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Big Block Talk! Everything about swapping a big block engine into your cart!



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Old 11-15-2020, 07:29 PM   #71
slonomo
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Default Re: Vanguard 23 Carburators

I forgot to add:

I believe the 34mm carb is too big for this engine for just putting around. For wide open performance, like in a mudboat for example, it's fantastic. But for a golf cart that gets used at low rpm and idles a lot, I think the carb is just too large.

The main problem I saw with this setup is that there was always a high amount of black soot in the exhaust pipe, so that's unburned fuel. The more soot, the more rich the a/f mixture is. This is by no means scientific, but if I cleaned the tailpipe with carb cleaner really good, it would only take approx 10 minutes of run time to get a pretty thick black coating.

Because of the rich mixture at low rpm, one cylinder would always foul out. After replacing spark plugs many times, and trying 3 different brands, I would still see the plugs foul out at random times. Sometimes it would happen on one ride, sometimes it would take 3 or 4 rides to foul. Nonetheless, the fouling was occurring and was frustrating.

The rich mixture was not able to be fixed with the pilot circuit. I had the pilot screw adjusted perfectly for idle with the jet that came with the carb, and it would idle smoothly at 1100 rpm. It did have a tendency to settle to idle pretty slowly.

I tried the next size pilot jet and it wouldn't even idle no matter how I adjusted it.

Just wanted to give the info for anyone who thinks they might want to try this mod.

I'm thinking a 30mm carb would do much better for better driveability, maybe even a 28mm. The stock 2 barrel carb is 24mm per cylinder, so a 30mm or 28mm would be a larger amount of air/fuel.

Good luck to anyone who wants to try this. I definitely think a Mikuni is the way to go, but just smaller than 34mm.
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Old 05-10-2021, 05:56 AM   #72
slonomo
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Default Re: Vanguard 23 Carburators

bump for Nitro
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Old 07-01-2021, 05:29 AM   #73
slonomo
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Default Re: Vanguard 23 Carburators

Just did some digging and I found that some atv's come with mikuni CV in 28mm and 30mm. For my 16hp Vanguard build I think I will try that size and see how the throttle response is. I'm a fan of those carbs because they are very forgiving with the throttle position and almost self correct based on vacuum, not just on throttle position.
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Old 07-01-2021, 10:16 AM   #74
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Default Re: Vanguard 23 Carburators

Thanks for testing slo, I yet purchased a carb/intake yet for my 23hp build
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Old 08-07-2022, 12:28 PM   #75
panteramatt
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Default Re: Vanguard 23 Carburators

Think you should try a flat side carb next. The throttle response should be way better.
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