The problem with that, Paul, is that you are relying (a) on your ability to
turn the idle adjustment screws EXACTLY the same amount, and (b) your
expectation that such turning will have the same mechanical effect on the
position of the throttle butterfly. Especially when the throttle shafts are
worn, the accomplishment of equal adjustments just by eye-balling the
position of the adjustment screws is very difficult.
And my original point was that this lack of accuracy need not be tolerated
because the Uni-Syn is, by its very design, just the tool to make such
guesswork unnecessary! If you adjust the throttle screws so that the
position of the "ball" in the tube is the same on each carburetor, you know
for a fact that the air flow through each venturi is the same, n'est-ce pas?
Lawrie
-----Original Message-----
From: Paul Hunt <paul.hunt1@virgin.net>
To: Lawrie Alexander <Lawrie@britcars.com>; CIAG6@aol.com <CIAG6@aol.com>
Cc: mgs@autox.team.net <mgs@autox.team.net>
Date: Sunday, January 17, 1999 9:11 AM
Subject: Re: Use of Uni-Syn (was carb. kit)
>Hmmm. Once I have equal airflow (at idle and off idle) and equal and
>correct mixture I set the idle by turning *both* screws by the same amount.
>Thereafter any adjustments to either mixture or idle are always done the
>same - both by equal amounts - but I find that once they really are set up
>correctly they can stay in tune for a couple of years, with the exception
of
>an occasional increase in idle speed as plugs and points deteriorate.
>
>PaulH.
>-----Original Message-----
>From: Lawrie Alexander <Lawrie@britcars.com>
>To: CIAG6@aol.com <CIAG6@aol.com>
>Cc: mgs@autox.team.net <mgs@autox.team.net>
>Date: 16 January 1999 22:10
>Subject: Re: Use of Uni-Syn (was carb. kit)
>
>
>>Well, that's one way to do it!
>>
>>Perhaps a better way is to set the idle speed roughly where you want it
>>(ideally about 900 r.p.m.), place the Uni-Syn on one carburetor and adjust
>>the air valve in the center of the Uni-Syn to position the "ball" halfway
>up
>>the tube. Then place the Uni-Syn on the other carburetor and note the
>>position of the "ball" in the tube. Then you adjust that carburetor screw
>to
>>position the ball halfway up the tube.
>>
>>If the ensuing idle is too fast, back off the adjustment screw and watch
>the
>>ball fall to quarterway up the tube, then move to the other carburetor and
>>do the same thing.
>>
>>Remember that screwing the air valve in and out on the Uni-Syn is just to
>>enable you to center the ball in the tube for a relative airflow. Once set
>>for one carb, you must not touch the air valve setting while you adjust
the
>>other carb idle screw.
>>
>>Lawrie
>>
>
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