 Temp Gauge - Numbers? |
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| AndrewBlyholder |
 May 17 2022, 12:39 AM
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#1
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Member  Group: Members Posts: 112 Joined: 20-September 04 From: Richmond, CA Member No.: 2,791  |
It's always been a pet peeve of mine that there are no numbers on the 914 temperature gauge. I want to know the actual temperature the engine is running at, dammit!!
Someone's probably already posted this years ago, but I wanted to do it for myself, so while I have my motor out and I'm rebuilding it, I set up a test rig and to measure the temperatures through the entire range of the gauge. My measurement device was a new candy thermometer that I can read to within 1 deg. F. It didn't come with any specification for it's accuracy, but I figured it would be within a degree or two and that's plenty good enough for this job.  And here's what I came up with:  The scale isn't at all linear. It's much compressed at both the bottom and the top. As we all probably knew, you should be running with the needle mostly straight up and down. What was news to me was just how bad things are getting if you get anywhere close to the red zone. The start of the red bar is 320, the middle is 350, and the upper end is 400. So it you get to the red, time to switch it off immediately! Attached is a PDF of my gauge overlay for your own use. Hope this is helpful or of interest to others. Anyway, I had fun doing it. Andrew B. 
914_Oil_Temp_Gauge_Markings.pdf ( 11.56k )
Number of downloads: 94 |
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| mihai914 |
May 17 2022, 06:37 AM
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#2
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Senior Member Group: Members Posts: 800 Joined: 2-March 05 From: Montreal, QC Member No.: 3,697 Region Association: None 
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From another thread.
Attached thumbnail(s) 
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| Superhawk996 |
May 17 2022, 06:50 AM
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#3
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914 Guru Group: Members Posts: 7,028 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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As long as this is a means to help convince others to give up on trying to run air cooled engine oil at 180F or 190F I say job well done. (IMG:style_emoticons/default/laugh.gif)
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| Retroracer |
May 17 2022, 07:12 AM
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#4
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Senior Member Group: Members Posts: 640 Joined: 7-July 13 From: Bend OR Member No.: 16,100 Region Association: Pacific Northwest
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Andrew - thx for posting the results and the PDF. It might be good to add the part numbers of both the sender and the gauge used in the test for future reference?
- Tony |
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| mgphoto |
May 17 2022, 11:18 AM
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"If there is a mistake it will find me" Group: Members Posts: 1,375 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
Art supply stores have white rub on numbers on sheets with different font sizes. That’s how I did mine 25 years ago, an article in the Panorama magazine, probably in the upfixin series.
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| FlacaProductions |
May 17 2022, 07:35 PM
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#6
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Senior Member Group: Members Posts: 1,914 Joined: 24-November 17 From: LA Member No.: 21,628 Region Association: Southern California
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Nice work - I'd second the motion to add which sender and gauge part numbers you used.
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| AndrewBlyholder |
May 17 2022, 09:44 PM
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#7
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Member Group: Members Posts: 112 Joined: 20-September 04 From: Richmond, CA Member No.: 2,791 |
Gauge is VDO 310.274/076/001, 12V, made in 12/73
Sender is VDO, 6-12V, 200 deg. C, 801/7/2, made in 10/73 For all engines, water is constantly being added to the oil by the blow-by as a product of combustion. So you need to be running your oil hot enough to be driving out the water and not allowing it to accumulate. That means 210 to 220. 180 to 195 is just plain too cold, I.M.H.O. Andrew |
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| emerygt350 |
May 18 2022, 06:12 AM
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Advanced Member Group: Members Posts: 2,883 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Yeah, people always talk about getting the engine warm to clean the plugs but really you need to do it for your oil. Everytime I drive I try to get it up into the 220s. Much easier on the mustang vs the 914.
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| FlacaProductions |
May 18 2022, 10:09 AM
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#9
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Senior Member Group: Members Posts: 1,914 Joined: 24-November 17 From: LA Member No.: 21,628 Region Association: Southern California
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QUOTE(AndrewBlyholder @ May 17 2022, 08:44 PM)  Gauge is VDO 310.274/076/001, 12V, made in 12/73 Sender is VDO, 6-12V, 200 deg. C, 801/7/2, made in 10/73 Andrew Excellent - thank you |
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