A different Thunderbolt IV question.....

[gcarter]

I just received a dual Mercruiser Thunderbolt IV ignition system that apparently came from a Navy Seal boat.
I probably won't use it in this form, but bought it as a source for components for my "88 Donzi 22C Testa Rossa project boat.
The markings on the two modules say 5G14A V8-HP.
Anyone know what the advance on it is?
Also, does anyone know what the little round thingie is in the third picture?

 

[MOBILEMERCMAN]

As I recall V8 modules are 24 degree maybe some are 22. V6's are 18 . I don't recognize the other markings you mentioned. I can research tomorrow if no one else chimes in.

 

[gcarter]

Thanks Jim.
I appreciate your input.

 

[DAREDEVIL]

On the navy seal boats,,,thats a back up coil..so if on the way they can switch over with out stoping.
the little round thing is a switch seliniod !

 

[bajacleveland]

Advance curve

 

[gcarter]

Advance curve

Now that was really helpful!
Thanks :seeya:

 

[BUIZILLA]

you got a V6 chart?

 

[bajacleveland]

you got a V6 chart?

Sorry no