QUOTE(stephenaki @ Feb 18 2013, 10:36 AM)
So, I took the time to work on adjusting the carburetor linkage this afternoon as I believe that this was part of the high idle problem. Bingo! No more high idle.
I adjusted the idle to the recommended 900 rpm then shut her off and used the PP template to find 27 Deg BTDC. I then enlisted the wife's help to check timing. She got her as close to 3200 RPM as possible and kept it as steady as she could and I adjusted the timing to 27 BTDC then locked down the dizzy. I read quite a few threads on the optimal timing for a carbed motor and also looked at the PP article. I think I am between 27 and 30 at 3200 with her running at about 6 BTDC at idle.
Took her out for a spin on the autobahn, much better!
No more backfire at 60 or 80 mph and very smooth acceleration from zero to 60. I think I still need to adjust the shift linkage a bit as 1st is being a bit difficult but I can work that later.
I am having a bit of a challenge balancing the carbs though. I have a synch meter but just can't quite get them to synch up. I am betting I don't have both sides of the carb linkage equally set, I'll tackle that later and measure each linkage to make sure they are sitting at the same length between carb and linkage rod.
I picked up the left rear caliper rebuild kit this morning and had Christoph order me a set of rubber side seals for the targa top. They should be in tomorrow. I just have to focus now on cleaning the car up in preparation for shipment. I'll work that this week after I catch up to things at work. Need to do as much as I can this week as I fly to Africa again on Saturday and will be there for 2 weeks so my time is limited. I currently have the car scheduled to be dropped off for shipment on 20 March. I just have to clean every little speck of dirt I can find in the cab out. I'll tackle the left rear brake rebuild after I get back from my trip.
To sync them, consider removing both drop links from the carbs.
that is the linkage that connects the cross bar arms to the carbs.
With that off, then sync the carbs.
If they are not in sync, consider adjusting your valves again.
Then use the small lower air screw at the bottom side of each venturi (bottom of the carbs, screw with jam nut on it)
This allows you to sync the carbs to each other.
each carb should match front and rear.
Once this is complete, put the linkage back in place and sync each carb to the other carb.
You sometimes need to start at the beginning to gets carbs right.
The motor is an air pump.
All four cylinders, at idle, warm, should pump the same amount of air.
If the carbs are setup properly, at idle, with no linkage, you should be able to measure the same airflow through each carb.
You need that to work first.
Get the car warm with the linkage in place.
Let it idle.
then remove BOTH drop links...they cause friction in some cases.
Then measure the airflow.
If you find a large variation at idle, with no linkage attached...you may have an air leak you need to find.
This could be manifold leak, head to cylinder leak, or a poorly adjusted valve.
All matter.
The drop links on each side will end up different lengths just based upon geometry...and that is fine.
You need idle to be perfect.
From there, the cross bar linkage is a compromise that will never be perfect across the whole range of motion..
The best setup I have seen to date (I have tried most of them) is the cable system that Chris Foley manufactures and sells.
It is super accurate, and its simple to adjust.
rich