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Tuning your Corvair Engine GM Videos from Kevin Wilsson
Posted by: MattNall ()
Date: May 04, 2012 12:49PM

Kevin wrote:

When I first saw the tune-up slideshow below I had a much better idea about the Corvair carb adjustments.

That pesky part throttle miss that occurred after your adjustment is from an imbalance in throttle position at partial throttle. One side is trying to go faster than the other.

The carbs need to be above idle speed when balancing.

On a Vair it is not uncommon to have a bent cross shaft that causes the imbalance.

The end of part 1 and the begining of part 2 cover carb adjustment in detail.

The other vacuum lines do not need to be plugged unless there is a defective diaphram. Vacuum in kinda like water pressure in a hose - unless there is a hole in the hose the the water doesn't leak.

Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!

Edited 1 time(s). Last edit at 04/21/2014 09:52PM by MattNall.

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Replacement Fuel level Sender Float?
Posted by: MattNall ()
Date: May 12, 2012 08:48PM

Re: WTB: gas tank sending unit float
Posted by: Ed Dowds (
Date: April 20, 2012 12:11PM

The Ford Part number for the sender float that fits the Corvair is C0AZ-9202-B
C O A Z- 92 zero 2 - B

As close as your local Ford dealer!

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65 and earlier Back-Up switch repair?
Posted by: MattNall ()
Date: May 27, 2012 03:06PM

Back-up light switch again....Repair..
Posted by: vaporloc (
Date: November 25, 2009 06:55PM

The back up lights quit on my 65 Corsa vert.. After checking it out, it was the switch that was not working.. Of course I bought a new one from clarks and I don't have to tell ya they are pretty pricey.. Thinking now I have nothing to lose I'd check out the old one.. Noticed it had a mica looking insulator with two wires coming out and seemed to be held in by three crimps around the metal.. I GENTLY put it into the vise and easily bent the crimps outwards with a small screw driver.. The insulator came out.. Noticed it had two brass contact that were corroded.. Looked like those in a tail/brake light socket..Cleaned those on the wire wheel.. Next I pushed the plunger out.. It has a brass cylinder,a cardboard cylinder, springs, and a shaft with an O-ring on it..I seen that the plunger that makes contact with the two prongs was also corroded.. I cleaned it with my dremel and a wire wheel..Put on a new o-ring, A little oil on the O-ring and some silicone dielectic grease on the contacts in the mica- insulator.. Put it all back together... Re-crimped it in three different spots.. Tested it and it works like new.. I wish I'd tried that before I spent the $70 bucks plus shipping.. So I think if I can do it, so can you.. Fix that swicth and buy something else you need with the money..

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Test post to show how to attach pictures (GREAT IDEA?)
Posted by: MrChips ()
Date: June 12, 2012 02:52PM

This should be helpful for folks wanting to learn how to post pictures.

See pictures/screenshots at bottom if you get lost - they are in sequence.

(search terms)
how to post pictures
how to post photos
hoe to post images
including pictures
including photos
including images
attaching pictures
attaching photos
attaching images


Select 'Attach a file' - see the orange line? It's normally blue, but turns orange when you hover above it.


Use the 'Browse' button to open the 'File Upload' window, where you can choose your file. Choose 'open' in the 'File Upload' window once you have selected your file.

Note1: Must be under 200Kb, or phorum will reject your photo.
Note2: You can adjust your viewing preference in the 'File Upload' window just like windows explorer to display names, only, details, icons, or thumbnails(my preference)


Use the 'Attach' button next to browse to attach it.
Your picture is now attached, and will be listed under 'Attachments'


Use 'Post message' to finish your post, and be re-directed to it in the forum with your photo included at the bottom.

Note: You have a few minutes to 'edit' your post if something went wrong



Where Santiago and Live Oak Canyon intersect in Orange County, Ca

Edited 2 time(s). Last edit at 06/12/2012 02:57PM by MrChips.


