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Exhaust manifold temperatures - misfiring #641641
01/06/20 06:15 PM
01/06/20 06:15 PM
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thelastgizmo Offline OP
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On another thread recently a member alluded to measuring the exhaust manifold temperature close to the block to check for misfires. This was in response to my suspicion of such in my '74 4/4 crossflow. I measured my manifold temperatures today after a short run (yes I can get out now...first time in 10 weeks). Temperatures of 2, 3 and 4 cylinders about 280 to 320 *C but around 130 *C for cylinder 1. Has anyone done this exercise on a 1600 crossflow and what figures did they get. Measured an inch or two from the manifold flange.

Re: Exhaust manifold temperatures - misfiring [Re: thelastgizmo] #641734
02/06/20 10:29 AM
02/06/20 10:29 AM
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That is quite a big difference, even allowing for possible extra airflow past No.1
Repeat the test a couple of times to check. Keep the same procedure each time. Test No 1 first. That way you will get a series of results to identify repeatabilty.


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Re: Exhaust manifold temperatures - misfiring [Re: thelastgizmo] #641751
02/06/20 11:43 AM
02/06/20 11:43 AM
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One thing that my affect the readings. The manifold pipe from number 1 is more shiney than the other three which are more towards the "black body" colour of a perfect radiator which radiate heat more efficiently. I've been out for a 10 mile run this morning and the car didn't seem to be lacking in power. Maybe just needs a good run out to blow out the cobwebs. I'll measure the temps again after the next run out. The checks I did with a Colortune seem to indicate that the cylinder is firing. Possibly intermittant but it sounds regular! But a big difference in temperature none the less. Possibly due to the paranoia of having a new (to me) car! Found a guy a hundred yards up the road from me has a Westfield with a crossflow. Perhaps pick his brains when this virus thing gets resolved!

Re: Exhaust manifold temperatures - misfiring [Re: thelastgizmo] #641771
02/06/20 12:58 PM
02/06/20 12:58 PM
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No.1 pot always runs cooler due to airflow and a great big fan in front of the engine.

Can't imagine taking the temperature of the exhaust manifold would aid the diagnosis of a misfire.

Should be pretty easy to diagnose a misfire without resorting to those lengths!

Arwyn

Re: Exhaust manifold temperatures - misfiring [Re: thelastgizmo] #641786
02/06/20 02:18 PM
02/06/20 02:18 PM
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Scientific papers have been written on the subject!! (yes really)


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