VCCA Home Forums TECHNICAL - GENERAL Trucks and Vans Carter W1 carb

Do you guys know if the Carter W1 on a 1941 car is the same as the truck? I figure it must be, but I have to be sure when ordering parts.

Thanks

Chevtrkmn

Its is the same - unless its a COE with a down-draft.The same kit was used from 1941-48 as there were no major changes made during that period.

At least three different carbs were available for 1941 models. The 483S was the standard carb on both cars and trucks. 492S was the economy carb for both. And a 515S available for gov't vehicles. Later a 518SA was also available.

What year was the last year a Carter W1 was standard on a Chevolet passanger car? I have a nice one that I took off of a 1951 216 engine, it don't have a tag, is there a way other than the tag it can be identified? I am not too whoopie on the Carter W1. I prefer the Rochester Model B instead. for my six cylinders.

I have a Carter W1 on my 48 Chevrolet 216 Thriftmaster and tried to find a kit for it. I have no tag either and I think the person that was trying to help me gave up. It would seem that there should be a generic W1 kit somewhere.

do either of you have a casting number on the carb?..


epi

The last year for a Carter W1 on a Chevrolet was in 1949. The carburetor used was a 684-S.

On the side of the carb with the "Carter W-1" casting logo there is a 2(?) digit number just to the right and up on the flange on the side
of the upper carb body. The number that was real plain was a "15". A possible "2" or "3" may have preceeded the "15". There is no number on the flange per se. I was told that there were no tags for this carb and that there should be one on the flange. Not on mine...perhaps the tag was lost. I found out that most of the difference is in the pump diameter for the W1.

To help identify your W-1.....

The 1941-49 W-1 are the only years that had a 1 1/2" throttle bore opening.Prior years it was 1 7/16.
If its a 1949 it will have a fast idle linkage (to the rear)-it is connected between the throttle linkage and goes up to the choke linkage.It increases the idle speed when choke is used.
The standard 1941-48 will have a #93 (stamped on top) metering rod jet - bottom of bowl - metering rod inserts into it.The metering rod will have the rasied numbers (top of rod) 67-46 on one side and 75-485 on the opposite side.These are the standard mixture parts ....if it has a step lean or rich will be slightly different numbers.The RARE economy carb. will have an 83.5 jet and 625-46....75-508 rod.It also has the throttle linkage blocked to prevent full opening of the throttle plate.If the original paint is on the cast iron body the standard will be black and the economy brown.The economy engine option was very rare and usually sold for fleet use only.
If your numbers differ from the above please post them.

Thanks Gene.

To add to Gene's post:

1932 has idle mixture screw at top with no distributor vacuum port

1933 has idle mixture screw at top and distributor vacuum port

1934-1935 have idle screw at bottom, but still have 2 screw airhorn

1936 has 3 screw airhorn, but still has 2 screw bowl cover

1937-1940 has 4 screw bowl cover, but still has round accelerator pump

1939 and 1940 carbs are the same

1937 and 1938 can be differentiated from 1939-40 by the throttle arms.

Jon.

Thanks everyone.

I have a Carter YF that was on my 1938 Chevy truck when I aquired it. I ended up with a W1 in a box later in a trade that pretty much cost me nothing, but is from a 1941 car. I figure it will fit my engine. Or do you think I'm better off just rebuilding the YF? Is it a better unit and easier to get parts? I realize neither unit is original from the factory. I'm restoring this truck for fun and although I am concerned about originality, I am not putting together a "show" vehicle.

Hey Mr. Mack, what's a Rochester B?

Thanks again

Chevtrkmn

The 1941 W-1will fit wour engine but not your linkage.Also jetted too lean for a 1938.Will give a lean "surge" at a steady 40 or 50 MPH.
Parts are very available for each.Note that the 1938 truck originally had a restrictor in the insulator below the carb....this was to govern engine speed.Can easily be removed.This is waht caused a truck to have a lower HP rating than a car.
A Rochester model B was the carb. that replaced the W-1 in 1950.Was used on the new cars and sold thru parts as a replacement for the W-1 on the older models.The first 2 years it had many problems.

The Rochester B was as Gene said the improved modernized carb that Chevrolet replaced the old W-1 with in some 1950 and all 1951 cars. Many Chevrolet lovers preferred the Carter over the Rochester and used the Carter as a replacement, and some still do today.
The Rochester was used as long as the 235 and 261 engines were produced, there is many variations in the intake size, some with auto chokes some with different size air horns, later versions had a vent system built in. Also other makes used the Rochester. The Rochester B, BC, BCV carbs could be rebuilt using a basic repair Kit that included different gaskets for the variety of models

I get my kits from The Filling Station and have had good luck with them!

Note that this thread is from 2006.