TheSamba.com :: View topic - Engine & Distributor & Carburetor combo 1300cc twin

Tue Feb 19, 2008 9:53 pm

Hi to all, this site is great.

I have the folwoing query regarding my engine, distributor & carburetor combo on my bug and whether these are correct and suit the car for best operation.

Details as follows;

Engine Code Stock AB 430470 1300cc twin-port,

Distrubutor Code 113 905 205AL.

Carburetor Solex 31 PICT3.

Whilst checking the distributor codes in the forum I have found out that 113 905 205AL is used for a 1600cc 1970 Auto stick shift with timing set at 0 deg TDC.

Does this distributor work fine with the engine -carburetor combination?

I have experienced no flat-spots, smooth acceleration, no rough idling.

Thanks in advance for your help

Wed Feb 20, 2008 8:03 am

Welcome to The Samba!

I'd like to help you out with that question, but here in the USA we never got the 1300DP (twin port) engine nor the 31PICT-3 carburetor. Those were non-USA-only items. So we don't know a lot about them. However, I've messed with a 31PICT-3 carb before so I'll take a stab at it.

I'm pretty sure though that your 31PICT-3 was set up for either a SVDA or a DVDA distributor. Probably DVDA. Often, those types of carbs can be quite sensitive to carb/distributor mismatches. But sometimes you get lucky (I ran a vac-only distributor on my baja with a 34PICT-3 carb for many years without much problem) So, as long as you time it at TDC statically,as is proper for that vacuum-only-advance distributor, and if you are not having drivability issues with it, I'd say call it good and enjoy the ride.

FYI - A good site for European models like yours, you might try Volkszone Forums. It's kind of a British version of TheSamba.

http://www.volkszone.com/VZi/forumdisplay.php?f=11

-Andy

Wed Feb 20, 2008 8:21 am

Resto,

You don't mention what year your Beetle is. The '66's had the 1300cc engines, and were not twin port, but rather single port. Are you absolutely sure of your displacement and whether this engine is twin (dual) port or single port? You may want to ask these questions on the later model Beetle forum. Sounds to me that you have a later model Beetle engine in there that may have at one point in time been in an automatic Beetle, based on the carb model and dizzy#. Are you sure your carb is a 30PICT-3 or is it a 30-31 aftermarket? The '69's with auto trans used a 30PICT-2, don't know about the '70's. They may have gone with the 30PICT-3 that year. And, the engine displacement would have been 1500cc, and still retaining the single port configuration.
So, I personally am not sure of what you have in what year Beetle. But, you say that the engine's running fine and there are no major problems. An easy diagnosis is pull your plugs and see what they look like. If it's running ok, be happy with it. If you want to make sure everything matches part# and year#, give us more clues.

Wed Feb 20, 2008 8:24 am

Well, Andy beat me to it. I didn't realize that you're in Malta and may have a European engine in it. :oops:

Wed Feb 20, 2008 12:59 pm

Thanks all for your prompt replies and precious help!

You rightly said, I have not given ay information regarding the vw model, but its basically a 63 type 1 deluxe.

Its orginal motor has seized up and no 1200cc parts where available in Malta so I had bought a reconditioned engine brought over from the uk! Regarding its fittings i.e carb and dizzy those where the set-ups which came with the bug engine.

For sure the engine is a european twin port 1300c as once I removed the heads and measured up the bore.

The carburator is for sure stock as I have another carb a 31 PICT-3 from a 1500cc H code engine that came from a euro 67 type 1 and its practically the same. I try to use good stock vw items and no repros.

Plugs are okay they are not fouled black with fuel, the normal deposits of a good stoichiometric air/fuel mixture.

Thanks again!

Wed Feb 20, 2008 7:26 pm

restocal63 wrote:
The carburator is for sure stock as I have another carb a 31 PICT-3 from a 1500cc H code engine that came from a euro 67 type 1 and its practically the same. I try to use good stock vw items and no repros.

