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By ALL AMERICAN RACER - 13 Years Ago
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kinda getting far ahead here but
thinking of fabricating pair of log manifolds
what angle is the intake surface at?
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By Hollow Head - 13 Years Ago
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Who cares about angles, if you're really going to fab logs  .Separate logs at least don't mind about angles... 
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By ALL AMERICAN RACER - 13 Years Ago
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most American V-8's are 90 degrees
and square logs are a little easier
to mount carbs on top of
350 CFM 2 bbl on each log
should be good for mild performance engine
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By PF Arcand - 13 Years Ago
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First a mild performance engine can hardly use 6 carbs. Secondly, the intake is like a single plain race intake and are very hard to get to run properly on a street engine. Nearly all the old log intakes anyone ever sees are for sale..for good reason.
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By ALL AMERICAN RACER - 13 Years Ago
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figured out better way to do this
4 individual manifolds
one for each pair of intake ports
or 2 manifolds going across
each one going between
the pairs of ports
because if you come off intake ports face of head
square you keep getting closer to the
middle of engine the longer the runners are
pretty soon you run out of room
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By John Mummert - 13 Years Ago
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The manifold faces on the heads are 120 degrees. 90 for the block and each head is angled 15 degrees.
I've seen flanges for sale on ebay.
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By ALL AMERICAN RACER - 13 Years Ago
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good stuff mr mummert
it can be built as a 'combo'
run four manifolds for engine than can run 4 2 bbl's
or bolt on 'bridges' with one 2 bbl each in center
for engines can only use that much carb
note: the 'bridge' is like this attachment
get rid of middle carb, change 4 bbl to 2 bbl
and turn it upside down
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By pegleg - 13 Years Ago
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Carson, Aside from the "WOW" factor, you'll probably be a lot happier with one of John's intakes and a decent single four barrell carb.
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By PF Arcand - 13 Years Ago
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I agree with Frank's remarks. Mummert's intake tested on a comp engine, bested a Tunnel Ram intake.
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By ALL AMERICAN RACER - 13 Years Ago
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more on building 4 intake manifolds
to fit on each pair of intake ports
1 manifold runners ought to be
'mail chute' shaped
straight down and curve to pair intake ports
2 carbs should all be forward facing
sideways is out because they weren't built
to slosh sideways
3 milled face around intake ports on our heads ( BT1E )
include outboard boltholes for stock manifold but not inboard ones
inboard bolt holes are way over by heat riser passage
that makes things a little tricky
4 not dealing with cooling crossover now
which shares one bolt hole w/intake
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By grovedawg - 13 Years Ago
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I'm watching. If you're stoked on it, and are going to do it do it! I'd love to watch this progress.
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By ALL AMERICAN RACER - 13 Years Ago
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here's topview of engine with CHUTES only
i'm going to build a 'mule' prototype that
will have a box that fits carb base
on top of chute and then gaps need to be covered up
the chutes look like they need to be about 3" square
and the carb pads will be wider than that
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By ALL AMERICAN RACER - 12 Years Ago
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forever's
have rethought this thing and here's the new version.
it's a 'rain gutter' design.
rectangular boxes with a bolt on lid.
this is offered in 'Don Prudhome' tradition.
helping other racers.
if anybody's interested in building these,
i'll continue, if not that's fine.
later
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By Hollow Head - 12 Years Ago
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Any pics? Interested...
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By ALL AMERICAN RACER - 12 Years Ago
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hollow head
i can't build these any time in the near future.
bear with me here.
if this was made for a straight 6.
you make 1/4" thick plates just around
the ports and bolt holes.
then you make a box from sheet metal or aluminum.
use a 2 barrel ready made spacer to put on top.
top needs to be screw on so the intake bolts
can be tightened first, then put the top on.
that's for a 6, for the y block you just use
two of them, one for each head.
put a 2bbl sideways on each manifold and that's it.
water crossover you make separate.
thanks
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By yblock32deuce - 12 Years Ago
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just my 2cents worth on 6 carbs on a y/block, pf is correct to a point. 6 2s are reliable enough to run regularly on the street if properly or closely tuned. i say this because i have been running this setup on my 32 3window 5speed coupe for over 3 years and at times it will sit in the garage for 2 to 3 months at a time without me even firing it up.(not my daily driver for sure) and although you guys are right,it is not even close to the performance characteristics of a good mummert manifold and carb , or even the 3 deuce setup that i have sitting on a shelf, the wow factor of this setup perched on an old yblock with merc. valve covers, mallory dist.hiding a petronix unit is really worth it all. as is said ,just my 2cents worth.
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By aussiebill - 12 Years Ago
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Sounds like 2 cents well spent, 
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By bird55 - 12 Years Ago
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I still like this one best.
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By PF Arcand - 12 Years Ago
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Some people are bears for punishment.. I have some experience so to speak with a 6 carb intake. A buddy ran a 56 ford in "D" gas in Washington state in the early-mid 60s. The intake was a custom built cross ram, not just a log setup. It had 3" dia. tube upper runners & boxed down tubes with properly divided porting. Down tubes were about 8" long Carbs were 94s. At mid track it had great torque, in one case that I recall, almost staying with a pro built car with a fuel injected 327. But...the achilles heal of the setup was that despite much tuning, it was not tractable at the low end. Bogging out of the hole was a big problem. Only using excessive RPM on the line would overcome it, which led to excessive wheel spin, and many losses. Unfortunately he was never able to tune the problems away..
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By glrbird - 12 Years Ago
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Alan I'm with you, that manifold says please take the hood off!!!!!!!!!!!!!!!!
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By ALL AMERICAN RACER - 12 Years Ago
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y blockers
what pf arcand says about an open plenum manifold
is just about the size of it.
another way to say it is 4 speed car and 1800lb tube frame.
anyhow, latest development is to call it a 'crackerbox' manifold.
building this kind of manifold for a 4, 6 or V8 is
just a little Popular Mechanics type project.
later on
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