smiklos@sunprint

iTrader: (1)

Did it improve bow lift?
Thanks
Steve

CB-BLR

Steve,

With proper outdrive depth, most all of the Bravo ear styled props seem to carry the bow fairly well with this hull. The 5 and 6 blade props are much smoother than a typical 4 bladed Bravo, and seem to carry the whole boat better.

The only time I have experienced stern lift with this boat, is when I have either tried a cleaver style prop, or a prop with a lot of cup. On these occasions, when aproaching speeds of 90+, I could feel the rear of the boat lift and move to one side, like the prop was walking on the water... a scary feeling.

Hope this helps,
Chris

digger308

Chris,
Did nordic rig your boat with the 600 new and if so do
you have any pictures of your hatch and seat that you
would share?

CB-BLR

Digger,

Yes they did rig my boat new with the 600. But it had a 496 sitting in the engine bay when I ordered the boat, but no interior or rigging.

Here is a picture showing the modifications they did to the front and top of my hatch in order to clear the motor.

Hope this helps,
Chris

digger308

Thanks Chris,
looks great. did they have to more your seat forward or notch it any that you know of?

Aaron

CB-BLR

Aaron,

No, I dont think they had to move the seat, they did notch the back of the forward lip of the hatch to clear the pulley on the supercharger.

You are going to love that motor in your boat.
Start with a 28 pitch bravo prop, and make sure that the outdrive lower shaft is aproximately 4-4.5 inches below the pad at the rear of the boat. You should see aproximately 81 mph at about 5400 rpm. Or you can use a 30, which will net you higher cruise speeds, and a top end of 80, at approximately 5100 rpm, but it lugs the motor a little.

Chris

P.S. If you send me your e-mail address, I will send you a prop/spacer table from my boat. [email protected]

Rage

Steve,
What maximum water pressure did you see with the IMCO drive at what rpm/mph? What pressure did you limit to by running at 3500 rpm and set the popoff to?

Thanks,

Bill

digger308

Thanks Chris,
Looking forward to it if Nordic ever gets to it. I guess they are to busy with the magic boats to deal with mine right now so loosing my patience a bit. What altitude are you running at?

[email protected]
Aaron

Steve Zuckerman

Bill anything over 35PSI in an open cooling system can push water past head gaskets, and in some cases (40+) break the plastic water pump housing. I've run into both with the Imco, as have others. Closed systems I don't know.
The Merc blow off valve is supposed to open @ 35PSI, but my first one wouldn't open until 40. You can reduce the blow off PSI by clipping the internal spring. This is an overpriced little plastic toy ($300), but it can save your motor.
Regards,
Steve

Rage

Thanks Steve. I record sea water pressure in the low 40's at WOT with the 496 closed cooling system and a Bravo X1. I think I am free of any plastic parts in the sea water plumbing.