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Tool Talk Discussion Forum

Cylinder head temperature

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Dick

07-22-2004 14:44:10




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How hot (degrees) head temperature can a one or two cylinder, air cooled, engine run without damage?




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Leland

07-26-2004 22:43:02




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 Re: Cylinder head temperature in reply to Dick, 07-22-2004 14:44:10  
dont worry you almost have to plug up blower housing to burn up a small aircooled engine. I change oil every 5-8 hours and wash engine off once or twice a month. never had any problems always start by 2nd pull. Remember most small engines have no oil filter so oil needs changed more often at least it works for me



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Gene Davis (Ga.)

07-23-2004 19:23:02




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 Re: Cylinder head temperature in reply to Dick, 07-22-2004 14:44:10  
O.E.M, paint on the engine block and head if present is usually a goood indication of the heat situation.



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david - OR

07-23-2004 06:19:57




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 Re: Cylinder head temperature in reply to Dick, 07-22-2004 14:44:10  
Air cooled engines in aircraft are run at cylinder heat temps of 400 degrees fahrenheit for extended periods, with a typical "redline" of 500 degrees.



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txblu

07-25-2004 05:55:47




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 Re: Re: Cylinder head temperature in reply to david - OR, 07-23-2004 06:19:57  
Do you have any idea what oil was used in aircraft radial engines before syn. oil? (and viscosity)

Thanks,

Mark



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david - OR

07-25-2004 07:11:34




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 Re: Re: Re: Cylinder head temperature in reply to txblu, 07-25-2004 05:55:47  
Historically, older radial aircraft engines used straight 50 weight mineral oil for anything but arctic and sub-arctic conditions.

In more recent years, 20W-50 and 15W-50 oils bacame available, in mineral and semi-synthetic blends. An "ashless dispersant" formulation is used in lieu of the typical automotive detergent additives. The idea is to avoid combustion chamber deposits that could lead to pre-ignition.

The service record of fully synthetic aircraft oils has not been particularly good. For example, Mobil has withdrawn their synthetic product from this market.

Aircraft CHT is taken from a specific probe boss machined into the combustion chamber area of the cylinder. The rocker box area (where the oil is) runs considerably cooler. Bulk aircraft oil temps run 180 to 210 degrees (F), with a "red line" between 225 and 250 degrees (F).

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txblu

07-26-2004 06:46:03




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 Re: Re: Re: Re: Cylinder head temperature in reply to david - OR, 07-25-2004 07:11:34  
Got me curious now. Will restart post with "OT Aircraft Radial lubrication".

Thanks,

Mark



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txblu

07-23-2004 05:53:46




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 Re: Cylinder head temperature in reply to Dick, 07-22-2004 14:44:10  
Since synthetic oil was mentioned, and your question may be oil related, I only use Mobil 1 15w-50 in my lawn mowers. I change oil once per year and it stays honey colored all year in every machine.

Remaining honey colored tells me that the oil has not broken down due to excessive heat.

Mobil 1 is good to 400F or thereabouts.

Mark



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Gene Davis (Ga.)

07-22-2004 19:18:10




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 Re: Cylinder head temperature in reply to Dick, 07-22-2004 14:44:10  
The air cooled engines will run much hotter temperatures than their liquid cooled cousins. Don't have any exact figures to give you, but would expect that they probably will run as much as 300 degrees Farenhiet. they are very much subject to run higher temperatures as a result of a lean mixture of fuel. LGD



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George

07-23-2004 03:11:42




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 Re: Re: Cylinder head temperature in reply to Gene Davis (Ga.), 07-22-2004 19:18:10  
I would think that the lubricating oil would begin to break down at 300 degrees. I recall from someplace that engine oils are designed for 250 degrees. Synthetics should give you a little higher operating temperature.



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Ron

07-22-2004 15:49:14




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 Re: Cylinder head temperature in reply to Dick, 07-22-2004 14:44:10  
Obviously that depends on the particular engine and the question could best be answered by the compnay that makes it.



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Lil-Farmer

07-22-2004 18:46:41




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 Re: Re: Cylinder head temperature in reply to Ron, 07-22-2004 15:49:14  
Obviously you don't have a clue, Ron! I'll bet T-Bone does.



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JT

07-23-2004 09:32:42




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 Re: Re: Re: Cylinder head temperature in reply to Lil-Farmer, 07-22-2004 18:46:41  
I agree with ya lil-farmer, every time I see this name, ususally it is not to try to help someone, it is usually a smart aleck commet. This is a forum to help people, not be critical of the questions they ask, it is got to the point I do not even want to try to help someone, there is a guy with the name Ron that criticizes peoples attempts to help one another.



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Mguy

07-24-2004 08:21:20




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 Re: Re: Re: Re: Cylinder head temperature in reply to JT , 07-23-2004 09:32:42  
JT, I think you might be reading too much into T-Bone's comments and answers to questions. I've found him to be a wealth of knowledge. Mguy.



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gg

07-27-2004 18:43:13




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 Re: Re: Re: Re: Re: Cylinder head temperature in reply to Mguy, 07-24-2004 08:21:20  
Mguy, I think you misunderstood. He was talking about Ron, not T-Bone. We all know that T-Bone is helpful. It's Ron that has an attitude and a chip on his shoulders.



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Ron

07-23-2004 02:38:52




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 Re: Re: Re: Cylinder head temperature in reply to Lil-Farmer, 07-22-2004 18:46:41  
Obviously you need to grow up and become a man... maybe someday?



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