Carby and jet sizes

27 posts · joined May 2010 · 12 May 2010, 12:19 am

#778095

Hi guys, my first post on this site. I have purchased a 1971 beetle for my daughters 1st car. She insisted!
Well after some time trying to tune the car to not have flat spot on acceleration with no luck, I decided to dig deeper. Well one thing led to another, now I am completing a full rebuild from 1300 to 1600. This is a twin port engine and I would like to get the jetting right for the larger capacity. The carb is a 31pict. What jet sizes should I be looking at, and where can I get them?. Any help would be appreciated.

Bizarre Moderator The artist formerly known as blue74l

12,785 posts · joined Aug 2002 · 12 May 2010, 7:24 am

#778108

Most of the information you want is here

http://www.vw-resource.com/

Most VW shops will have the jets you want, as would Carb Service Company on Parramatta Road Burwood NSW

Tell us where you are so as we can help

Barry

Futue te ipsum!!!

downunderxx Casual Dubber

27 posts · joined May 2010 · 12 May 2010, 9:11 am

#778116

Thanks bizarre. I am down near Ballarat Vic. so anything I need will need to be ordered and sent by post. I guess I should see what size jets are in the carb now before ordering any more.
Another question, do any of you run the thermostat, mine is missing and it's cold down here in winter. I am assuming this would help the bug heat up better in the mornings.

Bizarre Moderator The artist formerly known as blue74l

12,785 posts · joined Aug 2002 · 12 May 2010, 10:59 am

#778125

Dont assume the size is correct
Some one in 40years may have reamed them

Futue te ipsum!!!

hulbyw Insano Dub Head

819 posts · joined Sep 2009 · 12 May 2010, 6:58 pm

#778198

Yes, I run a thermostat and I am in Melbourne, not Ballarat! I bought a replacement years ago from Vintage Veedub (they do mail order) however have no idea whether they still stock them. You will also need the flaps in the fan housing to connect the thermostat to.
Being in Ballarat I also recommend you ensure the heat risers on the exhaust are not blocked otherwise you will definitely experience carby icing when started up first thing in the morning. Good luck with the Beetle. You will learn heaps. The "Idiot" manual (How to KeepYour Volkswagen Alive by John Muir) is a must read for newby's in my opinion.

downunderxx Casual Dubber

27 posts · joined May 2010 · 12 May 2010, 7:19 pm

#778203

Thanks for that info. The flaps in the fan housing are intact, and the heat risers ok. What I am missing is the tinware that goes under the cylinders between the push rod guides. And I need to understand what the thermostat connects to. Will go shopping online and see if I can find a thermostat.
Thanks.

Bizarre Moderator The artist formerly known as blue74l

12,785 posts · joined Aug 2002 · 13 May 2010, 7:26 am

#778304

You may be able to find the bellows but good luck in finding the push rod and holding bracket

This is what you need

It just bolts to the block underneath

Futue te ipsum!!!

jsheppard64 Officially Full-On Dubber

323 posts · joined Mar 2008 · 18 May 2010, 3:09 pm

#779366

just a thought... would it be a bit better to just put a 34 pict in?
ps hurrah to the heat riser... I learned it the hard way

downunderxx Casual Dubber

27 posts · joined May 2010 · 18 May 2010, 6:29 pm

#779410

I don't understand. What is the difference with the 34pict that would help the cooling?

jsheppard64 Officially Full-On Dubber

323 posts · joined Mar 2008 · 25 May 2010, 1:48 am

#780824

it's just little bigger and that you can get them new is all
and most 1600 comes with them

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 · 25 May 2010, 9:06 am

#780854

if you rebuild it as a 1600 just leave the 31pict on it
31s work well on 1600s, theres almost no difference power wise and 31s are alot more user freindly than 34s

and yeah you need heat risers regardless of what climate your in.

downunderxx Casual Dubber

27 posts · joined May 2010 · 25 May 2010, 11:12 am

#780869

Thanks guys. I'LL give the 31 a good look over again, and I have recently put a kit through it, so should be ok.