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> Overheating on the highway. 76, 2.0
SVG223
post Jun 5 2022, 10:59 PM
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My 914 overheats on the highway. I had concerns about the air flap, but I think the thermostat has broken and it stays in the open position. I thought something might be clogging the fan but it looks clear. I wonder about the heater air hose that goes over the motor. It could be blocking some air possibly. I may try to tie it out of the way. After exiting the highway and stopping at a stopsign the idle was extremely low, I was surprised it was still running. I turned the engine off for a while and it ran better after it cooled down. Any ideas would be appreciated.
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Superhawk996
post Jun 6 2022, 12:17 PM
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Based on info above I'm more convinced that something isn't right. You should be able to run those speeds, at those ambient conditions all day long without issue.

First thing I would do is verify the part number on the oil temp sender. It's free and easy to do. This at least gets us to a baseline where we know about what temp you're oil really is.

I'm not suggesting that is the problem but it is one of symptoms that got your attention.

Next, I'd get a cheap boreoscope, Amazon, iphone app, whatever. They are pretty cheap.

Make sure you don't have the oil cooler plugged with debris or one of these situations (all 3 came from my own tear down core engines -- 3 of 3 had what would be fatal blockages if you tried to run like this):
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Blocked oil coolers are amazingly common on these older cars and there isn't an easy way to clean them as annual maintenance. The rodent problems are very real for vehicles stored a good part of the year. Likewise, mice can build one of these nests very quickly - just a matter of a few days.

Next up: Verify timing and make sure you're not running with too much advance.

We haven't talked about what you're running carbs or fuel injection. Either way, you need to verify that the fuel system isn't running lean. This can be as basic as reading the spark plugs.

As previously mentioned by others a cylinder head temp gauge on Cylinder #3 is a real good thing to have since head temperatures lead oil temperatures by a wide time margin. By the time you see the oil temp going up, the heads have been hot for a long while.
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SVG223   Overheating on the highway. 76, 2.0   Jun 5 2022, 10:59 PM
Superhawk996   Did it actually go into the red zone? If not then...   Jun 5 2022, 11:38 PM
SVG223   Did it actually go into the red zone? If not the...   Jun 6 2022, 12:17 AM
JamesM   This could be SO many things its hard to find a pl...   Jun 5 2022, 11:39 PM
Superhawk996   This could be SO many things its hard to find a p...   Jun 5 2022, 11:44 PM
SVG223   This could be SO many things its hard to find a p...   Jun 6 2022, 12:28 AM
JamesM   This could be SO many things its hard to find a ...   Jun 6 2022, 02:11 AM
SVG223   [quote name='JamesM' post='3006792' date='Jun 5 ...   Jun 6 2022, 12:40 PM
JamesM   There's a little wear on second gear synchro ...   Jun 6 2022, 09:06 PM
wonkipop   This could be SO many things its hard to find a p...   Jun 6 2022, 02:59 AM
JamesM   i got one of those them there grommets on my engi...   Jun 6 2022, 10:43 AM
wonkipop   i got one of those them there grommets on my eng...   Jun 6 2022, 04:39 PM
Superhawk996   Location? Ambient temperature? Speed driven, wha...   Jun 6 2022, 01:12 AM
SVG223   Location? Arkansas Ambient temperature? 80f Speed...   Jun 6 2022, 11:58 AM
JamesM   My gut (and my eyes with limited pictures) are tel...   Jun 6 2022, 02:25 AM
76-914   As James said that is the oil temp. Porsche actual...   Jun 6 2022, 08:07 AM
SVG223   As James said that is the oil temp. Porsche actua...   Jun 6 2022, 05:50 PM
emerygt350   The other symptoms point to something out of the o...   Jun 6 2022, 09:41 AM
Superhawk996   The other symptoms point to something out of the ...   Jun 6 2022, 09:48 AM
SVG223   The other symptoms point to something out of the ...   Jun 6 2022, 06:18 PM
Chaznaster   The other symptoms point to something out of the ...   Jun 6 2022, 06:56 PM
Superhawk996   Here's the weekly posting of oil temperature g...   Jun 6 2022, 09:41 AM
mgphoto   My 914 overheats on the highway. I had concerns a...   Jun 6 2022, 11:02 AM
SVG223   My 914 overheats on the highway. I had concerns ...   Jun 6 2022, 05:44 PM
wonkipop   [quote name='mgphoto' post='3006885' date='Jun 6 ...   Jun 6 2022, 07:08 PM
emerygt350   Good call. Never even thought about that.   Jun 6 2022, 11:12 AM
Superhawk996   Based on info above I'm more convinced that so...   Jun 6 2022, 12:17 PM
SVG223   Based on info above I'm more convinced that s...   Jun 6 2022, 10:59 PM
brant   Also wanted to ask which front spoiler or valance ...   Jun 6 2022, 01:49 PM
wonkipop   @SVG223 hey thats a good looking car you got hol...   Jun 6 2022, 04:31 PM
emerygt350   1- ODYR/SLX-11-1--BLUE-K - Cylinder Head Temperatu...   Jun 6 2022, 07:37 PM
FlacaProductions   1- ODYR/SLX-11-1--BLUE-K - Cylinder Head Temperat...   Jun 7 2022, 09:32 AM
Chaznaster   1- ODYR/SLX-11-1--BLUE-K - Cylinder Head Temperat...   Jun 8 2022, 05:40 PM
mgphoto   Remove the cat, there is an after market bypass pi...   Jun 6 2022, 10:52 PM
Lockwodo   Don't know if anyone else has mentioned this, ...   Jun 7 2022, 01:37 PM
emerygt350   That's a Porsche/diff type thing. Our fans ar...   Jun 7 2022, 03:11 PM
piscean914   i would start by confirming the oil temp in the su...   Jun 7 2022, 11:59 PM
rhodyguy   Delete/Replace the cat converter and clean the oil...   Jun 10 2022, 07:50 AM
SVG223   I think the ignition timing has been retarded by a...   Apr 9 2023, 06:58 PM
Superhawk996   tried to get it to ping but it didn't so I n...   Apr 9 2023, 07:47 PM
SVG223   tried to get it to ping but it didn't so I ...   Apr 9 2023, 09:51 PM
VaccaRabite   [quote name='Superhawk996' post='3070615' date='A...   Apr 10 2023, 09:44 AM
SVG223   [quote name='Superhawk996' post='3070615' date='...   Apr 11 2023, 10:43 PM
VaccaRabite   I hear no pinging under load I may have guessed ...   Apr 12 2023, 06:24 AM
SVG223   I hear no pinging under load I may have guessed...   Apr 12 2023, 07:27 AM
VaccaRabite   Just clearing out all the crap on top of the oil c...   Apr 12 2023, 11:30 AM
930cabman   Has a "high temperature" ever been confi...   Apr 13 2023, 06:37 AM


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