Looking at a dyno sheet from the Cig that shows 977.1 TQ/1060.5 HP at 5700. At 6100 shows 948.5 TQ and 1101.6 HP. Actually at 6300 shows 924.5 TQ and 1108.9 HP. From 5000 to 6000 HP went up 100. So based on these it is feasible. We had 911 HP at 4500. ??

my 87 no step no notch boat with 650s on sweptback xrs regular lowers turn 5 blade 28s 5600 at 80mph.

that sounds closer to me...+\- 600rpm, 8mph.

what kind of 5 blade do you have?
what are your slip #s?

damn!

https://cimg8.ibsrv.net/gimg/www.off...e8fd6373e.jpeg
This is what I have for mine

p5x hydromotives. I average 78mph landed full of fuel on slack tides. But run light I’ve seen 82 all on gps. I think my slip numbers are a little high. But never really put much into it. I’m swapping over to imcos so I’m gonna start the prop shuffle lol.

So the engines were built and dynoed 5+ years ago???
Did you have them built?? How many hours on them?? What is timing set at and do you know what it was set at when dynoed??

yes, but done by previous owner. Not sure what they were timed at before, but I have them base at 24* and if I remember right 34* at 3000rpm

only a hundred hours or so on the motors, boat sat for awhile before I bought it.

if you sell the props keep me in mind I’d be interested to try them

they will be for sale in about 3 weeks.