09-04-2016, 09:56 AM
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#1 |
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Senior Member
Join Date: May 2010
Location: OKC / Tonkawa, Ok.
Posts: 1,977
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Zenith Mod
Working on a Canadian built 31 roadster and when pulling the Zenith 2 carb apart I noticed these mods. Seems to me like I have seen it before but I can't recall where. Is this a modern replacement?
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Oklahoma City Model A Restorers Group. |
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09-04-2016, 10:11 AM
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#2 |
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Senior Member
Join Date: May 2010
Location: Young Harris, GA
Posts: 1,815
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Re: Zenith Mod
That is a "pressure balanced" carb. The original bowl vent has been plugged and a new path has been machined into the body and venturi to vent the bowl out to the air inlet.
This allows you to run an air filter and not have it make the carb run rich if the filter is a bit restrictive. HTH.
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Jim Cannon Former MAFCA Technical Director  "Have a Model A day!" |
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09-04-2016, 06:59 PM
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#3 |
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Senior Member
Join Date: Jan 2014
Location: Arcadia, CA
Posts: 145
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Re: Zenith Mod
I don't think it was done correctly. The air vent passage should go from the float chamber to after the air cleaner, but before the choke.
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09-04-2016, 07:27 PM
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#4 | |
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BANNED
Join Date: May 2010
Location: Michigan / Ontario border, Sarnia, Ontario. 50 miles from Detroit and 150 from Toronto.
Posts: 5,800
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Re: Zenith Mod
Quote:
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09-04-2016, 09:18 PM
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#5 |
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Senior Member
Join Date: Mar 2013
Location: San Antonio
Posts: 177
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Re: Zenith Mod
That is exactly how mine looks and was done my a man who's name on eBay is tazzmann if I remember correctly. After years of abuse it still runs great, not as good and when i got it from him but still fantastic. Best carb I've ever run on my pick up
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09-06-2016, 10:01 AM
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#6 |
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Senior Member
Join Date: May 2010
Location: maryland
Posts: 183
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Re: Zenith Mod
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09-06-2016, 10:26 AM
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#7 | |
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Senior Member
Join Date: May 2010
Posts: 2,594
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Re: Zenith Mod
Quote:
If you open the choke and look inside at top of the throat, the port is behind the choke plate... that is if you close the choke; the port is behind the plate and not visible. When I tested it briefly, I noticed that you can close the choke with engine idling and the engine does not stall out. |
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09-06-2016, 11:23 AM
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#8 |
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Senior Member
Join Date: May 2010
Location: OKC / Tonkawa, Ok.
Posts: 1,977
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Re: Zenith Mod
Is this mod actively being done now for resale or is it a garage mod and by who?
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Oklahoma City Model A Restorers Group. |
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09-06-2016, 12:07 PM
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#9 |
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Senior Member
Join Date: Jul 2011
Location: Redondo Beach, CA
Posts: 5,848
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Re: Zenith Mod
Renner's Corner pressure balances carbs (and flows jets) altho I don't know if their modification is like this one.
Last edited by Y-Blockhead; 09-06-2016 at 12:33 PM. Reason: Correct grammar. |
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09-22-2016, 02:27 PM
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#10 |
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Senior Member
Join Date: Jul 2015
Location: SouthWest Michigan
Posts: 363
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Re: Zenith Mod
Just Talked with Dave Renner and this is how he Pressure Balances the carbs he builds
I Explained to him what i was thinking on how I wanted to do this and, he agreed it is basically the same Tinkirk/Terry |
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