Solex 31 pict 3 on 1600 SP

[maggiolo72]

Hi there, someone has experience using a Solex 31 Pict 3 on a 1600 SP.
There is some jetting work to do ?
The car ir running good but seems to be quite rich on carburation.
Any guess ?

I have
Main jet 130
Air corr. Jet110z
Pilot Jet 52.5

[73type2]

Before touching the carb, have you done the standard checks, i.e., ignition timing, points, valve clearances, no vacuum leaks? If any of those are not right you will have a hard time setting your carb.

[maggiolo72]

Hi, yes thank you, all these check are ok.
The car idle very well, and runs well but seems to be rich in the first 2000 rpm

[Tony Z]

if its rich up to 2000rpm, then get a smaller idle (pilot) jet, maybe a 50.

[73type2]

Have a look here for a table of jets combinations for most VW aircooled carbs:

viewtopic.php?f=8&t=37786

[fig]

And before messing with jets first set the idle mixture properly.

[maggiolo72]

The car have a rock solid 850 rpm idle.
The problems is that when i drive and keep 1500 rpm steady the car sputtering and is not going well.

[Tony Z]

rich is when it looses power and feels lazy
lean is when it "pops and farts"

have you checked for vacuum leaks?

[maggiolo72]

So can be lean...
Also according to this website.

http://www.vw-resource.com/jets.html#pilot

[maggiolo72]

This is the picture of the spark plugs.
Seems to be lean

[Tony Z]

read the following article and then go through the other articles on their web page. Lots of good info

https://www.dragstuff.com/techarticles/ ... plugs.html

[calooker]

130 Main is way too big for a 1600 Single Port, you will be better off with a 125 main and 52.5 idle.
BTW I don't trust the markings on jets, most of them have been around for 40+ years, every man and his dog has fiddled and in many cases opened them up, I only trust them when I have put a gauge to measure proper.

[maggiolo72]

But the idle is 52.5 right now and the car seems to be really lean.
Maybe I can put an idle 55 and a main jet 125.
Anyway I was thinking of taking the originals spark plugs, even if I'm not sure which ones.
On the engine manual (is a single 1600 coming from a motor pump) give the Bosch W145T, reading around advise all the W8AC are equivalent?
Or do I have to mount the latter since the carburettor and ignition cams are in the road version at the end?

[maggiolo72]

read the following article and then go through the other articles on their web page. Lots of good info

https://www.dragstuff.com/techarticles/ ... plugs.html

Thnk you so much...
So according to the article the car seems torunning Rich ( because of the dark colour of the colour of the "Plug's Base-Ring")

[calooker]

You got the wrong plugs.