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View Poll Results: Cylinder Head Temp, What is too hot
350 deg F 24 32.88%
400 deg F 19 26.03%
450 deg F 19 26.03%
somewhere over 500 deg F 11 15.07%
Voters: 73. You may not vote on this poll

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  #21  
Old 13th July 2010
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I own a 64 Corvair and head temperatures are critical to the life of the old girl. It runs around 300-350F. The sensors for the temp are actually washers for the spark plugs.

The result that head temps are lower at idle is interesting and I wonder if it is true. I know that sitting at idle, the engine heats pretty good. Maybe that's jug heat (no pun intended) I feel down under but there is no doubt the bike builds heat at idle. When you pull away from a long stop light, feel your oil tank, it will feel much hotter. No doubt the oil is pretty hot as it returns to the tank as the flow increases.
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  #22  
Old 13th July 2010
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Typical exhaust gas temperature at full throttle is in the range of 1200F for a wide variety of engines. Actual peak combustion temperatures are much higher, but don't last very long, so it's hard to tell the effect on head temperature. Temperature at the tip of the fin will naturally be less than at the base of the fin. Then you have the oil spraying in the rocker box and running down the passage in the head and cylinder. The head temperature depends on where you are measuring and what the recent load on the engine is.
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  #23  
Old 6th April 2014
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I have a question, you said you redid the head... did you redo the rings at the same time?

If so what was your break in procedure?

A fresh ring or ring and piston job will net you much higher temps during break in and it will reach those higher temps fairly quickly. This is why I do short heat cycles and watch (feel) the head and cylinder temps closely during break in.
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  #24  
Old 6th April 2014
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I think its much ado about nothing, these are air cooled engines. Its like the dreaded oil pressure gauge, its always lower than you think it should be, but flow is good, so no problems. Just something else to worry you unnecessarily. Just my opinion.
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  #25  
Old 6th April 2014
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first i've,heard of the rear cylinder running hotter. the front cylinder has alway's been mentioned.
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  #26  
Old 6th April 2014
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I'm of the belief the rear runs hotter as well-

I've seen "motorcycle math" and opinions both ways- and feel it comes down to particular bikes
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  #27  
Old 6th April 2014
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Quote:
Originally Posted by trappnman View Post
I'm of the belief the rear runs hotter as well-

I've seen "motorcycle math" and opinions both ways- and feel it comes down to particular bikes
Vincents run colder on the back cylinder, almost always. The factory figured that it was because the rider's legs funneled a bunch of air past the rear cylinder.
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  #28  
Old 6th April 2014
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Quote:
Originally Posted by barefoot View Post
Vincents run colder on the back cylinder, almost always. The factory figured that it was because the rider's legs funneled a bunch of air past the rear cylinder.
rubs the hair on my chinny chin chin...


sounds reasonable.....
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  #29  
Old 6th April 2014
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hmmn- what if you have forwards? then the funneled air, would be right ON the front jug
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  #30  
Old 6th April 2014
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Quote:
Originally Posted by trappnman View Post
hmmn- what if you have forwards? then the funneled air, would be right ON the front jug
In this case you would put one leg forward and one leg back to even it out. LOL
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