Category Archives: Tech articles

Technical articles – stuff you might like to know – not always Stromberg related!

HOP UP with Stromberg !!

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Free with subscriber issues of HOP UP magazine Volume 14, Number 2. Your ‘HOP UP with STROMBERG’ water slide decal. It’s not a sticker, of course, so make yourself comfortable and watch along with Stromberg graphic design guru Jason Krzmarzick as he teaches us all the lost art of applying a water slide decal. It looks great on just a plain piece of glass. Imagine how crazy it will be snuck up in corner of the back window in your hopped up hot rod coupe?

After you’ve watched it, you might enjoy another Stromberg video from the wide range we have saved on the Vimeo website. Might be the best boxed set you’ve ever binged on…..

Didn’t subscribe to HOP UP? DIdn’t get your decal? Feel you’re missing out? You better email us at sales@stromberg-97.com and ask how you can get your own water slide… We’re still working that one out…

Stromberg BIG97 dyno thrash

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Norm Schenck at Competition Fuel Systems has been dyno testing Stromberg 97 and BIG97 carburetors for us for year. In fact he had a major hand in developing the BIG97 from scratch.

We set up a dedicated dyno motor at Norm’s facility in Vassar, Michigan and we’ve been watching intently as horsepower has grown with small tweaks to the carburetion and heads. This set up is with the cast iron vortec heads, that Norm ported himself. We have a set of AFR CNC ported heads waiting in the wings and they would probably make more power, but Norm suspects that the limitations of the Edelbrock tri-power intake would not have allowed for much more flow than was achieved with the vortec heads.

Want to know the numbers? This is a GM 330 horse crate motor and the best we got this time (by taking off the mufflers) was 404 ft-lbs of torque at 4300rpm and 386HP at 5400rpm. We still made over 400/380 with the mufflers on. This was on 89 octane gas with top end A/F ratios all in the 13s ! The dyno can now read separate A/F ratios per cylinder.

What this motor will do once someone (ie us) develops a new intake for the BIG97s is anyone’s guess. But it will be impressive, you can be sure of that…

Multiple Stromberg 97s on a Hemi!

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Stromberg 97 4x2

Four 97s on a Hemi!

Multiple 97s on your hot rod motor? Sounds good, doesn’t it? Check out this great Stromberg feature on the HOT ROD website! Written by Barry Kluczyk, we follow Bill Jagenow, at Detroit-area Brothers Custom Automotive, as he installs and tunes four new Genuine 97s on a DeSoto 291 Hemi under the hood of a 1940 Ford.

Jetting 

As Bill says, “It’s very easy to overdo it with a multi-carb setup. The 291 Hemi is not a large-displacement engine for four carburetors, so we’re backing off the fuel supply a little. We’ll start with the ‘41s’ and see how it goes after the engine is running again. We’ll check the plugs and make adjustments as necessary, but experience suggests they’ll be the right jets.” Just one thing. Bill recommends fuel pressure at 3.5psi. We prefer 2.5psi.

According to HOT ROD, “With the air horns back in place, the soldier-like formation of the quartet of Stromberg 97s looks strong. Because there are so many connections on a multi-carb setup, it’s important to check for fuel leaks and the tightness of carb mounts after the first few drives, but with the synced carbs all performing strongly, the driving experience of the Hemified 1940 has never been more fun or responsive.

Big thanks to Barry and Bill, of course. If you want to speak to Bill about Stromberg for your own hot rod, you can contact Brothers Custom on (248) 760-0700 or email at billjagsix@yahoo.com

Click here to read the whole feature.

BIG97 hits over 300cfm flow!

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We have been testing our BIG97 carbs recently to see how much cfm we can get out of a modified carburetor, with our consultant Norm Schenck at Competition Fuel Systems in Michigan. The vertical manometer shows the vacuum pulling air through the carb – 20.4″ H2O, which is 1.5″Hg. The handle on the front of the flowbench, below the carb, is set on the 400cfm scale. The inclined manometer shows the volume of air going through the carb as a percentage of that 400cfm scale. In this case, 77% of 400 is 308 cfm. There is a probe inside the 5″ cylinder below the carb, with a small correction factor that makes the airflow correct in term of the Superflow flow calibration plate. Applying that correction factor brings the flow to 300.5 cfm, though what looks like a regular Stromberg 97!!

If you’re planning a big engine build and want some serious cfm capability, contact Norm at Competition Fuel Systems – email norm@compfuelsystems.com

BIG97 Tri-Power Installation video

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Want to know more about BIG97 Tri-Power installation? Watch Bob ‘Bleed’ Merkt modify his Chevy intake manifold and install the carburetors, linkage and fuel line on his 1932 Ford Panel. The Stromberg BIG97 Tri-Power base castings may have the same external dimensions as a regular 97, but on the inside you’ll find bigger, offset throttle bores with flared exit cones to increase airflow capability and improve air pressure recovery. The intake manifold modifications recommended here (click this link for a print-out) enhance that effect, adding even more potential to your BIG97 Tri-power.  Another great video, awesomely directed and filmed by Piero DeLuca.