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Insane, at least if not worse

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2 hours ago, Martin said:

The Distributors have different advance Springs and weights. I Plan to take the lightest weight for a first atempt. Megajolt?



Megajolt, or something like it is the best answer (if TUV allows?) but not the easiest or cheapest.

Or is it possible to get this distributor with a version of the 123-Tune inside it?

What shape curve do you want to have?

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123 Dizzy is available, but at a price. 600 Euro. 
So try  and error?  Getting the curve starting  from around 5 degrees at idle. Then 12 .. 15 degrees Up to 4000 , ending  up with 30 degrees above  5000.

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I know the Aldon device. I still have an Accusparc programmable ignition. Runs on Win 7 :ermm: Asked Accuspark already  whether a programm for Win 10 is available. 

Had it for the Mini of my son, but now unused on the shelf.

 Perhaps I will lighten the weights with a drill first

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7 hours ago, Martin said:

Runs on Win 7 :ermm: Asked Accuspark already  whether a programm for Win 10 is available. 

I take it you have tried installing it on your Win10 machine, using the option to run as Win 7? It's a while since I last tried this but I seem to recall it worked for whatever I was doing at the time? Apologies if you are already ahead of me btw!

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  • 3 weeks later...

After playing with various Jets, ignition timing and tweaking with the carbs I have still a lean mixture  between 2500 and 4000 when cruising. But this was no excuse. Today a kind of Track day at the Nürburgring. For 2 hours only Cars, minimum 30 years old on the track. No cruising below 4000 :no:

The car was great. Brake excellent. After some laps a bit sailing over the front. Nankang NS 2r. First time I drove these tyres. No experience so far with the tyre pressure.

It was fun fun fun and fun. :banana:


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  • 2 weeks later...

That lean area between 2000 and 4000 was upsetting me. Thus I thought  some bigger idle jet would be good (27 Euro for 4 ouch). But then I thought and googled a bit. The idle jet does not only cover the idle mixture, but in addition is responsible for the mixture between idle and part throttle operation. There are so called progression holes that enrichen the mixture after slightly touching the throttle. What I had not recognized so far was that there are different sizes of progression holes. 

Two pictures. Weber DCOE in the GT6, which is running perfectly from idle to full throttle.

And from the Polo, with a lean spot / area.


Progress GT6.jpg

Progress Polo small.jpg

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Posted (edited)

The first hole towards the engine is the same in both carbs, appr. 1mm.

In the GT6 then both holes are 1.6mm

In the Polo both are 1mm.

Thus I removed the carbs, drilled the two holes in the Polo with 1.5mm.

Other car. Lambda is now in the tick over / part throttle area between 0,85 and 0,9. Car runs smoothly (taking into account the 316 degrees cam).

Now only too rich at full throttle, but there I have to work on a slightly smaller main jet. The bigger idle jets not needed. 

Fun to drive :)

Edited by Martin
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Smart …..

Dave (the original Mr Sideways) used to get excited about progression holes (more of a thing on Dellortos than Weber’s IIRC). There’s at least one (old!) thread on here on the subject.

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