1969 chrysler 105 timing advance going overcenter?

[Bobbywolf]

I am trying to set up the timing on my 69 105hp chrysler, but something odd happens at wot.

At idle the #1 cyl is at tdc, with the 0 mark on the flywheel lining up with the +1 on the indicator tab. (Idle adjust screw on the tower is adjusted all the way out and +1 is the best I can get for some reason.) As the throttle tower is moved toward wot, the timing advances as expected, but just before wot the linkage attaching to the distributer goes overcenter and timing retards as a result. Is this normal behaviour?

Right now I have the linkage set so that timing is at 32 BTDC at WOT using a multimeter on the points to judge opening. However, as it is set, timing climbs to 35 BTDC before settling to 32 at WOT.

The points were set to a 0.010" gap when open, as per the clymer manual. The distributer linkage ends up measuring 0.550 between the blocks.

Am I missing something obvious here?

Rob

 

[Nordin]

This is normal behavior at Chryslers.
I have something in my mind (but I can not prove from where I have read it right now) all larger Chryslers from 35Hp and up has this behavior.

I will check in my manuals and where I have read it and what the purpose is. I think it is something they called "fuelsaver range" as it retard the timing but not the throttle.

 

[Bobbywolf]

A little googling of "Chrysler outboard fuelsaver" shows this to be indeed the case, good to know. I wish they at least mentioned it in the clymer manual lol. I'm going to reset my WOT timing to 30 BTDC after a bit of searching shows that timing generally advances another 2 degrees when running, over static, and go from there.

Trying to resurrect a poorly maintained, poorly adjusted motor from the brink.

Rob.