| V8JR | -- 04-23-2020 @ 12:51 PM |
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Running a Holley 94 carburetor on a 1940 Ford - what max fuel pressure can the Holley 94 take before problems arise? I understand that Stromberg 97 carburetors are very sensitive to pressures above 3 psi - Thanks for any info.
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| mfirth | -- 04-23-2020 @ 1:06 PM |
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V8Jr, 2.5- 3 lbs should be fine. You still may have some "flooding" symptons due to our rotten fuel boiling over. Enjoy that 40 !
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| V8JR | -- 04-23-2020 @ 10:02 PM |
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Mfirth - Thanks for info on the pressure. If the 94 floods does it just go down the venturies into the engine? Or does it flood out of the carburetor top like 97's do when the float sticks? - V8JR
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| mfirth | -- 04-24-2020 @ 5:27 AM |
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Mostly into the intake, some may squeese by the throttle shaft.& drip onto the exterior of the intake. Daytona Parts or Speedway have or had insulative base gaskets that help keep the carb. cool. I used 2 of them & it made a difference.
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| TomO | -- 04-24-2020 @ 7:18 AM |
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If the float does not stop the flow of fuel, it can dump fuel down into the venturis and out the top cover gasket. Either one is dangerous and can cause damage to the engine or the car. Are you having problems or just checking before installing an electric pump? Tom
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| V8JR | -- 04-24-2020 @ 10:13 PM |
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Tom - At this point just checking. I am running a Stromberg 97 and thinking of changing to a Holley 94 as I am having a lot of flooding out the top of the 97 through the accelerator pump rod hole in the top of the carburetor. I believe due to the float not shutting off the fuel. I have had three different carburators on engine. I am running an electric fuel pump with a pressure regulator set at 3psi - V8JR
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| 1931 Flamingo | -- 04-25-2020 @ 7:17 AM |
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FWIW, try lowering the FR pressure to 2......... Paul in CT My 40 runs 2 97's with I believe an Airtex pump w/no regulator and no leaks.
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| TomO | -- 04-25-2020 @ 8:17 AM |
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If you go back to a stock system, you will eliminate some of the extra fail points in your current system. The Ford / Holley carburetor is a more simple design and does give better performance then the Stomberg 97. A good rebuilt model 91-99, 21-29 or 59 will work good with a stock mechanical fuel pump. You need a solid 1/4" copper coated steel line from the tank to the fire wall for best performance. People say that the Dennis Carpenter carburetors work well also. With this setup you do not need a pressure regulator. Most pressure regulators that sell for less than $100 are the restrictive type. They restrict the flow of fuel so that it doesn't overfill the the carburetor bowl. This can affect performance at highway speed. The bypass type gives better regulation and does not restrict the flow of fuel. Different electric fuel pumps provide a more accurate fuel output pressure, so you can search for one that does not have a high output pressure that overcome your float. Good luck with whatever you decide. Tom
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| kubes40 | -- 04-25-2020 @ 8:30 AM |
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I'm with TomO on this. A properly set up STOCK system will start and run quite well. I solder the ferrules at each end of the fuel lines just like Ford did. That eliminates the possibility of any vacuum leak at those points. Ford wouldn't have done that if it were not necessary. As a side note... I still don't quite comprehend all of the guys that insist they NEED electric fuel pumps, etc. If that's true, why do each and every one of my cars start and run perfectly on 100% concourse correct systems? It's not magic folks... it's nothing more than making the necessary efforts to rebuild / restore PROPERLY. Mike "Kube" Kubarth
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| V8JR | -- 04-26-2020 @ 9:57 AM |
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All good info more me to digest - thanks much - V8JR
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| ken ct. | -- 04-26-2020 @ 11:25 AM |
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Use of a stock steel inlet needle that's been staked to the seat will most likely stop the sticky inlet needle and line is properly tightened. OMO. ken ct Keep pressure 2# max.
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