I put 2 grooves into the squish area of a 1600 DP head (squish zone
across from the plug). The grooves are aimed at the spark plug.
The motor runs sweet. I have run it and it started with the
distribuiter missaligned by ~1" of travel.
I now have the
motor tuned in and it runs smooth. I think it also runs cooler
but the brakes on my car need repair before putting it on the road
other than short run testing. I had set the idle at 500-550 rpm
but the alternator output was weak and the oil pump light would
flicker. I have the idle set at 750 rpm with no oil light and a
stronger alternator output.
In both cases the timing likes to be set at about 7deg after top
dead center
(5deg after top dead center is correct for my vac
advance/retard distributer).
I plan to play with the settings some more and test for mileage vs the
stock mileage (28-32 mpg).
I have video of the motor
running but I have to upload it. Arthur(dot)will(at)pgnmail.com
Click the link below for more...
Update...
It feels smoother at idle. I cannot tell if the response is quicker but
it is responsive. I am still trying different settings. So
far it feels strong and has not smoked or backfired even when the
timing was set 10-15deg ATC. It also likes to run lean as the idle
picks up and the response is crisper.
The setting where I expected to
set the volume control screw at, appears to be too rich (the idle goes
down and the engine feels bogged down). Normal fuel ratio is set at 2.5
turns on the volume control screw (small) and then adjust out and in
untill the idle falls off on each side. then just back from there
towards the spot where it runs/responds the best. 1-2.5 out on the
Bypass to set the idle. My volume control screw is set
about 1-1.5 turns and the Bypass is set at about 1 turn. I currently
have the idle set at 750 rpm with idle timing set at 7 deg before top
dead center. The motor feels strong.
I have ported and polished
the heads and the intake runners. Compression ratio is set at
6.9. I have to pull the plugs as I have them at the stock
settings. I am running a blaster 2 coil and high energy wires so
I can open the plug gap which I intend to do. When I pull the plugs
I will read them for a peek at the combustion chamber.
I tried
the going from 1st to 4th test but the engine, as it is tuned, did not
like it.
Allthough it did keep running!
It just bogged down a lot!
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