SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: brian777 on November 29, 2015, 03:57:17 PM

Title: Gm nodular iron crank
Post by: brian777 on November 29, 2015, 03:57:17 PM

What are your thoughts on this crank also what is a safe hp to run with it? Thanks in advance


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Title: Re: Gm nodular iron crank
Post by: jyeager on November 29, 2015, 06:10:50 PM

Flusher or Bostick to the SCJB Phine Please


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Title: Re: Gm nodular iron crank
Post by: GT Jets on November 29, 2015, 06:26:40 PM

RPM is a cast cranks arch nemesis.

About 550 horsepower and 5,200 rpm is my line in the sand.

Heard of much more, but I think luck plays a big part.

GT

Title: Gm nodular iron crank
Post by: Six-Oh-Nine on November 29, 2015, 06:35:34 PM

I'd say 550-600 hp is about the limit... BUT... 6000 rpm is also about all I'd spin one up to... And not 6000 and keep it there... Like "oops... I went 6000"... I've gone harder on them... But then I've also had them let go at less... Harmonics are the devil on cast cranks.


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