Twin Carbs and Fuel Economy Question?

[type2tattoo]

Hi I have the possibility of getting a nice new set of webber twin carbs a little cheaper than normal, my mechanic friend really wants me to get them, I think mainly because they look nice. I just want to get my bus on the road and keep it there.

I have been told that they will seriously affect the fuel consumption by as much as 13 mpg, is that right? what do people think?

Any advice much appreciated

 

[67panel]

what size are they ,36s on a stock 1600.economy will depend on jetting to some extent,if not after out and out performance can get away one size smaller jet.best set up on rolling road.problem is more performance u will use it = more fuel used.FIT THEM ANY WAY 8) :lol:

 

[K@rlos]

I've got twin weber 40's on a 1600cc, the fuel economy is a bit worst around town tbh but on a run its alot better. Saying that mine does need re jetting to lean it out a little. The benefits out weigh the negatives, but alot of it's to do with how heavy your right foot is which is sometimes my problem :lol: you will deffo notice the gain in power though.

 

[sparkywig]

I've got 34 ICT's on my single port. Much better on fuel now and runs so much nicer.

 

[ianscooby]

running 40's on a 1776 much better economy that standard on a run

 

[sparkywig]

I've got 34 ICT's on my single port. Much better on fuel now and runs so much nicer.

As long as they're set up properly.

 

[creationblue]

I've got 34 ICT's on my single port. Much better on fuel now and runs so much nicer.

Ive got this set up too along with a exhaust and J-tubes, but the key is setting it all up, i spent the same on the rolling road as i did on the carbs, but the results are worth it! And yes much better gas millage

 

[the.fordhams]

Economy - I got about 24-25mpg (US gallons) on a long run with a fairly stock setup (009 and muffler were the only non stock stuff). Then after changing to duals and a couple of other mods like high lift rockers and a mallory vac distributor I got some extra performance and the economy went to like low 20's - maybe 21-22 mpg. Bear in mind this was a heavy 71 westy in the US, so UK mpg should be about 10% higher.

Now that we're back in the UK we'll be looking to get the economy back again somehow - mainly with less right foot, but to be honest with a 1600 and a heavy westy you'll spend most of your time in the throttle. For example my nice vac advance dizzy is not really giving me more mpg as I spend most of the time above half throttle - vac advance only works part throttle and less.

Also depending on the carbs you'll have to cut off the stand for the oil cleaner, unless thats been done already.

If they are big webber 44's expect a small challenge to jet them right for small stock engines.

Is your bus a brake booster bus? Check that the intake manifolds have the booster hook up port.

Finally what dizzy you running - you'll have fun successfully hooking up the vac ports for the stock dizzy. 009 will be ok though.

 

[creationblue]

One thing you will need to do if running a stock SP as i was, is that the Vac advance only Dissy will have to be changed for a Vac/Mechanical advance unit, mine seemed to run fine until we set it up on the rollers and it proved that the dissy wasnt making enough advance and hence no power at higher revs. There is also a bit of plumbing to do with the advance take off to the carbs and the inlets.

 

[sparkywig]

Sorry, should've said I've got an 009 dizzy fitted as well.

 

[type2tattoo]

Cheers for the info chaps The engine is a 1600 TP long block, rebuilt by Laurie, its still in my lounge at the mo so I am collecting parts, I have a 009 dizzy and electronic ignition, standard exhaust and ummmm nice powder coated tin wear lol

I will see my friend at the weekend with the carbs and ask what they are The bus will have no interior when I first (if I ever) get her on the road so will be quite light, should go like sh@t off a shovel then?

 

[type2tattoo]

.... and I remembered I can text him :roll: They are weber twin 40's anyone got pics?

 

[K@rlos]

Don't mean to hijack the thread, but what is the most poplular twin carb producer. Weber, Dell'orto, Solex etc?

 

[Guest]

Don't mean to hijack the thread, but what is the most poplular twin carb producer. Weber, Dell'orto, Solex etc?

probably weber then dells (could be the other way)

 

[K@rlos]

.... and I remembered I can text him :roll: They are weber twin 40's anyone got pics?

Good carbs, give them a good inspection before fitting them though. Check the accelerator pump diaphams, all the seals and the small gauze filters in the housings where the fuel pipes go on