Thread subject: Whaler Central - Boston Whaler Boat Information and Photos :: 15 Sport repower
Posted by Mattzilla5 on 05/06/23 - 7:38 PM
#1
1978 15 Sport repowered recently with a 2023 Suzuki DF60A. Wanted to share results for those thinking of a repower. Results are with a 3 blade PowerTech 17p stainless prop. Running 44mph with one adult and 6 gallons of fuel onboard. Unbelievable cruising nearly 16 mpg. Engine is mounted very high due to the splashwell but no cavitation. Engine weighs 229 lbs.
Edited by Mattzilla5 on 05/06/23 - 7:40 PM
Posted by Mattzilla5 on 05/06/23 - 7:42 PM
#2
Cruising numbers
Edited by Mattzilla5 on 05/08/23 - 1:09 PM
Posted by Phil T on 05/08/23 - 12:01 PM
#3
I think you are dialed in. Would not expect more than 46.
Posted by Mattzilla5 on 05/13/23 - 12:55 PM
#5
All the way up joe
Posted by Pocrocky78 on 05/24/23 - 6:53 AM
#6
Matzilla. I am just about to do the same thing. Putting a Suzuki DF60 on my 1978 15 sport. Any chance you could post a photo of the splashwell area from the bow end (so to speak) so that I can see how you mounted it. Many thanks. Patrick - Ireland
(Please keep all correspondence here so all of our members know what is going on)
Happy boating and thank you
Edited by Joe Kriz on 06/04/23 - 6:46 PM
Posted by Phil T on 05/24/23 - 7:46 AM
#7
Patrick - You should check the mounting hole spacing you have on the transom.
I emailed you the measured drawing of the BIA standard pattern.
To mount the engine, I would start with the top bolt in the 3rd hole counting down from the top (assuming the top mounting hole is 1-7/8" (47.6 mm) down from the top of the transom.
When you raise or lower the engine it will affect WOT rpm's by 150 for each hole, plus or minus.
Edited by Phil T on 05/24/23 - 7:49 AM
Posted by Mattzilla5 on 06/04/23 - 5:46 PM
#8
Height
Posted by Mattzilla5 on 07/16/23 - 6:11 AM
#9
Closer look
Posted by Mattzilla5 on 07/16/23 - 6:13 AM
#10
2
Posted by Phil T on 07/17/23 - 8:02 AM
#11
Matt - Do you have a photo showing a view from the rear, illustrating the engine mounting bolt positions?
(Looks great btw)
Posted by Mattzilla5 on 07/21/23 - 8:09 AM
#12
Yes
Posted by mdwdrw on 05/05/24 - 7:12 AM
#13
Thank you for taking the time to document your install. I am also looking at repowering my 1986 15 Sport. Unfortunately the 1985 55 Evinrude does not have the standardized mounting holes I have found for later engines. So I will be drilling new holes.
Doing some measuring I also noticed that if the Suzuki engine is set on the transom, The lower holes would be below the wet well. Your photos show me exactly what I needed to know. I'm having difficulty finding a measurement from the top of the transom to the cavitation plate in the Suzuki installation manual.
Could you measure the position of the cavitation plate to the bottom of your hull/transom? I can see you have it working, but if you wouldn't mind, I'd like to know your final measurement. The Suzuki install manual states even with bottom 0 to 1" below the bottom of the hull. What did you come up with?
Again, thank you for your post and time. Mark
Posted by Phil T on 05/06/24 - 4:48 PM
#14
Mark -
Do NOT go by the Suzuki manual. This is not applicable to Boston Whaler hulls.
The recommendation for Boston Whaler models is as follows:
Models 13' and below - anti cavitation plate .75 - 1" inch
above the keel.
When using the BIA mounting template this translates to 1 or 2 holes "up" with the top bolt in the 2nd or 3rd hole down from the top.
Models 14' and above - anti cavitation plate 1.5 - 2" inches
above the keel.
When using the BIA mounting template this translates to 2 or 3 holes "up" with the top bolt in the 3rd or 4th hole down from the top.
Edited by Phil T on 05/06/24 - 4:49 PM
Posted by mdwdrw on 05/11/24 - 5:15 AM
#15
Phil, thank you. So that moves the engine up quite a bit on the transom. Haven’t pulled the trigger yet. Little bit of sticker shock being absorbed. Thanks again.
Sorry for the delay. I’ve asked to have my email address updated to one I still monitor.