: explain this!
 

Is it O’Donnell Ready To Run or Race blend? Their RTR blend has a lot of oil in it! Their race blend is good fuel but I prefer Byron. You all so are running two different nitro contents and will have to re tune for this. Yes many times when changing fuels you have to re tune. All so you will have to re tune for different oil content. I personally will not run under 20% nitro content with mo more then 12% oil content. I for the most part run 30% Byron.

RE: explain this!
 

Would you fill your car so the transmission fluid was over the fill line or would you fill you oil right up? The more oil you have the more it has to work to push that thick oil through your engine. Why do you think they have fill lines on a car? I've tried all kinds and the higher oil content makes my car run hotter and slower. If your worried about your engine life think about it running hotter with a thicker oil content. Your oil turns into sludge when it heats up too much. Stick with the race blend and you will be fine and if you go to 30% and try and go back to 20% you will never get it to tune correctly.

RE: explain this!
 

Why 8% to 12% Oil

Using high oil content fuels in gas car engines won't provide improved engine life, as some would expect. Through extensive testing we've discovered the point of diminishing return as far as oil content to engine life is actually around 8% for most car engines. In other words any more oil than 8% in the fuel does noting to improve the life of a car engine. In fact the secondary effects of high oil content fuels can actually cause engine damage by encouraging over lean runs. Here's how.

Using high oil content fuel causes a car engine to be unresponsive during acceleration acting as if the engine were running rich. Typically when using high oil content fuel, in order to get crisp acceleration and response, an engine will need to be adjusted overly lean. In addition the high oil content prevents lean bog when an engine is over-leaned thus allowing the engine to run at this lean setting without the customary telltale lean bog warning letting you know the engine is overheating.

In summary, high oil content fuels don't give added protection. The point of diminishing return from a protection standpoint in a gas car application is about 8% oil depending on the oil type and engine. Anymore oil than this doesn't offer added protection and has potential secondary effects that reduce performance and can actually cause you to over lean your engine in an attempt to get crisp throttle response and acceleration

http://www.racewayatv.com/rc-car/rc-...-car-fuel.html
http://www.horizonhobby.com/Explore/...ArticleID=1385

RE: explain this!
 

yah what 46u said

RE: explain this!
 

Whomever made you believe that you needed to run higher oil contain must be very eager to sell you new engine and more parts, but hey...it's your engine and your money, do whatever you wish.


Please see 46u's reply for more detail explaination.

RE: explain this!
 

alcahol is as thin as water. oil is thick. would you rather have your engine full of thick crap or not?

RE: explain this!
 

Some one must have not told my engines that as I have quite a few engines with 8 plus gallons on them still running fine and NEVER ran over 12% oil content. With the quality of oils they have this day and age the more oil concept is nothing but an old wise tale. :eek:

RE: explain this!
 

Even though I agree with 46u and the 8%-12% oil content is right and the old myth that more is better is not correct for this application. I dont know how everyone says that the RTR O'Donell fuel has to much oil as they do not say what the oil content is in there fuels (at least they didnt the last time I checked). But with that said I do fully agree with 46u more is not always better.

RE: explain this!
 

I will tell you why I say O’Donnell RTR has too much oil in it is because I ran it one time and can tell from tuning and how it ran if the oil content is high. If you take one of my RC vehicles and put high oil content fuel in with out telling me it will not take long before I will know it. [8D]

RE: explain this!
 

All so unless you are a very good engine tuner I recommend staying around 12% and never go under 10%.

RE: explain this!
 

20% Tornado is about equivalent to a 25% of most other company fuels. Just run with the fuel that it runs best with and tune from there, or pick up the more readily available fuel and tune for that certain fuel.

Do NOT do a switch-a-roo on fuels. Tune your engine for one fuel, then stick with it...

RE: explain this!
 

i dont think its that bad to switch fuel, as long as you retune and reshim if needed

RE: explain this!
 

I have engines I have run 4 or 5 different brand fuels in but yes you need to retune some times. Yes if you go up on nitro content you might have to shim the head and or change the glow plug heat range. 20% fuel is 20% and unless you change the percentage it is still 20%. :eek: Now if you have 20% with high oil content it will not run as good as 20% with a lower oil content! :D