The Ford Barn

HopRod · 06-27-2022, 07:27 PM

Trying to get my new tri-power set up running and pulled the tops off to have a look. Who can see an issue with one of the secondary carbs? This is a Big97 Primary/Secondary setup.

Ken/Alabama · 06-27-2022, 07:35 PM

The rear carb is missing some parts. On my tri power setup , it runs on the center carburetor and the end carbs come in just past half throttle. The idle screws are all way in on the end carbs. You must have tight fitting throttle shafts and butterflies that seal on the end carbs.

uncle max · 06-27-2022, 08:44 PM

Idle jets are missing on the rear secondary.

bleo0 · 06-27-2022, 08:56 PM

Quote:

Originally Posted by HopRod

Trying to get my new tri-power set up running and pulled the tops off to have a look. Who can see an issue with one of the secondary carbs? This is a Big97 Primary/Secondary setup.

Hello buddy

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petehoovie · 06-27-2022, 09:26 PM

Quote:

Originally Posted by HopRod

Trying to get my new tri-power set up running and pulled the tops off to have a look. Who can see an issue with one of the secondary carbs? This is a Big97 Primary/Secondary setup.

nickthebandit · 06-28-2022, 04:21 AM

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There doesn't appear to be any "J" tubes on the rear carburetor either. What is the brass fitting in front of the accelerator pump hole in the middle carburetor? The 3 carburetors appear to be of the improved idle circuit type.

Charlie ny · 06-28-2022, 06:36 AM

No 'j' tubes in front carb either. Perchance are the end carbs factory setup as secondaries and the idle tubes in #3 omitted by accident.

Seems like a lot of fuel to me.
Charlie ny

deuce lover · 06-28-2022, 07:16 AM

Parts removed or were they shipped that way?

HopRod · 06-28-2022, 08:15 AM

"There doesn't appear to be any "J" tubes on the rear carburetor either. What is the brass fitting in front of the accelerator pump hole in the middle carburetor? The 3 carburetors appear to be of the improved idle circuit type."
So the internals on the BIG97s are a little different than the original 97.
There are no J tubes on the dedicated secondary carbs by design. The brass fitting in front of the accel pump hole is actually the power valve.

But, the rear carb was in fact missing the idle jets from the factory. They were never installed! Darn thing was running super rich and wouldn't respond to jet changes or mixture screw changes. I have a set of Idle Jets on order, so hopefully that will get them back in business.

Charlie ny · 06-28-2022, 08:38 AM

HR,
Please keep us posted....did #3 idle tubes cure the rich issue ?
Charlie ny

Tim Ayers · 06-28-2022, 08:49 AM

Please let us know how those Big 97's work out for you. I'm thinking of getting a pair for my 292 c.i. motor.

scicala · 06-28-2022, 05:04 PM

It appears the power valve is missing too, unless secondary big 97's have the power valves blocked ?

Sal

HopRod · 06-29-2022, 06:59 AM

Quote:

Originally Posted by Charlie ny

HR,
Please keep us posted....did #3 idle tubes cure the rich issue ?
Charlie ny

I sent a message to Stromberg and Clive got back to me. He is sending me a pair to install. I'll let you know how it runs after I get them in.

HopRod · 06-29-2022, 07:00 AM

Quote:

Originally Posted by scicala

It appears the power valve is missing too, unless secondary big 97's have the power valves blocked ?

Sal

Big97 Secondary's do not have a PV or accelerator pump system.

scicala · 07-01-2022, 09:41 AM

Quote:

Originally Posted by HopRod

Big97 Secondary's do not have a PV or accelerator pump system.

No accelerator pump. That sure seems odd.

Sal

HopRod · 07-28-2022, 09:04 AM

Update:7/27/22
After waiting for the idle jets to arrive and getting Covid, I finally got them installed and tested operation. That did help quite a bit but had to jet down from factory 56 jet to 046 on the primary carb to get the AFR back to a reasonable level.

Bored&Stroked · 07-28-2022, 09:46 AM

How would you rate the performance of them? Had you ran three "regular" 97's on that specific engine before? I'd love a comparison to be done . . .

Bored&Stroked · 07-28-2022, 09:50 AM

Quote:

Originally Posted by scicala

No accelerator pump. That sure seems odd.

Sal

Yeah, because depending on the specifics of the engine - it may or may not need the extra "shot" of fuel. I would have left them in - as all one would have to do to "disable" them is not put the little pushrod in.

Same goes for the power-valve in the accel pump well . . . no way to know if the engine needed the fuel or not, so why assume that it doesn't. Though, it is a mechanical power-valve, so without the accelerator pump pushing down on it, it wouldn't do anything anyway.

