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11-16-2019, 12:04 PM | #21 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,436
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Re: Vanguard 23 Carburators
I haven't done anything to the intake. That's a good point. Maybe there is something on the intake causing an imbalance in the air flow.
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11-16-2019, 03:41 PM | #22 |
Crazy Ole Man
Join Date: Jan 2016
Location: Owego NY
Posts: 2,758
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Re: Vanguard 23 Carburators
The flow is slamming into the flat spot in the middle. Which cylinder is fouling the short leg or long leg of the manifold? Look at the picture and you'll understand what I'm saying.
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11-16-2019, 07:45 PM | #23 |
Gone Wild
Join Date: Jun 2011
Location: Kingston Springs Tn.
Posts: 874
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Re: Vanguard 23 Carburators
SLO that manifold I got from you has a plenum instead of two holes does yours have two holes ?
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11-18-2019, 09:02 PM | #24 |
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Re: Vanguard 23 Carburators
I think you guys are right. The adapter was just an open plenum, no holes. It's the plug in the right cylinder if you're facing the crank, by your pic it's the long one.
So Shepard, you're saying I need to radius the flat spots, basically do a port smoothing job. That's a lot of material in that location. I'm going to need a better porting tool. What type of bit do I need to remove a high amount of aluminum? I have the fine stuff for blending and polishing. |
11-18-2019, 10:09 PM | #25 |
Just Gone
Join Date: Sep 2015
Location: North Carolina
Posts: 3,549
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Re: Vanguard 23 Carburators
A carbide tip burr should do fine with the soft aluminum.
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05-08-2020, 07:37 AM | #26 |
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Re: Vanguard 23 Carburators
Update:
The adapter I used (for HF670) has an open plenum design, and the 23 Vanguard has a dual intake plenum. So it was pointed out that the air/fuel mixture is flowing through the open plenum then hitting the flat spot on the vanguard intake where it splits into two intake runners. To remedy, I simply removed the plastic spacer and shaped it. I used a dremel tool with a sanding drum. Worked really well, didn't melt the plastic. I just removed small amounts, then checked it often. I think this will eliminate any turbulence created by the flat spot, it's not shaped with a sharp angle. |
05-08-2020, 07:48 AM | #27 |
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Re: Vanguard 23 Carburators
This mod to the intake did not cure the flooding issue. It runs well for 5-10 minutes then floods the right side cylinder (when facing the crank). Many of you have commented and helped be figure this out, thank you. It's obvious that this carb is too big for this type of engine.
The next step is to go smaller. Blackwater Performance and Performance Vtwins both sell the same carb for their Vanguard builds. The 34mm Mikuni VM. |
05-08-2020, 07:52 AM | #28 |
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Location: Medina, Ohio (NEOHIO)
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Re: Vanguard 23 Carburators
Blackwater Performance sells an intake made to adapt this carb, it's much different than the one I have. Might give that a try. They do have a complete kit, but it's for a mud boat. They will sell just the carb, or any other parts you might want. They are NOT a sponsor, but I feel this is an option that is not available from a sponsor. Mods, if this is against the rules please let me know.
https://backwaterperformance.com/col...rd-21-to-23-hp https://www.youtube.com/watch?v=YZfampE1Blc |
05-08-2020, 09:05 PM | #29 |
VC 460 CLONE GONE WILD
Join Date: Oct 2014
Location: Ray BY The Bay NJ
Posts: 10,633
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Re: Vanguard 23 Carburators
Performance 670 also recommends the 34 mm mikuni on their engines with about the same displacement as the vanguard.
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05-09-2020, 09:47 AM | #30 |
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Re: Vanguard 23 Carburators
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