When you change the fuel you are using from x brand to x brand, do you need to take it easy a little bit so the engine get used to the change or what? Is there a special procedure or something?

nvm i found the answer elsewhere

so what is it. Im curious too

Might have to adjust the needles, but other than that, let loose

Because all fuels are a little different in oil content and oil blends (natural and synthetic), you should richen your high end needle a little (to make sure the engine will not be running too hot).

I would richen the high speed needle about an eighth of a turn. Run it for a minute to get it up to temperature then adjust it for temperature and performance.

Have fun.

Your supposed to take it easy for a tank or two to let the internals adjust to the different pressures of the fuel. It also needs to be tuned a little.

at least thats what i found in a search

hmmm, didn't realize that. I figured other than tuning it wouldn't be any diff.

I've been racing nitro vehicles for around 10 years and there's nothing in an engine that has to adapt or adjust. The internals consist entirely of a piston, sleeve, wrist pin, connecting rod, crankshaft, case, and backing plate. None of these parts absorb or are modified by fuel in any way, shape, or form.

Engines will run at different teperatures when using different fuels. You want to richen the engine prior to changing fuels as a precautionary measure in case your engine runs hotter with the new fuel. Once the engine has been run for a minute or so, the engine will be at operating temperature and it is now time to retune the engine for temperature and performance.

Thats what was thinking

well ok maybe im wronge, i took that from what someone else said in another thread...

There's about 1 thread a month recommending you let your engine get used to, aclimate, etc to the new fuel. Whenever I see it, I try to dispell the myth.

Well actually you are supposed to let it idle, at least that is what the prez of Wildcat fuels says. I read an article that says every engine goes through a process called " hysteresis ". It also said that 99% of the time your engine will be fine if you dont let it idle, but for that 1% it will last a little longer. But anyways, i used to do what i8tweety does when i switched fuel, which is great, never had any problems, but now i just use Trinity fuel.

I'm going to switch from 10% nitro to 16% nitro. Its the same manufacturer, just a higher nitro content. Does this advice apply to that as well?

uh huh.

Todd, if you answer any more of my questions, I fear your gonna start charging me an R/C consultation fee.
Dr Marsh will see you now..............

The DR is IN the house! I think you will like the extra % of nitro too. Add in a little HGH and 250MG/week of straight testosterone, just to get things right with your health.

I8tweety is on the money.....here is what OS Engines had to say. Direct quote...

Thank you for your recent e-mail.

When changing nitro fuels you should be able to just run it with just a re-tuning. That may not be needed either if the oil content is the same.

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*sigh* Another cat bites the dust....

Yes, there was a strong offensive back in the day about idleing through a tank of new fuel... *Cough* Which I had Nothing to do with... *Cough* It's not entirely necessary... And maby we should have a Mod sanitize some of those threads...

Then again, if we had a mod santize everything that was wrong on this board, there would be like 3 threads left. I remeber one about J-Lo, and I think I remeber a thread about Hot Pockets not to long ago that was right on the money...

I have killed Garfield! Sylvester is next!

I taught I saw a puddy cat!

I'm next? What'd I do?

When you change fuel the fuel has agents in it that bond to your internal parts. When changing fuels some fuels wash away the agents and deposit there own. It would be a good idea to let the engine idle for a half a tank and to also richin up the hi-side needle. this is just MO. But if I am way out of the park with this just let me know.

Even if what you say is true, which I'm not too sure of, there would be no lag time where the engine would be unprotected. As long as fuel with the new "agent" is passing over the engine components it will simultaneously dissolve and replace the old "agent." There wouldn't be a time between the washing away and the deposition....fuel is a chemical, as long as it's there it's going to be doing something...

And if it is not there... Then your engine is doing nothing...

It's sooooo win - win...