I don't understand how you use the colortune, I understand that you can see
the flame color which indicates leanness/richness, but you can only see it
with no load on the engine. Doesn't load play a big factor on the mixture?
Rick Morrison wrote:
> The biggest reason the colortune type tools don't do a perfect job on B
> series engines (and A series for that matter), is the siamesed exhaust
> port for #2 and #3 cylinders along with the less than optimal water flow
> between the two center cylinders. This leads to nos 2 & 3 running a bit
> warmer than 1 and 4, consequently they are leaner mixture wise.
> If you use the color tune and keep this in mind, you will insert the
> "plug" in #2/#3 cylinders to set the mixture. This will result in nos 1 &
> 4 running a bit richer than optimal, but rich is definitely better than
> two cylinders running lean!
> The Uni-Syn is NOT a tool to set the mixture. It does nothing more than
> measure the airflow of the carbs, and will not indicate nor react to
> variations in mixture (until they become so far outside normal limits you
> can detect it with your ear!). If you try to use the Uni-Syn to set the
> mixture, you will be fiddling with the carbs til the cows come home.
> They, on the other hand, are great for equalizing the Idle on twin carb
> cars. With both carbs flowing equally, idle will be smooth and
> effortless.
> Use the Uni-syn for what it was made for. And mixture adjustment is not
> one of them.
> Rick Morrison
> 72 MGBGT
> 74 Midget
>
> On Fri, 24 Apr 1998 10:38:54 EDT AKBLACKLEY <AKBLACKLEY@aol.com> writes:
> >I havent used this tool myself, but I remember John Twist stating that
> >it
> >doesnt give a proper reading for use on MGBs (re: MOWOG 1500 to 1800)
> >engines
> >and advised against using it. This was at a club meet in 1992. Anyone
> >have
> >direct experience? In my experience a Uni Syn and some patience yields
> >pretty
> >good results. When tuning SU carbs it is critically important that
> >throttle
> >shafts are not leaking. Cheers, Andy Blackley
> >
--
John Steczkowski
Director, Business Systems Solutions, Central & West
PSW Technologies, Inc.
512-343-6666
stecz@pswtech.com
http://www.pswtech.com/~stecz
http://www.pswtech.com
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