I used cam specs at .050, not seat to seat. Now I see.

Dave

How did your numbers look after the change to seat-to-seat?

Still not where yours are, but improved. Probably airflow.

rpm hp tq
2000 183 481
2500 240 505
3000 297 520
3500 359 539
4000 415 545
4500 457 533
5000 475 499
5500 464 443
6000 436 382

I like this curve much better than mine.

Dave

thanks guys, I have been running this setup for some time now and it seems to be working pretty well. the only problem I see with my setup is where I have the boat propped. I am running 5100 - 5200 rpms. It appears the HP peaks at 5500, I may benefit from turning a little more RPM's. I was thinking of having my props labbed, that may get me to 5500 where my peak torque is.

thanks again, I guess I was pretty accurate with my estimates.

One other thing I did was port the intake runners on the heads and match the intake to the gasket. I don't think that would be a huge difference in power, maybe 10-15 hp??

Merc also recommended trying a set of labbed props that are one inch larger in pitch than I have now and I would turn 5300. I am running 25P mirage plus, they wanted me to try a labbed 27P mirage plus.

I just don't feel like wasting the money on new labbed props. I think I may keep everything the same after thinking this over some more.

I'd be curious if the consensus would be to prop for max torque, max hp or somewhere in between. My own unedumacated opinion is to prop half way between max torque and max hp is the best the boat will do. Comments?

Airflow makes a huge difference on the dd2000 Panther, so I am sure any port matching you did was beneficial.

Dave

Here is my experience with propping for max hp and max tq. When I first set up this boat I was running a 21P mirage plus to 5800 rpm's and 70mph. I then put on a set of 23P mirage plus and ran 73 mph and 5500 rpm. I then went to a set of 25P "Mirage", and same speed 73mph and 5300 rpm. I then went to a set of 25P Mirage plus and the boat woke up a bit to 76.5 mph on the gps in dead calm water and and 5200 rpms.

After analyzing the nubers that Crazyhorse gave to me, I think I am keeping everything as is.

I have seen deferent results on other boats.

I like the nice flat torque curve from 2000 rpms to 5500 where I have over 500 ft lbs. I am pretty happy with my selection.