Brought to you by Barnacle Bill's Marine Supply. (856) 785 9455

Sign up Latest Topics
 
 
 


Reply
  Author   Comment  
jrsirrine

Registered:
Posts: 6
Reply with quote  #1 
Hi all
I have a 24 ft Harris pontoon boat. Just put a 2009 etec 115 hp ho motor on with the old 13.25 x 19 prop. Only hitting 3400 rpm wide open.
Thinking of going with a 13.75 x 13 ? Any thoughts?
Thanks a lot!
Gotsea

Avatar / Picture

Registered:
Posts: 1,386
Reply with quote  #2 
Yup  RPM are way low, you are logging that engine bad, don't run it like that 
__________________
1994 24 WA Baha
2008 300 HP DPXSC S/N 05228253
15 1/4 X 19 Mirage Plus 47 MPH top end @ 5,750 RPM
32 MPH cruising @ 12.5 g/h
 South Florida
PhilH12

Registered:
Posts: 3,503
Reply with quote  #3 
What engine were you running before that was OK with a 19" prop on a 24 footer?  [eek]

My 20' with a 90 HP hits the "sweet spot" (5,200 for my I-3) with a stock aluminum 14 X 11.

Phil

__________________
Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
jrsirrine

Registered:
Posts: 6
Reply with quote  #4 
Hi Phil
Thanks for the comment. That prop came with the motor so I’m not sure what type or size of boat it was on. We just did a quick test and took the boat out. We will try the 13.75 x 13 and see what happens!
PhilH12

Registered:
Posts: 3,503
Reply with quote  #5 
Oh!  It sounded like you took the prop off your old engine and put it on this one.

Carry on then!  [thumb]

Phil

__________________
Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
Nordmann

Registered:
Posts: 1,522
Reply with quote  #6 
Does the exhaust valve work?
__________________
Nordmann.

Sign seen in a dentist's waiting room:
There is nothing the dentist can do, that the patient won't do!
mead

Registered:
Posts: 775
Reply with quote  #7 
Yes. You will need to drop down to a 13 pitch prop
jrsirrine

Registered:
Posts: 6
Reply with quote  #8 
Big thanks everyone.
New prop works great. Wide open we hit about 5200 rpm and about 26mph.

Lake Leelanau, MI

PhilH12

Registered:
Posts: 3,503
Reply with quote  #9 
5,200 still sounds a tad low on a V4, but I could be wrong.   Check your exhaust valve as Nordmann suggested.  What you're seeing does sound about right though - 5,200 and 23 mph with my 14 X 11.

I've played with engine height a bit on mine, but a pontoon seems to be a whole different animal when playing that song.  Raised 2 holes and virtually no difference in RPM's.  You do need to watch water pressure and temps if you do go that route - aeration into the cooling system isn't a good idea.

Phil

__________________
Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
Gotsea

Avatar / Picture

Registered:
Posts: 1,386
Reply with quote  #10 
+1 to Phil, 5200 is a bit low, I not familiar with pontoons but it may be that the engine is to low and creating to much drag, check with some one that knows about pontoons, I know in my application the AV plate have to run skimming the water.    
__________________
1994 24 WA Baha
2008 300 HP DPXSC S/N 05228253
15 1/4 X 19 Mirage Plus 47 MPH top end @ 5,750 RPM
32 MPH cruising @ 12.5 g/h
 South Florida
jrsirrine

Registered:
Posts: 6
Reply with quote  #11 
hi guys
Went to a 14 x 11 per PhilH12's suggestion. Now we are in the zone. ~ 5500 rpm wide open. Reduced top speed by 1-2 mph, but I think torque increased. I can now whip my kids off the tube.
PhilH12

Registered:
Posts: 3,503
Reply with quote  #12 
That 14 X 11 was just what mine came with (used boat/motor) and never had a need to change it.  Glad it worked out for you.

Happy boating!

Phil

__________________
Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

Disclaimer: Activities and modifications described or displayed on this message board and it's pages may be potentially dangerous. E-TEC Owners Group along with Barnacle Bills Marine does not endorse or make any claims to their safety or performance. Be sure a trained E-TEC service technician performs all your service work.