 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: 89 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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| Eric_Shea |
Jun 21 2022, 08:59 AM
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PMB Performance Group: Admin Posts: 19,278 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains  |
My spreadsheet coincides with @GregAmy's graph in his link as well. 31 is what it calculates to. For best drivability (where you will spend "most" of your time), I'd agree with 28-30 being your sweet spot. With your altitude and displacement, I'd also shoot for:
150 Mains 175-195 Air Correction 45-50 Idle jets (45 may be too small) |
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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 nathanxnathan 1.7 with a big bore isn't a 1.7 anymore — I ... Jun 21 2022, 10:57 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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