Notices
The Boating Forum

Cummins 4BTA mods

Old 05-10-2019, 01:35 PM
  #21  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Feb 2008
Location: Miller Place NY
Posts: 388
Received 204 Likes on 125 Posts
Default Cummins Test run

We started up the engines the other day on the shop floor to see how the raw water pumps do in the new location. Seems pretty good to me! Hope fully they fit. According to my measurements I should clear by 2 inches.
I had to post them on youtube, here are the links.



Old 05-10-2019, 04:21 PM
  #22  
Senior MemberCaptains Club Member
 
Join Date: Dec 2004
Location: Lower Bay in VA.
Posts: 6,056
Received 315 Likes on 176 Posts
Default

Originally Posted by boatmanmark View Post
I also love this engines. Fuel economy is out of this world. I average a total burn of 7 gal. per hour for the season cruising between 22 and 24 kts. I will keep you posted. When all set I am going to put those pumps on the classified board.

Say what ?? At what RPM ??
Nice job by the way .

Last edited by prowlersfish; 05-10-2019 at 04:33 PM.
Old 05-10-2019, 04:38 PM
  #23  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Feb 2008
Location: Miller Place NY
Posts: 388
Received 204 Likes on 125 Posts
Default

2300-2400.
Old 06-02-2019, 09:40 AM
  #24  
Senior Member
 
Join Date: Apr 2013
Location: Sandy Hook Area, NJ
Posts: 534
Received 221 Likes on 143 Posts
Default

Do you have the engines in the boat yet? I am looking forward to seeing these in the boat and running.
Old 06-02-2019, 09:49 AM
  #25  
Senior MemberCaptains Club Member
 
Join Date: Dec 2004
Location: Lower Bay in VA.
Posts: 6,056
Received 315 Likes on 176 Posts
Default

Originally Posted by boatmanmark View Post
2300-2400.
7GPH per engine I assume

Old 06-02-2019, 09:58 AM
  #26  
Senior Member
 
Join Date: Apr 2013
Location: Sandy Hook Area, NJ
Posts: 534
Received 221 Likes on 143 Posts
Default

I have 4bta's in a 16k pound, 24 degree deep vee Carolina Classic 28. I average 24 knots at 2600 rpm's and burn a little more than 8gph per engine.
Old 06-18-2019, 06:19 PM
  #27  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Feb 2008
Location: Miller Place NY
Posts: 388
Received 204 Likes on 125 Posts
Default

Engines are in and we have sea trialed her! The deck has to go back on and a few items on the punch list need to be taken care of but nothing big. I am very happy with how the engines fit in with the pumps out front. I did have to move the Racors from the front bulkhead to the rear and have to find a spot for the coolant overflow bottles but that is not a problem. I treated myself to some new valve covers to dress it up some. If anyone needs a couple of raw water pumps I have two with only 120 hours on them, but no impellers now. They had developed a set to them.

New valve covers port side

New valve covers stbd side

Stbd engine r/w pump clearance

Port engine r/w pump clearance

Engines in and aligned

Sitting pretty!
Old 06-18-2019, 11:11 PM
  #28  
Senior Member
 
Join Date: Mar 2017
Posts: 716
Received 182 Likes on 109 Posts
Default

You can use an oversized pump, just trim off every other vane on the impeller.
it doesn’t cut the flow in half, but does reduce it somewhat.
i put a seaboard pump on a low hp 6b and had enough extra water to run a baitwell.
Old 06-19-2019, 04:43 AM
  #29  
Senior Member
 
Join Date: Apr 2013
Location: Sandy Hook Area, NJ
Posts: 534
Received 221 Likes on 143 Posts
Default

The engines look great sitting in the boat. For relatively small diesels, they make a ton of torque. When running in big swells in the ocean, I never have to jockey the throttles, like with gas engines. Keep us posted on your performance.
Old 06-19-2019, 05:58 AM
  #30  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Feb 2008
Location: Miller Place NY
Posts: 388
Received 204 Likes on 125 Posts
Default

