Not24
Posts: 999
Joined: 12/7/2002
From: Gloucester,
VA, USA
Status: offline
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quote:
ORIGINAL: buzzingb
I am just not buying it. However, it is worth a try with the low nitro. Nitro is what is supposed to help transition. After I have tried all this other stuff like some on here what will it hurt to try low nitro.
Been doing a lot of thinking on this in the past 24 hours. The low nitro fuel is really starting to make sense to me. I have yet to try the low nitro, but these are my thoughts. When I did the plug test, I saw no appreciable difference in rpms. I took that to mean that there was no detonation, and all was well. Perhaps that theory was wrong, and there was detonation with all the plugs due to the high nitro. Remember, I used Powermaster 10%. The most recent tests were with a mixed gallon of fuel that could be somewhere between 15 and 18%. I observed an excessively wet exhaust throughout the rpm range. Is it possible that this fuel is too hot for this engine, and to peak the needles, it needs to be slobbery rich to prevent detonation? Also remember that I could never get into a nice four stroking rich mode. It would slow down appreciably, then flood out and try to quit. My guess here is that the low nitro will solve the vague high needle, and also assist in the transition. It will do this by running at a lower fuel flow setting, i.e., leaner needle settings. Also, what I perceived as leaning and sagging with the nose vertical might have actually been detonation. I know for a fact that this phenomena was worse with the higher nitro, and much better on the 10%. These european engines are designed for low nitro content fuels due to availability issues over there. It stands to reason that perhaps the engines are actually doing what they are supposed to do, and the carbs are woking exactly as designed, with no need for modifications. How, then, do I explain those engines that are running well on 15%? It is quite possible that they are doing fine also, when you factor in differences in altitude and temperature. Remember that we tend to run higher nitro in the summer to gain lost performance. Higher altitude may also be a variable that allows the higher nitro to not detonate. Please don't read this and believe it to be the truth or fact. It is only a theory and an opinion.
I bought some FAI fuel today to try this theory out on my engine. I also have the 5% Omega. I have made no further mods to the carb, and I should be able to get in some runs tomorrow. If anyone has any requests for things to try, let me know. I might be able to work them into my testing.
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Fly it till you break it!
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> RE: My 2300 only likes one prop 
RE: My 2300 only likes one prop - 
). Although, I do wonder if the carb is at fault. My guess is that even if you get it running good with this stock carb that you would find that going to a better carb would make it run even better. I think most people would be happy with good and even consider it to be great. It depends how critical you are I guess--I want my 2 strokes to transition as well as my 4 stokes.