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Setting YH Choke
Posted by: MattNall ()
Date: June 16, 2012 08:08PM

Posted by: Paul Kehler
Date: June 16, 2012 08:06PM

The turbo accel. pump does not work until the engine pumping does not help. The choke setting is critical as is the fast idle setting. To set the choke,take the air filter off and rotate the black thermostat counterclock wise until the choke valve just closes...this has to be done cold and with the throttle slightly open to clear the fast idle cam. To set the fast idle speed,bend the rod that goes to the throttle crank .....shorter for slower speed...longer for higher speed. To start a turbo,push on the accel pedal to set the fast idle cam and close the choke not hold your foot down on the accel.pedal. On hot starts,hold the pedal half down to open the throttle.

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Make your own U- Tube Manometer to balance your carbs AIRFLOW!
Posted by: MattNall ()
Date: June 17, 2012 01:09PM

Homemade Manometer!
1 Buy 6-10 ft. of 1/8" vinyl tubing [ walmart FISH area].

2 Add a liquid [ mouthwash / ATF ] to the tube to fill a 18" section when the hose ends are held HIGH

3 Tie this to your rear engine lid..leave ends loose at this time

The tubing connects to the choke pulloff ports [ horizontal ports].....then the tubing has to RISE to make an "M"...the liquid settling in the bottom of the "U" in the middle of the "M"

The liquid will equalize and both ends of fluid will end up at the same level....

Make MARKS where this is...

START ENGINE and get hot!

Shut off

Remove Choke pulloff hoses and attach tubing ends...

Disconnect drivers side linkage...

Start the engine and let it idle...

If both carbs are open exactly the same [ balanced ] the Liquid will not move.....if not it will RISE on the side going to the car that is further open...

adjust idle speed screw until you get the speed you want with the BALANCE!

Then without moving anything on the carbs....adjust turnbuckle to allow the drivers side link to SLIP in to hole....add clip...and proceed

Slowly rev the engine in approx. 500 rpm the fluid....

if the linkage is variation..... OK

if slightly sloppy....adjust drivers side link to keep them even as you increase RPMS....

Drivers side PUSHES down on carb it the drivers side is slow on the rise....lengthen it

If the pass. side slow coming up....shorten it!

ALSO SEE: Step by Step...Balancing the Carbs!

Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!

Edited 2 time(s). Last edit at 03/13/2019 10:19PM by MattNall.

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Best Airtex fuelpumps as of 7/2012
Posted by: MattNall ()
Date: July 04, 2012 12:21PM

Best Electric Airtex E8016S

NOTE: on any fuelpump...look for threads in the rubbers!! No Threads = BAD!

Edited 3 time(s). Last edit at 10/08/2012 06:37PM by MattNall.

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Re: FAQ'S!!! / Part Number Interchange list and All Other Frequently Asked Questions
Posted by: MattNall ()
Date: July 10, 2012 03:50PM

1968 Body And Chassis Electrical [ pdf]

Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!

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EM Generator Voltage regulators info!
Posted by: MattNall ()
Date: July 10, 2012 05:28PM

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How to Re-upholster bench seat bottoms.
Posted by: MattNall ()
Date: July 18, 2012 10:50PM

How to Re-upholster bench seat bottoms

Edited 1 time(s). Last edit at 07/29/2012 07:10PM by MattNall.

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Wheel / Tire simulator for TEST Fits!
Posted by: MattNall ()
Date: July 29, 2012 07:31PM


Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!

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Where can I buy CORSA's Technical Guides & Corvair Basics?
Posted by: MattNall ()
Date: August 04, 2012 06:33PM

Vol 1 & 2: []

Vol 3: []

Corvair Basics []

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thumbs upRules of the Corvair Center
Posted by: VairKing ()
Date: September 29, 2012 05:06PM

Rule #1: Use common sense (This is a family forum)

Rule #2: No politics. None. Zero.

Rule #3: Have Fun! This is a hobby after all!

These rules are not up for discussion and must be followed at all times or the thread may be closed, edited, or deleted at the moderator's discretion.

Ryan Counterman (Moderator)
1965 Corsa Kelmark V8 400 HP ///1965 Monza Sedan 110/PG /// Ultimate Corvair Hauler/// Don Eichstaedt's 1965 Corsa Racecar
West Michigan Corvair Club /// 1966 Corsa GTP Convertible Mid Engine 3.8L Supercharged project stalled

Edited 1 time(s). Last edit at 10/02/2012 09:58PM by MattNall.

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