123 Distributor / Setting timing Options

[rjames]

For those that have a 123 Distributor, I need some help setting my timing. I'm probably over thinking all of this but I've read several different threads on setting the timing with this distributor and I have interpreted them all differently.

I'm running a stock 2.0 w/ DJet.
The 123 distributor setting I'm using is 'B' (negative advance), and has a max advance of 22 @ 2700 RPM.

With my new-school timing light that allows me to set the advance, (with vacuum line from the tb plugged) do I:

- Set timing light to 27 advance and rev to 3500 RPM and time to the TDC mark?
- Set timing light to 0 advance and rev to 3500 RPM and time to 27 degree mark (same as above, right?)
- Set timing light to 22 advance and rev to 2700 RPM and time to TDC mark?
- Something else? (IMG:style_emoticons/default/rolleyes.gif)

I feel like an idiot asking this question. Timing is such a basic thing and I had no problem with the stock distributor and an old school timing light, but I've read more than one thread on how to time with the 123 distributor, plus I've also read that there's 10 degrees advance added at static on these distributors.
Help!

[DRPHIL914]

For those that have a 123 Distributor, I need some help setting my timing. I'm probably over thinking all of this but I've read several different threads on setting the timing with this distributor and I have interpreted them all differently.

I'm running a stock 2.0 w/ DJet.
The 123 distributor setting I'm using is 'B' (negative advance), and has a max advance of 22 @ 2700 RPM.

With my new-school timing light that allows me to set the advance, (with vacuum line from the tb plugged) do I:

- Set timing light to 27 advance and rev to 3500 RPM and time to the TDC mark?
- Set timing light to 0 advance and rev to 3500 RPM and time to 27 degree mark (same as above, right?)
- Set timing light to 22 advance and rev to 2700 RPM and time to TDC mark?
- Set timing light to 22 advance and rev to 3500 RPM and time to 27 degree mark? (this doesn't seem right, but it's what one thread said to do)?
- Something else? (IMG:style_emoticons/default/rolleyes.gif)



I feel like an idiot asking this question. Timing is such a basic thing and I had no problem with the stock distributor and an old school timing light, but I've read more than one thread on how to time with the 123 distributor, plus I've also read that there's 10 degrees advance added at static on these distributors.
Help!

i think all your questions will be answered in this thread: http://www.914world.com/bbs2/index.php?sho...8153&st=120

i just went back over mine due to idle being just a bit higher than i wanted it to be. did this yesterday, it’s a ‘75 D-jet stock everything . and like you i have it set on B. the carb guys don’t use the vac same and use that 1 or 2 setting with positive, but almost everybody here that’s running d-jet and use the negative vac(retard) #B, timing is set same as the manual says to, at 3500rpm, so that if your fan is marked at the 0, use the light and get it set to 27degrees before tdc - thst is with no vac line hooked up, all hoses plugged but vac on the distributor is open. the. once this is done your idle will be high but as you hook up that vac line (retard) to the distributor it should pull it down to 900-1000.
now this all assumes your valves have been set and the CHT is correc you have no vac leeks and the mps is tuned correctly.

ok, now i just went back to recheck mine too and i have my idle one warm end up good, is about 1100. it’s a bit higher than i’d like and i can adjust the idle mix on the ecu and drop it about 100 or play with the MPS but i like where all my AF readings are so i am not doing that, it has more to do with the CHT i think, because idle cold is good, then slightly warmed up as the aux idle air valve closes it slows a bit too much but within 1-2 minutes it’s right at that 1050-1100 and stays right there . could be the resistance of my cht as it warms up is not correct, but gets there, and i suspect that because of it sits when i run in the store, come out , due to that heat sink effect the isled is slow for about 60-90 seconds before it comes back up to normal.
i’d like to get the idle at 900, but if i make adjustments to do that the heat sink issue is way worse ,

so i will say that with the 123ignition and a new clean tps the car has never run better.
read thru that other thread, let us know how it tunes up.

Phil
@rjames