New Oil Temperature Thread
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
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From: Haslet Texas
Same as I was getting when I was running synthetic and no oil cooler.
Road Captain
Joined: Apr 2016
Posts: 605
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From: Colorado
BTW - Mine runs at 240 - 253 consistently on the dipstick temp. On the FP3 while I was using it to monitor the engine temp sensor last Saturday, it ran at 250 - 266 all day, but I'm not sure where that sensor monitors the temp.
Last edited by Check6; Jul 20, 2016 at 06:38 PM.
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Stellar HDF Member
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From: Texas
Thanks, this all good information, I richened it up last week when I put the 10 to 1 pistons in and after filling it up with gas this morning and getting 34 mpg, I leaned it out in the cruising range, 2000 to 3500 rpms, 15% to 60% throttle, just making sure it wasn't getting to hot.
This is the target AFR for both cylinders for the auto turner
This is the target AFR for both cylinders for the auto turner
Last edited by RLH3175; Jul 20, 2016 at 07:13 PM.
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From: Great State of Canada
FWIW, if you Google some technical info on motor oil viscosity and Temp., you'll find that oils are generally designed to have a viscosity of 10 centiStokes at 212 deg. F (the boiling point of water). This info may serve to provide a rough benchmark for oil temperature normalcy.
We don't want to forget that it is generally acknowledged that air cooled MC engine temps fluctuate more widely than liquid cooled car engine temps so MC oils, which also facilitate some engine cooling, are probably spec'd out with this in mind.
We don't want to forget that it is generally acknowledged that air cooled MC engine temps fluctuate more widely than liquid cooled car engine temps so MC oils, which also facilitate some engine cooling, are probably spec'd out with this in mind.
Last edited by HKMark23; Jul 20, 2016 at 07:11 PM.
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From: Texas
I found this on the Internet
What Is The Optimum Engine Oil Temperature?
Marlan Davis - writer August 29, 2013
For a dual-purpose car, engine oil needs to be at least 220 degrees F to burn off all the deposits and accumulated water vapor. For every pound of fuel burned in an engine, the combustion process also generates a pound of water! If engine sump temperatures rarely exceed 212 degrees (water’s boiling point), the water will mix with sulfur (another combustion by-product) and create acids that can eventually damage bearings.
As for ultimate power potential, the general consensus among most racers is that hot oil and cool water make more power in most engines. Cold engine oil causes excessive frictional drag on the bearings and cylinder walls. A quality conventional motor oil will tolerate oil sump temperatures of up to 250 degrees, but starts breaking down over 275 degrees. The traditional approach is to try to hold oil temperatures between 230 and 260 degrees. Even on a short-duration, drag-only combo where oil is frequently changed, I would not want to routinely see under-200-degree oil temps.
A full-synthetic oil will withstand sump temperatures in excess of 300 degrees, and for hard-core professional racing, some oval-track race teams are experimenting with ultra-thin, specially formulated, race-only synthetics operating at 350 degrees or even higher.
Also remember that a high-end engine is built as a total combination. Piston-to-wall clearances, piston ring end-gaps, and bearing clearances are specifically tailored to match the engine oil’s characteristics and intended operating temperature.
Marlan Davis - writer August 29, 2013
For a dual-purpose car, engine oil needs to be at least 220 degrees F to burn off all the deposits and accumulated water vapor. For every pound of fuel burned in an engine, the combustion process also generates a pound of water! If engine sump temperatures rarely exceed 212 degrees (water’s boiling point), the water will mix with sulfur (another combustion by-product) and create acids that can eventually damage bearings.
As for ultimate power potential, the general consensus among most racers is that hot oil and cool water make more power in most engines. Cold engine oil causes excessive frictional drag on the bearings and cylinder walls. A quality conventional motor oil will tolerate oil sump temperatures of up to 250 degrees, but starts breaking down over 275 degrees. The traditional approach is to try to hold oil temperatures between 230 and 260 degrees. Even on a short-duration, drag-only combo where oil is frequently changed, I would not want to routinely see under-200-degree oil temps.
A full-synthetic oil will withstand sump temperatures in excess of 300 degrees, and for hard-core professional racing, some oval-track race teams are experimenting with ultra-thin, specially formulated, race-only synthetics operating at 350 degrees or even higher.
Also remember that a high-end engine is built as a total combination. Piston-to-wall clearances, piston ring end-gaps, and bearing clearances are specifically tailored to match the engine oil’s characteristics and intended operating temperature.