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1967 frankenporsch
 
Join Date: Jul 2002
Location: puerto rico
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Exhaust manifold cherry Red at idle

A friend of mine 930 exhaust manifold glows Cherry Red at idle after just 5 minutes of operation. Aftermarket b&b stainless exhaust. Also muffler shows a really high temperature but not cherry red.
Timing verified, different cams checked, different mufflers, different static timing, new injectors. No misfire at all at any moment.
Different gasoline brands.
3.3 liter engine.
W3dpo Bosch spark plugs
CIS injection.
Is that normal??
Maybe he is looking for a problem where it is not.
Advice, comments more than welcome
Thanks.
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1967 normale
Old 01-12-2018, 04:12 PM
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Extremely lean mixture can cause this or way out of time.
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Old 01-12-2018, 04:22 PM
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Plugged cat?
Old 01-12-2018, 04:25 PM
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1967 frankenporsch
 
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Both were supposedly inspected
Thanks
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1967 normale
Old 01-12-2018, 04:26 PM
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1967 frankenporsch
 
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Not cat,
Aftermarket exhaust
Thanks.
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1967 normale
Old 01-12-2018, 04:28 PM
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Timing too retarded?
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Old 01-12-2018, 04:41 PM
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Quote:
Originally Posted by 16Volt View Post
Extremely lean mixture can cause this or way out of time.
Quote:
Originally Posted by lrodri64 View Post
Both were supposedly inspected
Thanks
If your friend values his engine ... inspect again.

_
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Old 01-12-2018, 05:08 PM
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1967 frankenporsch
 
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Ok,
Im going to confirm that tomorrow
Thanks.
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1967 normale
Old 01-12-2018, 05:11 PM
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Check the temperature of each cylinder header primary tube. One lean cylinder can cause these symptoms while the average AFR reading remains in spec. If once cylinder is an outlier verify fuel flow at the injector for all 6 cylinders. This is assuming that ignition and cam timing has been verified and there is no occlusion in the exhaust system.
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Old 01-12-2018, 06:14 PM
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How did he check the timing? I would guess its still too retarded and remember that stock timing is way too retarded for good engine operation but was chosen for emissions. I can run my engine close to stoich and it does not get cherry red ( good amount of timing advance) and leaner than stoich starts to get cooler beleive it or not. Stoich burns about the hottest and makes least emissions.
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Old 01-13-2018, 08:01 AM
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29 beforehand in 4000 tr / mn, temperature of oil in 90 , for one 930 European. Too much beforehand made also too much warm the exhaust. ;-)
Old 01-13-2018, 09:19 AM
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No spark can cause this. Fuel ignited when it hits cat or exhaust
Old 01-13-2018, 09:58 AM
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Turbofrog
 
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No misfire though
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Old 01-13-2018, 10:30 AM
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1967 frankenporsch
 
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Shop was closed today.
He has to wait till Monday.
Thanks for all the tips.
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1967 normale
Old 01-13-2018, 12:44 PM
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1967 frankenporsch
 
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1967 normale
Old 01-16-2018, 01:16 PM
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^^^ WOW! That is an issue.

I bet the heater works awesome.
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Last edited by 1979-930; 01-16-2018 at 02:06 PM..
Old 01-16-2018, 01:32 PM
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banana in the tailpipe?

seriously, something definitely wrong. Is there some obstruction on there?
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Old 01-16-2018, 01:56 PM
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he may be using the wrong timing mark....too retarded.

if he is using the TDC mark for the advance mark that will retard the timing.
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Old 01-17-2018, 02:46 AM
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