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11-25-2016, 06:35 PM | #21 |
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Re: Stromberg BIG 97
I think that would be a Stromberg 48. Dave
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06-05-2019, 10:21 AM | #22 |
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Re: Stromberg BIG 97
Running this back up to see if anyone is running a Single Big 97 and what jets and power valves are working. They ship out with #56 jets in them.
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06-05-2019, 12:08 PM | #23 |
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Re: Stromberg BIG 97
If someone wouldn't mind, i'd like a tutorial on 2" hg depression. What is the "depression" concept.
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06-05-2019, 12:25 PM | #24 |
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Re: Stromberg BIG 97
Maybe Lincoln Jim in Wisconsin?
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06-05-2019, 01:10 PM | #25 |
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Re: Stromberg BIG 97
Recently I furnished the valve train for a 304 that is running 3 big 97's.
It could use a 4th because it is pulling about 2 inches of vacuum. Knowing the owner though, he may opt for electronic Hilborn's instead. |
06-05-2019, 02:04 PM | #26 | |
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Re: Stromberg BIG 97
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Quote:
The 2"hg depression being talked about is how a flow stand is set up to measure total CFM air flow capacity at a manufacturer's facility or other business. 2"hg is the same as 2" of manifold vacuum (mercury = hg). When flowing a carburetor, after mounting the carburetor on a flow stand, you open the carburetor to wide open throttle (WOT) and adjust the vacuum pump for 2"hg or any other amount you want. When I worked at Zenith Carburetor in Detroit we used 2"hg as the standard. Then when at WOT at 2"hg, the air flow going through the carb was measured (CFM). The higher the depression, the higher the air flow. Holley measures two barrel carbs at 3"hg depression and four barrel carbs at 1 1/2 or 2" depression. That is why they say a two barrel Holley carb with the same size venturi's and throttle bores flows more air than a four barrel carb (just two of the barrels) with the same size venturi's and throttle bores. To me this just makes things confusing and comparing apples to oranges sometimes. Sal |
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06-05-2019, 02:08 PM | #27 | |
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Re: Stromberg BIG 97
Quote:
Wondering if you could provide more details about valve train work you did? I'm starting to think two "regular" 97's won't be enough on my 296. Thanks, |
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06-05-2019, 02:18 PM | #28 | |
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Re: Stromberg BIG 97
Quote:
2 regular 97's will work fine for mild street driving and parades. |
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06-05-2019, 02:22 PM | #29 |
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Re: Stromberg BIG 97
Haha. Yeah, I'm no where near that beast you built. 1.6" valves, full porting and relief work.
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06-05-2019, 06:30 PM | #30 |
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Re: Stromberg BIG 97
Sal, thank you for the explanation, much appreciated.
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06-06-2019, 07:21 AM | #31 |
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Re: Stromberg BIG 97
I have installed them on a 383 small block chevy after having tripower with Rochester's and they do flow a lot more than the 2g Rochester's..!! Not sure the flathead would take it??
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06-06-2019, 08:38 AM | #32 | |
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Re: Stromberg BIG 97
Quote:
I'm going to port another "spare" Eddie Meyer top and first try two Holley 2110's (on an engine dyno - want to see if the flow helps), then I'd like to try two Big 97's. Would be a fun experiment. Take care my ole' friend. D |
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06-06-2019, 08:57 AM | #33 | |
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Re: Stromberg BIG 97
Quote:
While these may be alright to use on an SBC manifold, I believe that there may be problems on standard, 3-bolt Ford manifolds. I am very partial to 2G's on a street flathead in a car with a hood. I have found that, while the Mercury manifolds have enough "meat" in them to permit them to be bored all the way down to 2GC size, most Ford manifolds won't take it. I suppose this may not be a problem with "racing" manifolds without provision for exhaust heat, but I would not want to "roll the dice" on a heated Ford manifold. Just one more thing to consider. Unless you bore the manifold to match the throttle bores on the carburetor all the way (and possibly radius the corners like I do), you will not get full benefit of the larger carburetors. |
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06-06-2019, 01:01 PM | #34 | |
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Re: Stromberg BIG 97
Quote:
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06-06-2019, 01:07 PM | #35 | |
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Re: Stromberg BIG 97
Quote:
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06-06-2019, 01:52 PM | #36 | |
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Re: Stromberg BIG 97
Quote:
i looked up the number and it wasn't a bugspray carb. pretty sure it was an oem ford unit or replacement from the 50's. the bugspray units have electric choke if I'm not mistaken. |
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06-06-2019, 03:13 PM | #37 |
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Re: Stromberg BIG 97
Does amybody have any idea what the two 2GC carbs floe. The make the small onr that bolts to the Merc intake and a larger one. I've never seen any data on them, Or forgot??
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06-06-2019, 04:12 PM | #38 |
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Re: Stromberg BIG 97
Tubman said the small base is 275 a couple posts up
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06-06-2019, 04:39 PM | #39 |
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Re: Stromberg BIG 97
Hmmm. I had what I thought was a Bug Spray on my VW and it had a manual choke. You are probably right. I was a dumb kid when I owed it. Haha.
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06-06-2019, 05:38 PM | #40 |
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Re: Stromberg BIG 97
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