I have read and re-read this thread and many others...GREAT STUFF. Hoping to hear some thought on my particular situation.
OLD: (My 258!) MC2100/China HEI clone.
NEW: 32/36 Kit/DUI distributor.
The 32/36 was installed my a local mechanic - long story. He did some interesting fab work on the linkage in the kit apparently because I did not have the stock throttle set-up with the old MC2100. I tried to snap a few pics (below). From what I can tell the linkage works fine - but looks odd.
I installed a new DUI street/strip distributor curved with 24* at 3000 rpms - from the factory. Had it on "s" port vacuum advance (VA) and it was knocking like MAD at PTC. With the vacuum advance disconnected/plugged - no knock, but not really "peppy." Too much timing was being pulled in creating a lean condition at PTC with my tires/gears/load (as I understand it). Had some issued with the LiveWires fitting. Used a couple of my old wires on #3 and #4. I'll fix this eventually - but it seems to be ok, just ugly.
Switched over to manifold vacuum this morning. The result (as I understand it) is that the initial timing now "includes" part of the vacuum advance that is available from the DUI. The timing is set at 10* BTDC. No knock at PTC that I can notice. Perhaps some knock around 3000 rpm -- I am considering backing down the initial a touch but don't want to loose performance from my new DUI.
At the same time this morning - I attempted to tune the 32/26 according to this thread and others. Backed off the speed screw until it wasn't touching. Backed out the mixture screw 2.5-3 turns. Got it started by fingering the throttle linkage. Turned in the speed screw about 1.5-2 turns....and then back out...I was really was just listening until I couldn't hear air/fuel being sucked through the main circuit -- to get the throttle plate closed (as I understand it). It was BARELY idling. Tach read 400 rpms.
Turned the mixture screw (1/4 turns) in until the idle improved and then started to die. Turned it out about a 1/4 turn. It's idling at 500 rpms.
It seems to run pretty darn well but it STINKS rich - I think. I just know it stinks. The exhaust is putrid and strong - but not wet that I can tell. It was wet with my MC2100 and old HEI. I do have some blow-by and I know it burns some oil, but it's never smelled like this.
My main concern is that I have not fixed the timing/knocking...just covered it up with more fuel?
I have to say that I was doing a lot of "JeepHammer" reading and I realize that he has a different opinion on this issue. He claims the real solution is to limit the vacuum advance with a limiter kit. Problem is, I have a hard time believing that all the guys running DUI/Weber 32/36s with 33s and 3.73 gears have had to go that route. Especially since manifold vacuum (as I understand it) would limit the total vacuum advance under load since it's required to be taken into consideration when setting the initial timing.
I am going to try to re-tune the carb again tomorrow - but would appreciate your thoughts...
Sorry the pics suck. I rigged on an air cleaner to get cooler air. It's not right but I didn't remove it before snapping these on my phone.
You'll see a little piece of red tape over then end of the choke-thingy. There is a vacuum leak there -- I think that it's missing a screw? Or is that supposed to suck air. It doesn't appear to effect performance, but I am probably wrong on that.