how to set timing - mallory mechanical advance on '74 1.8 Options

[h16]

I need to set ignition timing on a '74 1.8 that has a mallory dual-points mech adv distributor. Model # of mallory distrib is 2354101, in case it matters to someone.

Anybody have tips on how to set timing on this setup, assuming the rest of the engine is basically stock?

Prior to any attempts to set timing, I plan to replace both sets of points, condenser, and adjust the dwell.

Thanks in advance for any help

[cgnj]

A couple of questions:

if I use the 16 degree key, then that will make my total advance be 16 degrees plus whatever advance I set at idle?

Yes in this example 12 initial timing + 16 advance = 28 degrees total advance

My T4 engine is set at 8 degrees and is programed for 20 degrees advance, so 8 + 20 = 28 total advance.
Mine is a crankfire ignition, but I've also done this with a Mallory using the 20 key.

To me 12 degrees initial advance is too much, I aim for 8 degrees and 900rpm idle. 10 is about the most I ever use.

I agree with Mark, because he is smarter than me, but also because I read the advance curve documentation that came with the Unilite.
Unilite grey/grey springs If you look @ this drawing you can see the slope of the curve is quite linear and comes on below 900 rm. Made sense to me to use less initial advance and key to 28 total.


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