Aluminum flywheels really let the engine rev fast.... don't fly out of the water
without a rev limiter 
Not really a Bowtie thing, more of a compression ratio thing, the aluminum flywheel is more rigid (way more) and is a lot easier on the starter.....
Honestly the main reason we use aluminum in the Rock Dodger was two fold, I feel like I am giving away secrets here, but here goes....
The first reason we like a light flywheel has nothing at all to do with acceleration, but decelleration....If a whitewater boat can't slow down quickly, you wont be able to pick up the throttle and power through a rapid, you have to risk lack of control because of low nozzle velocity compared to hull speed (read; no steering)...
The second is, well, you can run two ring gears on the aluminum (and steel) and the reason I like to do that is we can run two starter motors, one up top and one block mounted....Having a working starter in some cases can save you from losing your boat to a swell or rock if the engine dies....
These reasons are not common, but I have become a large fan of them for other reasons..
1- you lose 20 +/-pounds of weight over an iron FW.
2- they look bitchen polished if they are visible
3- they allow for killer throttle response
4- less rotating mass
5- I have never seen one fail
GT
