Thermostat operation on a six conversion, Still trying to suss out the overheating issue, might be found? |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Thermostat operation on a six conversion, Still trying to suss out the overheating issue, might be found? |
davebrossi |
Jul 16 2017, 11:20 AM
Post
#1
|
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. |
gereed75 |
Aug 7 2017, 04:34 PM
Post
#2
|
Senior Member Group: Members Posts: 1,259 Joined: 19-March 13 From: Pittsburgh PA Member No.: 15,674 Region Association: North East States |
I'll mention this only because it has not been mentioned. I am not sure how timing is controlled on motronic, but advanced timing will definitely increase CHT which will increase oil temp. And maybe this is another variable that could have changed since engine ran cool
|
porschetub |
Aug 8 2017, 10:02 PM
Post
#3
|
Advanced Member Group: Members Posts: 4,705 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
I'll mention this only because it has not been mentioned. I am not sure how timing is controlled on motronic, but advanced timing will definitely increase CHT which will increase oil temp. And maybe this is another variable that could have changed since engine ran cool Motronic has most of that covered,never go's lean just rich if an issue,possibly issue with the distributor,is it firing on all 12 plugs ?,however my experience with early 3.1 so I could be well wrong. The 914 gets more inward air than the 911 so this one is strange ,as asked has the OP lifted the fan shroud to check for crap around the cylinders,really important for good cooling. The 964 is known to have oil leaks around the cylinders that could well cause lots of crap around the cylinders,just saying. |
Lo-Fi Version | Time is now: 8th June 2024 - 02:11 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |