Duel down draft

M

modeladan

Member
I have a Zepher manifold with two Ford 94 carbs, are the 94 carbs suitable or should I use another carb. The 94's need rebuilding so at this point I what to find the best carb.
 
I'm going to say the 94's are too much. You might ck over on the EV8 board, couple of good carb guys there can make a recomendation or someone here will chime in. I'm thinking 81's.
Paul in CT
 
Two 94's on a stock engine is too much. You'll need 7:1 compression and a big cam to make good use of dual carbs. Good idea to use a distributor with auto-advance too.

I'm running two 97's with a 7.6:1 head and a Brierley R1 Winfield grind cam with .040" over pistons. Also running a FS electronic distributor with centrifugal advance.

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Well, my experience is that dual 94s are great because of the flexability of tuning I have with those. As you can see in the pixs below, this is just one of several bangers I have using this combination. We cruised the fairgrounds at the Nationals with no problems whatsoever and the engine has a strong mid-range acceleration too. I have also raced Model A/B engines on dirt where we went from a standing start, and in dirt racing you steer the car with throttle control. Having stumbles or dead-spots will make the car hard to handle and therefore is unacceptable for me. Again, another reason for me using 94s.

I think the key in any multiple carburetor set-up is knowing how to tune them and having properly rebuilt carbs to start with (ones that don't leak air internally). What I think is key to why these work better than a 97 or 81 is having power valves to tailor how I want the fuel delivery. Also having more control with the accelerator pump rate delivery and squirter sizes. And, many of us find the 94 is superior to a 97 when it comes to not leaking/weaping fuel!!

My suggestion is have Rudy Faltermeier (Google him) build you a matched set with adjustable jets and a progressive linkage set-up. Tell him the cam, compression, and gear ratio (RPM) you have and he will put you right on the set-up no matter whether it is totally stock or 'built' to the max.










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I'm running a pair of the new English 97's on a Zephyr manifold with a Brumfield 7.1 head, headers, Crower cam and an FS ignition. Also have a counterweighted crank, lightened flywheel and all parts are balanced. It took me 11 years to get the right combination of power and reliability!
 
dual 94's should work fine with a little tuning, most likely smaller power valves and/or ones that open with lower than stock vacuum. I prefer Strombergs because the power valves don't open until full throttle is reached.
 
modeladan said:
I have a Zepher manifold with two Ford 94 carbs, are the 94 carbs suitable or should I use another carb. The 94's need rebuilding so at this point I what to find the best carb.
Click to expand...

Dan,
Years ago, I had a conversation with a carburetor man named Jerry Jobe.
I asked Mr. Jobe the question that you've asked, i.e.- what to use on a warmed up four banger A/B engine. He explained a formula for what he recommended for my use....that is two stromberg 81s.
Google his name and you will understand why I asked him, and followed his advice..happily:) !
 
I run two 94's, fresh motor, 5.5 head, Stipe 350 cam, counterweighted crank, 27 lb flywheel, Mallory Unilite, full balance. I like the 94's w/stock jets, 3.5 power valves (per Jobe) and straight linkage. Runs good with no hesitations, flat spots or sooty/rich spark plugs. I live atop a 3 mile 7.5% grade so it gets a workout.
 
Jim Brierley said:
dual 94's should work fine with a little tuning, most likely smaller power valves and/or ones that open with lower than stock vacuum. I prefer Strombergs because the power valves don't open until full throttle is reached.
Click to expand...
Not 100% percent true... With a Stromberg carb, if all parts are functioning as they should, the powervalve starts to come to the party the moment the pedal is stabbed, due to the hydraulic action of the accelerator pump and becomes fully open at the bottom of the stroke.
If pedal is stepped on less violently, then yes, it opens at full throttle because of the built-in bypass valve in the end of the pump.
 
I run two 94's on one of my engines it runs very well. But it is not stock, it is a four port flathead with a 7-1 Brumfield head plus I made my own intake.
But I would say any good A engine with the right intake, and cam should run good, with the right tuning.
 

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thanks guys, sounds like for the most part there is a positive filling on using the "94"
write now I have three 94 carbs to make two
 
Look at them carefully, some vent out the top outside of the venturi and would be scary over a hot exhaust if the float stuck.
 
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