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John Moxon 
Samba Moderator
Joined: March 07, 2004
Posts: 14174
Location: Southampton U.K.
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henry roberts
Samba Member
Joined: February 24, 2003
Posts: 1290
Location: australia
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 Posted: Thu Nov 19, 2009 6:37 am Post subject: |
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| huge thanks to tom for sharing this info. |
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Peter_Plade
Samba Member
Joined: January 09, 2005
Posts: 552
Location: Denmark
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| Posted: Fri Nov 20, 2009 12:50 pm Post subject: |
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Very nice information!
I don´t understand this with the 28PCI FVEE "blended top" what does that mean?
I can see the choke has been taken out also, is this the complete choke with axle and all?
I´m thinking about taking the choke out of the carb´s on my Express motor, they are not in use anyway!
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grueni
Samba Member
Joined: November 03, 2008
Posts: 582
Location: Germany
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| Posted: Fri Nov 20, 2009 1:59 pm Post subject: |
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its crazy how close the carbs flow are in stock form to the stock hp configuration. when calculating cfm into HP.
can tom or someone say something about how to use thes flow numbers?
i mean a stock 28 pci can also do to 50 hp on a judson engine... |
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bvilletom
Samba Member
Joined: January 22, 2006
Posts: 95
Location: cedar rapids iowa usa
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| Posted: Fri Nov 20, 2009 8:52 pm Post subject: |
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Peter
On the F-vee the choke is completely removed, all and any rough edges anywhere are streamlined, the acc. pump nozzle area is narrowed & airfoiled, even the air corr jet is rounded and streamlined, the throttle shaft narrowed a lot & polished. Anything to make the carb interior have non-turbulent, laminar air flow helps. Removing the choke on an otherwise stock carb is barely noticeable in improvement. Its like do the bigest restriction first, like the weak link of a chain. Do the venturi first.
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bvilletom
36hp Challenge record holder New Age 126.236mph
1970 Porsche 914/6 – 2 liter LSR record holder
1992 Metro Sedan – 1 liter LSR records
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ShadetreeVEE
Samba Member
Joined: July 01, 2006
Posts: 242
Location: Chico, CA
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| Posted: Sun Nov 22, 2009 10:47 am Post subject: |
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| awesome info on the chart! i have dual zeniths and its nice to see the difference between the modified version and the stock. however (and i cant seem to find the link) but theres a guy on the 356 registry who bored his zeniths out to a 36mm throttle bore and id love to see the comparison side by side. if i recall correctly the Solex P-II was still ahead in overall CFM but the pure velocity of the zenith was far superior to the solex. |
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Peter_Plade
Samba Member
Joined: January 09, 2005
Posts: 552
Location: Denmark
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| Posted: Mon Nov 23, 2009 12:07 pm Post subject: |
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| bvilletom wrote: |
Peter
On the F-vee the choke is completely removed, all and any rough edges anywhere are streamlined, the acc. pump nozzle area is narrowed & airfoiled, even the air corr jet is rounded and streamlined, the throttle shaft narrowed a lot & polished. Anything to make the carb interior have non-turbulent, laminar air flow helps. Removing the choke on an otherwise stock carb is barely noticeable in improvement. Its like do the bigest restriction first, like the weak link of a chain. Do the venturi first. |
Okay thank you, and I´m allready planning to get the venturi machined bigger.
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bvilletom
Samba Member
Joined: January 22, 2006
Posts: 95
Location: cedar rapids iowa usa
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| Posted: Sun May 01, 2011 4:03 pm Post subject: |
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Folks have been wanting me to do a flow comparison between the Wolfsburg West kit parts and the original Okrasa parts. I got the setups done & here are the figures. In a nutshell the carbs are not quite as good but the manifolds have way more potential.
Note: The replica intake manifold are larger everyplace which increases theair flow. However, they need some T.L.C. work in the runners to get it all.
All tested by Tom Bruch (Bville Tom) on a Superflow 110 @10 H20 (4-28-2011)
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bvilletom
36hp Challenge record holder New Age 126.236mph
1970 Porsche 914/6 – 2 liter LSR record holder
1992 Metro Sedan – 1 liter LSR records
1987 Chevy Turbo Sprint – under construction |
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36hplandspeedracer
Samba Member
Joined: January 30, 2006
Posts: 847
Location: Ivins, Utah
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| Posted: Sun May 01, 2011 10:11 pm Post subject: |
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| bvilletom wrote: |
Folks have been wanting me to do a flow comparison between the Wolfsburg West kit parts and the original Okrasa parts. I got the setups done & here are the figures. In a nutshell the carbs are not quite as good but the manifolds have way more potential.
Note: The replica intake manifold are larger everyplace which increases theair flow. However, they need some T.L.C. work in the runners to get it all.
All tested by Tom Bruch (Bville Tom) on a Superflow 110 @10 H20 (4-28-2011) |
Thanx Tom for taking the time to test these new components and share this information with the rest of the 36 world. As a side note, while visiting with Wolfsburg West reps at the Bug In today I found out there are more 36hp perfromance components being developed. Stay tuned to Vintage Speed and the Wolfsburg West newsletter for more announcements over the next few months.
A huge thanx to Tony and the crew for making modern performance available to 36hp drivers.........................
Burly |
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splitpile
Samba's Worst Speller
Joined: May 03, 2000
Posts: 5927
Location: back to living where hell meets the suface
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| Posted: Mon May 02, 2011 6:45 pm Post subject: |
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| bvilletom wrote: |
Folks have been wanting me to do a flow comparison between the Wolfsburg West kit parts and the original Okrasa parts. I got the setups done & here are the figures. In a nutshell the carbs are not quite as good but the manifolds have way more potential.
Note: The replica intake manifold are larger everyplace which increases theair flow. However, they need some T.L.C. work in the runners to get it all.
All tested by Tom Bruch (Bville Tom) on a Superflow 110 @10 H20 (4-28-2011) |
Got my work cut out for me now Tom. Before I do any other changes to my engine I'll tune the carbs and intakes to see what improves.
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Roadcow
Samba Member
Joined: November 14, 2003
Posts: 1012
Location: Stockton, Ca. area
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| Posted: Tue May 03, 2011 9:54 am Post subject: |
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Thanks for sharing Tom!
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