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1966 140 carb homemade linkage mod....really pleased
Posted by: red monza ()
Date: August 25, 2016 06:32AM

I was trying to sell off some stuff to get some money to get Roger's linkage...it was going to take some time so I thought I might study and come up with a temp improvement.

Seemed everything was based on the 65 linkage and the elimination of the springs that control the secondary carbs...so, I removed the secondary rod on the driver side as it looked to be the easiest to modify.

I determined where the engagement was with the spring system and soldered a washer where it would operate closely to the orig setting that worked fair...and I do mean fair. You know, sometimes it would engage...sometime it would stick and all of sudden engage, etc. It is now adjustable as the threaded rod is still cabable of operating where it engages where you want it too...very adjustable.

After determining that this would work after fixing the driver side, I fixed the pass side.

How good does it work? It is like day and nite from the spring controlled linkage...and the good part, it works great every time not just for an hour or day like the spring controlled rod worked after adjustment...both carbs come on the same at the same time...it did take a few test runs to get it where it operates like I wanted it too. Very pleased and only took about an hour or two to fix and at NO cost other than some time.

Jimmy in NC

1966 Monza tropic turquoise 140/PG
1964 Monza yellow conv (spring for sale maybe)
Jimmy in the mountains of NC

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: davemotohead ()
Date: August 25, 2016 07:22AM

People have been removing the spring and replacing with a piece of steel fuel tubing cut to length slid over the rod for years, also you need to disable / remove your secondary lock out tabs, that is why it has a spring so the linkage will operate before the chokes open with the secondaries locked. With no spring and the lock outs still operating you will only get part throttle or break something before the chokes open fully and release the lock outs.







1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: Spectre ()
Date: August 25, 2016 07:26AM

You will want to remove the lockouts from the secondaries or you won't get full throttle until the chokes are open. I made a similar mod to a '66 I used to have that had early '65 secondaries (no lockouts), except I used a length of steel tubing in place of the springs. It worked great.

Edit: Davemotohead beat me to it.

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Norman, OK



Edited 1 time(s). Last edit at 08/25/2016 07:27AM by Spectre.

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: Brizo ()
Date: August 25, 2016 07:29AM

Red, Yes it does work well. Corvair mechanics have been making similar mods to the '66 140 linkage since the '70s. More often, a section of steel tubing of the correct length is slipped down over the rod to accomplish the same function.

Dan Brizendine, Circle City Corvairs
'64 8door Greenbrier 140 PG. "In beautiful Wanamaker Indiana...with one stop light and 5 pizza shops"

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: red monza ()
Date: August 25, 2016 09:05AM

Thank you all for the info...

I have been on this forum and searched 140 linkage a thousand times...have never seen any mod as to what I have done or any mention of sleeves...or I would have done the mod months ago.

I did have one carb lock out disabled but not the other...will do so with the other. I try and not activate the secondaries until the engine is warmed up...way to use to my two quadrajets on the 49 and vette as they will not engage the big back barrels until the engine is warm for a reason.

It really made a huge difference in the way it runs...tickled with my mod.

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: flat_six ()
Date: August 25, 2016 10:08AM

Mine has little clamps that can be adjusted up and down the rod. Curious: where are the secondary lockouts and what do they look like. How are they disabled?

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: azdave ()
Date: August 25, 2016 11:12AM

red monza Wrote:
-------------------------------------------------------
> I have been on this forum and searched 140 linkage
> a thousand times...have never seen any mod as to
> what I have done or any mention of sleeves...or I
> would have done the mod months ago.


