Head Temps
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Joined: Apr 2012
Posts: 648
Likes: 9
From: WV
All of the temps posted here may or may not be out of alignment with "normal" it just depends on the conditions, there is no simple XXXF temp that can be considered normal across the spectrum of operation but 320+ on the front head is not uncommon, lots of variables that influence temps. At long distance sustained highway speeds of 70+ MPH the CHTs can get just as hot as idling in town.
At about 55 MPH the CHTs will remain much lower because that is about the ideal combination of speed and RPM where the engine is shedding as much heat as its making, above or below it will climb higher.
ET and CHT is the same thing, front cylinder head OEM ET sensor. I'm not sure what the PV is reading as ET and CHT because there is only one sensor in the front head
I wouldn't try to draw any conclusions from IR temp gun reading at the spark plug, especially after shutdown, you can se why by looing at the first graph on the performance charts page I recently published on the website http://www.wardspartswerks.com/new-p...ance-data.html Actually studying the trends demonstrated in the data logged charts can help to explain a lot of what happens with CHTs during operation.
Conventional wisdom regarding Harley temps is mostly inaccurate, I've been studying this subject for several years now and I'm still learning new stuff all the time.
At about 55 MPH the CHTs will remain much lower because that is about the ideal combination of speed and RPM where the engine is shedding as much heat as its making, above or below it will climb higher.
ET and CHT is the same thing, front cylinder head OEM ET sensor. I'm not sure what the PV is reading as ET and CHT because there is only one sensor in the front head
I wouldn't try to draw any conclusions from IR temp gun reading at the spark plug, especially after shutdown, you can se why by looing at the first graph on the performance charts page I recently published on the website http://www.wardspartswerks.com/new-p...ance-data.html Actually studying the trends demonstrated in the data logged charts can help to explain a lot of what happens with CHTs during operation.
Conventional wisdom regarding Harley temps is mostly inaccurate, I've been studying this subject for several years now and I'm still learning new stuff all the time.
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Road Warrior
Joined: Jul 2013
Posts: 1,624
Likes: 13
From: Fort Worth
Jason, thanks for chiming in. If anyone would know what temps are like, you are the one. I would imagine that a 103 would run hotter than your lean tuned 88" but don't know.
I don't know where exactly the PV is different for the temp numbers. I have an email in to Dyno Jet asking the same question as I cannot find an engine temp sensor in my manual. Could be overlooking it but.....
I don't know where exactly the PV is different for the temp numbers. I have an email in to Dyno Jet asking the same question as I cannot find an engine temp sensor in my manual. Could be overlooking it but.....
Road Warrior
Joined: Sep 2008
Posts: 1,465
Likes: 16
From: Nor Cal
I had posted on this thread because after doing a 95" on my '00 it seemed to run hotter. I never measured temps when I had the 88" so I had no comparison except the seat of my pants. I was thinking that I was measuring temps after heat soak. The only stock temp. sensor is in the rear of the front head. My homewerk will be reading the Wards articles.
Last edited by DanDman; May 26, 2014 at 11:05 PM.
Stellar HDF Member
Joined: Jan 2013
Posts: 2,012
Likes: 53
From: Myrtle Beach,SC
Your head temps rise as soon as the motor is shut down for a few minutes. Why don't you use the temp sensor built into the cylinder head and measure with the Power Vision moving down the road. 320 head temp kicks in EITMS. I can tell you in closed loop I run 250 - 260 Cylinder head temp on a warm day while moving down the Interstate. A cool day is 230 - 240. Sitting in traffic or moving slowly around town I used to shoot up over 300. I put Wards Parts fans on it and now I don't ever see over 260.
The fans turn on at 190 degrees. (using the included thermistor) When I shut down the fans run for about a minute turn off than run again for 30 seconds. Meaning my heads are not that hot at all. Even in 95 degrees the fans don;t run a long time after shutdown but always go off then come back on for a shorter time which is consistent with Wards Charts although mine is a 103 and his an 88.
I still only wonder about the fans drawing in hot air being so close to the heat of the jugs. I have put my hand behind the fans and the air blowing is hot across the heads. Much hotter than ambient temps
Last edited by TenMidgets; May 26, 2014 at 11:26 PM.
