Thermostat operation on a six conversion, Still trying to suss out the overheating issue, might be found? |
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Thermostat operation on a six conversion, Still trying to suss out the overheating issue, might be found? |
davebrossi |
Jul 16 2017, 11:20 AM
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#1
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Member Group: Members Posts: 52 Joined: 6-December 11 From: Idaho Falls, Idaho Member No.: 13,868 Region Association: None |
I tried very hard to get my 914 to Parade, but no matter what we tried, I couldn't stop the motor from reaching temperatures of doom. While I did make it to Parade, the car did not. While there, the theory arose that maybe the thermostat on the 6 had stopped functioning correctly. I just pulled it, cleaned it up, and carried out a boiling test. Hoping someone might be able to tell me if it's functioning correctly or if this is the source of the obstruction to oil flow.
Also worth noting, the 'warm up' time it took to reach 210 was 15-30 minutes. Anyhow, picture time! (IMG:style_emoticons/default/piratenanner.gif) The following four photos were at 'boiling' (212 at least) At partial cool down (within five minutes of removing the thermostat from boiling water) As an addendum; I have a laser thermometer so I had plenty of fun chasing after various temperature readings. I do not have the traditional 911 front mounted oil cooler (and the second thermostat associated with it) and opted for a simplified aux oil cooler with switch controlled electric fan. The difference in temp between oil entering and leaving the aux cooler is significant, I do not believe the car is unable to cool oil in normal conditions, but something changed when I dropped the motor. I've checked all the external oil lines and nothing appears wrong. No lines are touching the exhaust headers, and to test the theory that I had installed the engine rubber with gaps I made certain to seal every stretch off with high temp tape before a run. No change. |
davebrossi |
Aug 6 2017, 08:20 PM
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#2
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Member Group: Members Posts: 52 Joined: 6-December 11 From: Idaho Falls, Idaho Member No.: 13,868 Region Association: None |
Well, if you'll permit me to resurrect this thread, I do have an update to report; I've replaced the Thermostat and O-ring with a new OEM unit, and at the same time I had the shop that made my original stainless steel braided line make a new one but reuse the fittings off the old. The result? Pretty much unchanged. At freeway speeds (out here it's 80 MPH) it doesn't take long for the temp to spike up to 240. A trip of about 15 miles and you're there. Just like before however, here's the kicker;
After pulling off and letting the car run at a slower speed, I switched on the Aux oil cooling fan, and lo and behold with some distance and gentle driving (I consider that nothing above 50 mph keeping the RPMs at less than 3500) the temperature went down. I now have a car that I can drive through town and never go above 215 with aux fan running. It's not 'fixed' but at least locally I can go out and about. So to recap; Thermostat is new, no change Suspect oil line is changed, and secured above the exhaust header by no less than 1.75 inches. I changed the rubber seal around the engine tin and I have left duct tape in place for the purposes of ruling it out only. Oil in it now and filter have less than 200 miles on them. The aux oil cooling system installed worked flawlessly until I dropped the motor, so I still wonder what on the top of the motor I could have disconnected to cause this. I'm still thinking there is something I missed. |
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