Mark -
Yes, we had this discussion when I first got the car, and several mentioned this.
I purchased Bob Tomlinson's "Original Weber Tech Manual" - Super Tune-up guide for VW and Porsche engines, and in it, it specifically has a jetting table that says for Dual Carb 44's the jetting is as follows:
"Weber Jetting Guide for Air-Cooled VW Engines"For Dual IDF 44 Carbs:
Engine CC's Venturi Main Jet Main A/C1835-2000cc 36mm 1.55 2.00
2000-2234cc 36mm 1.60 2.00
My venturi's are 36mm, the Main Jets are 1.35, A/C jet is 1.75 - both smaller than the max. This reduction in jetting size makes me wonder if the Porsche dealer didn't have to reduce the jets when they installed the carbs - to get the engine to run well. Their work performance sheet clearly states, "Engine is running well."
The E/Tube, Idle jet and P/Jet are all as per the table.
So, "by the book", it would appear that the jetting is actually acceptable. The book did not mention that these jet settings were only for engines that had been internally modified.
Two other points.
1. When I ordered my rebuilt rear brake calipers from PMB Performance, the tech there asked a lot of questions about my car, as they are 914 rebuild experts. He said the 44's would be fine with the 36mm venturi's and smaller jets.
2. My very good friend in whose modern barn the car was parked for 12 years (an excellent mechanic himself) told me he had a good ride in the car with the owner (another good friend of his) and actually rode into the barn in the car when it was parked. He assured me that the car was running great when it last ran and he was riding in it.
My thought has been since learning of the 44's being over-sized to rebuild the carbs (done) and get the car running and see how it runs - and then deal with the issue from first hand experience.
Many here strongly advised finding the original FI system and installing it - and I did just that. I purchase a system pulled off a member's '76 here.
But PMB Performance told me to not do that. They said that many parts are now impossible to find and putting together a good system today is almost impossible. They used to do that, but don't anymore because of unavailability of parts.
I know you know 1,000 times what I do, and I respect your thinking greatly.
I should have the engine running in a week - working on fuel system now - almost all new/refurbished.....
Thanks for the help, as always.
GN
QUOTE(euro911 @ Apr 16 2019, 01:02 AM)
44s are sort of large for a 2.0L. What's your jetting?