After reading your post I loaded the images back into my software and did a comparison of temperatures of the two cylinders. I found the highest tempeature in the front cylinder to be 351.8 degrees and the rear 332.9 degrees. A difference of 18.9 degrees. I also reviewed the visible light image and noticed the outer bolts on both cylinders are a different color than the inner bolts on each side of the spark plugs. This finding leads me to believe that at least on my 1200 the outer edges of the cylinders run hotter than the inner areas. It would be interesting to know if this is normal on Harley engines.
This thermography is very interesting. I've only used an infrared gun to get temps...and that mostly on twin cams. I can't think of a single twin cam I've shot that the rear cylinder was not 30-35* hotter than the front.
Still can't figure why your front cylinder is hotter. What ignition is your bike running? Is it possible that the front cylinder has far more advanced timing than the rear?
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Very interesting, thanks for sharing.
Can you do video too? just thinking it would be interesting to see a video of it warming up from a cold start.
Yes I can do video, but the weather here in Wisconsin is like yours. As soon as it warms up a bit I will do that. Until then here is video on youtube showing a Harley engine warming up under Infrared.
11-17-2014, 10:10 AM
