Ferret Carb

[Steve Mortimer]

The numbers on the carb are as follows
40NNIP
RE16434
849

The other side has
Marcus
British
Pat'd

[Richard Farrant]

Originally Posted by Steve Mortimer

The numbers on the carb are as follows
40NNIP
RE16434
849

The other side has
Marcus
British
Pat'd

Thanks Steve,
40NNIP is correct type, the only specification number I have is the Solex one, which Marcus would use as well, that is S1682 for a Ferret. The RE number is a Rolls Royce stock number. Those carbs used on 8 cyl engines could be considered identical, but I believe jet sizes differ. Will have a delve later on and let you know sizes for a Ferret.

[Richard Farrant]

Hi Steve,
The jets in a Ferret carb are as follows ( sizes are marked on the head face so no need to remove ):
Main jets (2 off, either side of economy valve); 190
Starter jet (1 off, between the two mixture screws): 180
Aux. or Pilot jets (2 off, above economy valve); 55

[Malcolm Towrie]

Richard, the main jets are 130 as shown in this link and also what I have seen in a few carbs. 190 is the air bleed (correction) jet for the main circuit.

http://www.ferret-fv701.co.uk/mnuls/...40nnipcarb.pdf

Steve, FYI, I have worked on two Ferret 40NNIP carbs that also had RE16434 stamped on them.

Malcolm

[Richard Farrant]

Originally Posted by Malcolm Towrie

Richard, the main jets are 130 as shown in this link and also what I have seen in a few carbs. 190 is the air bleed (correction) jet for the main circuit.

http://www.ferret-fv701.co.uk/mnuls/...40nnipcarb.pdf

Steve, FYI, I have worked on two Ferret 40NNIP carbs that also had RE16434 stamped on them.

Malcolm

Thanks for the correction Malcolm.
I was going through the British Army parts list and noted them down wrongly, well spotted. Well look like Steve's carb is correct then from your confirmation of RE number.

[Richard Farrant]

Looked back at the parts list and the correction jet and main jet were wrong way around. Just shows you cannnot to rely on official publications.

[Malcolm Towrie]

The two carbs stamped RE16434 had 22747 and 19195 stamped underneath.

Two other Ferret 40NNIP carbs I worked on were stamped RE14549. They had 5537 and 6264 stamped underneath.

I have to think these are serial numbers, so Solex made a lot more RE16434's than RE14549's? I didn't notice any difference between the two RE #'s.

These were all Solex carbs, with no sign of the "Marcus" designation Steve refers to. What is that? Did Marcus make Solex carbs? Is that why the "849" number is so low relative to the above numbers?

FYI, as you can see from the 40NNIP number in the photo below, the 40 and the NNIP were cast into the carb body, and the 0 was stamped.

Malcolm

DSC-T99987small.jpg