In my experience if you are a tooth off you couldn't get close to 12*
Are you sure the dizzy has been recurved to pre-smog specs? 68-70s were
timed at 0* not 16*. Moreover, if the idle is much above 700 rpms it will be
difficult to get an accurate timing. Did you disconnect the vacuum advance
hose?
Look at the plugs for how well the carbs are tuned after taking it for a
ride.
----- Original Message -----
From: <Ldino21@aol.com>
To: <datsun-roadsters@autox.team.net>
Cc: <Sextons4NV@aol.com>
Sent: Monday, December 15, 2003 8:46 PM
Subject: (no subject)
> I am posting this to the list to see if you guys have some different
advice
> of this Roadster owner, he is restoring a 1970-1600
>
>
> Sorry it took so long to get back to you. My problem seems to be at lower
> rpms, less than 2000. The engine spits, sputters and sounds like it's
missing on
> one cylinder. I've taken the carbs off, cleaned them well, tried my hand
at
> balancing / tuning but it still runs rough at lower rpms. I checked the
spark at
> each plug and it appears all plugs are firing. I checked the timing but
> couldn't turn the dizzy enough to reach 16BTDC. I could only get about
12BDTC. I've
> checked and set the points gap. The dizzy could be the problem, maybe it's
> off a tooth or two on the timimg. The shaft feels tight and doesn't seem
to be
> loose. I've never taken the dizzy driveshaft out of the car. I did
disassemble,
> clean and lube the top section but never took the whole dizzy out of the
> engine block. I haven't adjusted the valves clearances yet, but doubt they
could
> be causing the problem because it runs well at higher rpms. Because I
thought
> it was not getting fire on all cylinders, I let the engine warm up and put
a
> few drops of water along the exaust manifold. I noticed that the exhaust
> manifold was much hotter at the front of the engine (1-2) and got cooler
as I got to
> the back of the engine. The water would actually sizzle on the front part
of
> the manifold (as you would expect), but didn't on the back part. You might
be
> thinking either irratic or no spark on 3 / 4 or that there is something
wrong
> with the rear carb. My checks on these systems leads me to believe that
they
> are working. My next steps are as follows;
> - Remove the dizzy and try to improve on the timing (any suggestions
here?)
> - Adjust the valves
> - Replace the plugs and wires
> - Either put a bullet through it or find a good roadster mechanic in the
> Reno, NV area
>
> Any comments or suggestions would be greatly appreciated!
>
> Dave Sexton
> 775-626-2612 home
> 775-626-6900 work
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