Venturi

Linkert related issues
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white1j0
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Venturi

#1

Post by white1j0 » Wed Dec 04, 2013 6:08 pm

Anyone know the best way to remove the venture from a Linkert, I just bought it on ebay and the venture is in backwards, Thanks Whitey



james
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Re: Venturi

#2

Post by james » Wed Dec 04, 2013 8:12 pm

Well I do know the first thing you need to do is remove the bowl nut, spring then emulsion tube completely then with something soft like plastic or a wooden dowel lightly tap it out from the throttle side. I'm sure Cotten will have the best method.
Jim

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Re: Venturi

#3

Post by Cotten » Wed Dec 04, 2013 9:13 pm

Whitey!

It didn't fall apart?

Then I s'pose Jim has the jist of it, with gentle heat from a heatlamp and a lot of penentrant. Removing the main nozzle (emulsion tube) can often be the greater issue. The search function should take you to previous discussions on means of pulling it safely.

And they seem to run pretty good with the venturi in backwards, when everything else is in order. Backwards throttlediscs are not uncommon either.

...Cotten

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Re: Venturi

#4

Post by white1j0 » Wed Dec 04, 2013 10:50 pm

Forgot to mention it's also upside down, the main nozzle couldn't even have been installed, the venturi is blocking the hole, thanks for the info. I'm going out now to see if I can tap it out

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Re: Venturi

#5

Post by Mr.Big » Thu Dec 05, 2013 2:00 am

Clean the bore with some Scotchbrite, get a 1" or 1-1/8" (depending on what size carb it is) socket and extension, hose it down with PB or Kroil and gently tap it with a wubba hammer and see if it moves, if not keep hosing and keep tapping. It will come out......

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Re: Venturi

#6

Post by Cotten » Fri Dec 06, 2013 12:29 am

You never know what you'll find, Folks:
VENTTORT.jpg
or even;
VENTMELT.jpg
But still, those that seem resonably serviceable after moderate ease of removal, invariably deserve more attention.

...Cotten
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Re: Venturi

#7

Post by white1j0 » Sun Dec 08, 2013 6:12 pm

Removed it with a 1 9/16" piece of Delron I turned, it tapped out fairly easy, I cleaned it and it slid in pretty easy, was wondering what keeps it from shifting around other then the main nozzle ???

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Re: Venturi

#8

Post by RUBONE » Sun Dec 08, 2013 6:55 pm

Ideally they are a light press fit and fully seal against the carb body. They can be GENTLY swaged to fit snugly. It has been covered here extensively and Cotten has shown pics of his techniques. All is in the Knowledge base and available for review.

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Re: Venturi

#9

Post by Cotten » Sun Dec 08, 2013 8:57 pm

White1j0!

Its mostly about daylight around the outside, after you thorougly clean both venturi and bore.
DAYLIGHT.jpg
You hope it doesn't rattle upon the nozzle spigot of course. Just like the airleak around the outside, any wear at that point defeats the 'accelerator sump' action of the nozzle.

Even when I swage potmetal venturies far oversize, and then cut to a light press fit, it may only be a matter of a few months that it has returned to a slip-fit, however they retain their round-ness, and 'daylight' is still scarce.

You want the throttledisc to close just as sweetly, with the idle screw relieved.

And actually, I haven't posted much about my swageing methods at all.
If you don't have a lathe, please don't try.

....Cotten
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Re: Venturi

#10

Post by james » Sun Dec 08, 2013 11:04 pm

Cotton, did you ever think of cutting, on the lathe, a small recess in the heftier portion of the venturi and installing a thin "O" ring?
For fit and sealing properties.

Jim

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Re: Venturi

#11

Post by Cotten » Sun Dec 08, 2013 11:56 pm

Jim!

I did for a minute.

Too many un-necessary machine set-ups, all beyond the initial swage-and-recut.
Please note that the critical region for seal is to the rear, where it is not hefty, but quite thin.

A leak at the front would only add to the main nozzle draw, if at all required.

And why add food for P4gas to digest?
Even if a uniquely-thin viton is available, its in bulk.
Where would my customers find one a decade from now?

Keeping to the original design as close as possible keeps it simple.

...Cotten

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Re: Venturi

#12

Post by john HD » Mon Dec 09, 2013 12:15 am

cotten,

if you ever decided to experiment harbor freight has viton in a 180 pc assortment for 11 bucks. http://www.harborfreight.com/180-piece- ... 67525.html" onclick="window.open(this.href);return false;

i have a couple from this kit installed in petcocks to see if they hold up. i think the kit goes big enough to cover some manifold applications as well.

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Re: Venturi

#13

Post by Cotten » Mon Dec 09, 2013 2:08 am

John!

A kit is on my Christmas list, but not for sealing venturies.

Not enough meat to seat it in, no reason to go to extra machine steps beyond what already works, and no reason to add variables for the future.

Simplicity is what made these carbs miraculous.

....Cotten

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