Join Date: 07-05-2011
Location: Gothtown Sweden
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Re: Strange exhaust burn pattern *PIC*
First up,you read exhaust ports and hedders as do you spark plugs.
Ie;right there and then. A goldfish has better memory,in other words it is NOT indicative of what has happend over the long run. IOW,to read any of them you need to have killed the ignition right there and then.
Cylinder 2 is the one that looks the MOST correct if we´re talking wide open throttle. When going WOT you should see along the lines of 910-940degC at that point (approx an inch or so off the exhaust port of the head). Ergo,that anything should be left sooty if even remotely within reason tuning wise is highly unlikely. Hot as hell? Yep. In fact at that point when everything is as it should just coasting along you should see around the 430-460degC mark or so (light load coasting,freeway or similar)
As the engine has seen lost exhaust hedder nuts,and totally so for cyl 2,it amounts to about nothing. In essence no conclusions can be drawn from that pic of yours. Fresh air WILL have entered at that point.
Word of advice. If you´re unsure that you´re ontop tuning wise invest in a wideband O2 setup. A simple regular 52mm gauge and a Bosch LSU4 will do it. That way you can always be ahead. Should run you like 200-240 dollars approx.
The LSU4 lambda needs a weldnut installed at the collector of the hedder pipe. Make sure that this weldnut isn´t installed so the lambda is at horisontal. That´s about it.
No need to ever take it out of there. About the only thing that might kill it is anti-freeze in the exhaust due to a shot headgasket or similar. Expect response time of O2 to be along the lines of 1/10 of a sec or so.
A step drill and a regular MIG welder is all you need to make it all happen. Yeah well,that and a few wires hooked to where they need to go.