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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Engine Temps Summer vs. Winter
04-05-2009 01:12 AM  9 years agoPost 1
aadams1278

rrApprentice

Wilson, NC - USA

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For those of you out there that are keeping track of your engine temps for tuning, or using an onboard temp gauge (i'm using the venom micro temp), what is the difference in your temps from winter to summer?

I just got my heli this winter and had it tuned well, and the temps were where i liked them to be. but now my temps are going up.

I just recently lowered my throttle curve because my headspeed was too high after i finished breaking the engine in and the mixture was leaner. then i noticed that my engine was bogging more and temps were higher. now i'm 3 to 4 clicks richer than i was in the winter (backwards from what i would think, shouldn't it be leaner when it's hot?) doing aerobatics lately i have gotten max temps of up to 256 with roughly the same needle settings i had before, and i got a max temp of 236 today after a flight of only 2 minutes of nothing but hovering. this is the temp i was getting after doing 13 minutes of aerobatics about a month ago. i'd like to keep it below the 240 mark if i can, to be safe.

i'm trying to determine if my temps going up are because of the headspeed or just a normal thing that happens when it gets hotter in the summer.

i'm using an OS 50 hyper on a raptor 50 titan with 15% cool power.

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04-05-2009 03:50 PM  9 years agoPost 2
Dilbeck

rrElite Veteran

Springdale Arkansas

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The hotter it gets outside the richer you will go due to the additional cooling needed. Why would you thing you would need to go leaner?

Clint

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04-05-2009 04:44 PM  9 years agoPost 3
P Johnston

rrVeteran

Ann Arbor MI

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you will have to go leaner because there is less oxygen in the warmer air. Not sure why it is getting that much hotter. My engine usually stays the same temp but the needles get richer when it is cold out.

Needle settings?
Are you using a gov?
What head speed?

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04-05-2009 06:35 PM  9 years agoPost 4
aadams1278

rrApprentice

Wilson, NC - USA

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not using a gov...yet
needle setting WAS about 1 turn and 3-4 clicks out, now it's closer to 1 1/4 turns out but the temps are still higher.
headspeed is variable, it's somewhere in the 1800 to 1900 range.

i've got tired wood blades that i plan to swap out in about a week for carbons, i know this is part of the problem.

also, i just changed to using a OS A3 plug from the OS 8, this wouldn't make a difference would it?

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04-05-2009 07:07 PM  9 years agoPost 5
nivlek

rrProfessor

Norfolk England

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If the ambient temperature goes up by ten degrees , the engine temp will do pretty much the same .

At the end of the day , it gets dark .

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04-06-2009 12:22 PM  9 years agoPost 6
AaronJohnson

rrElite Veteran

mason,MI

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also, i just changed to using a OS A3 plug from the OS 8, this wouldn't make a difference would it?
This most definatly would cause a change in engine temps with the same needle setting. By putting in the hotter #3 plug, you have advanced the timing of the engine. This will make more heat. (at the same needle setting.) Generally A3 plug is not the best choice for a heli but I also noticed you are running 15% fuel. I havent played with 15% on a A3 in a heli so I am not sure which plug(A3 or A8) would be the better choice. You would definatly not want to use the A3 for 30% fuel though.

You might try going back to the A8 plug and retuning. You may have "advanced the timing" too much with the hot A3 plug.

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04-06-2009 09:25 PM  9 years agoPost 7
aadams1278

rrApprentice

Wilson, NC - USA

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i'll try that today...everything was working like i wanted it to before the switch.

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04-06-2009 10:28 PM  9 years agoPost 8
airdodger

rrElite Veteran

Johnston USA

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If you opened the needle more you are capable of using more fuel and that will make more power. The hotter the plug the richer mixture you are able to use, that in return will make more power. It will also transition cleaner.

Chris

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04-07-2009 01:45 AM  9 years agoPost 9
David Blain

rrKey Veteran

Mt. Dora, Florida (USA)

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Never used one of those OS #3 plugs either, I use only the Enya #3's, So if you use the hotter plug, your timing is advanced, then you need to richen the main needle to keep up with advanced timing from the plug.
(as onequick96gt said),
So, what I would try is a fresh OS #8 plug, readjust mixture as needed and then monitor temperatures on the fresh OS #8 plug, determine if you like the performance as set, THEN I would, if you choose to re-install the OS #3 plug and set mixtures according to the plugs advanced timing needs.
It will be a couple of clicks richer on the main needle!

Now you can do a comparison of the two plugs and the performance of the two (and temp's they read when tuned correctly)....
You can then decide what you like that suites your flying style..
Remember, getting it in and getting it fired is one thing, your only as good as the exhaust system letting it out!

Man, just don't run that OS Hyper lean, they really hate that!
Ask the bearings, they will talk to you

David Blain
T.O.R.C.H.S. Orlando Member

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