Dave,
The Monojet Rochester was available on GM 194/230/250/292 inlines from
1968 to 1972. It was relatively short-lived because of the fuel crisis and
emissions concerns. It uses a metering rod like AFBs from Carter. It has the
same base pattern as the Model B, you can recognize it because it is a
square-looking carb and it says "Monojet" on the side of the float chamber.
A friend has a pair of these on a 250 and likes them a lot. I've noticed
they don't leak like the model B's are prone to, and the position of the
metering rod can be altered by bending the attaching tab - the instructions
in the rebuild kit show how to do this. I don't now about availability of
different jets or metering rods though.
Jack / Winter Park FL
----- Original Message -----
From: David G Shier <dshier@rmi.net>
To: jack halton <safesix@worldnet.att.net>
Cc: Antonio R. Tijerino <antonio@innercite.com>; Ole Trucks
<oletrucks@autox.team.net>
Sent: Friday, October 08, 1999 10:18 PM
Subject: Re: [oletrucks] Carb question.
> Jack, I am working on an installation of 2x1 barrels on a Fenton dual
intake and
> do not care about milage but want it to work well for around a small town
and
> short trips. (nostalgia situation) We have lots of older GM carbs and can
> probably match something up but would appreciate your input on what would
be
> practical. This particular truck is just for fun so we just want it to
start
> and run OK!
>
> Secondly our 49 one ton (235) might benefit from one of these newer
Rochester
> Monojet's you mention here and we wonder what age GM's these would have
been on
> and what engines so we can look for in the salvage yards.
>
> We also have a new Weber 2 barrel I took off of a high performance Jeep 4
> cyilinder we built for our high altitude here and are going to use it for
a very
> special six we are building for one of our trucks. I can tell everyone
that
> this carburator transformed this Jeep engine (we also used a Clifford Cam
and
> built our own exhaust) into a real performer up to 9,000 feet or so. We
> enthusiastically recommend these carburators and they can be found as
Holly's on
> Ford & Mercury 4 cylinder engine versions in the salvage yards. We do not
know
> the numbers on these but they look like Webers and we put them on Jeeps
with the
> adaptor which necks them down to the one barrel manifold entry.
>
> Thanks in advance for your usual helpfull advice and guidance. As you can
> probably tell we love inlines!
>
> Sincerely,
> Dave Shier
> www.mtntown.com
>
> jack halton wrote:
>
> > I do't know much about the Carter carbs but there were many different
> > Rochester model B single barrel carbs offered on GM inlines. They vary
in
> > CFM from about 200 to 250. CFM ratings for inline engines are measured
> > differently than for V8s so these numbers don't compare to 4-barrel
specs.
> > Some (model BB) had electric chokes and these were in use at least
through
> > the early 60's.
> >
> > They are not a bad carburetor, very simple in operation and easy to work
on.
> > But they have a bad reputation as "leakers" because the float chamber
can
> > get distorted from overzealous tightening of the top cover screws.
Throttle
> > shafts can get badly worn too. Last I heard, Rochester "B" carbs were in
the
> > $90 range, rebuilt. Gas mileage was not a big concern in the era these
> > carburetors were used, though. If you consider that the newest of these
> > carbs is now approaching 40 years of age, It may be preferable to look
for a
> > more modern replacement. The Rochester "Monojet" is a more modern design
and
> > was used on the later family of GM inlines, it's pretty much a bolt-on
> > replacement.
> > Also worth considering is the Holley-Weber staged 2-barrel. Requires an
> > adapter to the stock manifold and some linkage modification, but gas
mileage
> > and driveability are improved.
> >
> > Jack / Winter Park FL
> > ----- Original Message -----
> > From: Antonio R. Tijerino <antonio@innercite.com>
> > To: Ole Trucks <oletrucks@autox.team.net>
> > Sent: Friday, October 08, 1999 1:49 AM
> > Subject: [oletrucks] Carb question.
> >
> > > I hope this is not a FAQ, but for the AD trucks with the 235 engine,
> > > which carb is better? The rochester or the Carter? What are the
> > > differences and the CFM specs of each? Which one would go better with
a
> > > dual exhaust setup, but with single carb? Also within each of these
two
> > > carbs, are there different models of each?
> > >
> > > Thanks,
> > >
> > > Antonio,
> > > '53 3100
> > >
> > > oletrucks is devoted to Chevy and GM trucks built between 1941 and
1959
> > >
> >
> > oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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