Pierburg carb trouble please help

I am having trouble with the pierburg carb in my 1.6 mk1. Hope fully somebody can first help me identify and diagnose my problem.

How can I identify the carb, where would the markings be on the carb its self?

My problem is when first started from cold it revs really high got to 3000 today, it then stays there might drop to 2000. After the drive to work car is parked probably til 1PM and when started then it's a bit better at 1500 but gets to 2000. This has started recently over last couple of weeks.
I do want to try and keep this original setup and repair/resolve the issue, I have been researching it on the net butsurely somebody must still have some knowledge of peirburg's and want to pass it on.

I hop some one out there can help me in someway appreciate all the responses that may help in anyway.

On a small note if anyone can recommend any tuners in the Rotherham (South Yorkshire) I would appreciate it cheers.

Many thanks in advance for all those that read this and give any advice
 

Hi chap. nice to see someone with identical engine as with my Mk1 1.6 Cabrio. I dont know where to start to sort your problem out, but i do know some of the causes why the dreaded pierburg fails. What you need is one of these.
http://i31.photobucket.com/albums/c357/satelliteone/DSCN0106.jpg

That is now on my 1.6 a wber 32/34. bought it from ebay with the mounting plate, the doofer on the top so that the original air box can be used. Mind you it did cost over 100 quid, but its like new. All jetted as well for the 1.6 motor. Just a couple of hours to fit. The pierburg went in the bin.

I have some stuff saved for when i had mine, and like you was tring to get the pierburg working well, to avail, that is why i went over the weber.

 

Looking at that diagram you've highligthed a part of the inlet manifold in blue part 32. is that some sort of blanking plate to fit the Mk2 inlt manifold to the mark 1 head? If so I need one!v I've got a 1.6 Scirocco enginein my Mk1 cabrio but with a 1.5 inlet and solex 1B3 carb. I've got the manifold and weber 32/34DMTL to go on but this water cooling inlet is stopping me.

hi karman, The diag was done for a m8 back along, who was doing the same conversion as me.

The conversion was to loose the 1.6 cylinder head. Reason why? cause it was a solid lifter head. I found that to adjust the lifters was to place different size disks. Speacial tools and all that. Looked at getting it done in garage and no one wanted to do it..SO! dam costly too!

I had a brain storm. why not fit a differnt head from a 1.8GTI. Its got Hydrolic lifters that adjusts itself. Sorted! say from a 1990 Mk2 golf GTi. Digipants!

Ahhh the problem was! the water heating. On the Carb heads, between cylinder 3/4 on the intake side was an outlet from the head, for hot water into the intake manifold. The GTI head has not got this. its blanked off, as the GTI has not got any water heating in the GTI manifold at all.


As you can see from the picture the hotwater outlet from the intake manifold goes to the Pireburg choke system, then back to water system which feeds the heater matrix.

So blocking this, not really needed, with the weber carb, due to a manual choke. Also VW`s idea was to keep the manifold warm on really cold days, just for better fuel atomisation. Ideal for below 5C in the russian outback. lol. Also VW fitted a Hedgehog.. which is the little doofer that fits under the manifold. Electricly heats up alloy fins in side the manifold. Another heating system.

As the manifold is made of alloy it heats up quick in anycase, this pic was to show the path of the water. Not really needed at all.

Another thing i have noticed on the big block carb engines the heaters took longer to warm up, than the the GTi`s. The reason, cause most of the hot water from the head was diverted into the intake manifold, unlike the GTI head, thrown out the side straight into the heater matix system. So less hot water to the heater.

The 8V GTI head was the way to go. The carb manifold bolts straight up to the head, as with the exhaust manifold. so no problems there. Also an added bonus of the GTi CAM installed. With no tapping tap tap unlike the solid lifter head.

Ive done the conversion,with a weber 32/34, and ported the head. 75HP to around 100HP. Ideal!
Best thing ive done to my Cabrio!

hope it clears up some stuff for you. Dont matter what block you have, as long its the big block type you can fit a GTI head on it. Using the new bolts, same type head gasket ,GTI one fits. Thank god VW made things well simple. Unlike a Honda civic im doing at the mo..

