I am a nube here.
I just bought a 22' Placecraft tunnel with a 540CI Whipple charged BBC
Dyno sheet shows 663 HP on pump gas 5 PSI
The boat runs about 70MPH with 4 people and stuff......
Engine tack would show 5400 RMP
The pump bearing started to make noise so I pulled the pump for repair.
It has a preload impeller (that is bent / damaged) a stock type shaft, which is beginning to twist. Impeller is SST, “A” which is re-usable
Housing and impeller will be re-used in a new build.
My question is:
Why would I only be turning 5400RPM? With an "A"
Shoemaker said that this would equal about 450HP??
I really don't think that my 3500# boat with 4 people would hit 70MPH if I only had 450HP would it?
Something is off here