so have read through a ton of the holley 94 technical articles for multiple setups and most touch on how to adjust idle mixture but none really touch on this so perhaps its ***umed we should know what to do Rebuilt all 4, new fuel lines. etc. got them on and able to get the car running only after manually opening up the throttles on each just a hair, as I haven't put the linkage or throttle back on. but for setup should all 4 idle speed adjustment screws be set? One of the articles I read mentioned just one on each side was ok (though that was for strombergs, and no mention of intake). My intake is an Offenhauser which looks like it feeds one carb per 2 cylinders if that changes things. Thoughts?
Call Charlie Schwendler 1-716-662-9159, or go on The Ford Barn, where he is Charlie NY. Charlie is probably the best guy in the country for 94 carburetors. He is a stand up guy, and will give you good advice.
I been running 4x2 a long time,I blocked off all power V,linkage works all at one time,adjust each carb{both sides},set up is with out linkage using a Unasink one at a time tell they match. Jetting in my case turn out stock worked/with out power valves. Fuel PSI 2lbs. I made my own log intake from old drive shaft,It's designed by me so there is balance runners between all crabs inafect. Can't say for other intakes,but my own has carbs,each venturi lined up with ports/straight above each intake valve as much as can be done. I made a devider in each stand tube,so that intake ports are not together tell they enter main log. [many 4x2 & 6x2 & 8x2 factory intakes are open between ports right above head.] This is 292 Y-block Ford V8.
All the adjustments should be made to each carb. If you can keep it idling, start adjusting each one just a little moving around to a different carb after each minor adjustment. You should start to hear it run better as you narrow in on the mixture. It will take a bit of fiddling till you get there. If you can get ahold of an air/fuel ratio gauge, it would really help speed up the process. Once you get the mixture and idle speed set, then start attaching the linkage. If the manifold has separate runners to each pair of cylinders, then getting the mixture right is very important for even burning cylinders. Now, if the manifold has mixture tubes which connect multiple cylinder pairs, all four carbs will mix and act as one big one, so each carb will not be as critical.
You ask;"One of the articles I read mentioned just one on each side was ok " I think no matter what type carb or style,if you totally close down any part,then getting flow started again adds to prob. s
Makes sense. Was just that when I had each of the throttles slightly cracked open (i.e. had the idle speed screw just nudging them open on all 4 in what seemed like the smallest amount possible), RPM was pretty high. But then again I guess that's when I need to start adjusting the mixture. I do have a Unisync so will get that out, just seemed odd that the one articles (in the Holley tech section) said you could just have the idle speed set on just a subset of the carbs. Made me think it would be hard to sync if only some had a head start opening at zero throttle position.
Are we talking idle speed or idle mixture? I think there is some confusion here. Sent from my iPhone using H.A.M.B.
Idle speed, not the 2 idle mixture screws. I had each of the mixture screws out 1 1/2 turns out, on all 4 carbs. Not able to start the car. Adjusting each idle speed (the one screw that nudges up against the throttle) to where it just cracked open the plates the car fired right up, though the RPM was pretty high. backing off the idle speed on all but 1 dropped RPM down to "normal" but then figures I should get some insight onto how this should be done, and noticed most of the posts never mentioned where to start with respect to the idle speed adjustment with multiple carbs, just the mixture adjustment part of it.
Buy a Uni-Syn available from Summit and others I've set multiple set-ups with one and had very good luck. I like idling on all carbs whether progressive or not... good luck
Idle should be set on all four carbs, same as the mixture screws. Close all but one to get the car started, then open a second one to just bring idle up a 100 rpm or so. Move to the third and open it, idle will climb ever so slightly, open just enough you know its open. Move to the forth and open it same as the others. Once all four are open, start backing them off one at a time till you get the idle where you want. Each one should have some effect on the speed.
Thanks! That's a procedure I can wrap my head around. I've got the Unisyn in hand as well so will layer that on. Do you Sync only after the above is done?
Thanks guys, just to update. Got all four carbs synced up this weekend, and its running great. Carbs were rebuilt, I had changed the PV to a 2.5 on all 4, and the 283 SBC seems to be running like a champ. Still have some linkage work to do.
Missed your Friday post but this is what I would have said. My experience has been get it "good enough" by ear then start with the Uni-Syn. It will take some time. Just set it on each carb first to see how close you are. After every change, even small. Set it on the 3 other carbs as they usually change even tho you are adjusting another carb.
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