Quote: i still have an little issue with setting the idle speed with gear engaged (D,R,2,1)
my problem: i can´t get the RPM above 480-500 RPM it´s okay, but it´s a bit shaky then
Idle speed is set with the transmission in neutral or park. Not in any other gear.
Quote: current status:
ignition: 24° BTDC
That is far too advanced. A much more reasonable setting for a street driven car is 8-12 BTDC.
Quote: cold idle after starting - choke fully closed 800-1000 climbs up fast to 1500 -1800 RPM (depends on temperature) after first touch of the pedal it drops to 900-1000 RPM
Those RPMs sound a touch high. Fast idle is set by warming the engine up fully, placing the fast idle speed screw on the second highest step of the fast idle cam, and using the fast idle speed screw to set the fast idle to about 1200 RPM.
Quote: idle when warmed up and choke fully opened 750 RPM vacuum reads 19 inch HG
That sounds about right.
Quote: when putting the lever in gear it drops to 480-500 RPM, vacuum drops to 15 inch HG
That idle speed sounds a touch low, but it sounds like you have other issues such as timing and idle mixture, so that idle speed may change after to you do some adjustments.
Quote: idle screws are backed out 3,5 times, screwing them in a full turn will let the vacumm drop about 1- 1,5 inches and RPM will also drop to 420 - 450 RPM turning them out more doesn´t have an effect on vacuum or RPM
my former experience (with 4 BBL Holleys) was: idle screw adjustment is somewhat about 0,5 -1,5 turns
if i try 1,5 turns on that Carter the engine will not start
The general consensus is when setting the idle mixture you start with the engine fully warmed up, the timing set correctly, the vacuum advance hose disconnected from the distributor and plugged, the curb idle speed set to 700-750 RPM, and the idle mixture screws set to about two turns out from lightly seated.
The first thing you need to do is to get your base timing sorted out. You need to verify that the timing mark on the vibration damper is still accurately indicating top dead center on the compression stroke of cylinder number 1. The outer ring on the damper can slip and give an inaccurate reading. Once you are sure your base timing is set correctly to a more reasonable 8-12 degrees BTDC, then you can start dealing with the carburetor settings.
First, are you sure you have a Carter BBD designed for a slant six? There are differences between the 318 BBD and the 225 BBD. One of the more noticeable is the presence of holes in the throttle plates on the 318 BBDs that affect idle mixture. People have reported mixed results using a 318 BBD on a 225, but that is a factor you must consider.
Second, you may have the idle speed screw turned too far in to compensate for grossly incorrect timing. If the idle speed screw is turned too far in the carburetor may be running on the transfer and/or main metering circuits rather than just the idle circuit. When setting the curb idle speed and mixture the carb must be operating on the idle circuit only.
Can you post some pictures of your carburetor? Specifically the PCV hose fitting and a closeup of the idle speed and fast idle screws so we can see where they are set at hot idle?
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