Originally Posted by
ralphierace13
I don't know what os has I was just referring to the os pic an that its a turbo setup..
No, that is not a turbo, that is a roots blower. To the best of my knowledge no one has ever tried to use a turbo on a engine of this size.
Just Google "OS Supercharged" and you will see pictures of it dismantled, here it is on the OS web-page, though not dismantled.
https://www.osengines.com/history.html