Is anyone running a Y block with three 94 Holley carbs? I just installed a set up on my 292 in my Model A and would like to get a starting point on jet size. What I have now are #42 jets in the two secondary carbs and #49 jets in the primary. I have plugged the power valves in the secondary carbs and have all three of the acc pumps in the #1 hole. This is using progressive linkage. What I have going on right now is that when the secondary carbs open the engine dies unless I cup my hand over either one of the secondary carbs, (choking out that one carb) when I do that is seems to run a lot better. So My thought is that it is too lean (at least on the secondary carbs) What are your thoughts? One more thing, my secondary carbs still have the idle circuits just the mixture screws are lightly seated, it idles fine. In Fact it runs fine with just the primary carb
What distributor are you running? I wouldn’t try running progressive on that engine. Especially if it running fine in one carb. I’d consider blocking off the two outer carbs and just run one.
I think you will need a lot larger jets in the secondaries , if you removed the power valve. I think as a rule you run smaller jets in the center carb and larger jets in the outer carbs! Bones
Start with standard jets in primary. - 51 ? Jet sizes should be standard or up to 3 sizes ? larger in secondaries to compensate for blocked power valves. Do you have the actual ‘94’s or the larger ones ? - that is different size jets again. .
I don't understand why you removed the power valves. I would first try putting them back and see what happens.
Probably won’t work with 3 stock pv’s. - most remove power valves from secondary’s to ease tuning of centre primary, - usually standard power valve, - other wise you have to work out vacuum, divide by two, ( some say add 1) and divide by three to size power valves (and I am not sure whether you possibly have to run fixed linkage for that to work.
Petejoe, I'm running the stock '57 and up distributor. Boneyard, YOU ARE SO RIGHT! I'm up to 55 and 52 in the secondarys now and it is getting better, a lot better. I have an air-fuel gauge hooked up and just running it in the garage so far. Next step is take it for a ride and watch the gauge. The only reason I'm using the 55 and 52 jets is because I don't have 4 of the same size as I get closer I will order a complete set in the range that is needed. THANKS for the help. Clem, yes the carbs I have are the actual 94 carbs. Oh, and thanks for that link, I had found that in a search a while ago but could not find it again when needed. thanks again.
Here’s some more,- not all work, but some are still there….. https://www.jalopyjournal.com/forum/threads/links-to-holley-94-technical-info.286574/
I think the theory is to run the center carb close to stock jets for throttle response and clean burning at low to mid throttle. Then have the outside carbs run a little rich for power at wide open throttle. If you remove the power valves then you may need several or more steps up in jet sizes. On the Ford FEs the outside carbs don’t have any power valves, but the center one does. Since the outside carbs only come in at high throttle the power valve would always be open when the out side carbs are operating. Also, the accelerator pumps must be working properly, as the outside carbs open very rapidly and if you don’t get the extra squirt of fuel at the right time, you will get a “cough” before it takes off! Just my understanding. Bones
Bones, I have heard some guys disconnect the accelerator pumps but for the reasons you mentioned I'm still running mine
I would love to know what @****ster27 recommends. One of several guys on here that has a wealth of knowledge, and sharing it would be appreciated. I also wonder how they would perform running them as fixed linkage.
yes, I hooked mine up and that is how I got to where I am with it now. Have gone way richer with all three carbs and it is much better but I still need to get it out on the road and see. Thanks for the tip
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