Re: [alfa] carb synchroniser tool

["Paul Bayly" <thebaylys@xxxxxxxxxxx>]

Thanks Bruce.  I thought about making a U$3.10 4-tube manometer but unless
the source tank is sealed from atmosphere the tubes would need to be rather
long.  The sealed tank would also need an air space or the fluid would not
move.

I've heard that the front throat of the front Dell'Orto pulls less (or more)
vacuum than the other three ?  Something to do with the vacuum takeoff. Are
the twin Dell'Ortos, say off an early Euro Alfetta,  different PNs ?   If
this is so I'm not sure how one can synch the carbs without absolute values
of inches-of-mercury or inches-of-water etc.  Using the $1.55 balancing
technique would not work ( would it ?)

Beatle
'67 Duetto 1750-hybrid (DellOrtos)
Oz
----- Original Message ----- 
From: "Giller,Bruce C." <bgiller@domain.elided>
To: "Paul Bayly" <thebaylys@domain.elided>
Cc: "alfa digest" <alfa-digest@domain.elided>
Sent: Saturday, February 21, 2004 12:11 AM
Subject: Re: [alfa] carb synchroniser tool


> Beatle,
> Spend another $1.55 for another manometer????
>
> Motorcycles invariable have single throat carbs with one carb/cylinder.
>  With a 2-column sync'r, you designate one carb as the 'reference' carb
> (some bikes have one such carb which is non-adjustable).  Then you
> adjust the other 3 carbs to that reference carb, one at a time.  On my
> CB750 which has no reference carb, I adjust all four carbs at once since
> I bought the 4-column mercury unit so that they all pull about the same
> (within 1 cm of mercury) vacuum.
>
> My guess is that on double barreled carbs is that you do the same
> thing, pick a reference barrel and then adjust the other barrels to it.
> Is there a vacuum takeoff for each barrel where you can attach the vinyl
> tube ?  My SPICA GTV is easier since I use the idle air openings.
>
> There is another non-mecury sync'r call TwinMax which is electronic
(http://www.motohansa.com.au/docs/twinmax.pdf).
>
> If your Dell'orto's can be sync'd with a motorcycle sync'r, I'd go with
> a 4-column unit.  I'd think that you can transform the $1.55 2-column
> manometer into a 4-column by adding a common source of fluid.  Have 4
> lengths of vinyl tubing going into a pot'o fluid (ATF, oil, etc.), tape
> the tubing to the wall with the yard (mitre) stick and then do all four
> at once.
>
> Bruce
>
> Paul Bayly wrote:
> >
> > ----- Original Message -----
> > From: "Giller,Bruce C." <bgiller@domain.elided>
> > To: "alfa-digest" <alfa-digest@domain.elided>
> > Sent: Thursday, February 19, 2004 10:49 PM
> > Subject: Re: [alfa] carb synchroniser tool
> >
> > > Or for the cheap at heart try http://www.powerchutes.com/manometer.asp
> > > for the $1.55 version.
> > >
> > > Bruce
> > >
> > OK Bruce,
> >
> > you've piqued my interest.
> >
> > How do you synch 4 throats on two carbs using the $1.55 tool described
above
> > ?
> >
> > Do I use it to synch both throats on each carb first, then synch the
carbs
> > to each other ?
> >
> > Even though I've owned a number of single cylinder bikes and numerous
twin
> > cam Alfas I know very little about carbs, but I'm willing to learn.  I
have
> > a spare set of Dell'Ortos on which to practice and have a copy of the
> > SpeedPro book on powertuningWeber/Dell'Orto's.
> >
> > Beatle
> > '67 Duetto 1750-Hybrid
> > Oz
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