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#1
07-06-2009, 04:18 PM
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Re: one cylinder running colder than the rest.....
------It could be a ring, but wouldnt that plug be oiled up???.......Bill S
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#3
07-06-2009, 05:13 PM
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Re: one cylinder running colder than the rest.....
What intake and carb?
Assuming this was 100° at idle? How does the plug look on the cool cylinder?
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#4
07-06-2009, 05:16 PM
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Re: one cylinder running colder than the rest.....
If there are other problems, such as a miss, exhuast smoke, ??? then you may have a problem, but 100 degrees does not sound like much to me. The reason I say this, the amount of fuel or lack of it each cylinder receives affects the temp, which means for all cylinders to be the same temp, the carb/intake would have to be suppling the same amount to all cylinders, which is is ideal, but nearly impossible, especially at idle.
Besides fuel, the other thing that can easily affect temps is valve settings. We check temps, but are looking for a "cold" pipe, which means a cylinder is not firing. As long as they are all heating up, and no other problems, good to go.
__________________
Tom Clary
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#5
07-07-2009, 12:49 AM
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Re: one cylinder running colder than the rest.....
[ QUOTE ]
If there are other problems, such as a miss, exhuast smoke, ??? then you may have a problem, but 100 degrees does not sound like much to me. The reason I say this, the amount of fuel or lack of it each cylinder receives affects the temp, which means for all cylinders to be the same temp, the carb/intake would have to be suppling the same amount to all cylinders, which is is ideal, but nearly impossible, especially at idle.Besides fuel, the other thing that can easily affect temps is valve settings. We check temps, but are looking for a "cold" pipe, which means a cylinder is not firing. As long as they are all heating up, and no other problems, good to go. [/ QUOTE ] I agree with this post! If you were racing it and wanted to run right on the egde of lean,and that 100 degrees brings you over the top.then i would investigate. If you just cruise and the car runs great with no other apparent problems i think your good to go. 100 degrees doesnt seem alarming....
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1969 rs/ss 396 350hp/4spd conv 1968 Z/28 crossram- j/l8 conv 1963 nova ss 350/4spd conv
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#6
07-07-2009, 01:01 AM
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Re: one cylinder running colder than the rest.....
Ditto..
Motion would occationally use a colder or hotter plug in different cylinders to try and even things out...when racing...
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#7
07-07-2009, 01:19 AM
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Re: one cylinder running colder than the rest.....
Yep..forgot about plug heat ranges affecting things. I learned that with single cylinder 4 stroke go-kart racing.
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Tom Clary
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#8
07-07-2009, 02:02 AM
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Re: one cylinder running colder than the rest.....
Thanks for all of the replies; the car runs fine I just wanted to make sure this wasn't something I should address right away.
For those that asked; it has the stock cast iron intake and Quadrajet carb. The plugs have just been changed but, I am not so sure about the wires or distributor cap.
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#9
07-07-2009, 04:02 AM
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Re: one cylinder running colder than the rest.....
[ QUOTE ]
Yep..forgot about plug heat ranges affecting things. I learned that with single cylinder 4 stroke go-kart racing. [/ QUOTE ] Tom, I doubt the plug heat rating will affect the combustion temp. It will affect how long it lasts before melting or fouling. I think that changing a plug heat rating in a cylinder is just a compensation for the heat of that cylinder; not a method of changing the heat in that cylinder. JMO Verne 
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