Engine temps?, Measured by exhaust header temps?? Options

[Kerrys914]

Engine temps
I was checking some engine temps with an IR gun and found some weird temps

The 1-2-3 side runs 500F about 2" down from the heads

The other side gets weird..
6 = 350F
4-5 = 175F

What would cause the difference and the really low temps?


Engine is a 2.2 with webers

[Kerrys914]

I was reading on the bird board that it is very easy to install the cam 180deg out and still have the engine run okay??? The engine runs fine (at least as best I can tell). I don't have another 911 2.2 to compare to but it seems okay to me.


I don't think I did this but will check it this weekend. It's just funny how the two sides are so different in temps?

I will also have the wife rev the engine to about 2000rpm while I pull some plug wires. At idle there is very little if any change when I pull #4 and #5 wires off.

I guess I could put the IR temp gun away and then things would be back to normal LOL

Cheers and thanks

[slivel]

I was reading on the bird board that it is very easy to install the cam 180deg out and still have the engine run okay??? The engine runs fine (at least as best I can tell). I don't have another 911 2.2 to compare to but it seems okay to me.


I don't think I did this but will check it this weekend. It's just funny how the two sides are so different in temps?

I will also have the wife rev the engine to about 2000rpm while I pull some plug wires. At idle there is very little if any change when I pull #4 and #5 wires off.

I guess I could put the IR temp gun away and then things would be back to normal LOL

Cheers and thanks

I would look at the the problem in this order: First rev the engine to 2000 rpm as you suggested but instead of pulling plug wires, just measure the header temps on all cylinders and see if they are close to the same values. If they are, then I think it points to dirty idle circuit and you can clean them by blowing compressed air back through the circuit. Remove the idle bleed screw and shoot some air or carb clearer in the orifice. If the temp readings are still showing misfire at 2000 rpm then it may be that the float level is not set correctly for those misfiring cylinders. You can check the ignition side by clipping a timing light to each of the wires and look for the flashing timing light to be irregular on misfiring cylinders. If idle circuit, float level and ignition are all OK, then I would look at the throttle butterflies. One or more of them may be dirty where they seat in the bore. A good carb manual and a Unisyn air flow meter come in very handy when working on these carbs. Good luck.