Head temps, HOT, difference between 1 and 3 |
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Head temps, HOT, difference between 1 and 3 |
yarin |
Apr 15 2007, 07:46 AM
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#1
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'14-X'in FOOL Group: Members Posts: 988 Joined: 13-May 03 From: Guttenberg, NJ Member No.: 693 Region Association: North East States |
I've got two of the VDO spark plug type head temp sensors. One on cyl 1 and one on cyl 3. I know that cyl 3 is the hottest, but i'm seeing differences of ballpark 30-40 degrees between the two. From the drivers seat I can't accurately read the gauges, so i'm going to move the gauges somewhere else and see how hot the temps get.
On the track the #1 cyl gets to about 365F. The #3 gets hot, unconfortably hot for me. I thinking around 400. I tried retarding timing 5-6 degrees total, didn't seem to make a difference. A little history: the PO was doing a hill climb and literally melted the right side of the engine (cyl 3 side). He had the head rebuilt and slapped it back together. Before I converted to megasquirt the carbs had all this metal crap (aluminum maybe) welded to the inside of the butterfly valves. I'm thinking this head really had a melt down. #3 always run hotter than #1, even at idle. I'm going check reading on my stock injection head temp sensor and see what Megasquirt says. It was bugging the shit out of me at the track. I kept looking over instead of concentrating on the course. Thanks Attached image(s) |
Jake Raby |
Apr 16 2007, 06:22 AM
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#2
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Engine Surgeon Group: Members Posts: 9,398 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
The VDO is not the best instrument for total accuracy, but it does have repeatability....
The VDO gauges of yesterday were much better than todays, but none of them are temperature compensated.. I have 9 different head temp gauges to finish studies on over the summer, I plan on doing this while my Engineer intern is here from the UK as he is more analytical than even I am... The fellas at Georgia Tech and I have chatted about this and they have agreed to offer up some of thier gadgets for the test work when the time is right. These SPA design instruments have proven to be the best money can buy in the past, thats why I use them to drive the RDT Labs data logger, not cheap, about 300.00 each. (IMG:http://www.aircooledtechnology.com/customers/bolsen/invitem24067.JPG) |
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