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. |
Jeff Hail |
Aug 7 2017, 07:30 PM
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#2
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Senior Member Group: Members Posts: 1,141 Joined: 3-May 07 From: LA/ CA Member No.: 7,712 |
Does this conversion have an 02 sensor. Going back at your photos I'm not seeing one or a bung anywhere. May be obscured by the exhaust?
I've seen some bad Mahle filters that did not flow. Try changing it out for another. |
earossi |
Aug 7 2017, 08:41 PM
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#3
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Member Group: Members Posts: 210 Joined: 8-December 11 From: Chicago, Il Member No.: 13,878 Region Association: Upper MidWest |
Does this conversion have an 02 sensor. Going back at your photos I'm not seeing one or a bung anywhere. May be obscured by the exhaust? I've seen some bad Mahle filters that did not flow. Try changing it out for another. The engine has a single O2 sensor tied to the DME. We started out with a Mobil 1 oil filter; but in trying to address the over heating, we swapped it out for a Mahle which did nothing to address the oil temps. I'm beginning to suspect the the oil always ran this hot and that was masked by a temp sensor that read low. |
Justinp71 |
Aug 7 2017, 10:31 PM
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#4
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Senior Member Group: Members Posts: 1,584 Joined: 11-October 04 From: Sacramento, CA Member No.: 2,922 Region Association: None |
Does this conversion have an 02 sensor. Going back at your photos I'm not seeing one or a bung anywhere. May be obscured by the exhaust? I've seen some bad Mahle filters that did not flow. Try changing it out for another. The engine has a single O2 sensor tied to the DME. We started out with a Mobil 1 oil filter; but in trying to address the over heating, we swapped it out for a Mahle which did nothing to address the oil temps. I'm beginning to suspect the the oil always ran this hot and that was masked by a temp sensor that read low. Is there an oil cooler on the motor and also an auxiliary one? If so it should be able to keep under 200f, per other 3.2s I've seen. |
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