Back when most of us first did that mod there was no such thing as the internet to post about it. grinning smiley grinning smiley grinning smiley

Dave W. / Gilbert Arizona
65 Corsa 140/4
66 Corsa 140/4
66 Corsa 140/4 w/factory A/C
66 Corsa 455 Toro V8
65 Monza Convertible 110/4
66 Monza Convertible 140/4 A/C
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5



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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: davemotohead ()
Date: August 25, 2016 11:15AM

I chiseled the mod on a rock and mailed it to everyone on the pony express!
-------------------------------------------------------
> azdave Wrote:
> --------------------------------------------------
> Back when most of us first did that mod there was
> no such thing as the internet to post about it.
> grinning smiley grinning smiley grinning smiley







1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: Seth Emerson ()
Date: August 25, 2016 11:20AM

Jimmy's first photo shows them on the top carb. The "lockout" is a shaft with a tab hanging over the primary choke linkage. When the primary choke releases, the primary choke shaft lifts that tab and that pulls the lock away from the linkage on the other side, letting the carb respond to the throttle. If working correctly, (rare, I know), it is a slick way to assure that the driver who, upon feeling a cold stumble, just gives it more throttle, doesn't stall the motor by opening all four carbs. Early 65 140s, I guess, had folks complaining. Otherwise GM would not have spent the time and money for the "fix".

Seth Emerson

Check my new Performance Corvair Web site [www.perfvair.com]

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: viewmaster ()
Date: August 25, 2016 11:31AM

red monza Wrote:
-------------------------------------------------------
> Thank you all for the info...
>
> I have been on this forum and searched 140 linkage
> a thousand times...have never seen any mod as to
> what I have done or any mention of sleeves...or I
> would have done the mod months ago.
>
> I did have one carb lock out disabled but not the
> other...will do so with the other. I try and not
> activate the secondaries until the engine is
> warmed up...way to use to my two quadrajets on the
> 49 and vette as they will not engage the big back
> barrels until the engine is warm for a reason.
>
> It really made a huge difference in the way it
> runs...tickled with my mod.



Red,

I feel you. I have searched for this and other particular stuff, and the search either comes up with nothing relevant or is so vast in its scope, that one must wade through a bazillion pages, to get what they are seeking. Or...the post is old and pics have been deleted. UGH...

Nice job tho. I am building a 140 and have the 65 linkage, with the springs. Will have to try this, or with tube fix, when i get to that point. Thanks for posting.
-m

Mike
'65 '500' Sedan 110 PG
'65 Monza Sedan turbo'd 110 SU conversion
Fresno, CA

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: flat_six ()
Date: August 25, 2016 11:35AM

Seth Emerson Wrote:
-------------------------------------------------------
> Jimmy's first photo shows them on the top carb.
> The "lockout" is a shaft with a tab hanging over
> the primary choke linkage. When the primary choke
> releases, the primary choke shaft lifts that tab
> and that pulls the lock away from the linkage on
> the other side, letting the carb respond to the
> throttle. If working correctly, (rare, I know), it
> is a slick way to assure that the driver who, upon
> feeling a cold stumble, just gives it more
> throttle, doesn't stall the motor by opening all
> four carbs. Early 65 140s, I guess, had folks
> complaining. Otherwise GM would not have spent the
> time and money for the "fix".


Thanks. So I'm guessing that the 65's did not have that feature at all.

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: red monza ()
Date: August 25, 2016 12:37PM

davemotohead Wrote:
-------------------------------------------------------
> I chiseled the mod on a rock and mailed it to
> everyone on the pony express!
> --------------------------------------------------
> -----
> > azdave Wrote:
> >
> --------------------------------------------------
>
> > Back when most of us first did that mod there
> was
> > no such thing as the internet to post about it.
>
> > grinning smiley grinning smiley grinning smiley


Well....I came over on the Mayflower and they were not at Plymouth Rock or I would have seen the fix there....lots of rocks though.

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: firevair66 ()
Date: August 25, 2016 02:21PM

I used a shaft collar with locking screw for fine adjustment.

