I've often wondered about the comments about the seeming lack of power for various starters for turning over larger engines, such as 90's and120's.
Now I know first-hand why the comments.
I needed a second starter that I could dedicate to my heli shaft adapter, and picked up a used Sullivan Deluxe Hi-Tork. I put the shaft adapter in my old Penford Autostart, and put the Sullivan in my plane fieldbox.
Today, I broke in a Magnum 91 FS. That Sullivan would NOT turn that Magnum over without help. I went and got the Penford - it turned the engine over quite smartly.
So, the Penford goes back in the plane fieldbox and the Sullivan will be relegated to starting the .32 in my heli !
In fact, the Penford will turn my Ryobi 31 over if I flip the prop once while engaging the starter - the Sullivan would not do the same with the Magnum 91 !