Speaking of Precision Blog

Speaking of Precision

Speaking of Precision is a knowledge preservation and thought leadership blog covering the precision machining industry, its materials and services. With over 36 years of hands on experience in steelmaking, manufacturing, quality, and management, Miles Free (Milo) Director of Industry Research and Technology at PMPA helps answer "How?" "With what?" and occasionally "Really?"

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Are You Making Carburetor Parts?

Posted June 28, 2011 8:00 AM by Milo

Back in the day, we had one coil to bar machine working a couple of weeks each month making carburetor shaft stock to sell to screw machine shops like yours - and so did most of our competitors.

Carburetors were the way we metered gas/air mixture back in the...Oh never mind.

And another running a few days a month making the hex steel for the fuel line nut that attached the fuel line to the carburetor.

With the advent of the computer chip, it seems like a lot of screw machine products disappeared, like parts for mechanical calculators, adding machines and cash registers.

With the upgrading of automotive technology, it seems that a lot of those fuel system parts also went "Bye-Bye"- throttle and butterfly shafts, linkage parts, and fuel nuts come to my mind. Goodbye carburetors, hello fuel injection. Hello anti-lock brakes. Hello airbag parts…

The claims of these changes killing the machined parts industry have been proven to be wrong. We're making higher precision, higher complexity components to make up for those lost parts.

But when my son and I visited a local street rod show over the weekend, I saw a lot of nice looking carburetion systems under a lot of very nice hoods.

I remembered knowing what the tricks were to make the steel remain straight even after the flats for the choke plate were milled in to it. (Hint it had nothing to do with the straightener.)

Then I asked myself, "Who is making today's street rod, aftermarket and high performance carburetor parts?"

I sure saw a lot at the street rod show. And I know a lot of very talented machinists out there…

Is going "Back to the future" a viable way of mining your capabilities in light of today's very fragmented markets and lower volumes?

I'm thinking it is a profitable idea to consider.

Editor's Note: CR4 would like to thank Milo for sharing this blog entry, which originally appeared here.

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#1

Re: Are You Making Carburetor Parts?

06/28/2011 3:53 PM

I have made a lot of replacement parts for old carbs and then adjusted the carb to run well. I used to live in New Mexico where cars don't rust. Carbs have had plastic parts on them since the mid 50s. these age and need to be replaced. I made the replacements out of brass and did a fine business for quite a few years. I never had to advertise, it was all word of mouth. Once I had a particular model of carb figured out I made up a written template and also took quite a few pictures. some of the levers are/were very complex. I now live 1400 miles away and have not been asked for a part in a few years. I did not do much High performance work, just getting old cars in good shape running again. A lot were show cars that were in original condition.

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#2
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Re: Are You Making Carburetor Parts?

06/28/2011 3:59 PM

SilvCrow, I'm not sure why you marked this post OT. Seems a good contribution to the discussion.

I am going to help you out with that OT mark a little bit...

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Re: Are You Making Carburetor Parts?

06/28/2011 4:05 PM

That was as on topic as a reply could get. Thanks for sharing your experience, Silv crow.

Milo

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#4

Re: Are You Making Carburetor Parts?

06/28/2011 10:41 PM

So what is the trick now that you mention it?

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Re: Are You Making Carburetor Parts?

06/28/2011 10:45 PM

Replacement parts for obsolete vehicles is always tough. In some cases the formulas and procedures used by the OEMs have been lost. Some of my motorcycles use multi-disc clutches. The clutch plates are mild steel discs about 5" diameter and 1/32" thick stamped to the proper shape. The stamping introduces stress and the plate warps slightly as a result of these stresses. When warped plates are stacked in a clutch assembly, the clutch drags and shifting becomes difficult. The original manufacturer annealed the punched plates in a furnace between weighted flat plates. The after market manufacturers didn't do this. As a result, all after market clutch assemblies drag. This makes riding an unpleasant experience.

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#6

Re: Are You Making Carburetor Parts?

06/29/2011 1:57 PM

Hey, I too would like to know the trick !

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#7

Re: Are You Making Carburetor Parts?

06/29/2011 10:29 PM

I have not done much in regards to vehicle carburetors but I have done a few mods to make the newer non adjustable emissions type lawn and garden engine carburetors adjustable like the old ones where.

Its surprising how much power, fuel efficiency, better starting, and longer lived those small engines can be when adjusted to run efficiently not "cleanly".

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Re: Are You Making Carburetor Parts?

06/29/2011 11:25 PM

As recently as 1989 (did I say that?) I was carrying old SU carbs into my machine shop as the bearing surfaces and shafts had worn so deeply they both sucked air.

Think it ran me about $30 bucks each to have them bored out, bushed, and new shafts fitted, balanced right out afterwards.

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Aviator (1); Doorman (1); edignan (1); Milo (1); Rorschach (1); silvCrow (1); tcmtech (1); welderman (1)

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