Cylinder Head temperatures
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Cruiser
Joined: Mar 2008
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From:
Cylinder Head temperatures
You guys with the infared thermometers...What temps are you seeing in the summer heat..Im running a 07 RK...Measuring between the sparkplug and headbolt on the rear cylinder IM getting +/- 300 degrees intake side and 345 on exhaust side on a 98 degree day..Bike runs fine, no ping and all that...just curious..
6th Gear
Joined: Jun 2010
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Ditto head temps
Measured mine right after a GOOD ride, highway speeds( no I never ride on highways !!) and measured immediately after stopping ..
Reading at exhaust port on head with a digital probe..362 ....Will try at spark plug tomorrow...
I run a Power Commander , K&N Filter , V&H pipes..Haven't measured after I installed Power commander , hope I lose a few
Reading at exhaust port on head with a digital probe..362 ....Will try at spark plug tomorrow...
I run a Power Commander , K&N Filter , V&H pipes..Haven't measured after I installed Power commander , hope I lose a few
Elite HDF Member
Joined: Apr 2006
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From: The Burgh
On my 09 Ultra, the ECM is programmed to shut the rear cylinder off when the temp in the front cylinder head reaches 285F. My rear cylinder shuts off after idling in high external temp for several minutes, like in stop and go traffic.
If you guys read 362F after riding at highway speed, methink you're not measuring the cylinder temp where it should be measured, or you should get a more accurate thermometer.
Measure where the front cylinder heat sensor is located and tell us what you get.
If you guys read 362F after riding at highway speed, methink you're not measuring the cylinder temp where it should be measured, or you should get a more accurate thermometer.
Measure where the front cylinder heat sensor is located and tell us what you get.
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Joined: Nov 2008
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I have a good infrared thermometer that I have been using to measure temperatures on my touring bike for two years now. I can tell you that the readings I get are pretty inconsistent. The problem is the black paint and silver engine parts being in close proximity, I can say with certainty that there is a pretty big difference between the front cylinder and the rear cylinder. In summer riding temperatures I can usually see about a 30-40 degree difference in shooting identical locations on both cylinders, Of course the front cylinder which gets all the cooling will always have the coolest temperaturers. The highest temperatures are always right around the exhaust port. None of these temperatures have any real relevance other than to cause false alarms in the minds of most people. Air cooled engines are supposed to run hotter than water jacketed engines. I pay much more attention to the temperature of the oil circulating in the crankcase. On a hot summer day, cruising at 70 mph, I will typically see 270-285 degrees on the oil temp gauge. If you are using a good quality full synthetic oil (any brand) you are well within comfortable tolerances regarding oil breakdown. Keep in mind that if you have an air cooled engine and it starts to get to the critical melt down point due to high operating temperatures you will begin to get misfiring and pinging as the first warning sign that something is wrong. If allowed to continue you will begin to see and smell smoke coming off the gaskets and engine case. This situation is indeed rare but if you should encounter it pull over and let that puppy cool off before you continue. The only times I have seen this extreme overheating take place was in the city during stop and go traffic situations in the dead of the summer. It is rare but it can happen. If it happens, either pull over or get it moving.
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Cruiser
Joined: Mar 2008
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From:
There seems to be little difference in cyl temp regardless of ambient temps...if its 60 degrees out the rear cyl is about 300 degrees, if its 100 degrees out the rear cyl temp is 330 degrees on average...this is after a good run all day or just an hour,..I use syn oil and with the infared on the bottom of the motor and oil pan is around 220 degree, I use an oil cooler ..from the feed back on this subject looks like im running normal temps.. I agree with retrop trying to get an accurate and consistent temp reading is impossible..
PCIII
SE Air
Supertrapp 2 into 1
PCIII
SE Air
Supertrapp 2 into 1
Last edited by 60wt; Jul 27, 2010 at 12:31 PM. Reason: forgot info
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