Re: [HSS] Marvel Carburetor Jets

Tom Goodman wrote:

> Background: Standard Jets for Marvel "VB" Carburetors are specified

> in the book that Pete so generously shared as follows:


> High Speed Jet P/N 49-140-D-28

> or 49-160-D-28


> Intermediate HS Jet P/N 49-220-E-24

> or 49-180-E-24


> (the reason for the "or" is that Marvel made a change mid-run to get

> better performance, I suppose)


> Now: According to the Marvel book (P 13), jets should be changed for

> high altitude operation. We already knew that and Geoff suggested a

> real good way to do that with wire hanging into the opening of the

> jet.


> Marvel's suggestion for High Altitude operation is to use the

> following jets:


> High Speed Jet P/N 49-130-D-28


> Intermediate HS Jet 49-170-E-24


> Question: Does the second number in the part number indicate the jet

> size? For instance, in a 49-130-D-28, is the jet size .013"? That

> sure would stand to reason as far as I am concerned. If so, this

> gives me some indication of (1) what I have and (2) what I need to do.


> Thanks for enduring all of this and for your responses.


> Tom


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Regarding sozes, yes, the middle figure designates size, but I have

never bothered measuring the actual size of the hole, but the larger

number is a bigger hole. I have reduced the main sizes as mentioned

before. If anyone had a set of numbered drills then the actual

diameter could be ascertained by inserting the right number drill in the

jet and measuring the dirlll with a micrometer or dial gauge, but I go

by the "hit and miss" method, and it works fine. Remember that it is a

combination of float level, flapper spring tension, and jet size that we

have to consider, and all three have to be spot-on to get your Marvel

working correctly, taking into account also the height above sea level.

Have fun!

This discussion has been closed.