How to Determine Drive Ratio
02-25-2012, 08:54 PM
#1
Registered
Thread Starter
Join Date: May 2008
Location: Corona del Mar, CA
Posts: 27
Likes: 0
Received 0 Likes
on
0 Posts
How to Determine Drive Ratio
I have a 28' Cat with a 525HP and Bravo 1 XR drive. Is there a way to determine my drive ratio based on drive serial numbers? Or, is drive ratio info normally noted somewhere on the drive or engine? I have the serial #'s, but the boat is currently hundreds of miles away in storage.
02-25-2012, 10:05 PM
#2
Registered
Join Date: May 2010
Posts: 638
Likes: 0
Received 0 Likes
on
0 Posts
The serial numbers can tell you. You have to be able look up service history. Maybe someone on here can access that for you. With your set up I am going to say a 1.5 ratio. What size prop you running at what speed and rpm. That will give us a clue.
02-26-2012, 09:06 PM
#4
Registered
Thread Starter
Join Date: May 2008
Location: Corona del Mar, CA
Posts: 27
Likes: 0
Received 0 Likes
on
0 Posts
I bought the boat in the fall and have only been out once and I'm not sure exactly where I was as far as RPM's, but I was only topping out at 70 MPH. The boat has a 24" pitch 4-blade Bravo 1 prop, a bit too small for me since I'm not so concerned with hole shot or acceleration. Below are engine and drive serial #'s and max RPM info based on my engine. I'd appreciate any help.
Max Wide Open Throttle RPM: 4,800 - 5,300
Rev Limiter RPM: 5,400
Drive #: W242929
Engine #: OM960795
Transom Assembly #: OW161C63
Max Wide Open Throttle RPM: 4,800 - 5,300
Rev Limiter RPM: 5,400
Drive #: W242929
Engine #: OM960795
Transom Assembly #: OW161C63
Last edited by Donch; 02-26-2012 at 09:08 PM.
02-27-2012, 06:59 PM
#5
Registered
Join Date: Mar 2006
Location: Lake George NY
Posts: 432
Likes: 0
Received 0 Likes
on
0 Posts
Your drive ser. # is OW242929 Bravo 1XR 150:1
Transom # is OW161063 not a C
Eng ser.# is correct a 525 EFI
Was reg. 04/18/08 in a Magic 28 model Scepter.
Looks like there hasn't been any warrenty repairs done or fixs needed for your ser. #'s
Your drive was born as a 1:50 and its been almost 4 years so somewhere along the line a gear change could have been done. Hope this info helps you.
Transom # is OW161063 not a C
Eng ser.# is correct a 525 EFI
Was reg. 04/18/08 in a Magic 28 model Scepter.
Looks like there hasn't been any warrenty repairs done or fixs needed for your ser. #'s
Your drive was born as a 1:50 and its been almost 4 years so somewhere along the line a gear change could have been done. Hope this info helps you.
02-27-2012, 10:30 PM
#6
Registered
Join Date: Mar 2009
Posts: 496
Likes: 0
Received 0 Likes
on
0 Posts
0M960795 has had some work done.
Hope this helps.
02-29-2012, 08:55 PM
#8
Registered
Thread Starter
Join Date: May 2008
Location: Corona del Mar, CA
Posts: 27
Likes: 0
Received 0 Likes
on
0 Posts
Very helpful, thank you. A gear change was probably never done, the boat only has a bit over 50 hours... I'm going to try a 28" pitch prop and see what I get for RPM's. Thanks again.
