ABC Engines and NItro Change
09-21-2002 | 09:14 PM
#1
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From: Calgary,
AB, CANADA
ABC Engines and NItro Change
I have a TT36 ABC in a Raptor 30.
I have been using 10% CP since new.
10 gallons ago.
I couple of guys told me once I run an ABC engine with a set NItro content I cannot increase the nitro content later .
Is this true
I would like to try 15% or 20 %
Tnanks in advance
I have been using 10% CP since new.
10 gallons ago.
I couple of guys told me once I run an ABC engine with a set NItro content I cannot increase the nitro content later .
Is this true
I would like to try 15% or 20 %
Tnanks in advance
09-21-2002 | 09:30 PM
#2
My Feedback: (16)
ABC Engines and NItro Change
I would offer to say at this point, that is some picky notion if I ever heard one.
I would like to add that as you exceed 20%, the increase in rpm is less on a sport 2 cycle such as yours.
Be sure and adjust your needle conservatively until you get used to your new brew.
jim
I would like to add that as you exceed 20%, the increase in rpm is less on a sport 2 cycle such as yours.
Be sure and adjust your needle conservatively until you get used to your new brew.
jim
09-21-2002 | 11:35 PM
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From: Lake In The Hills ,
IL
ABC Engines and NItro Change
You can always go up in nitro, but the piston and cylinder will go through a miniature "break-in" with the higher nitro fuel due to the higher temperatures. Not a problem unless you try to go back to 10% nitro later, most abc/abn engines won't run well anymore when you try to go back down in nitro.
What I know, JJ
What I know, JJ
09-22-2002 | 12:31 AM
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From: Adelaide, South Australia
ABC Engines and NItro Change
This is one of the urban myths that's been around for quite a while now. Changing nitro content can make a few degrees difference in the running temp but so can flying at part throttle, summer /winter air temps or by going to a different glow plug.
http://www.modeltechnics.com/glowplug/firepower.html
That site has some results from tests on various engines using different plugs and fuels and notes the head temperatures.
http://www.modeltechnics.com/glowplug/firepower.html
That site has some results from tests on various engines using different plugs and fuels and notes the head temperatures.
09-23-2002 | 11:27 PM
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From: Sarasota, FL
ABC Engines and NItro Change
Nitro allows a much richer needle setting ( more fuel to be burned for the same amt of time ). Burning more fuel means more lube also goes through the engine also. No matter what Nitro content, LEAN means HOT. The more nitro, the less sensitive the needle valve is, so you can run it richer ( more fuel/oil through to cool the engine ), without a noticeable drop in rpm. I have never had a problem switching back and forth with Nitro content. I used to run 30/20 in all my engines, but flight times were short. Now I just use the 30% for racing, and 10% for every other flight. 30% to 10% have more than doubled my flight time. If you want more power, make a mousse can pipe, and increase the top end by 1 or 2 thousand rpm ( more than any nitro could do ).
