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03-10-2020, 02:05 AM | #1 |
Junior Member
Join Date: Jun 2015
Location: B.C. Canada
Posts: 6
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Stromberg WW jetting question.....
Hopefully someone on here can help me out. I have a Merc 255+.040 , EAB heads, 1CM cam & Merc 4 bolt manifold already bored out for 2G . But I picked up a Stromberg WW (approx. 275cfm) for a '58 Buick 364cid with 056 main jets. Obviously going to be way to rich. So I was going to buy a few jets based on the 2G jet sizes of 51, 52 , 53, 54 that most people on this board have used BUT! I'm wondering if I should base the jetting on a a Stromberg 97 jetting for this motor. If so what would be a good starting point?
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03-10-2020, 04:24 AM | #2 |
Member Emeritus
Join Date: May 2010
Location: Fitzgerald, Georgia
Posts: 2,204
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Re: Stromberg WW jetting question.....
Why do you think it will be too rich? The design of carbs, with venturi action, are "self-regulating" over a reasonably wide range. I would suggest giving it a try before purchasing unneeded extras.
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03-10-2020, 05:47 PM | #3 |
Junior Member
Join Date: Jun 2015
Location: B.C. Canada
Posts: 6
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Re: Stromberg WW jetting question.....
Thanks for the replies. I was considering to just run it and I will as I have before on other builds. I just figured someone was running a Stromberg WW on this site & had maybe gone through some jetting adjustments and I would have a ballpark idea of where I may have to start from.
I would still like to gather a few extra jets as back up for tuning as I am in a semi rural area and in Canada so the mail to here is slow(usually a takes couple of weeks) and I didn't want to order different jets every other day as I probably wouldn't be finished dialing it in until Xmas. |
03-10-2020, 05:03 AM | #4 |
Senior Member
Join Date: Apr 2015
Location: Sweden
Posts: 3,045
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Re: Stromberg WW jetting question.....
Jet size goes with carb size to get the mixture right...so canīt compare to a smaller carb or different type...
If you raised compression and upgraded ignition you may be able to economy tune it a bit leaner... |
03-10-2020, 10:41 AM | #5 |
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,316
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Re: Stromberg WW jetting question.....
I am running 2G's on bored out Merc manifolds on a couple of engines. They run fine with stock jetting. Both engines are larger than normal (255" and 258") and have aftermarket heads and ignition. I believe "Ol' Ron" on this board has also said that stock jet size on a 2G worked well for him also. Not exactly the same but very similar characteristics.
Last edited by tubman; 03-10-2020 at 11:50 AM. |
03-10-2020, 11:18 AM | #6 |
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Join Date: Jun 2010
Location: Detroit suburb, MI
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Re: Stromberg WW jetting question.....
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In other words, all carbs don't use a 50 to 52 main jet like the Holley 94 or 45's like the 97. Sal |
03-11-2020, 11:22 AM | #7 |
Senior Member
Join Date: Jun 2010
Location: Detroit suburb, MI
Posts: 3,706
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Re: Stromberg WW jetting question.....
I think your in the ball park with stock jetting (as is now). If you need main jets Uncle Max on this forum should be able to help you.
Sal |
03-11-2020, 01:40 PM | #8 |
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Join Date: Jun 2015
Location: B.C. Canada
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Re: Stromberg WW jetting question.....
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