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EFV-8 Club Forum / General Ford Discussion / multi-carbs

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Discussion Topic: multi-carbs

cresty

09-09-2010 @ 5:01 PM

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Member
Posts: 32
Joined: Oct 2009

I'm considering installing one or two extra carbs,-----amongs other things,---on my '51 Ford 8BA.If I go with Tri-Power will I have to go with another Cam to make it Worth-While???
Thanks All,
"CRESTY"

37RAGTOPMAN

09-10-2010 @ 4:52 AM

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Posts: 1958
Joined: Oct 2009

Before you start buying a lot of speed parts do your reserch on this, BY getting FLATHEAD SPEED EQUIPMENT catalogs, and a BOOK or MANUAL on hopping the FLATTIE UP,
are you doing if for looks,? or want more power,
if for power, pull your engine out, install a 4 inch MERCURY CRANK, so now you went from 239 cubes to 255, with a stock bore,
and this is just the tip of the iceberg,
call FLATHEAD JACK, he has engines already done,
just tell him what you are thinking,
All I am telling you is to DO YOUR RESERCH before DIVING IN, its not cheap,,,,,!!!!
and you will have problems. not unless you are a good mechanic
hope this helps, 37RAGTOPMAN and KEEP on FORDIN,,,!!
if you are located in NE.,there is a man in MAINE, that knows what he is doing,does it all the time,
you tell him waht you want, and that's what you get,

Stroker

09-10-2010 @ 9:01 AM

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Posts: 1460
Joined: Oct 2009

Ragtop's advice is excellent. One tome that I cut my teeth on in the 50's was Roger Huntington's "How to Hop-Up Ford and Mercury V8's" You can find reprints of this excellent, easy to read little book on E-Bay, or Amazon.

Going to a 4 inch crank is also a great albeit expensive modification unless you are rebuilding the engine. As for cams, the stock 8BA is pretty good, and any increase in duration WILL effect low speed performance.

The biggest problem you will encounter is with your ignition. The stock 49-53 distributor is designed to regulate advance based upon carburetor venturi vacuum. Any change in carburation
will screw up your advance curve.

My older brother had a 51 that was purchased new. He installed an Edelbrock single 4-bbl manifold with a Stromberg 4-bbl carb sourced from a 53 Buick with excellent results, but had
to run a Mallory ignition with centrifugal advance in order to overcome the advance problem.

So...as you can see, one thing leads to another, especially on an 8BA. I built a 281-inch
(4" stroke, 5/16 + .030" bore) ported and relieved 59A flathead with an Edelbrock 3-carb, and Weber F1 (mild grind) cam. It performed very well for many years in my heavy station wagon, but only after I replaced the 3-97's with Stromberg V8-60 carbs. In short, 3-97's were simply too much carb for even a 281 inch motor in a heavy street-driven car. Originally, I built this motor for a 32 pickup, and it was a feisty little terror in that application with a 4.11 rear end. Once I transplanted it into the wagon with a 3.78 gear set; its shortcomings became apparent.

It is so easy to get carried away with the "supply-side" of the equation. You need a balance
between the volumetric needs of the engine, (required air flow), and your total carburetor venturi area. Too much venturi area will make drive-ability suffer due to poor throttle response, stumbling, etc.

I would think that if you simply want more available on-demand power, a 4-bbl manifold/carb
combination will give you the most bang for the buck. Just don't overdo it when you select
your carb, and keep the CFM rating low. You will also have to deal with the stock ignition
issue. In conjunction with this, I think a good set of headers and dual exhausts would free up some ponies.

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