Raising transom to 25" - Page 3

dcobbett · #21 12-04-2005, 02:26 PM

Bigshrimpin,

The second picture is ugly as well. Not much connecting the 5" riser piece to the rest of the transom.

Attached are some pictures of the plate on the transom of the boat I just bought. I'm told that it was installed when the boat was commissioned. It's the full width of the cap, the outer edge is bent and the inner top edge is welded. It's 23-1/8" from the bottom of the hull to the top of the plate, and the width at the cap is about 2-1/4".

The 175 mariner didn't create and visible movement or stress on the transom. Also, the rest of the transom is very clean and absent the usual array of holes and devices. The holes in the lower starboard side were for a depth finder, and they appear to have been properly sealed.

I'm told the current bolt pattern in the plate is consistant with OMC's current bolt pattern. At 23" to the top of the plate, can I buy/install either a 20" or a 25" engine for this transom?

[image]file:///C:%5CDOCUME~1%5CDaniel%5CLOCALS~1%5CTemp%5Ctemp-image-0.jpg[/image]

[image]file:///C:%5CDOCUME~1%5CDaniel%5CLOCALS~1%5CTemp%5Ctemp-image-5.jpg[/image]
[image]file:///C:%5CDOCUME~1%5CDaniel%5CLOCALS~1%5CTemp%5Ctemp-image-2.jpg[/image]

BTW, sorry for the white stuff in a couple of the pic's. Mother Nature's contribution for the day.

dmlowe · #22 12-04-2005, 02:31 PM

Dan,

Just to jump in on the engine thread, I put a Suzki 115 on the back of my '72 20 footer. Initially I was concerned that it wouldn't be enough power, but that certainly wasn't the case. It cruises happily at about 30 and has enough power to pop the boat right on plane. Plus, its light weight takes a load off the transom. Sure, a 150 would probably push it along at about 45, but unless it's flat calm (and how often do we see that in New England) you'd be airborne half the time and hanging on with white knuckles.

I'd also go with the full transom replacement...

dcobbett · #23 12-04-2005, 02:32 PM

Bigshrimpin,

Sorry about the pictures. I have an account with comcast and I thought I could "share" off of that. I'll figure it out or use photobucket or similar in a while and repost them.

dcobbett · #24 12-04-2005, 03:21 PM

Bigshrimpin,

Here's another try at the pictures:

dcobbett · #25 12-04-2005, 03:27 PM

Stripernut,

I'm interested in and agree with what you are saying. Is your 115 a 4 stroke, and what year is it?
Also, what is your rpm and speed at cruise and WOT, and is the speed measured with a GPS? Any idea of fuel burn?

thedink9 · #26 12-04-2005, 04:34 PM

Dan
Just read this thread and also the Fisherman. Two new motors are advertised by a CT Marine company. A F115 TXR ( I beleive 4 stroke and a 2 stroke 150 (150TXR)Both are listed for $7,695. Dink

Bigshrimpin · #27 12-04-2005, 04:44 PM

D - if you want to do it the easy way . . . a mechanical jack plate (cheapway) or Hydraulic jack plate (more expensive) will do the job especially if your transom is solid. Hydraulic Jack Plates also allow you to maximize your speed (several MPH)

http://www.bobsmachine.com/Products/..._hydraulic.cfm
http://www.land-and-sea.com/marine/het/why_jack.htm

RS · #28 12-04-2005, 04:51 PM

Dan,
Congrats on getting her home safe and sound.

dcobbett · #29 12-04-2005, 06:36 PM

Bigshrimpin,

Do you think I can bolt on a 25" shaft and set it up a few holes to set the plate near where it should be relative to the hull without getting into too many problems or lose to much performance from the engine?

thedink,

Thanks for that info. I'll follow up on the ads.

Roger,

Thanks. It is a good feeling to have the boat in the driveway. The trailer towed great; no problems at all, except I now know what some people are talking about when they discuss road/pavement induced harmonics. I dealt with that for about 40 miles eastbound on RT 78 between Harrisburg and Allentown, PA. The trailer would start bouncing up and down, and I had to slow to 40-45mph to get it to stop. The problem seemed worse if I was in a sag curve in the road's profile. Don't know if there was just enough added compression in those conditions or what was going on. It was an old concrete road surface that had been paved over (bituminous concrete) and hadn't been well maintained. East of Allentown, the road's surface was in better shape, and the problem seemed to go away.

Bigshrimpin · #30 12-04-2005, 07:37 PM

[QUOTE]
Bigshrimpin,

Do you think I can bolt on a 25" shaft and set it up a few holes to set the plate near where it should be relative to the hull without getting into too many problems or lose to much performance from the engine?

Looking at this pic . . . The holes on the bottom will only let you go up one notch (1"). 24" is still too low . . . You've got 3 choices . . . Drill new holes, get a jack plate (manual jackplate $200 bucks, or redo the entire transom to 25" correct height.