I am about to install 4 97's on my Olds and read yesterday a small article that stated there were two different bases offered in the diamond or arrow units. Looking at mine I have found that I have two of each which I am going to change to four with the additional brass nozzels right above the butterfly so I will have identical carbs in the hope that it helps with the fine tuning. What was the purpose behind this change? Benefit? I have never seen the same in the D base carbs. Makes me curious as to the reason for the tubes. Hoping someone might know more about this.
Oh boy, now I've got to dig out my six Strombergs and see how they compare.... I hope the consensus is that it doesn't matter.
You really need to get rid of the steel screws. You can buy the brass screws from Carr McMasters. Put them in and use a center punch to expand the ends.
I had Stromberg 48’s on my coupe. I think the difference in the series was a vacuum pull off. I could be wildly wrong. @uncle max , your knowledge is needed
That is on the list as we move forward. 155 views and no one knows why the brass tubes were added but not used on the D bases. Maybe @carbking has the answer or some input.
I'm still learning, but it might be the signal feed for ported vacuum. Is there a vacuum port on the outside of the base about the same height above the throttle plates? Near one of the mixture screws.
I have never seen an EE1 base with a vacuum port although one does exist I am told. Here is a copy of a vacuum base offered over on the Barn from a Buick that is stated to work on the 97: For sale is a Stromberg EE-1 base casting assembly that came off a '34-'35 Buick carb. Now, before you scroll back, this base WILL FIT ON 97 and 48 carbs, and will give you a TIMED VACUUM PORT that the 97 and 48 bases don't have. This is important if you plan to run a Chevy or other conversion distributor on your flatty, as the manifold vacuum won't give your distributor the correct signals.
Walt ,since you did not ask me about the nozzles, here is the info. The later Stromberg 97 EE 1 carburetors came with an improved idle circuit. since you have 2 of the bases without the nozzles. I am interested in getting them from you.
The upper squirters actually improve off-idle response in a SINGLE carb application. Things get ugly if you're using more than one carb.
Sometimes a simple question ends up with a less-than-simple answer. I have posted before that Stromberg made several different type EE-1 carburetors for Ford. Before making this post, I ran an inquiry into my Stromberg database. Stromberg tested 61 different versions of the EE-1 for Ford alone! OK, not all of these made production status, but several different WERE produced. The EE-1 carbs that were stamped "97" did not come with the later bases. The last O.E. use by Ford of the EE-1 was the 1938 model year. The sea level to 5000 feet version was number A-18271. The revised throttle bodies were introduced with Stromberg EE-1 carburetor number 380076 on April 1st, 1941 (no, Virginia, this is NOT a bad April Fool's joke, some folks actually work(ed) on 1 April). This was an aftermarket carburetor which was meant to replace A-18271 entirely, not piecemeal. Stromberg continued to make service parts for A-18271 but the service throttle body assembly did NOT have the revised idle circuit. Not yet posted in this thread is the fact that not only the throttle body changed, but also the 1941 carburetor had a revised idle circuit in the main body. And Stromberg revised the revised throttle body again in 1947, but I don't have that print digitized, and the original drawings are now in storage. The drawing is on a 500 foot microfilm roll, but I am too lazy to search it now. Thus Stromberg offered a service throttle body (similar to the original) for the A-18271 (marked "97") AND a service throttle body for the 380076 (NOT marked "97"). Can they be interchanged? I do not know, but probably, IF one updates the main body on the A-18271 to 380076 specifications. Those of you planning to run multiples will find that if EVERYTHING matches, better results will be acquired. My apologies for being verbose, but thought some of you might like this information. Jon
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