The Stovebolt Site Forums The Shop Area Engine Shop Carter type W-1 585s

Will be adding this to my article on W-1 carbs, but wanted to get it out here:

This is maybe the rarest, certainly in the top 3, of the Carter type W-1 carburetors, tag number 585s for WWII military trucks.

Carter says Chevrolet 235 and 270 CID engines. Is the 270 CID right, or is the 270 CID a GMC engine?

Technically, the finish on this carburetor is incorrect; as Carter sprayed the entire carburetor with semi-gloss black paint for the military.

But I wanted to show details, and I am technologically challenged in trying to take detailed digital pictures with an iphone. I did very well with my old Canon 35mm SLR, but unable to get film developed locally anymore, so cannot easily use it. I bought one of the electronic whizbang digital cameras, but after trying it out, quite obvious this thing was designed for someone with a post-doctorate in electronics and that is not me!

So, pretend that you are looking at pictures which are totally black

There are many obvious differences from the non-military W-1 carbs; the most obvious being the airhorn for a bolt on air cleaner, the non-machined boss where an 1/8th pipe tap would normally be present for vacuum advance, and the rubber boot covering the pump/metering rod operating rod.

Upon closely inspection, one finds that the boot is actually a dust seal for the area above the bowl cover. Other dust seals are: throttle shaft bearing surfaces, choke shaft bearing surfaces, and the idle mixture control screw. If one looks closely in the pictures (picture 3), one can see a flat metal washer between the idle mixture screw tension spring and the casting. Not visible is a fiber washer between the metal washer and the casting. The metal washer is present to protect the fiber washer from the spring.

So below (I hope) are pictures:

[img]http://www.thecarburetorshop.com/585s_1.jpg[/img]

[img]http://www.thecarburetorshop.com/585s_2.jpg[/img]

[img]http://www.thecarburetorshop.com/585s_3.jpg[/img]

[img]http://www.thecarburetorshop.com/585s_4.jpg[/img]

[img]http://www.thecarburetorshop.com/585s_5.jpg[/img]

Obviously, I did something wrong with posting the pictures, but if you click on the links, they show up.

Jon.

Man, that is cool! Thanks for posting Jon.

Jon,

Great px.

Ed

After posting, had some time to play with Google.

Carter stated that the 585s was used on Chevrolet 235 and 270 engines. In fact, the 270, as I had asked in the first post, is a GMC.

Did not find good engine specifications (HP, max RPM) on the military 235 (Chevrolet) or the 270 (GMC); but these carburetors are little more than a sealed version of the 574s (1946~1948 216 CID Chevrolet civilian version). Same venturi size (1 1/4), same vents, same jets (slightly different metering rod). The main difference (other than sealing) was Carter specified the fuel level in the bowl of the 585s to be 1/8 inch higher than in the civilian 574s.

When Carter offered the replacement YF carbs, the 1 1/4 venturi was specified for the 216, but the replacement for the 235 got a 1 5/16 venturi.

Wonder how the mid-1950's 235 would run with a 1946~1948 574s W-1 with a slightly higher fuel level?

Jon