You guys could save a lot of time. and experimentation by installing a quality oil thermostat. Pick your target temperature, buy a T-Stat for it and be done.
Here is a very nice, small high flow billet unit, click here => Improved Racing Ed |
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My ‘70s Alfa twin cam has had an oil temp gauge for the last three decades, and yes, it is a provider of useful information. I have always been careful about warming up the engine sympathetically, and never extending it until the oil temp is into its safe range…and currently the old Italian b@st@rdo has 255000km on his odometer.
Conversely, my neighbor, who drives a Porsche Macan 2.9 litre twin turbo, “warms” it as he’s backing out his driveway, and then redlines as he takes off down the street. He’s short. So is the life of his engine. Cheers! Glen |
Unless you're racing, you really don't need to know your oil temps. Did any of your other cars come with an oil temp gauge? Does it worry you that they didn't?
If the oil temp in your Cobra gets to 200*F, do you do anything about it? Or do you just say, "Hey, look at that". :) I changed mine to a transmission temp gauge. Much more valuable info for me. |
I like oil temp gages and have them in most of my cars including my newer Shelby GT350. They are a more useful indicator for me of when I can stop babying the motor/car during warm up, than an oil pressure gage or an engine coolant gage.
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And for those of us with solid lifters, and aluminum heads on an iron block, your lash will start out less than your spec'd amount, then grow to be more than your spec'd amount, and then shrink back to the spec'd amount for hot lashing, all based on the thermal expansion rates of the different metals. It took me years to figure out that simple, obvious fact.:cool:
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If you stated it, I apologize... But by any chance do you have an oil thermostat? I installed a Canton thermostat on my Cobra before I even drove it for the first time. I homemade an aluminum bracket for it and mounted it to the forward cross-member and plumbed it in with the usual AN braided line. I think ERA has a "rough drawing" of the plumbing schematic in their "additional tech" portion of the website. And in regards to the oil viscosity, which I know I'm gonna start a holy war here but... it depends on the clearances of your rod and main bearings and environment your driving your car. I personally built my engine for my car and can tell you that I run straight 40W but that can be another thread.
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FWIW, just a few thoughts on weird oil temps:
1) The builder of my car actually had the water temp gauge sender screwed into the oil pan and the oil sender screwed into the hole for the water sensor. He actually drove it like this for ten years! Those gauges and senders are identical except one is labeled water and one is labeled oil. I thought I had a faulty water gauge because it was actually reading oil temp at the pan which is nothing close to the water temp at the top of the engine. It would also behave funny. The water temp would read about 180, but when you started driving above 3000 RPM for any reason, the water temp gauge temp would start rising very quickly and the only way to make the temp come down would be to drive easier to keep the RPM under 3000. When I asked the previous owner he said it had always done that and he had just gotten used to it. 2) I bought a new pan from Canton about 5 years ago, still not installed...LOL I had them weld in a new bung much lower so I could be sure the bulb was submerged in oil at all times. I did not like the stock canton higher location for the obvious reasons. To me it was barely in the oil at full, so if you were not at full oil level or driving aggressively you had a very good chance of reading the air temp in the oil pan. They liked my idea and told me they would consider a design change. I don't know if they ever did this going forward |
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That made me laugh. Thanks. I keep the revs below 3k at least until the water temp gets above 80C, and I usually confirm oil is at temp by making sure the oil pressure drops below 30 psi at idle before putting my foot into it. I'd like to have a functional oil temp gauge, just not sure I need one. Evan |
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I would say your thinking is pretty accurate. Also I think taking the reading at the pan is cooler than it would be at the head, but I could be wrong on this. I blocked mine off with see thru plexiglass because I like the way the oil cooler looks
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The question is, do you want to know the temperature of the oil in the pan after it has gone through the engine or after it has gone through the cooler and before it goes into the engine? I think a pan measurement is best. Oil takes much longer to rise than the coolant and a street engine with a 7 or 8 quart pan probably doesn't need a cooler. The engine likes the oil temp to be around 200+ degrees, if it's not getting there, running a cooler is a determent.
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that makes good sense. I vote for the pan
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Actually, I thought it might have elicited come comments about "the old Italian b@st@rdo" as most Cobra owners seem to think their car is a "she". Never been able to work that one out. I do think mine (Cobra) is good looking, and although he hasn't fired up in anger yet, he is definitely masculine. Maybe that's for another thread.... Cheers! Glen |
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