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08-08-2007 01:27 PM  10 years agoPost 1
chinnook

rrApprentice

Corpus Christi TX​USA

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I hovered my Benzine rc230, (3 gallon,) and put on one of those high tech temperature sense labels that they use on the real hydraulic reservoirs on the UH-60a Blackhawks. I put the label right on the exhaust. The label has 4 dots, each one has a temp range well all turned black and the last on the label is 300 F Should I be concerned? Am I reading the temp at the wrong place? Needles are out at 1 3/8 High and Low. Rene

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08-09-2007 02:17 AM  10 years agoPost 2
helicenter

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Winter Haven Fl.

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temp

HERE ARE THE TEMPERATURE AREAS ON AN INTERNAL COMBUSTION ENGINE ===

EXHAUST GAS TEMP

CYLINDER HEAD TEMP

OIL TEMP (CRANKCASE TEMP)

MY PREFERENCE IS TO LOOK AT CYL HEAD TEMP, IF THATS GOOD THE REST SHOULD BE FINE.

Doug

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08-09-2007 03:04 AM  10 years agoPost 3
FCM

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Surrey, England

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Yes, if the label was on a hydraulic reservior but as it is on your Benzine exhaust I would just take it off and forget about it assuming the engine is running okay?

Paul.

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08-09-2007 03:19 AM  10 years agoPost 4
GyroFreak

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Orlando Florida​...28N 81W

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I have a temp logging device on my zenoah 231 gasser. The upper cylinder runs from 280F to 320F during flight, the lower runs about 10 deg cooler. This is with ambient of 98F (its been hot). The plug looks near perfect. I used to worry this was to high but it seems to be working out good. Exhaust / muffler temp would be a lot lot lot higher.

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I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-09-2007 03:48 AM  10 years agoPost 5
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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Here is a plot of engine temp and rpm as described in my previous post. Also a pic of the plug condition.

Temp is the gray and green lines.. Eng RPM is red.

.
.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-09-2007 01:34 PM  10 years agoPost 6
chinnook

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Corpus Christi TX​USA

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Thank you gentlmen for the infor. The engine is running smooth running ozark with 2.5 amsoil. I was hovering so i must of been using alot of power and I guess the engine RPM must of been up there so that explains the temperature to be in the 290-303 range. Also running a GV-1 so it maintains a steady Rotor RPM. In addition the high humidity and OAT here was 85%/95F. Rene

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08-10-2007 03:08 AM  10 years agoPost 7
Disciple4123

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USA

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In the upper fins of the head, measured with an IR from the bottom of the heli, I generally find the engine temp to be around 160 in the winter and about 200 in 100 degree summer weather. These are approximations.

The PUH engines I've run previously ran about 40 degrees hotter than 230RC class engines that use their own cooling fan assembly.

Exhaust temps are much higher, I do not read them.

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08-10-2007 01:19 PM  10 years agoPost 8
chinnook

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Corpus Christi TX​USA

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IR? Infrared? Does the hobby shop have a device one can use to get a reading on the cynder head? Rene

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08-10-2007 02:18 PM  10 years agoPost 9
FCM

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Surrey, England

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Take my advice, fly the heli as it is. I fly my Benzines at up to 30lbs flying weight in 35C+ conditions and have never owned a temperature gun or probe. I don't know what the engine temp is. If you do find a temp you don't like the look of, what are you going to do about it?

Paul.

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08-10-2007 04:28 PM  10 years agoPost 10
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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I also have an IR gun type, in addition to my data logger which uses thermistor probes mounted deep inside the engine cooling fins. IR guns can be very misleading due to a problem called emisstivity. Alum , or any semi shiny metal will cause reading errors. I never could get a consistant reading with my IR gun, plus the fan shroud covers most of the cylinder head on my engine.

FCM advice is correct, if it's flying good and the plug looks good, it's probably good. As for me, I just love collecting charts and data on my chopper while it's flying. Something about the old engineer in me.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-10-2007 04:35 PM  10 years agoPost 11
FCM

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Surrey, England

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Sorry of that sounded a bit negative so to counter that here is what I would advise everybody who is getting into gassers. Learn to read your spark plug. This will tell you if the engine is running properly and is the main physical indicator for assessing your engine.

The graph that Gyrofreak posted here is very nice to look at but the plug condition is going to be the most important factor. By the way, the plug looks okay to me but I prefer a slighly darker (richer)colour so I know the combustion temp is not too high as I always operate in hot and humid conditions of course.

Each to their own of course but don't get bogged down chasing graphic readouts.

Hope this helps,

Paul.

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08-10-2007 04:41 PM  10 years agoPost 12
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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I just happened to have a pot of boiling water in a stainless steel pot on the stove. The pot is semi shiny on the outside. The IR gun said 102F on the metal surface while the water showed spot on at 211F (gun accuracy +/- 1). So, for metal surfaces like an engine, reading errors with an IR gun can be very large. .

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-10-2007 04:47 PM  10 years agoPost 13
helicenter

rrVeteran

Winter Haven Fl.

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temps

I agree chasing temps can be fun, however like the man said read the plug and go fly, by the way someone needs to collect some data on hard working chain saws.

Doug

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08-10-2007 04:58 PM  10 years agoPost 14
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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helicenter

I could do that. Whats it for ?? If it's for curiosity it goes low on my priorty list.
If you really need the data for a project, let me know the details of what you need.

Paul

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-10-2007 06:29 PM  10 years agoPost 15
chinnook

rrApprentice

Corpus Christi TX​USA

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The reason I asked cuz someone at one time mentioned 225 as being the nominal temp. Good infor close the tread the heli is flying fantastic, just wanted to be sure that I wasnt going to fry my motor.Rene

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