Holley 94
- Thread starter 4tford
- Start date
Bruce Lancaster
Member Emeritus
Whatever he changed will likely need to change back. This can require a lot of analysis, because people have the strangest ideas about the way carburetors work, how they relate to displacement, etc. AND the same folks are apt to overlook basics like float setting and gasket fit.
First, find out what they are...if actually Ford, model will be on left of float. "94" has become a meaningless internet term applied to a lot of very different carb models, and everyone seems to think that 94 is a model ID AND that everything that resembles a 94 is one. Identify, carefully, and if they are potentially a good choice THEN totally disassemble and with parts chart in hand try to figure out if anything was messed with.
Remember that current statistics show that 87.04% of people who work on carburetors should have their tools confiscated immediately.
First, find out what they are...if actually Ford, model will be on left of float. "94" has become a meaningless internet term applied to a lot of very different carb models, and everyone seems to think that 94 is a model ID AND that everything that resembles a 94 is one. Identify, carefully, and if they are potentially a good choice THEN totally disassemble and with parts chart in hand try to figure out if anything was messed with.
Remember that current statistics show that 87.04% of people who work on carburetors should have their tools confiscated immediately.
Bruce Lancaster
Member Emeritus
Jets needed should be stock or pretty close...without identifying carb, stock jet size can't be determined. Slight leaning is often appropriate on multiple applications to accomodate shorter passages, but the key word is slight. This is an area where lots of unreasoning changes are often made...carbs just roughly measure air passing though and admit a suitable amount of gas in the main jet circuit, they don't care what make the air pump below is!
Carb model will be cast into L side of bowl to give a starting point for figgerinout things.
Idle circuitry adjusts to make the motor happy, power circuit sometimes need change of power valve vacuum rating on engines with lower than normal vacuum.
Carb model will be cast into L side of bowl to give a starting point for figgerinout things.
Idle circuitry adjusts to make the motor happy, power circuit sometimes need change of power valve vacuum rating on engines with lower than normal vacuum.
AnthonyG
Well-known member
I'm sure I'll get spanked for this approach but here goes. Practically speaking if they look cruddy take them apart and check / rebuild as Bruce indicates. But if they look clean / nice and don't leak the guy who had them on his small block Chevy probably didn't do anything to them any different then you would do setting them on your flatty. My bet is he put them on his manifold and set up with a vacuum gauge or a Tach. adjusting the mix screws till it ran and sounded good. Probably if rough / rich went to smaller jets or power valves if smooth ran it for a while and checked his plugs and if they were dark then considered going smaller on the jets or power valves or hotter plugs. The same as one would do if on the flatty. Not too dark maybe leave alone and go to a hotter plug, if darker maybe go on jet size smaller. If really dark maybe a combination of both. My point is, he probably didn't have to do anything much different than setting on any small displacement engine and if a decent mechanic would do the same during the set-up regardless of the engine. I would put them on the flatty and do the same. Proceed with the normal set up on the flatty using a vacuum or tach gauge and start by adjusting the mix screws and see how it runs. If it runs but rough move forward to fine tune changing jets, power valves, plugs as / if necessary. Looking for the obvious. Worse case you'll fowl your plugs and have to clean them.
Having worked in the Holley Tech tent many years ago, I can't begin to tell you how much junk I looked at with "...my buddy sold me this or I got it at a swap meet..." Wrong parts, metering blocks, jetting, etc. Unless you know what you are looking at, stay away from the junk when you think it's a great deal.
Bruce Lancaster
Member Emeritus
If you think they can screw up a single four barrel, wait til they get into multiple carbs! Tiny jets, removed power valves, calling all these carbs 94's (Note that the ones under discussion are STILL entirely unidentified!) and applying 94 specs and jets to a much larger Y block carb because "it's a 94! Thht's what model carb it is!", etc.