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Has anyone experimented with light or heavy flywheels in Jet boats?

2K views 9 replies 9 participants last post by  Schiada 201 
#1 ·
I have a 50 lb flywheel, a 35 lb flywheel, and a aluminum fly. The motor is a healthy 427 bbc 11.5 comp., going in this 21 fairly light cruiser. Just curious if there would be any noticable differences. I thought the 50 might give me a little more torque but I really don't know. Any experience out there.........I got a feeling someone has tried it......Thanks ahead of time.
 

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#2 ·
I have a 50 lb flywheel, a 35 lb flywheel, and a aluminum fly. The motor is a healthy 427 bbc 11.5 comp., going in this 21 fairly light cruiser. Just curious if there would be any noticable differences. I thought the 50 might give me a little more torque but I really don't know. Any experience out there.........I got a feeling someone has tried it......Thanks ahead of time.
All depends on what you're going to do with the boat...

I like light flywheels (aluminum) because of the rate of decel (play on rivers and good throttle response is required).

A heavy flywheel can help prevent overreving the engine when you vent the pump, but otherwise don't know of any more positives one way or another....

GT :)hand
 
#9 ·
Well, That's easier, I have a good quality flex plate on it, and the whole motor is perfectly balanced so maybe I'll just leave it on there.....I wasn't sure if I could run a flex plate only. I wondered if a heavy flywheel would give it more rotating mass and give me higher rpm's and slightly higher mph. The motor is coming out of the v drive. I am going to change to a different cam, with lower rpm range.

Thanks for the feedback. :)devil

I still don't know what impeller is on the thing.... might be a or aa. Is there a easy way to tell what size of impeller?
 
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