 Engine temps with/without engine lid, Or regular vs. GT |
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| patssle |
 Sep 25 2014, 08:01 PM
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#1
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Senior Member  Group: Members Posts: 981 Joined: 28-August 09 From: Houston, TX Member No.: 10,741 Region Association: None  |
I'm curious if anybody has done some testing of running their /4 or /6 with and without an engine lid. Or maybe regular vs. GT engine lid. Any hard numbers to say if there's a noticeable impact given the low pressure zone over the engine bay.
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| boxsterfan |
Sep 25 2014, 09:28 PM
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#2
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914's are kewl Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California |
No effect on my car in the hot San Ramon summer. Although I think the true reason for overheating on a properly tuned 914/4 2.0L with everything in order (no vacuum leaks, timing, valve job, oil cooler not clogged, nothing stuck in the fan blades, cooling flaps working properly, etc...) is the oil pressure relief system.
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| damesandhotrods |
Sep 25 2014, 10:50 PM
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#3
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Senior Member Group: Members Posts: 568 Joined: 26-September 10 From: Santa Cruz California Member No.: 12,218 Region Association: Northern California |
I’m not convinced that the GT engine cover was done for cooling. I think that it was done to provide sufficient air for the carbs and cooling fan.
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| speed metal army |
Sep 25 2014, 11:11 PM
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#4
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Waiting for the rain to stop... Group: Members Posts: 1,068 Joined: 4-September 10 From: PNW Member No.: 12,137 Region Association: Canada |
Ive driven around with my deck lid open for carb tuning ease and did notice a reduction in time to achieve operating temp. Accidentally left it open and experienced the same thing.
I have 2 GT lids... I should do an actual test. (IMG:style_emoticons/default/idea.gif) |
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| oldie914 |
Sep 26 2014, 12:11 AM
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#5
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Member Group: Members Posts: 102 Joined: 2-May 10 From: Germany Member No.: 11,680 Region Association: None |
In the early 1970's, I lived in Germany and drove a 914/6. The muffler rusted out and I replaced it with a 911 muffler. The rear valence would not fit because of the different angle of the 911 exhaust pipe so I left it off. The car ran noticeably cooler without the rear valence.
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| Dave_Darling |
Sep 26 2014, 12:01 PM
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#6
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914 Idiot Group: Members Posts: 14,984 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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We have seen 914s that ran cooler with no engine lid. I think someone here had done some testing, but I don't remember who or when any more? (Hmm, hopefully I'm not getting that confused with McMark's testing of with/without thermostat flaps.)
It's certainly not a fix for running too hot, but it does seem to help a little. --DD |
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| patssle |
Sep 26 2014, 08:05 PM
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#7
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Senior Member Group: Members Posts: 981 Joined: 28-August 09 From: Houston, TX Member No.: 10,741 Region Association: None |
Nice tip for the rear valence - mine is currently off with the 2-out /6 sports muffler - perhaps I'll keep it that way.
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