Roller Rotary

[RETed]

Less friction = more efficient engine
More efficient engine = more power using less fuel

Or course, the downside is that needle bearings are less reliable versus journal bearings.
I'd imagine service interval is a lot shorter for these needle bearings versus journal bearings.
If you're building a "race engine", this is not going to matter.


-Ted

[sickofpistons]

Originally Posted by RETed

Less friction = more efficient engine
More efficient engine = more power using less fuel

Or course, the downside is that needle bearings are less reliable versus journal bearings.
I'd imagine service interval is a lot shorter for these needle bearings versus journal bearings.
If you're building a "race engine", this is not going to matter.


-Ted

What would make the needle bearing less reliable vs journal?
Thanks.

[RETed]

Originally Posted by sickofpistons

What would make the needle bearing less reliable vs journal?

It's inherent to the design...
Less parts = better reliability
This is why journal bearings are used in the most inaccessible locations.

Anyone who has lost a pilot bearing on their RX-7's knows what I mean...


-Ted

[Judge Ito]

on my own personal 13B I tried roller bearings on the front and rear stationary gears over 6 years ago. there is pros and cons..