Barrelback 20 4.3 ltr

A forum for contacting other builders of Ken Hankinson designs. These designs are now a part of the Glen-L family.

Moderators: Bill Edmundson, billy c

Wefisurf
Posts: 11
Joined: Wed Jan 11, 2017 11:21 pm

Barrelback 20 4.3 ltr

Postby Wefisurf » Wed Jan 11, 2017 11:38 pm

Been searching for this answer...
Does anyone have any input on how this bowl will perform with this power plant? My boat is pretty much finished and I will post pictures once I learn how to on this form
I'm ready to pull the trigger on a 4.3 L Vortec MerCruiser but wanna make sure it's enough power

User avatar
hoodman
Posts: 1074
Joined: Thu Nov 10, 2011 8:48 am
Location: Lafayette, IN

Re: Barrelback 20 4.3 ltr

Postby hoodman » Thu Jan 12, 2017 10:11 am

Have you taken a look at this chart?

http://www.glen-l.com/how-fast/

User avatar
Bill Edmundson
Posts: 10446
Joined: Wed Nov 23, 2005 6:45 am
Location: Birmingham, AL, USA
Contact:

Re: Barrelback 20 4.3 ltr

Postby Bill Edmundson » Thu Jan 12, 2017 10:24 am

Also, remember when you use this speed chart, as HP goes up so does engine weight!

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

User avatar
Jimbob
Posts: 312
Joined: Thu Jul 25, 2013 1:07 pm
Location: Sacramento, CA

Re: Barrelback 20 4.3 ltr

Postby Jimbob » Thu Jan 12, 2017 11:58 am

I have decided to go with the 4.3l for my Barrelback.

I had a v8 5.7l 260hp in my 19.6 Wellcraft runabout, plenty of power, and the boat would go 55mph. I tweaked the motor up to 330 hp and the boat would go 70mpg. Changing the prop resulted in a "stump puller" boat or a high speed demon. Hull design and engine torque are other important factors to consider. Keep in mind that the hull design on the Barrelback has a top speed of 40mph. You can accomplish speed or power with prop pitch changes.

The 6cyl 4.3l is about 230hp. It's a v8 5.7l without the last two cylinders.
Here are my reasons for selecting the 4.3l:

The original boats were only about 130hp.
Most of the time I will be cruising between 15 - 25 mph, or less. I feel 230 hp is plenty for that.
I learned to ski behind a 40hp outboard, so 230hp should be be plenty to get my tired old ass up and out.
It will be easier to install in the boat because the engine is shorter and lighter.
It has better fuel economy than the v8.
I am going with the carburetor version of the 4.3l because I don't want all of the computer control stuff, and high pressure fuel lines. I won't be in high altitude most of the time (lake Tahoe) and found that the loss in power at high altitude was no big deal in my previous carburetored boat.
The 4.3l a good, reliable GM engine. The mechanics at work (automotive dealership) recommend the engine. One of the mechanics has twin 4.3l's in his boat, and he thinks they are great.

Jim
Jim Neeley
Building a Barrelback in Sacramento, CA

TAB
Posts: 60
Joined: Tue Aug 09, 2016 3:22 pm
Location: OR

Re: Barrelback 20 4.3 ltr

Postby TAB » Thu Jan 12, 2017 9:50 pm

it should be just fine. the only thing I would worry about is prop size if you were towing skiers. you might be stuck with a small prop and lower rpms.


there is no replacement for displacement. no boater has ever said I wish I had less power.

User avatar
Dave Grason
Posts: 3762
Joined: Wed Dec 24, 2003 5:19 am
Location: Nashville, Tn.

Re: Barrelback 20 4.3 ltr

Postby Dave Grason » Fri Jan 13, 2017 10:37 am

Of course, Ken Hankinson designed this boat and I remember talking to him about it along about 1999. In fact, it was before he turned over the designs to Glen-L. He emphatically said that he designed the boat specifically for a V-6 engine and nothing bigger. He went on to explain that the boat was small and light and, that to try and shoehorn anything bigger, would be to seriously overpower the boat. This was all not to mention it being a huge case of diminishing returns.

Besides, the GM Vortec V-6 can make tons of horsepower with a little work. It also runs on 87 octane in it's stock form.
Last edited by Dave Grason on Fri Jan 13, 2017 10:43 am, edited 1 time in total.
Isn't it amazing!! The person that never has the fortitude to pursue his own dreams, will be the first to try and discourage you from pursuing yours.

User avatar
hoodman
Posts: 1074
Joined: Thu Nov 10, 2011 8:48 am
Location: Lafayette, IN

Re: Barrelback 20 4.3 ltr

Postby hoodman » Fri Jan 13, 2017 10:42 am

V6 sound great with the right exhaust too.

User avatar
kens
Posts: 4445
Joined: Wed Nov 12, 2003 5:25 pm
Location: Coastal Georgia

Re: Barrelback 20 4.3 ltr

Postby kens » Sat Jan 14, 2017 6:45 am

It doesn't take a lot of power to run in the 30mph range, but you need the really bigger power to run north of 50mph.
V6 will easily put you in 25mph cruise, maybe 30 cruise and about 40 tops.
As speed goes up the HP needed goes up 4 times.
Oak is over rated, everything about it takes extra time; then it warps, splits or checks !!! :roll:

User avatar
Bill Edmundson
Posts: 10446
Joined: Wed Nov 23, 2005 6:45 am
Location: Birmingham, AL, USA
Contact:

Re: Barrelback 20 4.3 ltr

Postby Bill Edmundson » Sat Jan 14, 2017 8:10 am

My Tahoe is 20'-6". I run a 115 HP (125 HP metric) diesel. She does 38-39 mph WOT. It can cruise 34 MPH as long as you have fuel. We normally run in the mid 20s. It would take about 250 HP to get to 50 MPH. It does the Gathering trip to Chattanooga, about 70 miles round trip, on about 1/3 of a 26 gal. tank.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build


Return to “Hankinson designs”

Who is online

Users browsing this forum: No registered users and 3 guests