Randy Nielsen

iTrader: (4)

I finally decided to upgrade my engines. Am pulling out 496 mags (375hp) each & replacing with 650hp 540s. Anyone have an idea what I can expect speed wise? The boat is a 2007 Kachina 34 Bolero with 1.50 Bravo xr's & -2 speedmaster shorties with a 1" spacer Bravo1 4blade 28p labbed props. The boat will run 70mph @ 48-4900 rpms. BTW I remembered why I dont fix boats for a living anymore. LOL. Randy

johnnyboatman

iTrader: (5)

did you get 540s already

Randy Nielsen

iTrader: (4)

Not in hand yet, I will be trading my 496s when I get them out.

mike tkach

iTrader: (3)

RANDY,i would look for 13 to 15 mph gain after it is proped right,enjoy.ps,this is asuming the new engines make the 650 hp.

Randy Nielsen

iTrader: (4)

Mike, what would your guess be for props?

mike tkach

iTrader: (3)

i would start with out of the box 30p bravo ones.

Randy Nielsen

iTrader: (4)

Thats about what I figured, was suggested to try maximus 5 blades labbed but I've heard they are hard on the drives

mike tkach

iTrader: (3)

i agree,but it also depends on how u drive it.

Randy Nielsen

iTrader: (4)

Well......I learned the hard way about hole shots so I dont do that but with the current setup I have a lot of prop slip until it planes but I can throttle back & cruise at 28-3000rpms where as I couldnt with the stock bravo28s. I do like to hammer down once in a while but the oil companies are keeping me in check. LOL. Randy

Randy Nielsen

iTrader: (4)

The engines are out & the bilge is filthy go figure, after scrubbing with dish soap & a pressure washer I was only 1/2 way there. Went to the parts store & asked for the best degreaser they have. Its called Super Clean & WOW does it work! Ran out of daylight but I got most of it, will finish up tomorrow. Randy