Since you seem to have a working combination, don't mess with success!

Now, that 31PICT-3 on the '67 1500 H engine was not correct. It would have been a 30PICT-1 originally. The 31 series carbs were designed for twin-port applications and came out in 1971. The H would have been a 30 series carb. What are the base flange numbers on your carbs? Every time VW would issue a variant of a carb they'd change that base flange (modification state) number, and while the carb might look the same externally, internally the location of drillings, the size of the hole in the throttle butterfly, might be different.

Last year I came across a 31PICT-3 carb which I played around with. I found it had some HUGE main and air correction jets:

I inquired about the size of those jets on the Vzi forum and the tech guru there sent me a scan of a page full of specs of different 31 series carbs. It didn't have the base flange # of my carb listed but it had one that was just one number off from it, and my jets matched. So I tried it - along with a SVDA on my "1400" 40HP engine. It ran, but not that great. I probably could have gotten it to run better had I kept rejetting it. But I don't have many spare jets in non-stock sizes - I tried a 135 main but that was about it, so I just went back to my 30PICT-1 and 40HP distributor.

Since I had some numbers for a couple years of 31PICT carbs, although I didn't have any info on which distributors they would have been mated with, I added them to the chart of carbs I've been compiling from various sources for a while now:

http://members.aol.com/glutamodo/VW/UprightBaseFlangeNumbers70-74.jpg

http://members.aol.com/glutamodo/VW/UprightBaseFlangeNumbers63-69.jpg

Wed Feb 20, 2008 10:04 pm

Andy,

Thanks alot for your reply, whilst I must say I am always amazed by your answers as you give such technical data which is simply fantastitic, likw your empi carburetor sticky; pretty good stuff :D .

Over the weekend. I'll check the base flange numbers on my carbs and jet sizes and will let you know.

Regarding the origins of the 31PICT-3 series carb on the 1500, it could be that the PO has changed at some point as it is a Euro model (4lug wheels front disc brakes etc, sloping headlights, different from US 67), and most probably when changing from 6V to 12V swapped carbs to have a matching 12V automatic choke and idle shut off valve.

As you rightly said since the 31PICT-3 carb is from the 1971 from 12v cars, I think it was a common practice in Malta to chande to that, but this still works fine on this H engine too. This is coupled however to a 113 905 205K stock dizzy.

Once again thanks for your help and for the lists!

Thu Feb 21, 2008 11:01 am

I have checked the carbs out and found the following;

Engine/Code Carb Main Jet Air Correction Jet

1300 tp AB Solex 31PICT-3 135 170

1500 H Solex 31PICT-3 130 170

Do not know whether these make sense and are correct but they work fine on both cars, however 1300 engine seems to be more agressive and yields a better acceleration than the 1500 one. Consumption is the same around 27mpg each.

Where is the base flange puched/marked out? Did not manage to see them :oops:

Thanks

Thu Feb 21, 2008 11:24 am

Well, the DP engine breathes more so a larger main jet is probably to be expected.

The base flange number, right by the throttle cable connection. Should look like the picture I had above of. Or like these:

Thu Feb 21, 2008 11:51 am

Thanks for your help.

Just checked the numbers and are as follows.

VW 282-4 for the 1500 engine with the 133 905 205K distributor with 130 main jet and 170 air correction jet.

VW 360-2 for the 1300 engine with the 133 905 205AL distributor with 135 main jet and 170 air correction jet.

Hope that with data you could add some information to your list.

So you suggest I leave the items as they are since they are running okay.

One last query.

It seems that on my 63 bug 1300DP I feel that my stock exhaust is hindering the engine from letting the maximum power output to be achieved and often gives me the impression that its getting clogged since the car is not used daily but maybe only 10 times a year, for meetings with some other vw friends & enthusiasts weather depending.

How can I check if the exhaust is causing some kind of back pressure on the engine itself?

Once again thanks!