Am I Over Carbed?, Dual Weber 40 IDFs on 1.7 Options

[rhodyguy]

if you haven't done so, order or go to a vw parts store and buy one of these. then, everything we tell you will make sense and you'll know what we're talking about. i think they are cheaper from amazon than cb performance.

[maf914]

Along with the Tomlison Webber Manual above, you might try the following three from Amazon or AbeBooks.

[Mike Bellis]

I have been trying to drive my car comfortably but I am running across issues. Mainly after the car warms up it starts acting weird.

Coming to a stop and revs dropping. it just dies. Then I have to wait a minute or two to get started again. Then it runs a little rough, pops, backfires.

Just did the valves, points, timing but runs like crap when hot.

The engine is a 1.7 block with 1.7 heads and dual 40s. I don;t know if there was any work done internally but the block is a 71 and car is a 70.

It has been suggested that I am way overcarbed and running rich. i have no plans of building out this motor to match the carburation.

Am I better off selling off this dual weber set and putting on a single Weber 32/36?

I have my eye on this: http://www.ebay.com/itm/310953732343?ssPag...984.m1423.l2649

I am thinking the weber and hex setup should be worth around $450?

What say you?

If you buy that single webber, you will be kicking yourself in the ass until you buy another pair of 40's. The single webber will run like shit.

[7TPorsh]

I haven't had a chance to look at the jets yet. I do know they are clean since I cleaned them all and the tubes a few months ago.

The number 12 sticks in my head...jet size?

Assuming all is setup near correct, what adjustments should I be looking at? Float level sounds like it may be an issue. Idle mixture?

These books are great I am sure but honestly don't have the money and patience to go that route. Just want to get the car running somewhat smoothly.

[rhodyguy]

the tomlinson book is $20. stating 'idle mixture" can refer to (1) idle jet sizing, (2) plugged idle jets, (3) idle air mixture screws…the trouble shooting guide is helpful to say the least. you will save yourself countless hours knowing precisely what is being referred to in the responses. much more direct rather than 'try this and then try that' which will get you nowhere and frustrated.

[ThePaintedMan]

Gary,
Kevin and Stu have given you great tools to point you in the right direction. It's completely understandable to be frustrated with carbs - we've all been there. But keep in mind, this is a very simple system and can be fixed, but only with the proper understanding/knowledge. Part of that knowledge can be easily gained through the Tomlinson book. It's $20 that is well spent and you can always resell if it you don't use it again (which I highly doubt).

The rest is basically effort on your part. We're here to help. You need to get the jet sizes by pulling at minimum, one main jet and one idle jet. Otherwise we're just wandering around in the dark. The 28 mm venturis are a decent match, so the hard part is done.

[rhodyguy]

george has travel the path you're on. to the point where provides a rebuild service. in addition, examine your JETS (all of them) one carb at a time and note what you have. it's not all that uncommon to have different sized jets on different carbs trying to cure some ill. you still need to know what jet does what and when.

[AE354803]

Am I the only one that is impressed by how clear that picture of the venturi inside the carb came out?

Writeup on carb rebuild is linked below, should give you a better understanding of what you're working with, all credit to George for the good writeup

http://www.914world.com/bbs2/index.php?sho...l=weber+rebuild