Originally Posted by nuffaredy View Post
You can use an oversized pump, just trim off every other vane on the impeller.
it doesn’t cut the flow in half, but does reduce it somewhat.
i put a seaboard pump on a low hp 6b and had enough extra water to run a baitwell.
While that pump is huge compared to the stock Sherwood, the way it is set up takes that into account. The Sherwood can pump up to 46 gpm at 3000 rpm. the normal set up on the Cat pump is up to 78 gpm at 2450 rpm. However, by putting in a half thickness cam, which is a stock part it cuts it down to about 56 gpm. By limiting the pump speed by using a slightly larger drive pulley brings it down to the pump max speed of 2350 or so and puts the max flow rate just above the stock Sherwood. The pump itself is about half what a Sherwood costs, has a great track record and I don't need to take the engine apart to work on it.
Old 02-16-2020, 03:50 PM
  #31  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Feb 2008
Location: Miller Place NY
Posts: 388
Received 204 Likes on 125 Posts
Default

Originally Posted by boatmanmark View Post
While that pump is huge compared to the stock Sherwood, the way it is set up takes that into account. The Sherwood can pump up to 46 gpm at 3000 rpm. the normal set up on the Cat pump is up to 78 gpm at 2450 rpm. However, by putting in a half thickness cam, which is a stock part it cuts it down to about 56 gpm. By limiting the pump speed by using a slightly larger drive pulley brings it down to the pump max speed of 2350 or so and puts the max flow rate just above the stock Sherwood. The pump itself is about half what a Sherwood costs, has a great track record and I don't need to take the engine apart to work on it.
A fellow member has the same boat and engines in Florida. He is currently installing the system and is just waiting for some parts to arrive. We have been emailing back and forth since he is installing them on the outboard side of each engine. He required a different mounting bracket since his engine mount was different so we came up with a two piece design. Moving the raw water pump out to the front from under the injection pump really helps. Besides he was at first looking for a new Sherwood and there was one, in Belgium, $1800! Pics attached of his progress. Considering making a kit for anyone with these engines or 6Bs.




Old 02-27-2020, 09:22 PM
  #32  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Feb 2008
Location: Miller Place NY
Posts: 388
Received 204 Likes on 125 Posts
Default

Update on fellow members new pump installation. Take note this was all test fit and installed with the engines in the boat, and outboard of each engine. He should have the starboard engine hooked up and running tomorrow. Say goodbye to Sherwood! he is pointing the fittings out the back, toward the engine. This way you need about 8-9" in front of the dampener to fit. But that would not allow you to pull the impeller without taking the pump off. Still its easier than pulling the sherwood. And with a half cam turning at a slower speed this impeller should last a long time.



Pump lined up

Belt tensioned and fittings going on.
Old 02-28-2020, 04:50 AM
  #33  
Senior MemberCaptains Club Member
 
Join Date: Nov 2001
Location: Charleston, SC, USA!
Posts: 2,373
Received 109 Likes on 82 Posts
Default

Nice work!
Old 02-28-2020, 05:20 AM
  #34  
Admirals Club Admiral's Club Member
 
Join Date: Apr 2006
Location: Morehead City, NC
Posts: 1,535
Received 119 Likes on 71 Posts
Default

Looks great. But you got to have enough room in front of the engines. I've seen some engines so tight that I'm not sure you would have room.
Old 02-29-2020, 09:48 AM
  #35  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Feb 2008
Location: Miller Place NY
Posts: 388
Received 204 Likes on 125 Posts
Default

Originally Posted by buzzk View Post
Looks great. But you got to have enough room in front of the engines. I've seen some engines so tight that I'm not sure you would have room.
Thanks, you need a minimum of 8 inches in front of the dampener to mount it, but you would have to take it off to change the impeller. Still better than what is needed now!
Old 02-29-2020, 09:51 AM
  #36  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Feb 2008
Location: Miller Place NY
Posts: 388
Received 204 Likes on 125 Posts
Default

Here is the latest from another install, done in the boat! The bracket is modified from mine because of different mounts and location. But the end result is great. The small hose on the output side of the pump is for a water pressure sensor. I used the suction side for a small hose to help suck the bilge dry.



Old 02-29-2020, 09:55 AM
  #37  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Feb 2008
Location: Miller Place NY
Posts: 388
Received 204 Likes on 125 Posts
Default

Here's a question, would anyone be interested in a kit to do this?
Old 02-29-2020, 10:57 AM
  #38  
Senior MemberCaptains Club Member
 
Join Date: Dec 2004
Location: Lower Bay in VA.
Posts: 6,056
Received 315 Likes on 176 Posts
Default

Originally Posted by boatmanmark View Post
Here's a question, would anyone be interested in a kit to do this?

I bet some will . My self will stick to a gear driven pump . And yes Sherwood .

Very nice workmanship I will add.

Last edited by prowlersfish; 02-29-2020 at 03:02 PM.

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 Off
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.