Oil Injector

[kawhead]

the side seals help contain the oil bath on the center mains, I presume to help engine life with the extra 1k rpm.[vader vs. truder]

[Boomologist]

Hi,
I believe the reason for the center oil inlet is mainly for the center seal. I suppose the crankcase could be machined to accept a conventional center seal but that would involve splitting the crank to replace it for rebuilding.
I get a headache reading about the math, science and engineering behind these amazing engines.

[Teherr]

IMO, the best argument for leaving the oil pump is the changing ratio based on throttle position.   But, this T7 engine can be run either way.  They used this same bottom end in arctic cat free air using pre-mix. 

the only mod for pre-mix is drilling two holes in the top case precisely where the outside bearing holes are.  this is to lube the center bearings primarily, but it will get to the center seal as well. 

[Teherr]

see attached image from JDsleds site.