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Join Date: May 2006
Location: Rocklin, CA
Posts: 803
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engine oil cooler thermostat
I've been searching through the archives, but I am still not clear on something: I assume that when the external oil thermostat allows oil to flow through the loop this indicates that the internal engine oil cooler thermostat works as well. Is this correct?
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05-27-2007, 10:20 PM
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Join Date: Dec 2005
Location: Rancho Cucamonga Ca
Posts: 361
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I was told by Chuck Moreland from Elephant Racing this is not true. External thermostat works separately from the internal thermostat. One way to check if the internal one is working is to running the engine until normal operating temps and hold your hand CLOSE to the engine oil cooler(just in front of the bottom right valve cover). The cooler should be really hot. If it is not, the internal thermostat is not opening.
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'75 911S Silver Anniversary #164(Formerly JTO's) Rebuilt 2.7 with full ARP, 9:1 CR. SSI, GHL, ER polybronze bushings, finned oil lines. Lowered and corner balanced. CIS retired, now PMOs! '65 912 slate gray sunroof (driving project) |
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05-28-2007, 06:47 AM
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Location: Rocklin, CA
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In other words does oil have to go through the engine oil cooler before it can flow to the external thermostat? I'm trying to figure out if the internal oil cooler is functioning properly. The external thermostat definitely works, for the lines and fender cooler are hot to the touch.
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05-28-2007, 06:48 AM
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Thanks for the input. I'll try that trick.
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05-28-2007, 06:50 AM
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Quote:
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06-08-2007, 01:51 PM
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Location: Arapahoe County, Colorado, USA
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The biggest difference is the two thermostats operate in the two different oil flow circuits.
The engine mounted thermostat and cooler are in the engine pressure circuit. This is after the oil has been returned to the oil tank. This contains almost 100% oil with little entrained air. The front cooler and related thermostat/pressure relief valve (common from ’74 and ’69-’72 911S. The ’73 didn’t have the pressure relief) are in the scavenge oil circuit and has the hottest oil (and gets hot first). This contains about 40% entrained air which reduces the oil/air heat transfer efficiency to the environmental air in the front cooler. The oil temperature sensor (what you see on the instrument) is after both coolers. This is at the lowest temperature point in the entire 2-stage system. 2˘ Best, Grady
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06-08-2007, 04:53 PM
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