[DML] Re: Hot exhaust

["Nick" <nicholden@xxxxxxxxx>]

Hi,

I have performed a compression test and all those 3 cyclinders are 
at 160.

I have had the injectores tested again today on a test bed and 
obsered the spray patterns. All ok.

I have mechanically tested the timing with a timing light on 
indivudal cyclinders against the crank. All ok

The injestors are runnning multi point at the moment anyway and 
mixture on that bank was tested with an o2 sensor and was ok .

I have removed the new plugs that have done 10 mins of operation and 
they are all of a normal color and all the same color.

Havent really checked the blow by if any but i will do that tonight.

I am running an intercooler and only 6-8 pounds of boost at the 
moment with hight Oct fuel.

I have adjusted the valves and also removed the rocker cover and re 
checked and they are and where ok.

Thanks for all the suggections. I will keep you posted.

Cheers, Nick




    Posted by: "David Teitelbaum" jtrealty@xxxxxxxxxxxxx 
jtrealtywebspannet
    Date: Mon Nov 6, 2006 12:21 pm (PST)

Examine the spark plugs. If they are white (or at least much lighter
than the others) my guess would be that somehow those cylinders are
running leaner than the others. Maybe the "O" rings are not seated
properly or somehow your fuel system is undersupplying those
cylinders. Also do a compression test. Maybe the head gasket is
leaking. Are you getting much blow-by? I had an engine that sat for
years and the rings were not sealing good on a couple of cylinders.
They eventually did start to seal better after a while of driving. It
can also be that those cylinders are just running hotter than the
others so they are going to be the first ones to get to detonation.
Limit your boost to 6# unless you either intercool or change the
pistons. Use the highest octane gasoline you can get and maybe retard
the timing. On the Island Turbo set-up the mechanical advance is 
taken
out and the base timing is set back a few degrees. It probably
wouldn't hurt to check the valve adjustments either. You should run
synthetic motor oil and change it, the air, and the oil filters every
2,500 miles.
David Teitelbaum
vin 10757






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