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Old 04-01-2004, 10:31 PM   #1
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Im surprised no one else has posted this. I got my May issue of fly R/C in March and just now read the QandA about engines and there is a question by Andrew about nitro content and ignition timing. I read it and it still makes no sense to me, lol. Anyway, I just thought I would share this.
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Old 04-02-2004, 09:34 AM   #2
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I to noticed Andrew's question in the Fly RC magazine. I was thinking Andrew might have mentioned that he posed this question to the magazine. I to am not fully clear on the answer he got.
More Nitro=More Combustion Chamber Heat. This increase in temp causes the mixture to fire sooner, thus the advanced timing. To retard this then you could a...install a colder plug, b...richen the mixture setting, c....lessen the nitro content of the fuel,
So if i got that right, then the increased nitro content then infact ADVANCED the timing of the firing of the air/fuel mixture...
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Old 04-02-2004, 09:48 AM   #3
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That sounds right, Phattires.
And if your timing gets too advanced, you get detonation, which gives you that "frying egg" sound.
High compression will do the same thing. (more heat)
Engines made for the no-nitro European market have higher compression, and can be a problem with detonation when run with nitro.
The remedy in this case would be to reduce compression by adding a shim under the head.

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Old 04-04-2004, 07:44 PM   #4
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What happened guys is that in the Feb issue I didnt quite agree with Dave Gierke's response to another question. He stated that more nitro RETARDS timing, which of course goes against everything I have experienced. In the full scale racing world of top fuel dragsters, they do have to advance the timing when running 100% nitromethane compared to methanol, as the nitromethane takes longer to burn.

BUT.... in the model engines we run it seems from experience that when increasing nitro content the compression must be lowered, or use a colder plug to RETARD timing.

Dave is one of the most knowledgeable people in the engine world today. He explained to me some of his theories but I was not 100% clear either. My letter was just part of the discussion...
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