SUs have a fuel enrichment system. It works by lowering the fuel jet around
the needle, to allow more fuel to flow for a given air volume, rather than a
conventional air restrictor or "choke".
If your carbs are spitting back it is usually a sign the mixture is too
lean.
To set SU's mixture you need to use the small rod that allows you to lift
the damper. If the speed immediately increases when you lift the damper
your carb is too rich - screw up the jet. If the revs immediately drop, your
carb is too lean - screw down the jet. Do this on each carb separately
after disconnecting their linkages. Repeat on each carb until there is no
momentary alteration when the damper is lifted.
Then balance each carb by adjusting the idle screws until each carb makes
the same hiss (sucking sound) in the intake. Listen by using a small tube
placed near your ear and placing the other end sequentially down each carb
to check for the same hiss. When they all sound the same at the correct idle
speed, reconnect the linkages, making sure all carbs butterflys open at the
same time.
When SU's are balanced, mixture set properly and all open together, only
webers are better.
----- Original Message -----
From: wak dog <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, 16 May 2000 15:57 PM
Subject: Re: Cold Starts
> Hey guys,
> I am running su's on my 1600 and have no problem getting the car
> started but once you give a little throttle the su's backfire... i have
done
> the timing several times and had the carbs tuned... now i have the
fuel/air
> mix way to high... so i am chewing through petrol but it is real smooth...
> just wondering if you can hook up an choke/auto choke to su's...
>
> also
>
> i want to upgrade my engine... i am running an L20B, cam, su's, extractors
> into a 3 inch system and a 4spd with overdrive... should this engine
perform
> or not... coz it does alright but not like i think it should... what
> possible engines can i put in and what is the $$$ for a good engine
like???
>
> thanks in advance
>
> Scott
>
>
>
> >>From: Diarmuid Tyson <[EMAIL PROTECTED]>
> >>Reply-To: [EMAIL PROTECTED]
> >>To: [EMAIL PROTECTED]
> >>Subject: Cold Starts
> >>Date: Wed, 10 May 2000 10:32:20 +1000
> >>
> >>Hey all,
> >> wondering if anyone has any tips on getting your old L-series to start
on
> >>a cold morning. Mine is a stock L18 with original downdraft carb.
Engine
> >>reconditioned about 4 months ago and the carby I just got off Chris
Boland
> >>(1600 workshop) on the weekend. Best to use no choke and full throttle
> >>like its flooded? Or a little choke and blip the throttle to get it to
> >>turn over? Or lots of choke and no throttle? Problem is exacerbated by
> >>the fact that the battery is only good for about 7 or so 5 second cranks
> >>of
> >>the starter motor before she's had enough. TIA,
> >> D.
> >>
> >>
> >
> >________________________________________________________________________
> >Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
> >
>
> ________________________________________________________________________
> Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
>
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