VW polo/golf Carb query

[ToolsnTrack]

How do folks!

I have just shoehorned a mk3 golf 1.4 into my brothers breadvan Polo. We are just about at the startup phase and only have the stock polo 1.0 Pierburg carb and manifold to run on the golf engine. I gather this will probably start it but i don't hold much hopes for it running well with it. Is there a Golf carb equivalent that will bolt to this manifold? Can anyone clue me in on what carb i should be looking for that would work out for this application? Or even better, does anyone have a carb setup that would work?

Although its a 1.4 in a small car, it does need to be reasonably good on fuel, so a whopping set of Twin 40s are out I'm afraid!

Thanks for your help!

Tom

[monkeytennis]

What did the mk3 golf engine have on it in the first place? I'm assuming it's an AEX injection engine, but as I'm unfamiliar with this particular engine, I'm not 100%

Either way you look at it you're going to need to make/modify a manifold to take your carburettor,... Twin 40's needn't be fitted to this, but I'm sure you could fit a reasonable Single choke Weber on this and get good MPG, performance, and reliability. This has undoubtedly already been done.

my little short-list of carbs that I would consider would be:
**Small single Weber
**SU HIF44
**Bike Carbs

I would lean reasonably strongly towards the Small Weber to be honest,.. they can be set-up to run efficiently, and the Odd VW here and there came with a Weber as standard anyway which always helps things.

[ToolsnTrack]

But which small weber? And already runnign a pierburg on a tein choke 2 bolt manifold, are there similar webers out there?

I did get her running today:

[monkeytennis]

The Pierburg 2e3 (looks like a 2e3 in the video) that you have fitted will run fine but will need the correct jets for it to be useable as the ones from the 1.0l engine will be completely wrong. It is a good carb, and since it is clearly working,.. There's really no gain from fitting a different set-up.

I would get the Pierburg set-up (the Haynes Pierburg manual is a godsend if you're unfamiliar with Pierburg stuff) and jetted correctly.

If it is a 2e3 - then I can suggest following what Haynes lists for the Jet specifications on a 1.4 engine which should be right up your street :-)
Main jet - 95
Idle Jet - 45

[ToolsnTrack]

Ahh, dude that's exactly what I needed to hear! I'll get the rest of the car together and hunt out a carb spares place.

Thanks for the reply!

[monkeytennis]

'Gower and Lee' may be able to help you with Jets etc... they're a little hit and miss with what they can get and can't get,... but generally... they're pretty useful.

Don't be suprised if parts are a little pricey. A lot of things are discontinued or obsolete now. But the 2e3 was fitted to plenty of cars,... so there's lots of scope for getting 2nd hand parts.

[g40jon]

wouldnt touch the pooburg. if it hasn't gone wrong, it soon will do. they are a very complex carb and run very well when new or freshly rebuilt. Sadly most are neither, so almost always run like a bag of poop.
weber dtml or dmtr would be my carb of choice

www.clubpolo.co.uk/forum/index.php?showtopic=250943

www.clubpolo.co.uk/forum/index.php?showtopic=126734

If it were me I would ditch the carbs completely and would have run it on the SPI setup it would have been fitted with on the golf. Its a fairly simple injection system, very reliable and good on fuel

[guz]

swapping to SPi should be plug and play.

[ToolsnTrack]

Spi isn't an option. Car needs to be simple.

Those links make for some good reading! Think I need to get myself into club polo!

[g40jon]

spi is simple! it'll bolt straight on, the loom is pretty much plug and play. you wont need to mess around trying to set the fueling up. if anything it is an easier and much more reliable option imo. every mk2 polo ive owned (ive had a few), ive hated, purely due to the crappy carb! It's not always been the same type of carb either. tried the pooburg 2e3, that was tripe, so was the 1b3. I didn't find the weber 32 tla much use either! Only carbs ive ever had much love for are the su carbs, which incidentally are reasonably easy to get running on the vw small block engines

[guz]

get on and run a carb then, i'm telling you
swapping to SPi is a piece of pi55, the first
engine swap i did was a mk2 coupe S to a
mk3 GT, twas easy, only wiring changes iirc
was a wire to feed the rev counter, a feed to
the pumps and changing the multiplugs to the
front indicators. or you can pi55 about with carbs
and never get it right.

[ToolsnTrack]

Mar 17, 2012 11:09:38 GMT guz said:

get on and run a carb then, i'm telling you
swapping to SPi is a piece of pi55, the first
engine swap I did was a mk2 coupe S to a
mk3 GT, twas easy, only wiring changes iirc
was a wire to feed the rev counter, a feed to
the pumps and changing the multiplugs to the
front indicators. or you can pi55 about with carbs
and never get it right.

Thanks for the vote of confidence. :/ You got shares in EFI or something? As I said, fuel injection is not on the options list. I need carb advice, not a lecture for not doing what everyone else would do.

So once again, would a weber fit a similar pier burg manifold bolt pattern?

[mikeymk]

Use carbs from a Honda CBR600F-X model year '99-'01, no earlier, and drill the main jet in each carb to 1.4mm. Use a simple top hat flange on each port and some wire reinforced industrial vac tubing. Cut the ball off the throttle cable but leave the crimped part on, this then pulls the throttle pulley once you've modified the Polo throttle bracket and fixed it to the side of the end carb.

This will give you both maximum power and yet maximum mpg, with no worries come the MoT. These ultra efficient carbs from Honda's finest range of sports vehicles only 11 years ago are not to be confused with car carbs, which had run out of development a quarter century ago. They are self-regulating, so they only supply the engine with the fuel it can burn.

I ran that engine on those carbs precisely like that, so i know this all by a great personal experience. Here are three pics of my car as it was in that state, followed by various other pics of other engines i've ran them with, and some indication of how.
A single downdraught carb into a 4-1 manifold is horribly flawed by design, causing cylinder snatch, you'll never get it as clean running as individual throttles. These are all i'll use, i've been using them for several years, so can't help with any other type of carburration. It's another option, anyway.




Carbs after i'd modified them with a vac out, not essential because it'll be fine without vac, and you can take it from the manifold runners or rubbers if you do run it..

Worked superbly on the 1.6 too, they required further modifying obviously
Good shot of the flanges on the 16v, but the ports were the wrong shape so i converted to a steel manifold.


Making a manifold for the 16v ports..


And on the current engine..


Only thing i'd suggest, if you're intent on keeping with one big inefficient carb, is to keep it small - the Polo inlet manifold is highly restrictive in it's bore size even for the 1.3 engines. So unless you want to pay a fortune for a manifold from a GK engine we didn't get in the UK then you're playing with blocked nostrils anyway. Although any donor car with 1.3-1.4 engine is gonna be at least 20 years old anyway, so you might as well use a Polo/Golf/Jetta Pierburg 2E.

[mikeymk]

Note the carbs on the manifold are different, this is because they were bigger ones from a CBR900RR. These have since been modified to side-pull. The last engine now has the VVT in operation.

It's all irrelevant in your case, the first three pictures are all you need. The flanges look expensive but they were just brass water fittings with the threads cut off and a few bit's shaved and grooved here and there on a lathe.

I share your reluctance to go EFi, whether for the same reason or not. Good luck with it, whatever you choose to do.

[bigjohn]

mikey, what did you do for the fuelling and ignition?