Re: [FWDLK] 56 Fury linkage vs 57 Fury Linkage

[Mike Apfelbeck <moparmike72@xxxxxxxxxxx>]

If the '56 type intake manifold has a divided plenum under the carbs, 
and you're driving along with just the rear primaries open, the front 
intake plenum will be under a high manifold vacuum condition because 
the front four cylinders are functioning as a vacuum pump driven by 
the rear cylinders. The gas mileage will be worse because the 
throttle needs to be open farther to drag the front half of the 
engine along. There will also be plenty of vacuum to suck oil past 
the rings and also suck gasoline through the idle circuits in the 
front carb, to mix with it.
The V/8-6-4 engines work because they have provisions for 
de-activating the valve lifters in those cylinders to elimination 
energy draining pumping loses (vacuum).
The second generation hemi (426) has a four-stage throttle linkage 
installed, it's fairly complicated, with links installed on both 
sides of the carbs. Next time you see a 60s Hemi musclecar at a car 
show, take a squint at the top of the engine and you'll see what I mean.
I

Mike


At 11:13 AM 11/24/2009, Eastern Sierra Adjustment Svc wrote:
> Is this such a bad thing, for the engine, to have gas be delivered, 
> initially, only to the rear
> cylinders?  The front cylinders are still getting the oil supplied to them.
>
> The new Hardly Dangerous  motor cycles have a provision where, at 
> prolonged stoppages,
> the rear cylinder has its fuel supply interrupted, in order to avoid 
> any overheating of the engine.
>
> And, we all know about the current V/8-6-4 provisions on modern cars.
>
> So, outside of a racing venue (yeah, like any of us do that, 
> anymore), what difference/effect would
> there be, using the 56 aluminum intake,  with a progressive linkage 
> employed, with 57+ m.y. carbs,
> wherein the front carb begins to supply gas when the rear carb's 
> primaries open to about 30%?
>
> BTW, I've got an old (what other kinds are there?) issue of Hot Rod, 
> where it shows you how to
> adjust your 57+ linages so that all 8 barrels operate in the manner 
> of the 55-56 versions.
>
>
> Neil Vedder
>
>
>
> Archangel1390@xxxxxxx wrote:
> > *Nick,*
> > ** *       If the dual quad manifold  is the 1956  Fury aluminum 
> > manifold without the automatic chock heat tube, _then you must run 
> > straight linkage to make the engine gets gas to the front and back 
> > cylinders._ If the manifold is 1957 or 1958 dual quad manifold made 
> > of cast iron and has the chock heat tube then you can run 
> > progressive linkage or straight linkage.*
> > *       The front part of the 56 Fury aluminum manifold and the 
> > back part of the manifold has a wall inside it that separates the 
> > rear carburetor from feeding the front 4 cylinders.*
> > *        The most important thing you can do is make sure you are 
> > _getting full throttle_ when the pedal is to the metal. DO NOT 
> > UNDERESTIMATE THE RETURN SPRINGS. THEY MUST BE RIGHT ALSO FOR FULL THROTTLE.*
> > ** *                       Ron Swartley*
> >
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