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Model Forum / Radio Controlled / Land Models / May 2005Tune by temp or performance?
Hello again, I know, I know, don't tune by temp, that's what they all say.................but I'm really concerned about the temps I'm seeing. Megatech Gladiator, 1.6HP Q1.6 (.16) motor. Running Trinity 20/12 fuel. Engine is now broken in and I started leanng her out today. The leaner I go, the faster it gets, the hotter it gets. Right now she's running great and temps are between 300-315* running it really hard. Engine shows no signs of being overheated (no goofy idle, no loss of performance, no lean bog, etc.). I know I could go leaner and get more power, but everything I've read says that 300 is just about as hot as you want to go. Opinions? Doc My opinion.. If it runs well at no more than 275* ..leave it there.. If you have to have more power try 30% fuel.. or try a hotter plug..or bigger cooling head..or a .21-.28 ;) > Hello again, > [quoted text clipped - 15 lines] > > Doc > My opinion.. > If it runs well at no more than 275* ..leave it there.. > If you have to have more power try 30% fuel.. > or try a hotter plug..or bigger cooling head..or a .21-.28 ;) Higher nitro content equals a hotter burn does it not? Doc >> Hello again, >> [quoted text clipped - 17 lines] >> >> Doc Generally,yes,you will get less life from your motor using a higher nitro content. The assumption/opinion I have is that if you are running at over 300+ degrees with 20% your probably not going to do any more damage to the motor than you already are by significantly (25*+) lowering your temperature and running 30%........ With my models I simply find the richest point that it will run(and/or shift for multispeed) ..and lean approx an 1/8 to 1/2 turn from there (dependant on weather and factors) and they never seem to top over 250* and run great..... As another poster stated, I also use O'Donells fuel (20%) it's seems to be the best....good oil content...clear(no blue or purple gunk left in the tank) and an extremely good rust inhibitor (after run oil after every tank?..no way)....... Combined with an MC59 (medium temp) plug...... > > My opinion.. > > If it runs well at no more than 275* ..leave it there.. [quoted text clipped - 4 lines] > > Doc WOW!!! That is HOT!! If I break 220F I shut down. Look at your head. At that temp you should experience detonation. The head will be pitted around hot spots. I run the O'Donnell fuel. It is extremely wet stuff. I have discovered after years of running 2 stroke motorcycles that more gas and oil entering the combustion chamber achieves 2 things: Cooling and a much better seal around the piston. This means horse power. You may get HP under with your current tuning. Then again I will bet a dozen donuts your engine life will be brief. > Hello again, > [quoted text clipped - 15 lines] > > Doc > WOW!!! That is HOT!! If I break 220F I shut down. Look at your head. At > that temp you should experience detonation. The head will be pitted around [quoted text clipped - 4 lines] > under with your current tuning. Then again I will bet a dozen donuts your > engine life will be brief. Here's the weird thing............with break in settings for the first few tanks, running it at no more than 25% throttle, and so rich it was almost 4-stroking, it would still hit 240*. My other Gladiator with M16 (.16, 1.15HP) runs 265* all day on the same track, and I have it tuned rich as well. No detonation, and it doesn't act like it's overheating at all. Trinity fuel is good stuff right? I'm running 20/12 right now. Would a higher oil content keep it cooler? I do have the temp guage loop set on the bottom rung of the head. Are you basing your temps on infrared on the top of the head? Doc >> Hello again, >> [quoted text clipped - 15 lines] >> >> Doc Oooh. Good question. I am using an IR temp gun. You can also get to a point that too much oil will create greater heat. I would be curious to see your engine temp with a IR device. We could be comparing apples and oranges. Brian >> WOW!!! That is HOT!! If I break 220F I shut down. Look at your head. At >> that temp you should experience detonation. The head will be pitted [quoted text clipped - 41 lines] >>> >>> Doc > Oooh. Good question. I am using an IR temp gun. You can also get to a > point that too much oil will create greater heat. I would be curious to > see your engine temp with a IR device. We could be comparing apples and > oranges. > > Brian I might bump the sensor loop up a few rungs and see how the numbers change. The instructions for the gauge (MIP) state to set it on the bottom rung of the heatsink, but the IR gauges usually measure closer to the head right? For my engine that is rung 3 or so. Thanks for the help thus far. I've nuked engines by overheating before and this one is exibiting none of the signs of overheating. No funky idle, no flameouts, smooth accelleration from a dead stop, nice stream of blue smoke coming from the exhaust, no loss of power as temps increase. Believe it or not, it runs better the hotter it gets and seems to be really happy at 315*. Doc >>> WOW!!! That is HOT!! If I break 220F I shut down. Look at your head. At >>> that temp you should experience detonation. The head will be pitted [quoted text clipped - 43 lines] >>>> >>>> Doc > Hello again, > [quoted text clipped - 15 lines] > > Doc Like I said on the break in posts doc, try different fuel/plug combinations and see what does best for your engine, once you have found a reliable setting stick with that as that is usually where that given engine is happiest unless you have found out different from elsewhere. As for temp gauges.....never used one in 29 years of running engines and am not about to start now...I know by now when an engine is running sweet or not and like I said before.......the cooler the better. I have 2 cars running too fast on nitro engines and 3 £1000+ scale heli's all flying nicely...the engines on the heli's are the most critical and they are all fine so believe me lol !!! (Yes, I can do autorotations but not fun when u are not expecting them !!) ...As for me planes...well they are both happy  SignatureRegards........Mark (BlueWaveStudios) www.scale-models.co.uk (Moderator) Oh yeah I forgot to add.. If you are running a pipe with high back pressure or an exhaust deflector, they will cause higher engine temps from what I have seen.... > Hello again, > [quoted text clipped - 15 lines] > > Doc > Oh yeah I forgot to add.. > If you are running a pipe with high back pressure or an exhaust deflector, > they will cause higher engine temps from what I have seen.... Long, fat pipe, no deflector plate, and a pretty chubby header as well. So, exhaust restriction isn't an issue AFAIK. Gunna grab some O'Donnels and some Sidewinder Cool Power this PM and see if she runs cooler with them. Doc ////////////////////////////////////////////////////////////////////////////////////////////////////// >> Hello again, >> [quoted text clipped - 17 lines] >> >> Doc |
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