Progressive Carbs

[Shaggy]

So are they any good, well my issue is I need better fuel consumption, not to bothered about power too much, what should I do, I don't have lots of money and I want to be up and running by april, at the moment my van eats petrol and its getting fat...some advice would be very welcome

 

[ProfessorWheeto]

You might be better with something like twin 34s rather than a single progressive, think the shorter manifolds increase efficency?

 

[Shaggy]

Yeah I was thinking that, but its alot more money, I just wish there was a get this and you will get this much power and that mpg

 

[froggy]

If you manage to find anything that increases the MPG let me know
Just on tick over on the drive it drinks a 5 lt can of fuel and soesn't even come off choke, well maybe a little but not fully

 

[Shaggy]

Well I heard with twin carbs you can get about 30mpg which I would be very happy with

 

[dubberdaz]

I read in Volkworld that a well sett up progressive carb on a standard 1600t/p with a 4into1 exhaust system you could be looking at an extra 10 horses!! :shock: WOW! :lol: Not bad really i spose.....

I run one, but think it needs setting up better :?

 

[creationblue]

Well I heard with twin carbs you can get about 30mpg which I would be very happy with

I dare say that is possible, but things to consider:

Cost of the Dells (or webbers)
Cost of the manifolds
Time modding the linkages
Cost of Rolling road

When I priced it up on my old 2.0, the rolling road session was more than the £600 for the carbs :!: Granted if you have just spent $$$$s on a trick engine its well worth it, but i just wanted my motor to run sweet :roll: and that option just wasnt worth the money IMO.

CB

 

[Shaggy]

There that is ture, but I have some stuff to sell and get this the GF just said she would sell some of here stuff to raise the money

But I would like a more fuel efficent car in the long run, I have a Remtec Street Performance 1600cc so what should I get is it 34, 36 or 40's what would be best, then I can start working out how much to get together

 

[easy]

Since fitting the twin 34icts on my 1600 the fuel economy is better as long as you drive it "normally" and dont be tempted to put your foot down!

I got from Bristol to Cornwall Jamboree, then on to Newquay for a week, drove around for the week (just to the surf spots locally) and then had to refill it on the way back! :shock: dont know what it equates to but it was £40 a tank last year so that not bad atall in my book 8)

 

[halfpint_fighter]

I picked up a pair of Dellorto DRLA 36's for about £120 off Pete Nice about 2 years ago and then bought a new CB Performance kit at volksworld show with manifolds, linkage and filters for about £160 (i think).

Then add on about £30 for new 55 idle jets (the alfa ones are too small) and a couple of gaskets to replace when setting the float level.

£10 for the DRLA bible.

If they have never been fitted on a VW then they need drilling and tapping to fit the air filters. (2 holes in each)

Then some 8mm fuel hose and either a 6mm to 8mm adapter or use a fuel filter with tapered barbs to go from 6 to 8mm.

If you want to be fancy you can get choke block off plates for when you remove the chokes and special 11x8 nuts which are easier than 13x8 nuts on the manifolds. (exhaust nuts are 12x8 so are a little better)

You will also need to cut off the air filter support bracket (easier in an early bay than a crossover or late)

Clean them, pre-tune them, fit them and drive!
Obviously you would be best of fitting a 4into1 manifold and back box at the same time.

I have this on a bog standard 1600 twin port with electronic ignition and a blue coil with 8mm silicon leads.
Defo better mpg and more power. I have never had a rolling road session so they could be better.

 

[Shaggy]

that sounds cool, I have a 4 into 1 and a 1641 so I am some of the way there

 

[Guest]

DRLA or ICT, pro/cons and differences in a nut shell?

 

[MMMC]

I've got ICT 34's from CB performance. the mechanic that sorts my engine out has always said he dosn't like dual carbs but he has to admit these ones are very good. They stay in balance and are fairly easy to sort. In terms of fuel economy probably a little better but its never going to be great. In terms of power - vroooooom!

 

[halfpint_fighter]

This is great

http://aircooled.net/gnrlsite/resource/articles/carbs101.htm

Basically ict's have one barrel to feed 2 pistons (1 head), where as DRLA's have 2 barrels to feed 2 pistons (1 head).

So on a twin port engine having twin drla's means every piston has it's own fuel jets. Thus they can be kept smaller and more efficient.
Also it has 2 circuits. The idle jet for idle and low revs and the main jet for medium to high revs.

Combined with short manifolds you get less atomisation (when the petrol condenses in the stock manifold) so more efficient.

The next thing on my list is to get the manifolds/heads port matched and polished as that will make the fuel mixtures journey smoother and again more efficient equalling more oomph :lol:

 

[baron]

I've got ICT 34's from CB performance. the mechanic that sorts my engine out has always said he dosn't like dual carbs but he has to admit these ones are very good. They stay in balance and are fairly easy to sort. In terms of fuel economy probably a little better but its never going to be great. In terms of power - vroooooom!

lol

i have a progressive, fitted by the same mechanic

it works fine and delivers good economy - but i did used to run a 1679 with 110 cam on a stock carb, so prob not the best comparison

i was really hankering for twins, my mechanic even fitted a phat engine with twins and brought it round to show me. but he could never get it to run cool, so sent it all back and fitted a 1641 with a progressive.

tbh my old engine had more power and torque, but i think that was the death of it in the end. i now have plenty power, but nothing silly, and good economy. oh, and it was LOUD with the cam in it.

so I'm larry as happy with my prog

but if i were going twins, I do it proper and get drla's

 

[Guest]

cheers olly, certainly makes it alot more sense to me now