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) |
Joe Ricard |
Apr 16 2007, 06:51 AM
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#2
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CUMONIWANNARACEU Group: Members Posts: 6,811 Joined: 5-January 03 From: Gautier, MS Member No.: 92 |
Yarin, you can always back up your VDO gauges with your contact tire pyrometer.
I stuck the probe down the sparkplug hole in the tin getting the point as close to the pug base as I could. Comes out pretty darn close to what the gauge reads. I also got the Westach dual gauge. I run one thermocouple on each side. 1-3 Usually 20-30 degree difference side to side. |
yarin |
Apr 16 2007, 10:40 AM
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#3
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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 |
Yarin, you can always back up your VDO gauges with your contact tire pyrometer. I stuck the probe down the sparkplug hole in the tin getting the point as close to the pug base as I could. Comes out pretty darn close to what the gauge reads. I also got the Westach dual gauge. I run one thermocouple on each side. 1-3 Usually 20-30 degree difference side to side. Joe - I don't have a pyrometer.. yet (IMG:style_emoticons/default/smile.gif) Do you leave the pyrometer there when on the track or autoX? I'm a numbers guy myself, I like seeing reading as an indicator of whats ok and not OK. I think i'll order the Dakota gauge. |
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