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Re: 1500cc engine not working right

To: "de Brebisson, Cyrille (Calculator Division)" <cyrille@hp.com>
Subject: Re: 1500cc engine not working right
From: Lester Ewing <lewing@sport.rr.com>
Date: Sat, 1 Apr 2006 22:06:04 -0600
Don't be offended.. but this sounds like firing order problem..  at  
lest when I had this problem it ws firing order.. ;-)

Lester


On Apr 1, 2006, at 5:02 PM, de Brebisson, Cyrille (Calculator  
Division) wrote:

> HELP!!!
>
> Well, after the engine rebuild, the engine started but is not working
> right.
>
> It only works with 40 to 80 degree advance!
>
> Here is all I tried and checked so far:
>
> - cam timing appear to be ok
>       Checked at TDC, valve 1 and 2 fully closed, valves 7 and 8 at
> exactly the same position (overlap), uneven valves 7 and 8 becomes
> visible at +/- 4 degree, and 1 tooth mis-alignement is 12 degree....
>       Compression is 150 psi on all 4
>
> - poulie mark indicate real TDC
>       Checked by looking at pistons moving up and down as poulie mark
> approach TDC
>
> - no vacuum leaks
>       Checked by spraying carb cleaner around intake manifold and carb
>
> - distributor mechanical advance ok
>       Checked by watching advance change with vacuum disconnected as
> RPM changed
>
> - vacuum retard ok
>       Checked by sucking on the hose :)
>
> - timing light ok (yes, I even checked that using a second car)
>
> - the timing light is then used to check the timing with engine set at
> fixed 1500 rpm
>
> - at rest, TDC, the rotor is pointing roughly at #1 spark
>
> After I start and warm up the car up, I can adjust the distributor
> between 35 and 80 degree advance (best running at around 60), if I  
> pass
> these 2 marks, the engine stops.
>
> The car rapidly heats up, which is consistent with too much advance
>
> It is running a little bit rich at the moment, but I am not worried
> about that too much for now...
>
> The car setup is: 1500cc, 9:1 compression, Street B cam, weber DGV
> carburetor, pace setter exhaust manifold, 14mil valve clearance (warm)
> as per cam spec.
>
> HELP ME!!!!! I am at lost, what else could be wrong?
>
> Thanks, cyrille




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