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EFV-8 Club Forum / General Ford Discussion / Dual carbs

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Discussion Topic: Dual carbs

nelsonford

07-22-2014 @ 3:27 PM

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Does anyone know a good book or web sit where you can get information on setting up dual carbs? Like correct jet sizes for Stromberg 97'S. Do you need an electric fuel pump (6V) with a pressure regulator using the standard pump as well and filters?
I have been running 94's with just the standard ford pump for years but with problems and now they are leaking pretty badly. I found 2 97'S which look in pretty nice shape one is a factory rebuild still in th box so I want to try them.

Thanks, Nelsonford

ken ct.

07-22-2014 @ 3:55 PM

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I would change MJ's to .043 or .044's and possibly the PV's to #67 or # 68. OMO. Other than that same hook ups as the 94's. ken ct.

40 Coupe

07-23-2014 @ 4:30 AM

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There does not appear to be one source of information. You may want to SEARCH on fordbarn.com for info regarding syncing the two carbs. You don't indicate what engine but I have a mild 21 stud and use .043M & 69PV. the 97 Std sizes for one Carb on a manifold are .045M & 65PV

Whifty

07-23-2014 @ 2:46 PM

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This might help. http://www.flatheadv8.org/rumblest/fuel.pdf

07-24-2014 @ 10:14 AM

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I have no idea which engine you are planning to put dual carbs on, but I am getting ready to do this on a '36 LB, 21 stud engine that is basically stock except for a + 0.030 over bore. What I am using is an Eddie Meyer's 2x2 intake with two Stromberg 81's that are rebuilt with stock jets and power valves. Choke mechanism locked open on one carb.

John

This message was edited by JM on 7-24-14 @ 10:18 AM

supereal

07-24-2014 @ 2:44 PM

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The problem with the Stromberg carbs is that they are difficult to work on. Many multi carb setups used them because they needed less space between them. Be sure that the linkage is set so the throttle plates are in exact sync. The stock fuel pump should be sufficient. Most carb leaks are due to a warped body or stripped screw holes. We check them by placing emery paper on a piece of glass, then rubbing the gasket face on the paper. You will be able to see if the part is warped, and where. A vacuum gauge is a good way to adjust the carbs. doing so is tricky, as the increase in the venturi capacity skews the vacuum, making idling, in particular, uneven.

nelsonford

07-25-2014 @ 6:45 AM

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The car is a '48 Merc coupe. The engine is stock with old Edelbrock heads & Fenton intake and Fenton headers with 2" pipes and smittys.

I found a snag, one of the pair of carbs is a 48 with the larger venturi. Anyone want to trade a 97 for a 48?
I may have to work on the 94's a bit more. I have more parts.

The engine did run good for a while but now breaks up at higher rpms. The carbs seem to leak badly at the accelerator pumps and stop after it runs for a while. I have power valve plugs and #51 jets in both.

Thanks, you guys are great.
Nelsonford

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