(Login danford1) Member from IP address 184.108.40.206
I have 1000 miles on this since the last time I posted.
That 1000 miles was split between daily driving and taking a 412 road trip.
It was NOT a trouble free 1000 miles...
I was and still am making adjustments and trying things.
I found that when the engine is warmed up the stalling in gear appears.
Adjusting the carbs (all 3 are back on and functioning)idle screws leaner will prevent the stalling when put in gear. This causes other issues though. If adjusted so it doesn't stall when warm, then when started the next morning causes it to surge at idle like a supercharged drag car. It will idle even though it is surging. Once warm it is OK again.
I have tried all combinations of carb settings. The best is when the outer two carbs have the mixtures screws all the way in closing off the fuel flow at idle.
The center carb provides all fuel flow at idle and ap to half throttle when the outer two carbs open up.
The center carb idle mixture screw is out so far it is ready to fall out. it needs to be richer, but can't go richer. if I open the end carb screws even a little, the stalling in gear returns.
With the end carb screws in, the air circuits in them still provide air to pass through them leaning out the center carbs mixture.
I could try to block off those air passages in the outer carbs but on the other hand, I don't want to mess with things. It runs good other than the surge as the engine warms up. The idle speed in park is high due to the lean mixture but is drivable as is. The Power Tour is this week. As the car is now and if it remained running as it is, It would make the trip. If I start to change things I could be in for a Hell week getting it back to running if something gets messed up.
I have been adjusting timing everywhere from 0 BTDC and 30 BTDC. I tried manifold vacuum and ported vacuum for the distributor. It runs best on manifold vacuum and a lot of timing. It is probably about 20-22 BTDC at idle now. Full advance is over 40 degrees but I don't hear ANY knock or pinging.
Could it be a silent knock or ping? I mean could it have pre-ignition and not be heard?
I'm concerned that I never heard knocking. I use standard 87 pump gas. It has 8.5:1 compression (I cc'd the head, head gasket and cylinder with piston at TDC, then did the math). The 6 cyl forum guys say not to run over 34 total advance. The engine doesn't run as good with that little advance.
What would you do? Total trip should be 3000 - 3500 miles under who knows what road and weather conditions....