Ideal PMO/Weber settings for 2.2S?

[jameshurst71t]

Hi folks, I have 2.2T rebuilt with 2.2S Ps and Cs. I’m looking for ideal setup for PMO 40MM carbs.

I have hot cams (solex), stock Bosch CDI, stock Bosch dizzy, pertronix, SSI and Dansk 70mm sports single outlet.

I need to buy and test AFR to get a reading. I have a bung in my left SSI.

I had a major cut out when transition happens at 3500 RPM. So I went from F11 to F16 emulsion tubes per PMO website, now subsumed by EMPI. Going to F16 e tubes reduced cut out by 95%.

My currently carb setup is:
40Mm PMO
Main jets .125
Air correction 1.80
F16 emulsion tunes
Idle jets 0.55
32 Venturis

Paul Abbott suggests:
“I think the preferred emulsion tube for PMOs is the F11, so my best guess for your application is:
* 32mm main venturis
* 130 main fuel jets
* F11 emulsion tubes
* 170 main air correction jets
* 55 idle fuel jets
* 110 idle air correction jets (These are tune-able on PMOs.)”


I dynoed 160hp at Turbohoses so I know there’s more juice there for the street.

To sanity check, I’m thinking of measuring AFR with a target of 12-14. I’m going to try Paul’s suggestion.

I want to go back to MSD because I feel in my seat that it had a better burn and more power.

I also think about going to 123Ignition setup.

Swapping out the carbs is not an option. What would you do?

[Nditiz1]

1. Check float levels. Are they all touching the dot with the car running?
2. Get an AFR, otherwise you are just pissing in the wind
3. Listen to Paul, he's very knowledgeable about carbs.
4. 123's are great, 123ignition.usa
5. You are already doing the right things - data gathering - try one size up on the mains as Paul suggested leaving everything else the same, what happens? You have a baseline and know that something happens at 3500, what that is depends on what your AFR says. Make a change, test.

[snbush67]

I think that the linkage balance left to right is off. The linkage needs to be spot on. Cut out during transition could also mean a weak signal for air or fuel, you won’t know until you read the AFR’s. Or go up/down a step in airs and see what happens.

You will get a better spark with MSD. The 123 is great for tuning.