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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › OS50 Engine Temp Too Cold??
10-10-2005 04:13 PM  13 years agoPost 1
kozmo

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Madison, WI - USA

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Hi All,

I have a Sceadu 50, OS 50 SX-H, Mavrikk Muffler, running Cool Power 30% I am using a Raytek MT-6 IR temp gauge and am getting readings of around 115-125 degrees F measured at the back of the combustion chamber from about 3-4 inches away (also verified the Raytek is not showing C) after fully warming up after about 5 minutes of flying.

Main needle is 1 1/4 turns out and mixture needle is 10 degrees open from factory default. Outside air temp was 60F. I can hold my finger on the backplate for about 3-4 seconds before having to remove it. Can this be correct? There is a alot of smoke and the engine makes awesome power. Just wondering if the temp gauge is inaccurate.

Thanks.

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10-10-2005 05:54 PM  13 years agoPost 2
airdodger

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Johnston USA

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The head will dissipate heat rapidly in cool air, even by the time you get to check it. If it is running good it must be close. Three to four seconds on the backplate is real close to lean. You want to check the gun, boil some water. Chris

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10-10-2005 05:56 PM  13 years agoPost 3
Al Magaloff

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12,199 Posts- Enough Time Wasted. See Ya!

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Put the Raytek away, and trust your finger. Your Raytek test is flawed. Your finger works as designed.

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10-10-2005 06:02 PM  13 years agoPost 4
airdodger

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Johnston USA

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I agree with Al on this one. Sight, sound and finger together with experience are the best tools. Chris

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10-10-2005 06:14 PM  13 years agoPost 5
kozmo

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Madison, WI - USA

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OK, I got the Raytek because of inexperience with the touch method and engine tuning in general. Would you guys say the engine is running too lean?? Full power climbouts are awesome, tons of smoke, no bogging at the top or cutting out. This is a new engine with approx. 2 gallons through it.

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10-10-2005 06:18 PM  13 years agoPost 6
airdodger

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Johnston USA

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I would say you are close, if there are other experienced heli pilots in the area go see one of them. They could show you more in a few minutes then we could write here in a week. Chris

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10-10-2005 06:37 PM  13 years agoPost 7
kozmo

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Madison, WI - USA

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Al,

I don't understand how a device which is accurate to +/- 3 deg (if used properly) can be seriously flawed and actually less useful than a purely subjective method of measurement? Yes, I believe one can tune engines properly by the use of the touch method (with alot of experience), but for a beginner, how could you argue against an accurate measuring device???

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10-10-2005 11:03 PM  13 years agoPost 8
HGlider

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Durango, Colorado

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One thing I have noticed about the temp gauges is where you point them. I find that holding it as close as possible move the laser pointer all over the head and look for the highest value. The engine reflects alot of it. Try scanning the muffler some time then using the finger method.
Major Pain . Was thinking about painting a black spot on a muffler some time as that sucker gets alot hotter than the engine.

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10-10-2005 11:18 PM  13 years agoPost 9
Butch

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New York

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koz, I have the same Evo with the Same mechanics using the same fuel. Even on a day of brutal heat ( much of the season here in NE), the backplate stayed well within the guidelines via the Fat finger method, even cooler than my 32 or 37!
Maybe due to all the fuel it guzzels?( Have you fogged your plankers today??? ) or...SX-H probably runs cooler than Hyper due to lower power output?

The Whirlybug Bit Me!

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10-10-2005 11:45 PM  13 years agoPost 10
Al Magaloff

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12,199 Posts- Enough Time Wasted. See Ya!

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I don't understand how a device which is accurate
Well Koz, the device may be accurate, but the test is flawed. The only use that tool has, is to be able to get your particular motor back to where you had it, should you change something. Meaning, you use the "finger in the backplate method" ( 100% reliable, by the way). As airdoger said above, sight, sound and touch. You get the moptor running well, then you pull a temp off a particular spot. You use the spot and temp next time , should you change the needles for some reason. My temp and your temp, may be very different. Where you take the reading, when you take the reading, color of the surface, surface finish of the surface, etc, etc. All variables. Trust me, if you stick your finger in the backplate, and the motor is lean, it will hurt. You richen both needles until it doesn't hurt. Then you fine tune while flying. I'm sorry, but experience wins, here.

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10-10-2005 11:56 PM  13 years agoPost 11
BladeRunner

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Ontario Canada. Member of "some sort" s

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I don't care how fast you are with a gun..(raytek).... By the time you can get to it, the engine has already started to cool as soon as the load comes off.
So, by the time you land and "shoot" it.....it's already cooled down some........

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10-11-2005 04:17 AM  13 years agoPost 12
HGlider

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Durango, Colorado

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finger method is great for most people. Except if they are, or have ever been a fry cook

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10-11-2005 09:54 AM  13 years agoPost 13
Al Magaloff

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12,199 Posts- Enough Time Wasted. See Ya!

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Was thinking about painting a black spot
Flat black, for wood stoves, will work best, and hold up longest. Paint a spot on the cylinder head, not the muffler.

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