Carburetors; Webber 40s Again. Just to have one twin webber?

[Fastededdie]

Obviously as we are all aware Tripple Webbers can be the best and very powerful and Sounding sport as. But also tricky as we'v written on in another post.

Instead of using 3 pairs on our cars is it possible to put just one twin webber ? Can't see why not as the old SUs ran 2 carbs. Will a `40S Weber bolt onto the old import manifold? Would make life so much easier. I could then sell 2 X twin webbers if this could work. Any advice would be great .

 

[Rob Gaskin]

Obviously as we are all aware Tripple Webbers can be the best and very powerful and Sounding sport as. But also tricky as we'v written on in another post.

Instead of using 3 pairs on our cars is it possible to put just one twin webber ? Can't see why not as the old SUs ran 2 carbs. Will a `40S Weber bolt onto the old import manifold? Would make life so much easier. I could then sell 2 X twin webbers if this could work. Any advice would be great .

It would need a one-off manifold because the SUs are further apart.

You would also need a bigger carb than a 40DCOE, maybe a 45 or 48 and with the choke tubes to this carb matched to the engine. Each choke is now feeding 3 cylinders instead of 1.

I would like to see this done but it would take a lot of work and tuning.

Did you see this?

'Split Webers' on an S30

Do we know if anyone has tried 'split webers' on our cars? It occurred to me that one way to fuel an L series engine without using old SUs, expensive fuel injection or triple twin-choke carbs would be to use either one twin-choke OR to use two twin-choke carbs but only half of them i.e. just...

zclub.net

 

[Rob Gaskin]

We need 'Ali' to start a little project on his 260Z.

 

[yellowz]

We need 'Ali' to start a little project on his 260Z.

GoFundMe?

 

[Fastededdie]

It’s all very interesting and if someone had the formula to make it work I think it would be the ultimate set up IMO . Thanks for sending me the info Rob .

 

[atomman]

By now most things have been tried out on L series engines but I haven't seen a single side draft on a 6 cylinder to be fair, It would need a special manifold and the outer runners feeding 1 & 6 would be pretty long & I don't think the float bowl on one DCOE would be big enough to feed all 6 cylinders to be honest

They did have one down draft carb feeding 6 cylinders on the 240C though I think ?sure I have one somewhere

 

[Rob Gaskin]

It would only be any good on a standard 2.4 I'm guessing. In vintage days huge multicylinder engines ran on one carb.

 

[Albrecht]

It’s all very interesting and if someone had the formula to make it work I think it would be the ultimate set up IMO .

In engineering terms, the 'ultimate' carburettor setup is for each cylinder to have its own individual venturi and fuel metering, which is exactly what the classic Weber/Mikuni-Solex/Dell'Orto triple side-draught conversion gives you.

If ease of use/fit-and-forget is the goal, maybe a factory manifold for a single downdraught carb - as used on Nissan sedans - is a choice? You'd still need to work out a suitable linkage, filter and jetting though. Back to square one.

Part No.2 here:




In my experience, people are quick to blame carbs for any poor running issues and the very first thing they do is start mucking about with them. Plenty of screws to twiddle with, so it is very tempting. Often the real culprit lies elsewhere...