[T2] 74 Bus Carburetors

[Al Brase]

usually both bad floats and vacuum leaks make more trouble at low loads
than high load or high speed running. Whatever mixture inaccuracies they
are counteracted by a lot more flow. So, I would say not either floats nor
vacuum leaks.
I still say fuel delivery.
Funny you mentioned modern carbs. what the Kadron is is a Brazil Solex
COPY" of the 1952-1957 Porsche Super carb. 40 PBIC or some 40 PIBC, it
seems. These were pretty nice carbs and I do not know why Brosol made them.
I think you could be pretty happy with a set from Kaddy Shack. Those guys
are nearly ALONE in giving nationwide support for these.
I know you don't like the OE carbs and there is some reason to. They have
that central idling carb that is part of the left and supplies MOST of the
idle fuel/ air to both sides. But not all. So, you end up with 3 idle jets
total. I'd guess it was to keep it running when the vacuum retard was in
effect, that is, the timing running at 5 AFTER tdc.When all this stuff is
good and working right it works great. I had a 1973 automatic that had a
bad vacuum diaphragm when I got it. Back in 1981 or so. I tried everything
I could to work around it but finally bought the diaphragm for about1/4
what I paid for the whole bus. It worked GREAT after that. It had so much
off idle on could nearly pull the front wheels bouncing it!
Al

On Sun, Apr 22, 2018 at 12:17 PM, Bob Pratt <ka1dza at verizon.net> wrote:

> Could it be a vacuum leak under the carb? I had the same problem with a
> hole in the acceleration pump. If that is ok then the gasket under the carb
> may not be any good. I replaced mine with a cork one I made.
>
> Bob
>
> > On Apr 22, 2018, at 1:00 PM, John Sheldon <sheldon67 at verizon.net> wrote:
> >
> > Thanks for your responses about my stock carburetors for my 1800 cc bus
> (74).
> >
> > Gas pressure is good (5 psi).  Runs fine but lacks power after pressing
> accelerator).  Must be in the carburetors - floats likely.
> >
> > I might use this opportunity to just do away with PDSIT carbs and go
> with aftermarket.
> >
> > One suggestion was Kadron (at Kaddie shack).  I go to the site and there
> are a lot of choices - bells and whistles.
> >
> > I am just interested in a street-ride - no extra performance.
> >
> > Any other ideas or experiences for particular aftermarket carbs?
> >
> > Thanks,
> >
> > John
> > Columbia, MD
> >
> >
> > -----Original Message-----
> > From: type2 [mailto:type2-bounces at type2.com] On Behalf Of John Sheldon
> > Sent: Saturday, April 21, 2018 8:41 AM
> > To: type2 at type2.com
> > Subject: [T2] 74 Bus Carburetors
> >
> > I have stock 34 PDSIT dual carburetors - recently overhauled.
> >
> >
> >
> > Item 1
> >
> >
> >
> > Somehow on the left one, the tab on the electric choke has broken off at
> the
> > insulator block.  I have checked all of the usual parts places, and no
> one
> > seems to have one.  Anybody have a spare ?  Will pay of course.
> >
> >
> >
> > Item 2
> >
> >
> >
> > Secondly, I wanted to keep the original dual carbs to be a purist.
> However,
> > with the recent power issue I discussed here, I am weakening.
> >
> >
> >
> > What aftermarket carburetors would you install?  I know there are both
> > single and double carburetor systems.  I have seen them at over $400 and
> one
> > at over $1000.
> >
> >
> >
> > Ideas?
> >
> >
> >
> > Thanks, ,mates.
> >
> >
> >
> > John Sheldon
> >
> > Columbia, MD
> >
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