Heck, one might not need the "squirt", but may need the additional enrichment of the PV under load - so you could just remove the leather from the accelerator pump (kills the accel pump but leaves the PV intact).

Me, I'd run three of the middle carbs - and then tune to the engine.

HopRod · 07-28-2022, 02:28 PM

So the new Stromberg BIG97 secondary carbs are purposely designed this way. No power valves or accelerator pumps. You have to run them in a progressive linkage configuration and operate similar in theory to the original OEM tri-power setups of the muscle car era. You run off the primary carb and kick in the secondary's once the engine RPM and velocities are up. So far, I really like them. I haven't had regular 97 on this engine before, but have ad regular ones on another one, but they were set up for methanol.

06-28-2022, 04:21 AM	#6
nickthebandit Senior Member Join Date: May 2010 Location: Shippensburg, pa. Posts: 416	Re: Stromberg 97, what's missing? Sponsored Links (Register now to hide all advertisements) There doesn't appear to be any "J" tubes on the rear carburetor either. What is the brass fitting in front of the accelerator pump hole in the middle carburetor? The 3 carburetors appear to be of the improved idle circuit type.

06-28-2022, 06:36 AM	#7
Charlie ny BANNED Join Date: May 2010 Posts: 3,019	Re: Stromberg 97, what's missing? No 'j' tubes in front carb either. Perchance are the end carbs factory setup as secondaries and the idle tubes in #3 omitted by accident. Seems like a lot of fuel to me. Charlie ny

06-28-2022, 07:16 AM	#8
deuce lover Senior Member Join Date: May 2010 Location: Southern France Posts: 5,306	Re: Stromberg 97, what's missing? Parts removed or were they shipped that way?

06-28-2022, 08:15 AM	#9
HopRod Member Join Date: Sep 2016 Location: Raleigh, NC Posts: 40	Re: Stromberg 97, what's missing? "There doesn't appear to be any "J" tubes on the rear carburetor either. What is the brass fitting in front of the accelerator pump hole in the middle carburetor? The 3 carburetors appear to be of the improved idle circuit type." So the internals on the BIG97s are a little different than the original 97. There are no J tubes on the dedicated secondary carbs by design. The brass fitting in front of the accel pump hole is actually the power valve. But, the rear carb was in fact missing the idle jets from the factory. They were never installed! Darn thing was running super rich and wouldn't respond to jet changes or mixture screw changes. I have a set of Idle Jets on order, so hopefully that will get them back in business.

06-28-2022, 08:38 AM	#10
Charlie ny BANNED Join Date: May 2010 Posts: 3,019	Re: Stromberg 97, what's missing? HR, Please keep us posted....did #3 idle tubes cure the rich issue ? Charlie ny

06-27-2022, 08:44 PM	#3
uncle max Senior Member Join Date: May 2010 Location: SLC Utah Posts: 798	Re: Stromberg 97, what's missing? Idle jets are missing on the rear secondary. __________________ RIP Tyler... My Son, Helper & Best Friend. Feb '78 to Father's Day '10. www.97-express.com ~ [email protected]

06-28-2022, 08:49 AM	#11
Tim Ayers Senior Member Join Date: May 2010 Location: NJ Posts: 6,179	Re: Stromberg 97, what's missing? Please let us know how those Big 97's work out for you. I'm thinking of getting a pair for my 292 c.i. motor.

06-28-2022, 05:04 PM	#12
scicala Senior Member Join Date: Jun 2010 Location: Detroit suburb, MI Posts: 3,706	Re: Stromberg 97, what's missing? It appears the power valve is missing too, unless secondary big 97's have the power valves blocked ? Sal

07-28-2022, 09:04 AM	#16
HopRod Member Join Date: Sep 2016 Location: Raleigh, NC Posts: 40	Re: Stromberg 97, what's missing? Update:7/27/22 After waiting for the idle jets to arrive and getting Covid, I finally got them installed and tested operation. That did help quite a bit but had to jet down from factory 56 jet to 046 on the primary carb to get the AFR back to a reasonable level.

07-28-2022, 09:46 AM	#17
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,067	Re: Stromberg 97, what's missing? How would you rate the performance of them? Had you ran three "regular" 97's on that specific engine before? I'd love a comparison to be done . . .

07-28-2022, 02:28 PM	#19
HopRod Member Join Date: Sep 2016 Location: Raleigh, NC Posts: 40	Re: Stromberg 97, what's missing? So the new Stromberg BIG97 secondary carbs are purposely designed this way. No power valves or accelerator pumps. You have to run them in a progressive linkage configuration and operate similar in theory to the original OEM tri-power setups of the muscle car era. You run off the primary carb and kick in the secondary's once the engine RPM and velocities are up. So far, I really like them. I haven't had regular 97 on this engine before, but have ad regular ones on another one, but they were set up for methanol.