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) |
BMXerror |
Apr 15 2007, 11:06 AM
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#2
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Senior Member Group: Members Posts: 1,705 Joined: 8-April 06 From: Hesperia Ca Member No.: 5,842 |
Well, is anyone going to ask it? I know this will probably start a flame war of opinions, but what is the nominal temperature range for T4 cylinder heads? Is there a factory spec for "don't get over..'' such and such. Is 400 degrees bad or not? I mean, VDO did make a 600 degree gauge for Porsche, which leads me to believe that they were expecting it to be most accurate between 300 and 400 degrees. 400 may be on the high side, but is it at the breaking point of the metal? Fire away. (IMG:style_emoticons/default/ar15.gif)
Mark D. |
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