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Need help on finding a motor for a 20' barrelback

Posted: Mon Feb 18, 2019 12:54 pm
by DavO
I am getting near the point where I will be finished with the bottom planking, and will want to drill a hole for the propeller shaft and rudder. Trying to gather suggestions from across several posts, I believe that I should have a motor picked out so that I can properly position the holes. I would like a V6 engine that is in very good condition (rebuilt is fine, but needs to be relatively new-ish). I have gone to sites like michiganmotors, but they do not seem to be selling turnkey V6 inboards any longer. Does anyone know of a place I can go for assistance? I am willing to pay extra if it means a simpler and more reliable motor installation.

Re: Need help on finding a motor for a 20' barrelback

Posted: Wed Feb 20, 2019 7:11 am
by hoodman
It should be fairly easy to find a 4.3l Mercury inboard. Although, it doesn't appear that they sell them new anymore.

Re: Need help on finding a motor for a 20' barrelback

Posted: Wed Feb 20, 2019 8:48 am
by PeterG
Try contacting Doug Russell marine, they seem to have everything you might need. www.dougrussell.com

Re: Need help on finding a motor for a 20' barrelback

Posted: Wed Feb 20, 2019 11:15 am
by Jimbob
Check with Michigan Motorz again. They can probably set you up with what you want. When I got my new v6 mercruiser from them, they only had the i/o version. They converted it into the inboard version that included the velvet drive transmission. If you want a v6, you will probably only find it in an i/o configuration. I went with the v6 because it is plenty of power for the dull design of the barrelback, and is shorter in length than the v8 motor, for an easier fit.
Jim

Re: Need help on finding a motor for a 20' barrelback

Posted: Thu Feb 21, 2019 7:33 am
by DavO
Thanks for everyone's help.

I spoke with Michiganmotorz again, and they do have the exact solution that Jim mentioned - thanks for the help! Jim, I assume that if you had to do it again, you would make the same decision with the carburetor V6? Of course having extra horse power/torque to take off sounds like fun, and I do like the modern fuel-injected V8 engines, but the extra room that the V6 provides seems to be the greater advantage. I wonder if I would even recognize the extra power?

Re: Need help on finding a motor for a 20' barrelback

Posted: Thu Feb 21, 2019 9:09 am
by Roberta
The V6 should be just fine for the Barrel Back. These boats with the flat bottoms were never meant for high speeds. If Michigan motors can build one with fuel injection, you might want to consider that option. The newer V6 engines have the horsepower that the older V8 had. Enjoy.

Roberta

Re: Need help on finding a motor for a 20' barrelback

Posted: Thu Feb 21, 2019 9:50 am
by Jimbob
One of the advantages of the fuel injection over the carburetor is that it will adjust for different altitudes and it's easier to start in cold weather. I live in sacramento with elevation less than 1000 ft. Lake Tahoe is about 5000 ft. (I will be going there also). At the higher altitude you will loose about 20% power with the carburetor version. The fuel injection can adjust for the altitude. If you are changing altitudes, you might consider the fuel injection system. It also is supposed to get better mileage. The mechanics here at work (new car dealership) all recommend the fuel injection system. If I remember correctly, the height of the fuel injected engine is slightly lower that the carburetor version. I ended up with the MPI version v6 mercruiser.
Jim

Re: Need help on finding a motor for a 20' barrelback

Posted: Thu Feb 21, 2019 4:13 pm
by Hercdrvr
I too like the idea of a V6 in the BB, 190hp vs 250hp, who cares? we’re not winning any drag races either way.
Most V6’s are I/O setups. Finding a bell housing for the V6 is what’s needed. Here’s what I found.
Carb vs Fuelie, depends on your skill set I guess, Electrical is my weak area so I’ll take a carb. Jim has a valid point about altitude changes. The fuelie will adjust AFR while the carb will not and run rich. Carb could easily be jetted to make same power as the fuelie at any altitude, it’s the drastic change the carb can’t handle.
My 351 engine decision came down to giving up 4.5 inches to save money and keep it simple... and I’m a Motörhead, someday when the water is glass and running next to a V6 BB on the Tennesseee River that extra 3 mph makes all the difference for my ego.
Matt B

Re: Need help on finding a motor for a 20' barrelback

Posted: Thu Feb 21, 2019 6:46 pm
by kens
Before you get all wound up on a fuel injected V6, may I present my own experience with a V6. Some years ago I saw the Mercruiser booth at the new boat show, and they had a EFI V6 on display. I never saw so many sensors, indicators, whatever, plumbing, wiring, etc., etc. all over the engine. It was covered up with so much electronic 'stuff' that it even looked 'heavy'. I dug into the specs on it and sure enough it was heavier than its carbureted cousin, by a lot. For what it is worth to me, there is no advantage to all the electronic gee-gaws if it comes out heavier.
If it's heavier, then it takes more power to push it, and there goes your EFI advantage.

The real advantage you could get over some old used engine, is to select a carbureted one with true GM VORTEC heads and factory roller cam. This production series engines came about in the mid-to-late '90's (in cars). I don't know exactly when it was standardized in marine applications. Funny thing that EFI came about around the same time as Vortec. So, dont get all wound up about EFI, when it is really the roller cam and Vortec heads that gets you where you want to be, plus it's lighter if its carbed.

What are Vortec heads? They are factory produced high flowing heads, cast iron. Years gone by in the street racing world, there was GM high flow heads you could buy over the counter as 'GM Performance' parts. The Vortec is a version of the high performance heads produced out of the factory.
It is standard on new production engines, but on a used engine, you have to verify.

Re: Need help on finding a motor for a 20' barrelback

Posted: Thu Feb 21, 2019 7:07 pm
by kens
here you go, scroll down and see the MPI as 70lbs heavier
https://www.michiganmotorz.com/complete ... p-244.html