Adam,
To do the idle you have to disconnect the "arms" and use the screws on the
carbs to balance the carbs. After the idle is set you reconnect the arms to
the carbs and adjust the arms to get your carbs balanced for high speed
running. The arms have to be long enough so that your idle isn't affected.
PITA to set up but you get the hang of it after several years :)
FWIW, I use the high speed screw to raise or lower my idle with no problems
if the linkages are set up correctly. My car hates to idle below 800 - 900
and I need to time it at 700.
Mike
----- Original Message -----
From: "Adam Bradley" <ambradley@yahoo.com>
To: <bholland@hayes.ds.adp.com>
Cc: "Datsun Roadster Mailing list" <datsun-roadsters@autox.team.net>
Sent: Wednesday, October 17, 2001 12:10 AM
Subject: RE: Throttle adjust screw
> Thanks for the reply.
>
> I have a 1600. Maybe I'm still missing something because although I
> can adjust the length of the arms, the throttle that they're connected
> to can't be adjusted, so if I shortened one (beyond what is necessary
> to have no effect on the idle setting), it would pull up slightly on
> that carb's throttle, negating the idle adjustment screw on the carb
> itself.
>
> What am I not getting???
>
> --- Brian Hollands <bholland@hayes.ds.adp.com> wrote:
> > On 1600 the two link arms to each carbs throttle shaft are adjustable
> > for
> > length. On the 2000's one of the throttle shaft levers (the front
> > carb's I
> > think) fits directly into the center linkage piece and is directly
> > actuated
> > by it. The other carbs throttle shaft lever fits into the other side
> > of the
> > center link loosely (slack above and below). The slack is taken out
> > by an
> > adjusting screw on the center link. At idle, the throttle shaft
> > lever arms
> > should be resting on the idle speed screws on each carb such that the
> > linkage is exerting no force on them. As the throttle pedal is
> > pressed down
> > the linkage will open one throttle directly but the other can be
> > adjusted by
> > the screw on the center link (or the length of the arm on the 1600)
> > such
> > that both throttle plates are open the same amount. Check it by
> > syncing
> > them at idle and then opening up your unisyn a bit and putting it
> > over each
> > carb throat at 2500-3000 rpm. They should draw the same amount of
> > air.
> > If you think it's a dumb set up, try a British car with those
> > convoluted
> > spring clams to connect the throttle shafts and center link. Yuck
> > Brian '69 2000
> > Tampa, FL
> > http://web.tampabay.rr.com/oilleak/
> >
> >
> >
> > -----Original Message-----
> >
> > This makes sense, but what can you adjust at 2,000 - 2,500 rpm that
> > doesn't impact idle
> >
>
>
> =====
> Adam
> '70 1600 SPL311-28181
> http://www.picturetrail.com/abend
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