TheSamba.com :: View topic - 34 pict-3 jets

Fri Sep 07, 2012 6:37 pm

hi everybody .. i hace an 1600dp , 34pict-3carb , svda distributr ..
ok so i have trouble with the carb before i had a flat spot and low power with a 009distributor .. so they told me to change to svda .. so i did it .. now the engine dosent run as it should .. the mecanic told me to put an 80Z AIR JET.
my main jet is 127.5..

is that correct whut the mecanic told me ?

Fri Sep 07, 2012 7:35 pm

What size air correction jet do you have now?

What kind of issues are you having?

Lastly, is this an aftermarket carburetor or a German one? (and if it's German, what is the modification state number on left side of the base flange? )

-Andy

Sat Sep 08, 2012 8:21 am

34 pict-3 carbs have at least four different size choices.
60z
70z
75z
80z

From what i have researched the 80z is for the ghia and the 75z was for the bug. The others might be for a bus or possibly for the California emissions cars.

Generally the smaller the air jet the richer the mid and higher range.

I have tried all 4 sizes plus drilled one to a 95z for testing on my Bocar 34 pict-3 blow through project with mixed results.

Other Solex carbs have air jets that are larger yet. I have seen a 125z
also.

Don't take for granted the size stamped on the jets. I have a 127.5 that is actually a 130. You would be well advised to pick up a set of metric drils and try sizing your own jets. The drills are cheap.

Here is what I use.

http://www.widgetsupply.com/product/BBL50.html

With the blended fuels they have now days you might need to go up a half or full size to get the engine to run good.
Try a 130 or a 135 and see how it runs then you can always order the correct size after you get it really close if you need a 132.5 or something like that.

Sat Sep 08, 2012 3:53 pm

hi guys ...i have an euromax carb (cinese made) bought it form cip1..

i have a 127.5 main jet .. and today i pull of the air jet.. but there nothing on it .. so i dont know whats the size :s..

my carb isssue is that the carb wont go more then 100km/h .. like the car maximummmm is 110km/h

i change everyuthingggg on the engine new and great quality .. the only thing that i have cheap is the carb..and many people told me that is due to the jets..

so what u guys tell me to do ? how can i drill the jets?

Sat Sep 08, 2012 3:58 pm

okay i saw your link .. but wich drill is to put the air jet to 75z or 80z?
and the main jet to 130 ?

wich drill size do i use?

Sat Sep 08, 2012 4:02 pm

oh and an other question .. for what is the power jet?

Sat Sep 08, 2012 7:46 pm

kevmotocross wrote: oh and an other question .. for what is the power jet?
Don't mess with the power jet........ Don't ask me how I know. :roll:

It is not a power jet but is part of the idle circuit. If you drill it larger you will run pig rich at idle and never get it to run right.
I found out the hard way.... and expensive.

Sat Sep 08, 2012 7:59 pm

kevmotocross wrote: okay i saw your link .. but wich drill is to put the air jet to 75z or 80z?
and the main jet to 130 ?

wich drill size do i use?

Those numbers on the jet translate to metric sizes which is why I gave you the link to the metric drill bits.

They run from 0.30 mm all the way to 2.00 mm

The numbers on the jets reference the hole size in millimeters that they are.
For example.....127.5 is 1.275 millimeters in diameter.
A 130 would therefore be 1.30 mm in diameter.

The carb you have does not have a great reputation for quality but most Solex or Kadron jets should fit them especially the main and the idles. You can order any size you want from a variety of sources if you are serious about tuning the engine.

If I were you I would get a 130 or 135 jet and try them first before messing with anything else. If the engine is not completely stock you are probably running lean and if you have no carb heat all bets are off.
Center mount carbs need manifold heat.

I have found the main jets make a lots bigger changes than do the air/ emulsion tubes in the Solex... at least in a blow through turbo situation.

You will probably notice a change if you would jump from a 60z to an 80z but if you have a 75z and go to the 80z there won't be much difference unless you can log the AFR with an O2 sensor and logging software. Even them you will have to know what to look for due to when the air jet comes on.

Do some research.. there is a lot of info on the Solex 34 pict-3 if you type it in Google or Yahoo.

Sat Sep 08, 2012 8:46 pm

kevmotocross wrote: oh and an other question .. for what is the power jet?

If you mean the Power Fuel Jets... or High Speed Enrichment... then those are as indicated in this image. These are not part of the idle circuit, they only deliver fuel when there is high vacuum present.

Now, the air correction jet, the larger it is, the more air you are going to let into the mixture with the main jet... leaning it out. With a lack of power at high speeds, I don't think a larger air correction jet will help you any.

Sun Sep 09, 2012 2:22 pm

This is the jet I was referencing in the above post that some have called a power jet and I assumed were correct.

Harney called it right when he said it was not a power jet but part of the idle circuit.
I had drilled it trying to get more fuel at full load on my turbo project due to the references "online" that it was a power jet which came on at 4000-5000 rpm.
It caused me no end of problems on my new engine making it run pig rich at idle and not attributing it to that jet due to the "Internet" calling it a power jet.
It has everything to do with the idle circuit and after I redrilled it to the stock size my pig rich condition at idle went away.

Those brass tubes might (and are) the power jet but they get their fuel from somewhere else.

Sun Sep 09, 2012 7:58 pm

Yes, the power fuel system draws directly from the bowl.

I think the term you're looking for that is the Auxiliary Fuel Jet.

Sun Oct 21, 2012 9:07 am

Speaking of Auxillary fuel jets, does anyone have an extra laying around? I recently rebuilt my carb and lost it.