B-Max
 

How much speed loss did people see when they changed from an xr bravo1.5 ratio to the b-max 1.3 ratio?

If you don't reprop it you will loose a bunch, but with the correct prop you will be back where you were before or more.

I went from a 30 pitch with 1.5 xr at 105 mph to a 24 pitch 1.3 b-max at 96 mph

You did try a 26 also didnt you?

yes I did it went 98mph at 5700 rpm

shortie or standard???

The xr was a standered and the b-max is there cresent lower

-5mph

I meant to ask is the BMAX a standard length or -2. I switched to standard length from -2 to see if i can get my BT to hook up a little better and be easier on the drives. I know that the BMAX takes a lil xtra hp to turn, so on a complete guess id say a couple mph lost anyway. :coolcowboy:

The b-max is not a shorty

-4 to -6 at least no matter what prop you use! Good luck!

B-MAX does come as a shorty or standard lenght!:angry-smiley-038:

Dennis,do you need to try a 26 merc labbed 4 blade,I could bring one to hardy/hotboat weekend,Smitty

If you could that would be great I will try anything right now. I am getting there on wed. night so I will look for you

I lost about -5 with a Cresent Drive. Went from about 90 to 85 and an occasional 87 very light and by myself. I proped from a labbed 30 bravo or standard 32 to a standard 28 bravo

I put xr lowers on and took the Bmax's off I lost 6 mph with the same 5 blade props. Now that I have the Bmax's fixed so they don't leak I have them back on and the speed is back.

I went from a modified 32" Bravo I to a box stock 26" Bravo I and only lost 2 mph on top and cruise speed stayed the same.

They seem to be working fine for me. ;)

[YOUTUBE]http://www.youtube.com/watch?v=ExbZfhvYlsA[/YOUTUBE]

that was cool....i like the big leaps.

Dean Now offers a 1.5 Ratio. I Ordered a new B - Max to replace my 1.5 ratio XR with a B-Max 1.5 Ratio and have no Speed Loss.:evilb:

I went from a xr to a scx and lost 0 mph. That is the way to go if you want strong and no speed loss. Just my 2 cents

I like to hear that John! How fast are you going?

Cool! I considered swapping to the 1.5 to get my speed back.. Maybe in due time! I had a 100% trouble free boating season this year and it was an abnormally rough summer on the open seas!

What kind of power are you running?

Please keep me posted!

I'm running 565 C.I. Merlin Tall Deck with M-3 Procharger - 900 H.P. - 26' Awesome Cat - 32 Pitch Maximus prop - 1.5 B-Max - 105 M.P.H. @ 5800 R.P.M. - Cruise @ 3000 R.P.M. 55 M.P.H.:drink:

My lowers was the worst casting I have ever seen in anything,there wavy, grinding dips,some I cant get out there so deep,one had nose off ,there thick,skegs thick.

I have 2 lowers thats on the boat they were the same casting, the spare looks like they spent alittle more time on it.

I got the boat with the B max with a stock merc foot,the boat was a little off on speed,around 1-2mph,Thin i put the blower motors in it and had a base line, change to the crescent lowers,I sanded/cleaned them up some. I really didn't see much speed dif.I did notice it was not hook up as good at the stock bravo foot,no big deal,I'm babying them getting on plan anyway.I went up 6 prop sizes,now Ive cut the sh!t out of them,hours and hours of it,I just hate I cant get the porosity out of it,I keep grinding and more turn up,Ive thinned them a bunch,Dean said I couldn't grind too much,I think I can see oil thru those holes:drink:

Ive been busy polishing with out a boat all summer

looks at the thickness diff, with the torpedo being bigger and longer,more resistance

the Drive sits back 5/8's. so that puts the prop alittle deeper in the water.

hope this helps
Rob:drink:

Ck out the water holes,must of been a heavy duty grinder.

Hey Frank we got to do yours next:evilb::evilb: It has to slow it down:rolleyes::D


800 grit

The polishing actually slows ya down bro!! I remember at the marina they detailed a #6 boat and polished the lowers... the owner freaked out!!!:party-smiley-004:

I got an idea on the porosity you're seeing, West System 420 or 423... Never tried it but the 423 is an aluminum powder and the 423 is graphite...

yea I know, but atlest it will look good before the first ride,ital be some cool pictures,Frank I bet the bottom will hurt me also,its real slick.

I wonder if it will stay on? how do ya apply It?

You mix it in with the west system epoxy resin.

kinda like filler pudy,ya spread it on fill the holes and sand back smooth,I wonder if polishing will pull it out of the hole?