PS.. the thing number 32 gets blocked up with gunge on some cars, then the pierburg does`nt get hot water for the choke system. The waxstat and choke fails. High reving and all sorts.Its a rubber grommet type thingy to seal around the entrance.

Best regards
Andy

Many thanks for that Andy. That sorts out my winter project now my cabrio is sorn'd. Now looking for a new head!

Any ideas which engine code head is best- PB KR others? What should I look out for? I'd imagine a low mileage Mk2 Gti 8v is hard to come by!

Yup that what i was doing way back earlier in the year. I found a PB head on ebay. Cost me 40 quid. didnt get a cam with it, so i had to look for one of them too. And bought new hydo lifters.. Cost me 100 quid, with the gasket set. If you can find a complete head cheap your on a winner.




If your going to fit a carb manifold to the injection head, i know what your going to ask. How to i block up the injection holes?

Easy peasy lemon sqeezy. Use 1p coins inserted in the holes, they are a perfect fit. Some liquid metal on top, perfect.



Some PB heads, not all,  that were fitted had an air shroud. A small air pipe that fed back to the inlet manifold. Somthing to do with leaning mixture on all of the injectors. another idea VW had.



Just chop it off and seal up the hole, again with liquid metal. job done.

All you have to do now is bolt up the inlet manifold, bolt down the carb and your away. Ideal mods for a winter project. only if i had a decent garage… i modding my gearbox.  

I was thinking, on a 1.6 carb or even a 1.5 carb. the gain of a GTI head would be around 10-15HP maybe more. The PB head has bigger valves too. breathes better and keeping the combustion chamber the same size so compression is not effected..really ideal.

Ive been running my ported PB head on my 1.6 block for ages. I get power surging at 4K and not ending to 6.2K.. which before it was blowing out at 5.5K.

Just to put this in perspective. My original 75HP solid lifter head 1.6 motor was`nt really any good for power. Now i can just keep up with a 1.8GTI golf MK2, thats a 112hp engine. I can accel faster than a hyundai accent 1.6 16V 100HP. its a cheap mod that works well.

The other idea i was looking at, was changing the crank and pistons/rods.out of a 1.8GTI. The 1.6 block has the same bore. just that the crank/pistons and rods are different. I would change it to a 1.8 cheaply. Might have to home out the bores tho and stick in a new set of shell bearings, now the cost is rising. but still, it worth thinking about.

Any how karman winter projects are fun… hope it helps..

You must have a crystal ball. I was sat here last night thinking- hang on what about the injectors! Thanks for all your help. By the way my engine is a 1.6 GT Scirocco which I'm told is 85HP as standard (FR code), so should be fun with a PB head on!

you lucky git!… yup nice engine..rocking horse poo. My m8 years back has one of them engines in a MK1 rocco, went like hell standard, Let alone with a bigger port PB head bolted down on it. I rekon if that was ported and a 4 2 1 exhaust manifold, weber 32/34 and a nice exhuast, that would go past a GTI. I would expect a good 110+HP.
I think the compression ratio was higher on them engines, 9-5-1 or may be 10-1, needs looking up, but a well nice find in anycase.

And the best thing about that is, its a 1.6L still..group 10(cabrio) not group 15 unlike the GTI(cabrio)..hehehehe…

any more of them blocks lying around?..lol

It was in the car when I bought it last year. I bought the car as a standard 1.5GL cabrio but things didn't seem right with the engine and it started burning its points out. Turns out its got this 1.6 FR engine from a rocco but the ignition was wired up all wrong, with the wrong coil. Replaced the coil and a few bits and it does seem better but still hasn't got a ballast resistor in to drop the volts after ignition so thats the next job, or maybe get a Lumenition kit on it.

points, hell.. yup that the older engine. I wonder if the TCI electronic system would fit on that engine. Just as a mod. if a TCI style dizzy fits in the block and you fit the bit that goes in the rain catch tray thingy (TCI unit) wire it all up and way ya go… all you would need is a donar car for bits. My engine has that system. it looks pretty straight forward.  The wiring might be a liittle too much for some. but its worth a thought.

Looking at some screw holes on the bulkhead and wires it appears the TCI was taken off and it was converted to points. I think the previous owner had a few problems wiring it up. Not suprising considering his idea of connections was to twist two wires together- he didn't even bother to put insualtion tape on them!