Standard Carb Jet Sizes

[Roger Pennington]

This list of standard "default" carburettor jet sizes was posted elsewhere by Jim and I think merits being copied here as a sticky, for posterity. Thanks Jim!

while we're on the subject and I have the manuals out, standard jets are listed as:

SE5 40 DFA-1: main jets 180, idle jet 60, idle jet air bleed 200, accelerator pump jet 50, air correction jet 185 with F2 emulsion tube
SE5/5a/SE6/6a 38DGAS 3A: main jet 145, idle jet 45, accelerator pump jet 60 (OD) / 70 (auto), air correction jet 185 with F50 emulsion tube
SE6a Tamperproof 38DGAS 3A (from auto #1415 & OD #1692): main jet 142, idle jet 45, idle air bleed dia 195, air correction jet 185.
SE6b/GTC Solex (Pierburg) 38EEIT: main jet 150, idle jet 50, idle air bleed dia 165 (OD) / 175 (auto), air correction jet 200
SS1 1300 VV: main metering rod FDK.
SS1 1600 Weber: main jets 112/125, air correction jets 160/150, idle jets 50/60, emulsion tubes F30/F30

[scimjim]

perhaps a Sabre afficianado would like to add the S6 single & triple details?

[philhoward]

Not sure if H4 and HS4 carbs need different needles but the H4's in a Sabre 4 are supposed to be GS with a Red spring.

the GE\R is correct for a Sabre six with triple HS4s

[toomanysabres]

The SU's in S4 & S6 can benefit a great deal with a 1.1/2" K&N Stub Stack inside the air filter.
http://www.rimmerbros.co.uk/Item--i-RL1 ... edium=feed

[John Cassingham]

Would anyone know the correct jets etc for a 38 DGAS Weber, on a standard 2.8 Auto GTC?

[scimjim]

As far as I know, Ford only fitted the Pierburg or Weber 2V to the 2.8? Presumably Nigel at QRG would know as I think he offered the conversion at one time (as well as RR, JW, etc)?

Unless there's any definitive answers on any of the Ford forums etc, I think the 6a jets would get it running well enough to fine tune/rolling road

[philhoward]

Apparently Fast Road Cars know - so will probably happily sell you a set, John?

[ScimmyMike]

Yes, FRC supplied me with a dgas suitably re jetted, it's also on their website as such an item as well, great service but not the cheapest, you get what you pay for though, experience and good advice.
Just one small thing, don't use the webcon piping that comes with the carb, I did on the 6B tank and when removing to sort out the spiders noticed it had gone rock hard and not at all flexible

[scimjim]

any idea what jet sizes were fitted Mike?

[toomanysabres]

Not sure if H4 and HS4 carbs need different needles but the H4's in a Sabre 4 are supposed to be GS with a Red spring.

the GE\R is correct for a Sabre six with triple HS4s

A follow up to this was when Oselli set my Sabre 4 up on their rolling road they wanted to change the needle from GS but didn't have one to suit so the guy took them and trimmed them on a lathe.

[toomanysabres]

I have recently applied an overhaul kit to one of the carbs of my Sabre 4 due to the base rubber seals 'weeping' a bit.
So I wanted to share a tip that NNG came up with for centering the jet. This is quite tricky as it is only really held in position by the tiny cork rings inside since it has to slide up and down for choke action. It will not stay in position on final tightening of the big nut with a 22mm spanner. It has to be clear of the needle in all positions of the movement of the rising vacuum piston.

Here are the materials
eat or bin the contents of :-

cut out a bit of a smooth band and fashion into three precision 0.006" slip gauges like this:-

place them into these positions and finally do up the nut underneath securely.

after pulling the strips out the jet will stay in place.

Please note it works just as well with spaghetti or soup

[Ollieoldbeard]

Is it possible to blow out main jet with carb in situ on a 6a. ??

[AJL Electronics]

Only if you want a petrol shower! Just use a good fitting screwdriver and take them out.

[Ollieoldbeard]

Thats fine, but the carb can stay on, which screw/s is it ?
Thanksp

[AJL Electronics]

The pair of jets in the bottom of the float bowl.