dave269

I'll be installing a bravo xz outdrive on my 25' sxt warlock cat. would a nosecone be recc or just install it without ? I have all winter to do the work. If yes, what brand cone ??

articfriends

iTrader: (1)

The question is HOW FAST do you currently run? Back when my 272 Baja only ran around 90 mph when I bolted my spare drive on without a nosecone it would slow down a solid 4mph or so, I use a well blended in hydromotive nose cone fwiw, Smitty

dave269

the guy that sold me the boat had a 572 w/ blower and the outdrive had a nosecone on it, he claimed that the boat ran 118 mph on gps speedometer. I'm installing a 565 w/ a blower, est about 850 hp. and a bravo zx drive w/ water pick-up in the nose. just wondering if I should do a cone over the winter.

tomas_wallin

For me it was the other way around (gained 5mph with a std lower over Imco lower) with my 28 Pantera that also ran around 90mph

articfriends

iTrader: (1)

I had the same experience too (sorta)-boat ran 99.5 mph with my current motor in it with very well blended hydro nose cone on a stock length merc lower casting , lost 5-6 mph with a Imco shorty (saw 95 once but usually 94 or so) , put a 1 inch spacer on, was still 5 mph slower, put a 2inch spacer on, was slower yet, put original housing on with nose cone and immediately had my speed back, sold that imco garbage. Never tried a merc lower without a nose cone at these higher yet speeds as it went slower when it was in the 80's with a non-nose coned drive, Smitty

articfriends

iTrader: (1)

The kinda speed your running I wouldn't even think of NOT running a nose cone, fill it and blend it though , I spent about 10 hours grinding, filling and sanding (with a D/A) on my fastest lower, Smitty

dave269

do they make a nose cone that works with the existing holes that are in the nose now, or do I need the cone that has a hose on the top of it ?

Mr Gadgets

Hydromotive, does not like any holes in front of the cone. You can drill the side water ports, if your X isnt too high and cover the low water pickup. Most my experience has been with V bottoms and Hydromotive cone works the best. Not sure about a cat though. I have dimensions for drilling the side ports if you want them.

Dick

pqjack

just curious...at what speed nose cones start to make a difference?
im runnin 77-78 with an XR....

Kings11

iTrader: (1)

I was told not to use a Nose Cone until the props blow out, I am running 81 mph at 4800 in a twin application. Curious again now lmao...