Like Tree20Likes

5.3 LS into a Four Winns U17 - Build Thread

Reply
Old 03-11-2016, 04:31 PM
  #1
Registered
Thread Starter
 
Join Date: Mar 2013
Posts: 18
Default 5.3 LS into a Four Winns U17 - Build Thread

Hi Everyone,

As promised in EFI Fuel Plumbing - Best Practices, I will use this thread to chronicle the installation of a 5.3 LS engine into my Four Winns U17. I blame/credit Tim Moore and his Skater for inspiring me to start this project.

Here is the plan:

Engine
- Stock 5.3l LM4 engine from a Trailblazer
- Holley Fuel Injected Intake Manifold w/4150 throttle body. This moves the spark arrester from the front of the engine to the top. This helps with packaging in the small engine compartment…and I think it looks cool.
- Holley Fuel Rails to go with the above intake manifold.
- Holley HP ECU
- Truck Oil Pan, the LM4 oil pan is a bit shallow for my liking.

Mounting
- VP SBC bellhousing
- Custom fabricated front engine mounts. (I ordered a PAYR plastic engine to help in this effort)
- VP coupler that is used on their LS based engines.

Cooling System
- Johnson Pumps F6B-9 raw water pump. I’m planning on using an aftermarket harmonic balancer to drive it.
- Hardin Marine’s Closed Cooling System. Credit must be given to Scott Price at Hardin. He has answered all my questions quickly and in great detail. He definitely earned my business.

Exhaust
- Marine Power LS1 Manifolds
- Fabricated O2 sensor spacer

Here is the boat...


Stay Tuned,
Eric
enginerd is offline  
Reply With Quote
Old 03-11-2016, 05:07 PM
  #2
Registered
Thread Starter
 
Join Date: Mar 2013
Posts: 18
Default Front Motor Mounts

The original rubber engine mounts were starting to show signs of wear. Volvo Penta used an oddball mount that would cost $250+ to replace. I decided to convert it to a mercury style mount and ended up buying these: http://www.hardin-marine.com/p-13539...ine-mount.aspx. Oooohhhh Shiny. I have to remake the stringer mounts for these too, but I don't expect that to be terribly difficult.

Here is the motor mount I designed to connect it all together. I'm currently planning to make everything out of 3/8" HSLA. I'm 3D printing all the parts before I spend money on steel and laser time. I should have those done next week to prove out the design.


More updates next week.
Eric
enginerd is offline  
Reply With Quote
Old 03-12-2016, 06:56 AM
  #3
Registered
Trade Score: (5)
 
Join Date: Jul 2009
Location: Taunton Ma
My Boats: 33 Fountain 35 Mainship
Posts: 6,820
Default

Cool project, good luck. I'm putting 2 5.3's in a 28 pc formula soon.
Unlimited jd is offline  
Reply With Quote
Old 03-12-2016, 06:17 PM
  #4
Registered
 
Join Date: Feb 2012
Location: Kelowna
Posts: 49
Default

cool project, i got a lq4 that i plan on putting in my h210, ill be watching this for sure. cant wait to see how it goes
LTZCrew is offline  
Reply With Quote
Old 03-12-2016, 07:02 PM
  #5
Platinum Member
Platinum Member
Trade Score: (1)
 
donzi matt's Avatar
 
Join Date: Jul 2003
Location: Moultonborough NH
My Boats: 95 Cigarette Top Gun
Posts: 1,325
Default

Quote:
Originally Posted by Unlimited jd View Post
Cool project, good luck. I'm putting 2 5.3's in a 28 pc formula soon.
You won't even put one 5.3 into a Dodge Dakota.
donzi matt is offline  
Reply With Quote
Old 03-12-2016, 08:29 PM
  #6
Registered
Trade Score: (5)
 
Join Date: Jul 2009
Location: Taunton Ma
My Boats: 33 Fountain 35 Mainship
Posts: 6,820
Default

Cuz I have too many of these damn boats to work on lol
Unlimited jd is offline  
Reply With Quote
Old 03-13-2016, 11:33 AM
  #7
Registered
 
Join Date: Oct 2011
Location: Dayton, OH/Burnside KY
My Boats: 98 Checkmate 253 408ci LSX
Posts: 216
Default

Just an FYI, Summit makes an SFI Balancer that has the SBC/BBC bolt pattern in it. I used it on my LS swap into my Checkmate to run a similar Jabsco pump. The part # is SUM-C2500 http://www.summitracing.com/parts/sum-c2500. A less expensive alternative to the ATI's.






I then built a bracket that bolts to the stock A/C bracket location to hold the housing of the pump. I'll snap some pics when I go out and tinker with the boat later.
corey331 is offline  
Reply With Quote
Old 03-13-2016, 01:03 PM
  #8
Platinum Member
Platinum Member
 
Taboma's Avatar
 
Join Date: Sep 2011
Location: OKlahoma City, Lake Tenkiller, OK
My Boats: 2013 28 Skater 300xs's 2001 Fourwinns 26 Vista, 1996 Fourwinns/Donzi19, 1987 American Skier, 1957 Lone Star "Maxine the Water Queen" restoration
Posts: 576
Default

Very cool project! I have a U-19 that I bought new in 1996. I've been updating it for the life of the boat. Switched it to MPI sequential injection and larger injectors, SS headers, Edelbrock intake and throttle body. Also noseconed the Volvo Penta DuoProp gearcase. With all that, I've only seen 75 MPH on GPS. I would love to put a LS in it! Can't wait to watch your build! Cheers, David
Taboma is offline  
Reply With Quote
Old 03-15-2016, 11:45 AM
  #9
Registered
 
Join Date: Jun 2010
Location: Central IL / Green Bay, WI
My Boats: 32 Sunsation
Posts: 1,104
Default

Cool build, looking forward to it. I wish a lot of that stuff was available 6 years ago when I put the LS in my jet boat. Would have made life a lot easier.
Wasted Income is offline  
Reply With Quote
Old 03-15-2016, 12:07 PM
  #10
Registered
Thread Starter
 
Join Date: Mar 2013
Posts: 18
Default

Quote:
Originally Posted by corey331 View Post

I then built a bracket that bolts to the stock A/C bracket location to hold the housing of the pump. I'll snap some pics when I go out and tinker with the boat later.
Thanks Corey, pictures would be great. Thanks for the link to the summit damper too. I'm assuming you didn't use the keyway?


Quote:
Originally Posted by Taboma View Post
Very cool project! I have a U-19 that I bought new in 1996. I've been updating it for the life of the boat. Switched it to MPI sequential injection and larger injectors, SS headers, Edelbrock intake and throttle body. Also noseconed the Volvo Penta DuoProp gearcase. With all that, I've only seen 75 MPH on GPS. I would love to put a LS in it! Can't wait to watch your build! Cheers, David
Very cool Taboma. I kind of regret not buying the U-19, but they wouldn't fit in my old garage. I love your Skater by the way.

I printed the engine mount yesterday. I'm happy with the design, just needs to be tweaked a bit more. (don't judge the bilge, you'll be able to off it in a few weeks.)



Next updates: Laser cut motor mounts. Machine new stringer mounts.

Eric
enginerd is offline  
Reply With Quote
Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 07:08 PM.


Copyright 2011 OffShoreOnly. All rights reserved.