 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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| nathanxnathan |
Jun 21 2022, 10:57 AM
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#2
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Member Group: Members Posts: 291 Joined: 16-February 18 From: Laguna Beach, CA Member No.: 21,899 Region Association: Southern California |
1.7 with a big bore isn't a 1.7 anymore — I think knowing your displacement is important here. I found 28's to work well for my 1.7 but I like the advantage that a tighter vacuum signature offers at lower rpm's vs tuning for max power at higher rpm's. Maybe 30's I'd try for your situation, but I'd go to the trouble of getting 28's 30's, and 32's and see how it feels with all of them — not that hard swapping them out really.
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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 nditiz1 28's will be fine. I have run them up to a 20... Jun 21 2022, 11:05 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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