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Old Oct 05, 2011, 10:45 AM
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Question
10% vs. 15% nitro fuels?

I fly mostly sport type engines like the OS LA series 40 & 65.

I'm thinking of changing from 15% to 10% nitro fuels to save a few bucks.The price difference is about $6 a gallon in my area.

How much performance difference will I encounter by doing this?
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Old Oct 05, 2011, 11:57 AM
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Jacksonville Fla.
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Nitro acts as an oxidizer for the methonol during the burn....I doubt you'll notice a difference at full power.....you might see a slight difference at idle....once retuned you'll be ok
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Old Oct 05, 2011, 01:10 PM
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United States, TN, Smyrna
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You will have to retune your engine on the high side and low side. If your engine is newer then this should not be a problem. Sometimes older engines have a temper in adjusting the low setting.

15% lets the engine run cooler, that is all we use in racing Q500.
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Old Oct 05, 2011, 03:01 PM
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You won't notice a difference.
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Old Oct 05, 2011, 06:54 PM
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Sport flying with 40 or 65 engines, you will not notice a difference. I sometimes buy 10% when they are out of 15% and the engine does not run any different even without retuning the low end in an Evo .46 and .60
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Old Oct 05, 2011, 07:41 PM
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High nitro content is for those trying to wring every last ounce of power out of their engines. If you are just sport flying, you could even try running 5%, or mix 5 and 10 to get 7.5%
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Old Oct 05, 2011, 07:51 PM
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I agree. The only thing one might notice is that 15% may give easier starts in cold weather than 5%
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Old Oct 06, 2011, 01:01 AM
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They'll run perfectly well with zero nitro but that's hard to find in a shop so go with the lowest nitro content you can get. I use zero nitro in my OS 40/46 VF's with no problem at all but then again if the temp gets down to around 50F I sit in front of my heater so I can't comment on ease of starting in what you guys call cold .
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Old Oct 06, 2011, 03:01 AM
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United States, MO, Springfield
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id run whats cheaper for just sport flying
i run 10% in my new .52 but my 1.00 Saito gets 30% heli fuel
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Old Oct 06, 2011, 01:54 PM
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You can not run no nitro, that is FAI fuel and you have to have a different glow plug for that plus you have to heat it so hot that it is burnt after one flight.

Stick with 10 or 15 percent, make sure the motor is tuned otherwise you will burn out the piston and sleeve.
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Old Oct 06, 2011, 05:52 PM
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USA, FL, Palm Harbor
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I heard 4 strokes like higher nitro. I have .70 I'm having trouble getting to run well. I understand could be many things but several have said go to 15 from 10 and then see what you get?
Mike
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Old Oct 06, 2011, 08:30 PM
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Quote:
Originally Posted by Mtrchs View Post
You can not run no nitro, that is FAI fuel and you have to have a different glow plug for that plus you have to heat it so hot that it is burnt after one flight.
Oh you have to be joking. I've been using zero nitro for more than 50 years in a huge range of engines. Plugs last just about forever although it's best to use a hot plug. On my advice, my son used zero nitro in his car engine and changed one plug in 40 hours of racing.
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Old Oct 07, 2011, 01:24 AM
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Quote:
Originally Posted by Mtrchs View Post
You can not run no nitro, that is FAI fuel and you have to have a different glow plug for that plus you have to heat it so hot that it is burnt after one flight.

Stick with 10 or 15 percent, make sure the motor is tuned otherwise you will burn out the piston and sleeve.
Misinformation
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Old Oct 07, 2011, 02:41 AM
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What plugs are you using.

We use glowbee plugs on the FAI Engines. They are a pain in the butt to get lit.
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Old Oct 07, 2011, 02:44 AM
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Try running 30% heli fuel in your four stroke. My saito's used to love it.
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