I brought up this same conversation about 700 horse Small block nascar motors with Harold from Chief who now works with Ben who owns Precision Motors out of Grand Haven Michigan, by the way both Phenomenal engine builders and people.

Harold who is an Icon in this business Schooled me on how lightly built those lightweight nascar motors are built , and pretty much one unload-load off a wave would do it in.
I i have been really privileged to meet some great people in the boat business here the past year up in Michigan

NASCARs are built to last...about 3 hours. And once a Nascar gets airborne, they aren't usually worried about getting off the throttle for re-entry to the track, cuz they are usually upside-down.

I would think the lighter you make the rotating mass the worst it would be around the dock with a larger cam. Your not going to spin it to 8500 RPM'S.

i have never believed that the light weight cranks were the way to go,espically in endurance marine engines.

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I thought an old 502 kellog crank was bout 75-80 ??

We would “blade” our superbike cranks to cut through the oil bath better but also mostly for better acceleration shooting out of the corner faster. With 10-20 corners a lap that can be helpful, but a funny consequence is that sometimes we lost acceleration grip on tire because the lighter crank didn’t tame the engine pulses as well and was a palpable result on the track. These are on 1Liter/200hp engines turning 14k rpm. A lighter crank in a boat with a bravo drive is the wrong direction, lol.

Ahh thanx man, that really means a lot

:D:D

Do we need to start a Avatar fund raiser for you so you can reup your membership......... ( . )( . )

I agree with you on this. Similar to light weight flywheels. I see where MT is coming from but endurance like mike said I'd stick with the norm and not chance it. Some say lighter cranks are easier on rotating assembly. The little bit of hp increase wouldn't be worth it to me unless it's proven. Not sure in a boat if light weight crank would effect deceleration like aluminum flywheels do or not. I'd let my machine shop reduce weight where they can while balancing without effecting the strength. I like the 8 counter weight cranks and so does my machine shop. Understandably why.... Makes balancing much easier.