Marvel carb air valve spring -- which one?

[Gotfredson]

Hello!  I am trying to figure out which Marvel air valve spring will work with my carb in the attached photo.  It is currently installed on a Buda HS-6 engine (not original vehicle):
http://gotfredson.org/models/BUDA_HS-6.pdf

 

My carb is similar to this one, which is labeled a "1928 Pontiac Marvel Model A" on the Old Carb Doctor web site:
http://www.oldcarbdoctor.com/photos.html

 

Additionally, I saw a photo posted a couple years ago by CarbKing Jon (also attached).

 

 

Does anybody have one of these Marvel parts books that identifies the air valve spring by number or photo?

 

Thanks!

[Gotfredson]

Found this.  Marvel number unknown.

https://classiccarbs.com.au/index.php?_route_=Marvel-Model-H-Carburettor-Air-Valve-Spring-Type-1-has-many-applications-inc-Buick-1922-25-900.M001-

[Hans1]

my marvel book on overhauling marvel carb

all springs are 1 1/2 inch long, except Essex 30, 31 and 32  and Pontiac sis30, 31, and 32 which use springs 1 1/16

28 Pontiac  uses spring 24-115 which appears to be used by many cars.

Now to determine spring number 24-115 and different shapes on picture  

Buick Master 6  for 25 uses air spring 24-115, so they may have the spring you need

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I may have some parts carbs if you need some.

Hans

Click to enlarge

Price: $15.00 Availability: In Stock Model: 900.M001 Manufacturer: Classic Carburettors Average Rating: Not Rated   Qty:

[Hans1]

My Marvel book on overhauling marvel carb

all springs are 1 1/2 inch long, except Essex 30, 31 and 32  and Pontiac sis30, 31, and 32 which use springs 1 1/16

28 Pontiac  uses spring 24-115 which appears to be used by many cars.

Now to determine spring number 24-115 and different shapes on picture  

////////////

Buick '25  Master 6 uses air spring 24-115 so they may have the spring for you.

I may have some marvel carbs like yours is you need parts.

Click to enlarge

Price: $15.00 Availability: In Stock Model: 900.M001 Manufacturer: Classic Carburettors Average Rating: Not Rated   Qty:

 

 

 

[Hubert_25-25]

Looking for the correct Marvel air valve spring for a 1925 Buick Standard.  These are the part numbers and springs for the various carburetors.  

Of course mine is the 1 year only, and only for Buick Standards. 
 

Part number    application

24-215      1925 Buick Standard

24-115      1924-6, 1925 Buick Master, 1926-1927-1928-1929 All models

24-114      1930 Series 50-60

24-315      1930 Series 40, 1931 ser 50-60, 1932 ser 60  

24-214      1931 Series 80-90, 1932 ser 80

24-316      1932 ser 50,

 

I know the 24-215 and 24-115 are both 1 1/2" long.   Springs 5 and 6 in the opening posting with yellow background both look to be 1 1/2" long springs, but they are definitely wound differently.   

The spring I have is 5 loose wraps, 7 tight wraps, 5 loose wraps.  The one in the photo above from Classics looks to be 4 loose wraps, 9 tight wraps, 4 loose wraps.  I did include a cutting from their ad that has more detailed specifications.  

 

On the internet I found this one correct OEM 24-215 with a little wooden box that had already been sold, but it does look like mine.   

 

How can you tell the difference between these springs?  I do need a spring (for a spare carburetor) but do not know how to locate the correct one.

Hugh

[carbking]

From memory, there are maybe 15 different.

 

In a different lifetime, we had all of them reproduced, because a rebuilding kit without the spring is (opinion) not a rebuilding kit.

 

We do not sell the springs ala carte, only as a part of the rebuilding kit.

 

I do not, from memory, know which length fits what, so will agree tentatively with Hans1 about the applications that use the 1 1/2 and 1 1/16 inch springs.

 

When we originally offered the rebuilding kits, I was younger, and more foolish and had maybe just watched "Field of Dreams"

 

It costs MONEY to reproduce parts which often fit only 1 carburetor. Again from memory, there are approximately 125 different O.E. Marvel carbs, for which we offer 61 different kits.

 

Jon

Quote

 

 

 

Edited November 16, 2021 by carbking (see edit history)

[Hans1]

I am not an authority on Marvel carbs.  I have a number of them and some books on them.

 

Things I have noticed are: smaller single barrel carbs seem to use springs with  easier compressability  to dampen the air valve movement.

 

While the two barrel "Buick" carbs seem to have springs with more resistance to movement. 

They have two air valves, more weight to dampen.

////////////////////////////

 

The common rule seems to be that the large brass knob is to be initally by positioned so the end of the ratchet arm is at the end of it.

But with old springs in my carbs and the possible changes in compressibility after years, I re adjust the operation of the cars driveability by moving the brass knob.  This is also part of the manual of operation.

 

////////////////////////////

I would try to obtain various springs from single barrel Marvel carbs and expirement.

 

Best wishes in your  search.

[Hubert_25-25]

If anyone has a 24-215 spring, I would be willing to make a purchase or trade for a 24-115 spring.   Specifications are below.   Hugh 

Edited November 21, 2021 by Hubert_25-25 (see edit history)

[Hubert_25-25]

This is my latest data on Marvel Carburetor springs.  I learned more than I expected.  It would be nice to know the spring data for all the Marvel carburetors in case one of our Buick buddies needs a spring, we will be able to tell them what they need.    Hugh

 

[31nash880]

Looks like the right group of people to ask. Have a 1931 Nash 880 with straight 8 ywin ignition. Bought it with a gm carb adapted to it. Research says it should have a Marvel carb. Does anyone have one to fit? Would want complete and rebuilt.

[carbking]

31Nash880 - the original carburetor would have been a Marvel type DO (or DN, depending on which Marvel literature you are reading). The original part number would have been either 10-940 or 10-941 (depending on if the carburetor came with a car, or was sold through a Nash dealer's parts department).

 

These are some of the weirdest carburetors one will ever see. 

 

The DO was (D)owndraft (O)akland, as that was the original application. Other than the Nash, these carbs were used only on a few years of the Oakland and Pontiac V-8 engines.

 

GUESSING that the 1932 Pontiac V-8 carburetor is close enough where minor jet and spring changes to Nash calibrations would do the job.

 

In 50 years, I have owned one of the Nash versions, and 3 of the Pontiac versions, so obviously the Pontiac versions are 3 times as plentiful

 

Jon.

[32buick67]

19 hours ago, Hubert_25-25 said:

This is my latest data on Marvel Carburetor springs.  I learned more than I expected.  It would be nice to know the spring data for all the Marvel carburetors in case one of our Buick buddies needs a spring, we will be able to tell them what they need.    Hugh

 

 

Is this also useful info?

I will do some more digging to see if I can find more.

 

 

List of Marvel parts in my original 1932 paperwork.

 

 

Edited January 11, 2022 by 32buick67 (see edit history)

[AussieBuick]