It's a good point. I usually end up by re-checking the balance at the final
idle speed and off idle.
PaulH.
-----Original Message-----
From: Lawrie Alexander <Lawrie@britcars.com>
To: Paul Hunt <paul.hunt1@virgin.net>
Cc: CIAG6@aol.com <CIAG6@aol.com>; mgs@autox.team.net <mgs@autox.team.net>
Date: 17 January 1999 22:06
Subject: Re: Use of Uni-Syn (was carb. kit)
>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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