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Model Forum / Radio Controlled / Land Models / May 2005Cylinder head temps
Howdy, Got a question about cylinder head temps......................what temp range is considered healthy? What temp is generally the point where you kill the motor and let it cool down? I have MPI temp gauges on both trucks (Megatech Gladiators) and am constantly watching the temps. Truck 1: Runs 230-250 normal driving on a 75* day, 270-275 if I'm really on it for a few minutes. Will drop and hover around 200 if I let it sit and idle for a few minutes I have both needles set a little rich for extra lubrication and am running Trinity 20/12. Motor is a Megatech M16. Truck 2: Just got the new motor and have ran 1 tank thru it per break-in instructions. Instructions say do not exceed 230* during break-in, but does not specify max temps post break-in. Same kind of truck, Megatech Q1.6 motor, same fuel. I have heard in the past that 300* is generally the point where you consider the motor to be "overheated" and kill it. Is this correct? Doc > I have heard in the past that 300* is generally the point where you consider > the motor to be "overheated" and kill it. Is this correct? I'm learning about engines and have four different vehicles with four different engines. Each manufacturer gives a different answer. Almost all of them say an infrequent overheating isn't problematic. >> I have heard in the past that 300* is generally the point where you >> consider [quoted text clipped - 4 lines] > > Almost all of them say an infrequent overheating isn't problematic. The question still stands, what is generally considered "overheated?" 250? 275? 300? 350? Doc > The question still stands, what is generally considered "overheated?" 250? > 275? 300? 350? > > Doc It depends entireley on the make of engine, but rule of thumb is see how fast spit or a drop of water boils off the engine. If it spits / pops and boils away within a second or three then it's too hot, it should boil away over about 10 to 15 seconds. The final temperature of a properly tuned engine varies depending on many variables such as construction, materials, air temperature, humidity, size of heatsink, ammount of air flowing over the head etc. The .25 1/8 engines that I tune regularly run anywhere between 95 to 110 celcius (203-230F) depending on the make, track length and tightness and weather etc. etc. During run-in we tend to keep them rich and smokey and just check the temp is below about 80 celcius (180F) until about 7 or more tanks have been through the engine. I find the best way to get an engine tuned is to do it by eye and ear, start rich so that the engine sputters then lean it out so it pulls cleanly without being too lean (you can tell that point 'cos the engine will almost stall on acceleration) all the time keeping an eye on the smoke trail. If the engine pulls cleanly from a standstill even after a long full speed run then it's rich enough. Don't do this by doing long full speed runs then stopping dead and returning in the opposite direction that's one of the best ways to overheat an engine, you'll probably end up over richening the engine tuning it that way so that you have trouble idling and starting when cold. Chris |
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