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Mercmarc · 11-05-2021, 01:12 PM

Good morning chuck stevens, Gene1949 and robib

Hello Chuck,

The Lucas additive is to address any residual alcohol in the fuel, and the chevron high test was to use a fuel with a minimal alcohol content. The Marvel Mystery oil was recommended to help offset any ill affects of California fuel on rubber parts, hoses, gaskets and the like.

I am working with Charlie ny on a distributor as we speak.

Hello Gene1949,

Thank you for your suggestion on float level. I raised the top of the float to with in an 1/8 of and inch of the carb top. No change. Great information on the multiplier for troubles.

I have asked Charlie to build a distributor with points and condenser and I will ask for the vacuum can version.

Hello robib

I understand and concur about the 3 circuits in the carb and I have the same issue of not knowing the best way too increase fuel or reduce the air in the transition circuit. My gut feeling is to increase the size of the venturi metering rods. Then I should be able to scale back the main jet size to the more common 49 to 52 sizes that have been suggested.

I believe a possible problem lies in the emission criteria for california. A bigger main jet is less affective if the venturi metering rods are restricted to much.

When my vacuum drops enough to open the power valves the engine performs great.
I have installed jets from 49 to 62 in small increments with improvements along the way but not correcting the actual problem. With such a large increase in the jet sizes and only a moderate change in drivability I feel the new carbs are flawed.

I have several ford script model 94’s but the venturi parts did not want to interchange with the new carb bowls and frankly the ford script bowls were in pretty bad shape. I was hoping to swap the venturi bowls using an earlier type venturi system and see if that corrected the problem.

As I mentioned earlier, even with such a large increase in the jets and I could not get enough fuel to soot up the plugs I believe the main jets are not the only trouble with these new carbs.

I will install Charlie ny’s distributor and begin from there on the air fuel troubles.

Just another note, I have run two electronic GM distributors from Total Street Performance on this engine and carb combination with no change in drivability.

Respectfully

Marc

11-05-2021, 01:12 PM	#39
Mercmarc Member Join Date: Aug 2017 Location: Roseville, Ca Posts: 84	Re: Lean MisFire Good morning chuck stevens, Gene1949 and robib Hello Chuck, The Lucas additive is to address any residual alcohol in the fuel, and the chevron high test was to use a fuel with a minimal alcohol content. The Marvel Mystery oil was recommended to help offset any ill affects of California fuel on rubber parts, hoses, gaskets and the like. I am working with Charlie ny on a distributor as we speak. Hello Gene1949, Thank you for your suggestion on float level. I raised the top of the float to with in an 1/8 of and inch of the carb top. No change. Great information on the multiplier for troubles. I have asked Charlie to build a distributor with points and condenser and I will ask for the vacuum can version. Hello robib I understand and concur about the 3 circuits in the carb and I have the same issue of not knowing the best way too increase fuel or reduce the air in the transition circuit. My gut feeling is to increase the size of the venturi metering rods. Then I should be able to scale back the main jet size to the more common 49 to 52 sizes that have been suggested. I believe a possible problem lies in the emission criteria for california. A bigger main jet is less affective if the venturi metering rods are restricted to much. When my vacuum drops enough to open the power valves the engine performs great. I have installed jets from 49 to 62 in small increments with improvements along the way but not correcting the actual problem. With such a large increase in the jet sizes and only a moderate change in drivability I feel the new carbs are flawed. I have several ford script model 94’s but the venturi parts did not want to interchange with the new carb bowls and frankly the ford script bowls were in pretty bad shape. I was hoping to swap the venturi bowls using an earlier type venturi system and see if that corrected the problem. As I mentioned earlier, even with such a large increase in the jets and I could not get enough fuel to soot up the plugs I believe the main jets are not the only trouble with these new carbs. I will install Charlie ny’s distributor and begin from there on the air fuel troubles. Just another note, I have run two electronic GM distributors from Total Street Performance on this engine and carb combination with no change in drivability. Respectfully Marc