 Venturi on Weber 40s?, Venturi advice |
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| Boothy |
 Jun 21 2022, 07:10 AM
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#1
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Member  Group: Members Posts: 88 Joined: 17-January 19 From: Abington, MA Member No.: 22,805 Region Association: North East States  |
Morning All,
I've searched but haven't located the info on venturi sizes for Weber 40s. I have a 1.7 with a big bore and CB carb cam. The Weber I have came with a bag of venturis so I'm trying to determine the right size. Thanks in advance! |
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| nditiz1 |
Jun 21 2022, 11:05 AM
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#2
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Senior Member Group: Members Posts: 1,190 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region 
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28's will be fine. I have run them up to a 2056 and were still fine. The main thing that it will do is move your power band. If when you are running up the tach you get to a part where your RPM increases, but you don't feel like you have any more power "flat" then you would want to increase the vents.
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Posts in this topic
Boothy Venturi on Weber 40s? Jun 21 2022, 07:10 AM
jaredmcginness Somewhere in the neighborhood of 28-32mm vents wou... Jun 21 2022, 08:12 AM dr914@autoatlanta.com Richard Parr at PMO is the authority. Nice guy, c... Jun 21 2022, 08:14 AM Shivers When I was running a 1911, I had 28's in my 40... Jun 21 2022, 08:18 AM GregAmy Halfway down.
http://www.914world.com/bbs2/index.... Jun 21 2022, 08:32 AM Al Meredith I have the Weber manual and it has graphs that giv... Jun 21 2022, 08:43 AM sportlicherFahrer Another helpful post I used for figuring sizes for... Jun 21 2022, 08:49 AM Eric_Shea My spreadsheet coincides with @GregAmy's graph... Jun 21 2022, 08:59 AM nathanxnathan 1.7 with a big bore isn't a 1.7 anymore — I ... Jun 21 2022, 10:57 AM
930cabman
28's will be fine. I have run them up to a 2... Jun 21 2022, 11:33 AM SirAndy I've searched but haven't located the info... Jun 21 2022, 01:00 PM Boothy As always, you guys are the greatest!
Thanks ... Jun 21 2022, 02:03 PM Boothy Right on velocity. Bernoulli's principle. An i... Jun 21 2022, 02:07 PM r_towle 28 Jun 21 2022, 06:49 PM |
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