Technical Stupid questions and those who ask them (p.s. it's me)

I've been posting about my battle with my 3x2 Stromberg 97 set up. As someone new to this hobby, I truly appreciate the help. It's been quite the adventure.

On to my next brain twister: how do I disengage the front and back carbs so I can dial in and run just the middle carb for now?

Thanks again guys

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Was suggested to take them off and capping those two areas of the intake. If it was mine, I would screw any air adjusters in until they lightly bottom. Do this on the front and back carb only. Then I would disconnect the multiple linkage so only the center carb throttle linkage. Then I would back the air/idle screws on the center carburetor two full turns from light seating. Having a dwell tach and vacuum gauge connected under the hood are HIGHLY desirable but not absolutely required. A timing light is a bonus. It is important that you verify the fuel pressure the 97's want is what you have your fuel regulator adjusted to. Start the car and warm it up. Adjust the idle mix screws if needed to what is needed. The motor will tell you when it is happy. Good luck and keep us posted.

 

desertrat , right on .............

 

Thanks for the info! I have the fuel reg. Set right at 2.5. I do have a timing light, set timing the other day. For now I really just want to take my daughter out cruising while the weather is so nice. Will worry about the other 2 carbs later. Thanks again.

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On my setup, I blocked off the two end carbs and got the center one running good before dealing with the others. If you have a vacuum leak on one of the end carbs butterflies then you won't be able to get the center one running right.

 

I don't know if your engine has a rubber mounted damper that might have moved the timing mark if it slipped, but I always try bumping the timing by ear on lots of older engines that aren't quite right with the light; (rather than assume the mark has not moved)
.

 

Got it, will look tonight, appreciate the suggestion

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I don't know. I never had a tripower, but wouldn't a couple block-off plates under outer the carbs and a quick rearrangement of the fuel line to center only work?

 

I'll look at blocking plates as a last resort, I'm hoping this is very temporary

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I just don't see how you will be able to adjust the center carb properly with all the air coming in the two outside carbs. A carb will draw air with the throttle blades closed. With block plates you could leave the throttle linkage all hooked up. Probably a 15 minute job to make and install a couple plates.

 

That makes sense, dont want to mess with linkage if not necessary, what would i make the blicks out of? And do they just go in betweer the manifold and carb base?

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No, you cant leave linkage hooked up with the block-offs in place. Your outer carb butterflies will bottom out.

 

You are correct. Didn't think about that. Thank you.

Block off plates can be made from a very light sheet metal.

 

There are no stupid questions if you're trying to learn, we're glad to teach. Stupid questions come from time wasters.

 

Block off plates between carb base and manifold, use progressive linkage like oem Pontiac 3 deuce and you can adjust where they never come into play but still have linkage connected.

 

Here is a pic, notice linkage from middle to end carb, see how it's slotted? It screws in and out to let you adjust when they come in. If the threads are the same all you would need to do is change the one end of your linkage from your middle to end carb.

 

Now that makes more sense to me, thanks

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The butterflies won't bottom out on 97's. I'm only running the center carb on my Olds right now so I could get it on the road this summer. I made 20 gauge sheet metal block off plates directly under the carbs with the gaskets in place. I also brazed a couple of my fuel inlets closed because I wanted the look but that is not necessary.

 

I like the look of your fuel , my black rubber hose drives me nuts

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*fuel lines

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I do to but I will say the only reason they are on there is because that's how the car was built in 1963 and I want it to remain as it was originally set up. Hard lines are a much safer option in my (and most others) opinion.

I have a whole new roll of the blue line that is suppose to be compatible with today's crummy fuel. I keep a very close eye on this stuff (and a fire extinguisher on board) for signs of deterioration.

 

Yeah, i need to pick up a fire extinguisher, i think i could plumb in hard line without too much trouble

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I would just take off the linkage you have from the outer carbs,run the fuel line just to the center carb and block off the outer carb bases. As has been said, use a plate between the carb and the manifold /carb base gasket. Thin aluminum sheet, trace around a base gasket to get the shape on the aluminum, cut to shape and drill the mounting holes.

 

Thanks, that's my project for the long weekend

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Just wondering, anyone see any problem with just making a temp block off like he wants to do out of sheet gasket material instead of cutting plates?

 

I was wondering if i could use rubber for block off plates

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You could use wood. It'll be fine

 

You could probably cut them out of a beer can with a pair of scissors!

 

What better excuse to have a couple beers!

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