| Have a Question Regarding Oil Temp vs Coolant Temp [message #66186] |
Mon, 30 November 2009 20:31  |
larry.whisler
Messages: 356
Registered: August 2005
Karma: 8
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How does the oil temp compare to the coolant temp when the engine has reached normal operating temperature and not under excessive load? As in cruising down the highway on an 80 degree day or in city driving at a stop light?
Just wondering how much of a difference is observed.
larry whisler
76 glenbrook
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| Re: Have a Question Regarding Oil Temp vs Coolant Temp [message #66254 is a reply to message #66186] |
Tue, 01 December 2009 10:10  |
Neil
Messages: 271
Registered: July 2007
Location: Los Angeles and Magalia, ...
Karma: 1
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It can be very different depending on where you measure. With a sensor tee'ed off the oil out to cooler line above the filter, just below the headers, temps ran scary high, like 260 and more.
With the same sensor relocated on the same line but near the radiator, the temps dropped way down. Tops I ever saw was 240 on a very hard uphill pull with a trailer.
Measuring the temps on the line out from the radiator oil cooler, (the other line) at least this week, the oil has been cooler than the water.
I think the early 260 readings were in part radiated heat from the headers. Before I figured that out, and relocated the sensor, I went crazy with now unnecessary oil coolers.
From what I have seen, water temps rise first as the thermostat does its job. Oil temp is more related to load. Pulling a trailer over a grade for me resulted in oil temps leading the water temps, if that makes sense.
Still working on it.
Neil
76 Eleganza now sold
Los Angeles
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| Re: Have a Question Regarding Oil Temp vs Coolant Temp [message #66277 is a reply to message #66254] |
Tue, 01 December 2009 14:02 |
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WD0AFQ
Messages: 7111
Registered: November 2004
Location: Dexter, Mo.
Karma: 207
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Neil, makes lots of sense. As most know, I monitor everything but the wheel bearings and the oil. I had wanted to monitor the oil but could never get a good answer to my questions. I have an RX-7 cooler with a 175 degree thermostat in it. I find that it rarely opens unless it is a hot summer day. I have it in line after the aluminum radiator. I would like to have a sensor somewhere in the network but not sure where to put it. On the vdub I have one and it never gets above 200, realizing these are two completely different setups. That temp is in the pan, on a hot summer day. Don't know how accurate the reading is but I think not far off. Maybe you can email me with some of the stuff that you have done. I would appreciate that as not to tie up the thread here, with lots of details.
Thanks,
Dan
gregg_dan at hotmailcom
3 In Stainless Exhaust Headers
One Ton All Discs/Reaction Arm
355 FD/Quad Bag/Alum Radiator Manny Tran/New eng.
Holley EFI/10 Tire Air Monitoring System
Solarized Coach/Upgraded Windows
Satelite TV/On Demand Hot Water/3Way Refer
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