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By 1946international - 3 Years Ago
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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
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By DryLakesRacer - 3 Years Ago
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Using 2 blanks, make each carb run in the center position as a single. When complete and all run, install all 3 with your progressive linkage. May be a little time consuming but has always worked for me with multiple carburetors. A unisyn can help proper idle. I have always idled on all carbs. Which manifold are you using. It does make a difference.
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By 1946international - 3 Years Ago
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The manifold is the lower performing Offy I'm sure you know the one. I have it running great with the one carb idles good also.
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By Ted - 3 Years Ago
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Not sure of the mentality of putting leaner jets in place when removing or blocking the power valves. It’s normal practice to actually increase the jet sizes when disabling the power valves.
I will typically barely open the throttle openings on the end carburetors to ensure that the blades do not stick in the bores and rely on the center carburetor for most of the idle requirements. A quarter to half turn out on the idle mixture screws for the end carbs will also let just enough fuel run through those end carburetors in normal running to prevent the fuel from becoming stagnant if not opening them up very often.
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By 1946international - 3 Years Ago
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Ted, you are right I'm up to 55s in the secondarys now and it is running better. I hooked up an air-fuel meter to get to this point and just need to start going on test runs to fine tune. the jets I mentioned in my first post was just what was in the carbs when I started. I don't think I will have any time to get back to it until Tuesday.
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