There is a simple reason why rotaries can rev high and no it doesn't have to do with the fact that the rotors turn at 1/3 the speed of the crank. Their added weight compared to the average piston more than offsets this seeming advantage. A high speed piston engine as pointed out already uses a short stroke. A rotary still has a stroke. It's easily seen as the lobes of the eccentric shaft. It's roughly 3/4" per direction or 1-1/2" peak to peak. Combine that relatively short stroke with the fact that we aren't reversing directions on anything and it's easy to see why it revs.

 

kane, i got one book, its huge. 271 with what looks like 10 pt font. its going to take a while. its called How to Tune and Modify Engine Management Systems by Jeff Hartman

 

Get Hartman's new book on turbocharging.
Its even better than the Bell book.
In fact, it way better.
Hartman is my hero. Seriously.

 

the street turbocharging book is on the way. what is the title of Hartman's book

 

"Turbocharging Performance Handbook"
http://www.amazon.com/Turbocharging-...9921951&sr=8-1

 

bought it. i hope it doesnt take as long to get as the other 2

 

I have both of those books you mentioned, Chet, and they are good reads. I ordered Hartman's new book and we'll see how it stacks up to Bell's.

The Hartman EMS tuning book is good, but rather dense, so if you read to actually understand what is happening it takes a while. It's best to read 10 pages, take notes (if you're a more visual/tactile learner like myself), and then re-read those 10 pages.

 

i've seen the video clip... that just wasnt how i took it coming from jeff, lol

 

Rotary Pros.
- Small size for power output.
- Light weight compared to similar powered engines.
- little vibration because rotary motion (not reciprocal motion like pistons)
- Good volumetric efficiency
- Hot Exhaust (better for turbos)
- Simplistic and strong main components.


Cons:
- Poor Torque
- Poor gas mileage (poor thermo efficiently)
- Hot exhaust (more expensive components in exhaust system)
- Complex compression sealing, weak compared to a piston engine)
- Prone to flooding
- Harder on ignition system
- Carbon build up (potential carbon lock/jammed apex seals)
- Prone to engine failure if over heated.
- Oil consumption