20% or 30% Nitro????

[wakebum187]

Hey I have been running 30% and it's great but the price is like 26.00 dollars a gallon but 20% is only 18 dollars is there a big difference in the two? would I be dumb to switch to 20%? I like to do hard 3D also so power is nice :)
Thanks Sean

[tchavei]

I'm running 20% as 30% is only like $55 here :S

You will notice some power decrease but I've seen fine 3D with 10% nitro too. Try it and set your needles accordingly.

Don't forget to report back :)

Tony

[lawrenmd]

If you are flying hard you need good throttle response, going to 20% is going to make the motor less responsive. Additionally what I found out is you have to lean the motor more with 20% to try and make up for the power loss which in turn wears the motor out much quicker. Just my opinion.

[Forced_Induction]

I have been told back in my plane days that with an engine, you can move up in nitro percent, but due to the heat expansion difference between the piston and the cylinder, you cant move back down. i was told that it will wear an engine out alot quicker. not %100 sure about this though as i havent tried it myself.

[wakebum187]

So you dont think I should move down to 20% Nitro? 30% is so damn much money.

[Forced_Induction]

well, im just saying that the way i understand it is that the engine has already broken itself in for the higher heat of the high nitro content. from what i understand, youd be sacrificing engine life. if you want, give it a try. I would simply out of curiosity if it were me. If you do decide, please let me know what long term effects it has. my email is forced__induction@hotmail.com.

[raptordave]

I switch back and forth when my lhs is out of my normal fuel.you will be fine as long as you adjust your needle when you do, try the 20 if you dont like it just go back to 30.

[Pinecone]

These engines have rings. That might be true for an ABC engine. But more, the heat is based on how lean you run it.

[MikeWz]

I have been told back in my plane days that with an engine, you can move up in nitro percent, but due to the heat expansion difference between the piston and the cylinder, you cant move back down. i was told that it will wear an engine out alot quicker. not %100 sure about this though as i havent tried it myself.

I think you'd be surprised to find out that motors running on 30% nitro actually run cooler than motors run with 20%. Because of the higher nitro percentage, the fuel burns more efficiently and you can therefore richen up your HSN allowing more cold fuel and oil to come in and cool down the motor.

[Forced_Induction]

from what i understand is the reason you run higher nitro content is to get more power from an engine. nitromethane burns at a closer ratio to oxygen compared to methanol. i cant remember what methanols ratio is, but nitromethane is 1:1 with oxygen. you can get higher power from the same engine with the same needle settings with a higher nitro content. yes running 30%, you could get cooler running temps, but at the sacrifice of the higher performance. At least thats how i understand it.

[Pinecone]

Actually nitromethane releases O2 at high temp, so it acts like supercharging.

And you have to runa richer mixture because a) there is less methanol in fuel, but b) more O2 to burn in the combudstion chamber.

[Forced_Induction]

hmmm, i never knew that!
that kind of puts a new angle on it then, thanks