Front cylinder running hotter then rear?
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Cruiser
Joined: Oct 2007
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Front cylinder running hotter then rear?
Any ideas why my front cylinder is running about 20-40 degrees hotter then the rear? \\; It should be just the opposite. \\; This is on a 08 Fat Bob.
 \\;
Thanks for any help!
 \\;
Thanks for any help!
Outstanding HDF Member
Joined: Jul 2007
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From: Indy area
RE: Front cylinder running hotter then rear?
I was hoping for more specifics and hate to have to do this...
Is perhaps your reading on the front cylinder on the exhaust side of the sparkplug and the reading on the rear cylinder on the intake side of the sparkplug?
Is perhaps your reading on the front cylinder on the exhaust side of the sparkplug and the reading on the rear cylinder on the intake side of the sparkplug?
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Cruiser
Joined: Oct 2007
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RE: Front cylinder running hotter then rear?
Glens, at the risk of admitting my ignorance, yes, my measurements were taken to the left of the spark plug on both cylinders. \\; Which means it was on the exhaust side on the front cylinder and the intake side of the rear cylinder. \\; I'm assuming from your line of questioning that the exhaust side will be hotter. \\; Now I have to recheck my readings making sure I'm on the same side (in relation to the exhaust) of each cylinder. \\; I'll let you know.
Thanks! \\;
Thanks! \\;
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Outstanding HDF Member
Joined: Jul 2007
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From: Indy area
RE: Front cylinder running hotter then rear?
Try to achieve perfect symmetry with the gun in relation to the cylinders, too.
I like to line the gun up along the cylinder bore axis and get a reading from the base of the sparkplug. The reading will be affected by stuff behind the target spot, if there is any, so take that into consideration.
I like to line the gun up along the cylinder bore axis and get a reading from the base of the sparkplug. The reading will be affected by stuff behind the target spot, if there is any, so take that into consideration.
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Thread Starter
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Cruiser
Joined: Oct 2007
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RE: Front cylinder running hotter then rear?
Glens, you were correct! \\; If I measure at the correct point on both cylinders the front jug is usually about 10 degrees cooler.
I'm an idiot.
 \\;
Thanks!
I'm an idiot.
 \\;
Thanks!
Outstanding HDF Member
Joined: Jul 2007
Posts: 2,609
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From: Indy area
RE: Front cylinder running hotter then rear?
10 degrees is less of a difference than I have seen. Usually at least 30 unless just coming up to temperature. Using Fahrenheit scale.
You should stop by the thread in the Electrical/Ignition/Tuner/ECM/Fuel Injection forum where they are talking about the Nightrider O2 IEDs. They were taking measurements much like you were. I tried to tell them about that and much more. They do not want to hear it...
You should stop by the thread in the Electrical/Ignition/Tuner/ECM/Fuel Injection forum where they are talking about the Nightrider O2 IEDs. They were taking measurements much like you were. I tried to tell them about that and much more. They do not want to hear it...
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