Engine temp vs Oil temp
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Road Captain
Joined: Aug 2008
Posts: 528
Likes: 4
From: Alberta Canada
Engine temp vs Oil temp
If the ET readout on my Powervision says the engine is running at 270 on a 90 degree day(out on the highway), would the oil temperature be actually lower or higher and approx. how much? I don't have an oil temp gauge. The bike runs about 240-250 on a normal 70-80 degree day...the 270 temp indicated seems high for a Stage 1.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
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From: Phoenix '53, '88, '09 Big Twins
The oil temp is going to be different depending on where it is ( ex. oil is sprayed at the bottoms of the pistons).
And I'm not sure where the powervision draws it's data
Most measure oil temp in the pan, which gives an "average". The H-D dipstick with LED display, the in dash oil temp gauge both take the readings from the pan.
Spouse's meat thermometer makes a handy oil temp checker too.
it is easy to fixate on "My oil is hot"--- but keep in mind that the oil is a major contributor to the cooling system- drawing heat away from some of the hottest parts of the motors ( piston undersides, bearings rocker shafts etc.)
So in a way "hot oil" is a good thing and shows that heat is being removed.
Synth oils have a great tolerance for heat--- so use synth in the motor.
and 90ş ain't nuthin' I got 25ş on that today.
Mike
And I'm not sure where the powervision draws it's data
Most measure oil temp in the pan, which gives an "average". The H-D dipstick with LED display, the in dash oil temp gauge both take the readings from the pan.
Spouse's meat thermometer makes a handy oil temp checker too.
it is easy to fixate on "My oil is hot"--- but keep in mind that the oil is a major contributor to the cooling system- drawing heat away from some of the hottest parts of the motors ( piston undersides, bearings rocker shafts etc.)
So in a way "hot oil" is a good thing and shows that heat is being removed.
Synth oils have a great tolerance for heat--- so use synth in the motor.
and 90ş ain't nuthin' I got 25ş on that today.
Mike
Ultimate HDF Member
Joined: Nov 2008
Posts: 6,682
Likes: 12
Subscribed. I just bought an oil cooler for my bike. Mine seems to engage EITMS before some of the guys I ride with but I have different cams. Im hoping the oil cooler will help col things down. Anyone know for certain when the EITMS activates? I was told when head temps reach 235 degrees but that sems a little low.
Thread Starter
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Road Captain
Joined: Aug 2008
Posts: 528
Likes: 4
From: Alberta Canada
The oil temp is going to be different depending on where it is ( ex. oil is sprayed at the bottoms of the pistons).
And I'm not sure where the powervision draws it's data
Most measure oil temp in the pan, which gives an "average". The H-D dipstick with LED display, the in dash oil temp gauge both take the readings from the pan.
Spouse's meat thermometer makes a handy oil temp checker too.
it is easy to fixate on "My oil is hot"--- but keep in mind that the oil is a major contributor to the cooling system- drawing heat away from some of the hottest parts of the motors ( piston undersides, bearings rocker shafts etc.)
So in a way "hot oil" is a good thing and shows that heat is being removed.
Synth oils have a great tolerance for heat--- so use synth in the motor.
and 90ş ain't nuthin' I got 25ş on that today.
Mike
And I'm not sure where the powervision draws it's data
Most measure oil temp in the pan, which gives an "average". The H-D dipstick with LED display, the in dash oil temp gauge both take the readings from the pan.
Spouse's meat thermometer makes a handy oil temp checker too.
it is easy to fixate on "My oil is hot"--- but keep in mind that the oil is a major contributor to the cooling system- drawing heat away from some of the hottest parts of the motors ( piston undersides, bearings rocker shafts etc.)
So in a way "hot oil" is a good thing and shows that heat is being removed.
Synth oils have a great tolerance for heat--- so use synth in the motor.
and 90ş ain't nuthin' I got 25ş on that today.
Mike
I was out riding today...outside temp was 93 and at a steady 50 MPH my Power Vision showed an engine temp of 247. When I got into town it went up to 275. I do have an oil cooler and I use synthetic oil. I don't know what my oil temp is but I know the Power Vision gets it ET from the sensor in the from head. I have the EITMS set to come on at 305 degrees. You can change the setting in Power Vision program on the computer.
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Joined: Jan 2010
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From: earth
Hover, The ET, AKA CHT sensor is mounted in the front head on the top left side outboard of the intake. ET will generally much higher than oil temp during contunuous operation. There is no predictable relationship between ET and OT. I used to think ther was until I saw for myself with my temp monitoring system that measures OT at 4 points in the system and the F/R CHTs. My bike is tuned lean, at 95F running 70 MPH for about 30 minutes, my front ET was 280F while my OT was 220. Pull off the highway to a stop light and the ET will spike over 340 in 3-4 minutes. Shut down for 30 minutes and start back up and the OT will be higher than the ET for a few minutes, the ET/OT also heat up and cool at very diferent rates, so again there is no rule of thumb or correlation between ET/OT to convert one to the other. Also the rear cylinder running hot thing is not as significant as most may think. For the majority of the engines running time the rear cylinder is less than 15F hotter than the front cylinder, only after extended runtime at highway speed will rear cylinder max out at only 30F higher. Best to just get an oil temp gauge if you want to know the oil temp.
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Road Captain
Joined: Apr 2011
Posts: 702
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From: Kawartha lakes, Ontario, Canada
If the ET readout on my Powervision says the engine is running at 270 on a 90 degree day(out on the highway), would the oil temperature be actually lower or higher and approx. how much? I don't have an oil temp gauge. The bike runs about 240-250 on a normal 70-80 degree day...the 270 temp indicated seems high for a Stage 1.
LMAO! Unfortunately some readers will take this as a serious question.
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Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
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From: Phoenix '53, '88, '09 Big Twins
don't worry about it- an oil cooler can help- and it slightly increases capacity- but really.
Look where you live, look where I live.
I have all kinda bikes and cars and they still work, everyday.
parade fan might help if you are sitting close to still, otherwise when moving it may impede cooling air from flowing around the motor.
And--- for those who are really worried, fairing lowers contribute to lower motor and oil temps. The fairing lowers "order" the air and direct it toward the motor.
Think of air as a fluid--- that big dumb rotataing wheel and that fender cause a messy bunch of air which is not smoothly directed at he motor- the fairing lowers help.
on an average day of 105ş my oil was measured 25ş cooler with the lowers on than off, consecutive runs on the same 20 mile piece of hiway.
mike
Look where you live, look where I live.
I have all kinda bikes and cars and they still work, everyday.
parade fan might help if you are sitting close to still, otherwise when moving it may impede cooling air from flowing around the motor.
And--- for those who are really worried, fairing lowers contribute to lower motor and oil temps. The fairing lowers "order" the air and direct it toward the motor.
Think of air as a fluid--- that big dumb rotataing wheel and that fender cause a messy bunch of air which is not smoothly directed at he motor- the fairing lowers help.
on an average day of 105ş my oil was measured 25ş cooler with the lowers on than off, consecutive runs on the same 20 mile piece of hiway.
mike