Ultimate HDF Member
Joined: Dec 2010
Posts: 7,776
Likes: 2,252
From: wet coast BC
Jason, thanks for chiming in. If anyone would know what temps are like, you are the one. I would imagine that a 103 would run hotter than your lean tuned 88" but don't know.
I don't know where exactly the PV is different for the temp numbers. I have an email in to Dyno Jet asking the same question as I cannot find an engine temp sensor in my manual. Could be overlooking it but.....
I don't know where exactly the PV is different for the temp numbers. I have an email in to Dyno Jet asking the same question as I cannot find an engine temp sensor in my manual. Could be overlooking it but.....
Road Captain
Joined: Aug 2008
Posts: 528
Likes: 4
From: Alberta Canada
I was reading a thread that another OP made (https://www.hdforums.com/forum/touri...er-vision.html) and commented that my engine temp runs 250 and head temp at 350 while cruising at 60 and I am using my Power Vision gauges to get these numbers. This is with an air temp in the mid 80s on flat ground. One person responded saying my head temps were way too high so I did some digging on the internet. It looks like most people say that 300 degrees is the right head temp to have.
To double check my numbers, I decided to a quick ride tonight. I never got any faster than 55 and the temp was in the low 70s. According to the PV screen, my engine temp was mid to low 240s and my head temp was 320-330 degrees. When I got home, I grabbed my trusty IR temp gun and read the temps on each head at the spark plug base. The front was 279 and the rear was 326. These temps were taken within 1 minute of shutdown.
Currently, my setup is a 13 FLHTCU with a stage I. I am running a PV with the map that Jamie sent from Fuel Moto. I thought I was running an Auto Tune map but had never loaded on to my PV. I know that timing has a lot to do with temps too. Below is a picture of the AFR table. I've also attached the tune.
What are your thoughts?
ETA: I double checked my oil level just to be sure.... I am good at about 6 dots up from the low end.
To double check my numbers, I decided to a quick ride tonight. I never got any faster than 55 and the temp was in the low 70s. According to the PV screen, my engine temp was mid to low 240s and my head temp was 320-330 degrees. When I got home, I grabbed my trusty IR temp gun and read the temps on each head at the spark plug base. The front was 279 and the rear was 326. These temps were taken within 1 minute of shutdown.
Currently, my setup is a 13 FLHTCU with a stage I. I am running a PV with the map that Jamie sent from Fuel Moto. I thought I was running an Auto Tune map but had never loaded on to my PV. I know that timing has a lot to do with temps too. Below is a picture of the AFR table. I've also attached the tune.
What are your thoughts?
ETA: I double checked my oil level just to be sure.... I am good at about 6 dots up from the low end.
Advanced
Joined: Apr 2013
Posts: 69
Likes: 0
From: Prescott Valley, AZ
Oil Temp
Running 75 mph with an 03 88ci two up and climbing from 5,000 ft to 6300 ft on a 80 degree day, my oil temp hit 255 degrees. Not a miss or knock but it was hotter than I had ever seen in. Is this the normal for those conditions and does it harm the engine? I've read where most say just throw the oil temp gauges away and ride. I would suspect that should you enter the area where you are doing harm to the engine, the engine will tell you with knocks and missing. What's correct?
Thread Starter
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Road Warrior
Joined: Jul 2013
Posts: 1,624
Likes: 13
From: Fort Worth
Please explain how the Powervision monitors both engine temp and cyl head temp? My PV only monitors 1 temp, ET, which I beleive is taken from the cyl head. Mine reads 240-260 in 75-85F while cruising 40-70mph. Ive seen it over 300 on a hotter day stopped at the streetlight. I have since put an oil cooler on as per Fuelmoto's advice.
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I don't think updating my PV is going to do it for me. I have had my engine apart down to the cases and on an '09 the ET sensor is the only one, which is in the front head. Maybe in the '13's they have added a sensor, if so it would be interesting to know where the additional sensor is located. My ET's are in the 270 degree range when cruising at 70+ mph, I have an older set of FCS so they don't do much once the speeds get above 50. They work great in traffic though!