Re: [AMC-List] 2x or 3x carb intake for 196ohv

["Swygert, Francis G MSgt 436 CES/CECM" <Francis.Swygert3@xxxxxxxxxxxx>]

The problem with multiple carbs on the 196 is the way the intake ports
are arranged, and the way the manifold is made. Being made onto the head
isn't the primary problem. Just think of it as a two piece manifold --
like the old cross ram 4V V-8 manifold really. The top of the manifold
(and "runners" in this case) come off. That made it easier to cast as
well as to adapt different types/sizes of carburetors, unlike Ford's
sixes. 

The intake ports are arranged as single ports on each end, and two
siamesed ports in the center. The exhaust is arranged as three siamesed
ports. The valve arrangement reflects this: I-E-E-I-I-E-E-I-I-E-E-I.  To
top it off, the ports are angled toward the center. On the ends this
isn't a problem, but for the center ports it means that the flow from a
carb placed beyond the "back" of the port ("back" being furthest from
center) must negotiate a 130-135 degree turn into the port. This isn't
to bad with twin carbs -- that's why I placed the carbs on the intake I
made with 1/3 of the bore past the "back" wall -- most of the flow could
enter that port without a big turn, and the end cylinders weren't
fighting the entire flow. The Offy intake puts the carbs right in front
of the siamesed port openings. The YF carbs I used (stock 61 L-head
carbs) were a bit bigger than the little Holley 1909 carbs (stock 61-63
for the OHV in the American, maybe earlier) the Offy was designed for. I
think the Classic carb will fit the Offy too, but it's a different model
Holley (the Classic produces 2 more hp, IIRC). 

I've considered EFI for the 196. A TBI would be easiest, but drilling
into the top plate or side of the block and mounting injectors wouldn't
be difficult. Just four injectors needed -- fire the center two over the
siamesed ports twice. Same would work for the L-head, except you'd HAVE
to go through the side of the block or use TBI -- there's a water
passage in the head above the intake "trough". 

---------------------
Date: Tuesday, December 26, 2006 10:04 AM
From: Jim Boone <fljab@xxxxxxxxxxx>

>Subject: Re: [AMC-List] 2x or 3x carb intake for 196ohv

>
>I ran a home made 2x1 intake for the 196 (there are no 3x1 intakes).
<snip>

A home made intake for these engines wouldn't be all that hard to make;
I
have a side-draft Weber that came off my brother's performance-reworked
MGB.
  That car is long gone, but I had thought of making a manifold out of
stainless or easier to work aluminum and setting it up.  Would be
unique!

A 3 x 1 bbl setup would be good to use as well, and would solve the
cylinder
fuel distribution problems inherint with a long six.  The original
Holley's
wouldn't be hard to come up with, and would be easy to work with IMO.



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