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: red monza ()
Date: August 25, 2016 05:16PM

viewmaster Wrote:
-------------------------------------------------------
> red monza Wrote:
> --------------------------------------------------
> -----
> > Thank you all for the info...
> >
> > I have been on this forum and searched 140
> linkage
> > a thousand times...have never seen any mod as
> to
> > what I have done or any mention of sleeves...or
> I
> > would have done the mod months ago.
> >
> > I did have one carb lock out disabled but not
> the
> > other...will do so with the other. I try and
> not
> > activate the secondaries until the engine is
> > warmed up...way to use to my two quadrajets on
> the
> > 49 and vette as they will not engage the big
> back
> > barrels until the engine is warm for a reason.
> >
> > It really made a huge difference in the way it
> > runs...tickled with my mod.
>
>
>
> Red,
>
> I feel you. I have searched for this and other
> particular stuff, and the search either comes up
> with nothing relevant or is so vast in its scope,
> that one must wade through a bazillion pages, to
> get what they are seeking. Or...the post is old
> and pics have been deleted. UGH...
>
> Nice job tho. I am building a 140 and have the 65
> linkage, with the springs. Will have to try this,
> or with tube fix, when i get to that point. Thanks
> for posting.
> -m

Yes...you are welcome...I thought I had discovered Atlantis....nope...just a easy quick fix to my 66 corvair 140 linkage that everyone else has had so long that they forgot they had done it long ago...one even in the stone age.

O well...hope it does help you and if you need more info let me know by PM anytime...

Jimmy in NC...about 20 min from the highest mountain east of the Mississippi River.

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: Joe Potts ()
Date: August 25, 2016 05:39PM

You live in a place that has winter (I don't). I wonder if this mod might tickle you less if/when you park outside overnight and start up on a cold morning.

The shaft collar is sheer genius (simplicity, adjustability).

I have attained almost as much adjustability by using all-thread and pairs of nuts tightened against each other. Mine has worked very well for well over a decade.

Miami, Florida USA
1966 Corsa coupe 140hp 4-speed with "factory" A/C
solenoid-type fuel pump used for priming and backup
3-point retractable seat belts for front seats
8" subwoofer with custom infinite-baffle enclosure in well behind back seat
rear component mids/tweeters powered by outboard amp under pass seat
front mids/tweeters powered by Custom Autosound headunit

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: Seth Emerson ()
Date: August 25, 2016 11:49PM

Just remember, if you disable the spring function,(collar or tubing) you must disable the secondary lockouts. If you don't your primary carb throttles won't be able to fully open.

Seth Emerson

Check my new Performance Corvair Web site [www.perfvair.com]

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: moomba32 ()
Date: August 26, 2016 01:51AM

Following this post is the first time that I have heard of this. I've been running my 66 140 for over ten years now and didn't even know this was a problem, they seen to work fine or me with the springs, I did have a problem with one of the secondary carbs staying open after letting off the throttle, cleaning the carb fixed that.

Don Marlowe
66 Monza 2Dr 140/pg
64 Spyder convertible now, 110/pg
Eutawville SC

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: flat_six ()
Date: August 26, 2016 10:36AM

moomba32 Wrote:
-------------------------------------------------------
> Following this post is the first time that I have
> heard of this. I've been running my 66 140 for
> over ten years now and didn't even know this was a
> problem, they seen to work fine or me with the
> springs, I did have a problem with one of the
> secondary carbs staying open after letting off the
> throttle, cleaning the carb fixed that.


You must be using your 140 correctly then (opening the secondaries OFTEN)!

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: moomba32 ()
Date: August 26, 2016 10:50AM

flat_six Wrote:
-------------------------------------------------------
> moomba32 Wrote:
> --------------------------------------------------
> -----
> > Following this post is the first time that I
> have
> > heard of this. I've been running my 66 140 for
> > over ten years now and didn't even know this was
> a
> > problem, they seen to work fine or me with the
> > springs, I did have a problem with one of the
> > secondary carbs staying open after letting off
> the
> > throttle, cleaning the carb fixed that.
>
>
> You must be using your 140 correctly then (opening
> the secondaries OFTEN)!
smiling bouncing smiley
Only when I drive it somewhere.

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Re: 1966 140 carb homemade linkage mod....really pleased
Posted by: 63ConDan ()
Date: August 29, 2016 07:34PM

Very good post. thank you all.

Dan Central MN

1968 Convert

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