Increase in horsepower?

[meowdmucker]

Please excuse my ignorance but would fitting twin carbs. and a sports exhaust make any noticable difference to a stock 1600 engine or is it mainly for show on an engine like this? Also as I have an oil filled air filter, it looks like the oil pan bracket would be in the way of one of the carbs. I guess folks just cut this away ?

 

[Shaggy]

I think it would I might be wrong but the exhaust give better back pressure which helps and the Twin carbs are more accurate as the petrol does not have as far to travel and each carb is only supplying 2 cylinders rather than one supplying 4, although I am sure I will be corrected on something

 

[Clarkson46]

Shaggy is basically right. The stock VW carb and manifold is very restrictive as is the stock exhaust. So anything you can do to improve the flow the gas flow of the engine will improve the performance. Twin carbs and an extractor type exhaust. Stock dissy will be fine. And yes the airbox bracket will have to come off with twin carbs. Under no circumstance go down the 009 route unless you really want to ruin the performance.

 

[froggy]

would fitting a different single carb make any difference? thinking maybe a weber.
Lokking at doing something different to my stock engine without breaking the bank.
Deffo gonna get a different exhaust but dont know what carb to go for

 

[Shaggy]

It would but not much to notice, the issue is with getting the fuel into the heads in the most efficient way, and one carb supplying four is never going to be as good as one supplying two, as always its lots of things that make a difference, I guess what you want is fuel in fast and out fast. If you are note bothered about MPG I would go for Twins and put my foot down lots but I was told that there is no point going too big on carb size as you will not be able to burn all the fuel and it will just be wasted.

Take what I say with a pinch of salt though as I am just reading about all of this and learning everything.

 

[froggy]

I understand what your saying about 1 carb suppling 2 instead of 1 suppling 4.
If i decide to go down this route what size carbs work best?
Does anyone do a complete bolt on kit, ie, carbs, manifolds, linkages etc etc.
Its all new to me

 

[Shaggy]

Not sure, but I am sure someone will, I have a 4 in to 1 header and a 1641 with a single 34pict3 carb running a 009 dizzy (soon to be changed to a vac dizzy for a smoother ride and better MPG) and I can get up to 80mph on a motorway not bad acceleration.

You can get a Progressive 32/36 Carb which give a good power output I think I would go down that route.

 

[meowdmucker]

Thanks for the tips guys. My van has had a 009 dizzy since I've owned it (9 years) . I've not had any trouble with it that i'm aware of but do you recommend changing it back to a standard vacuum one?

 

[Shaggy]

Well the .009 gets a lot of bad rep when used with a 34pict3 carb the problem with it is it only advances over 1200rpm so you get a bit of a flat spot when you put your foot down, an engine ideals at about 800rpm, where as a Vac Dizzy uses the vacuum from the engine so as soon as you open up the throttle to dizzy advances straight away giving you a smoother ride and more efficient.

I am changing mine as thats what it was built with

I know the .009 is really meant to be used on high revving engines like I think the early Porsches used them and their argument for it was if you buy a Porsche you drive it fast. And also VW built a lot of engines that just run at one set of revs.

Cars run variable revs there for the Vac dizzy is very good.

I think thats sort of right

 

[meowdmucker]

Cheers Shaggy, trouble is my 'need to buy' list keeps getting bigger!

 

[Shaggy]

Yeah thats my problem as well I still need to lower my van, but other things keep coming up

One day it will be slammed

 

[froggy]

Found this kit on Cool air

http://www.coolairvw.co.uk/ca/3764/mia/d/weber+32+36+progressive+carburettor+kits/pid/6555155

might be another item to add to the 'wish' list

 

[Shaggy]

Damn it you can't just give me links like that now I want that...hahaha

 

[Tofufi]

IMHO, twin carbs are 100s of times better than the Weber Progressive.

The Prog. doesn't solve the problem of the long manifolds, and it is tricky to tune because of the tuning screws facing the fanshroud.

:wink:

 

[speedwell68]

Found this kit on Cool air

http://www.coolairvw.co.uk/ca/3764/mia/d/weber+32+36+progressive+carburettor+kits/pid/6555155

might be another item to add to the 'wish' list

Those progressive carbs aren't really suitable, they are a pain to setup and are no real improvement over stock, the problem with stock is the manifold, not the carb. Most Webers now are chinese made and are frankly crap. I'd go for a pair of genuine Italian Weber 34 ICTs or Dell'orto 34 FRDs. Have a look on theSamba.com there are lots second hand setups on there to be had cheaply. I got a pair of Dell'orto 34 FRDs and manifolds from the US for £168 delivered to my door. They cost me £46 for a reasonable linkage and £50 for a pair of CB performance upgrade/overhaul kits. Worth every penny. My bus now does over 30 mpg on a decent run and pulls very well. If you couple this to the best 4 into 1 exhaust you can afford and a stock SVDA dissy, you'll have a nice smooth running bus.

http://www.thesamba.com/vw/classifieds/detail.php?id=610826

http://www.thesamba.com/vw/classifieds/detail.php?id=566348

These two are just examples of what can be got.

 

[Shaggy]

What do you have to look out for when buying Carbs, as in what is not repairable?

 

[speedwell68]

What do you have to look out for when buying Carbs, as in what is not repairable?

I'd say that if the carb bodies aren't cracked or damaged most will be overhaulable.

 

[Shaggy]

is a big key to get them with manifolds?

 

[speedwell68]

is a big key to get them with manifolds?

If you can get a complete setup, manifolds, linkage and filters, then that would be better. But manifolds, linkages and filters can be got quite cheaply anyway.

 

[Shaggy]

Ok cool thank you dude, I am gonna stick with the stock for now as I am still learning how it all works and how to set it up, but next year it would be nice to upgrade