Inboard outboard air cooled engine

[maxum247]

Re: Inboard outboard air cooled engine

Got the engine off the old mower frame tonight after work, moved the "SHAKER" into the garage. Seems like the proper name! And did a test fit of the 12hp Briggs.
She's a tight fit, just enough room to get to the spark plug to change it. Looks like it might sit about level with the top of the stern. Took a few pictures so you could see the boat and get an idea what the engine is going to look like in place. The easy part is done, time to get serious and figure the alignment of the engine shaft to the lower unit, and bolt locations to bolt the engine down.

 

[drewmitch44]

Re: Inboard outboard air cooled engine

Any updates? Im pretty interested as to how this thing turns out. You should start a project on shareaproject.

 

[Lone Duck]

Re: Inboard outboard air cooled engine

Looking good so far. Damn! Wish I was there with you. THe next time someone wants to put an air cooled engine in a boat, consider an Onan engine, Like the ones the use for generators in motor homes, or welders ,high pressure washers etc; It would be a shaft drive though. The reason I say this is because I used to rebuild them. With the opposed cyl. They run with less vibration than any small engine I have ever seen. I have started them up on a steel bench with out even clamping them down. Didn't mean to change the subject. Back to the briggs. Would it be possible to connect the lu with a lovejoy cupeling? Just thinking of future repairs.

 

[maxum247]

Re: Inboard outboard air cooled engine

Got a hole through the bottom, next step is deciding the height at which the lower unit will sit under the boat. This will depend on the distance between the shaft height of the lower unit and where the crankshaft will meet inside the boat. Trying to keep the engine height about level with the stern height. There are a few ways I can mount this set up, I've decided to mount the lower unit through the bottom of the boat, now just have to decide how I'm going to fasten it to the bottom. Thought of several ways to do this, haven't decided which one! Here are a few pictures! Idea's welcome!

 

[maxum247]

Re: Inboard outboard air cooled engine

I exspect to take a shaking from this thing, thought about mounting the motor on some sort of rubber mounts! About the coupling, how does it work?

 

[Lone Duck]

Re: Inboard outboard air cooled engine

Lovejoy coupling; Mabey you have a different name for it in your country. It is basically two hubs with 5 or 6 notches in them with a solid rubber notched ring in between. The alignment is not a critical this way. and it acts as a shock absorber. Could you put your unit together out of the boat and cut the hole bigger in the bottom so that everything is bolted to the top of the box instead of the bottom of the boat?

 

[Lone Duck]

Re: Inboard outboard air cooled engine

Lone Duck Lovejoy coupling; Mabey you have a different name for it in your country. It is basically two hubs with 5 or 6 notches in them with a solid rubber notched ring in between. The alignment is not a critical this way. and it acts as a shock absorber. Could you put your unit together out of the boat and cut the hole bigger in the bottom so that everything is bolted to the top of the box instead of the bottom of the boat?

 

[Lone Duck]

Re: Inboard outboard air cooled engine

Lovejoy coupling;
maybe you have a different name for it. It is basically two hubs with 5 or 6 notches in them with a solid rubber notched ring that fits in between them. The alignment is not as critical this way and it acts as a shock absorber. Could you put your unit together out of the boat bolted to the engine through the top of the box ? then cut the hole a little bigger in the hull? Then build a wooden steady plate where lu passes through the hull? I am sorry if this comes up twice, The first time it went to reviews some how.

 

[Lone Duck]

Re: Inboard outboard air cooled engine

Love joy coupling?
It is basically two metal hubs with notches in them with a solid notched rubber between them alignment is not quite as critical and it also acts as a shock absorber. Could you build the unit out of the boat? Everything bolted together through the top of the box? Then a wooden steady plate in bottom of the box and a little bigger hole in the hull instead of bolting through the hull?

 

[drewmitch44]

Re: Inboard outboard air cooled engine

Love joy coupling?
It is basically two metal hubs with notches in them with a solid notched rubber between them alignment is not quite as critical and it also acts as a shock absorber. Could you build the unit out of the boat? Everything bolted together through the top of the box? Then a wooden steady plate in bottom of the box and a little bigger hole in the hull instead of bolting through the hull?

 

[maxum247]

Re: Inboard outboard air cooled engine

Did a little more work on the "SHAKER" tonight. Hopefully have the lower unit where it will sit and at the right height! May have to lower the unit down under the bottom some more, all depends on how high the motor sits in the boat this way. Would like to keep it where it is, to avoid as much drag as possible, I know this design invites drag but it will be sanded and shaped more than it is at this point when finished. Not looking to plane the boat out, but if it does that will be fine! I'll see what happens! Things are subject to change on a project like this. One thing will work, but the other may not. In the pictures you can see how I've decided to mount the unit, other than paying someone to weld up mounting plates this is the next best solution I came up with. The gaps in each end are key ways designed to receive wooden keys that have a bevel on them so the key won't work out. Once in place there are four bolts that go through the mount to the inside through backing plates to give strength to the bottom and support the unit. When the bolts are tightened this will put clamping pressure on the keyways to hold them in place also. Parts will be coated with 4200 to give more strength and help prevent leaks and this will enable me to get it apart easier if I need to.

 

[Lone Duck]

Re: Inboard outboard air cooled engine

Looking fine.

 

[maxum247]

Re: Inboard outboard air cooled engine

My dad built a glass tunnel in a large flat bottomed skiff for a neighbor back in the 70's. It was neat to look down and see the bottom, on a clear day.
Dory boats here use the outboard tunnel, where they hang an outboard thru a tunnel when launching into the surf to run there nets out into the ocean. I can't seem to hold interest in that design, just not for me I guess!
The old method of a keel on the bottom of a boat inspired this idea for me. Take the keel away put a shaft down through the bottom of the boat, just something I've been wanting to try!
The coupler that I'm use to is called a steering coupler from an automobile, simuliar, but not the same. Until next time!

 

[Don S]

Re: Inboard outboard air cooled engine

So, after you make this thing out of old outboard parts, with wood that will rot, parts that are not replaceable, and that is hard to trailer, can't be retracted to get out of shallow water, veeeeeeerrrrrrrryyyyy slow, and NOISY, will overheat if you try to cover it with sound proofing, and sounds like a lawn mower, what exactly do you have in mind for it ??????????

 

[maxum247]

Re: Inboard outboard air cooled engine

I have a bunk made up with rolls that sits in the back of my truck, and am going to mount a winch to one side of the bed. Had one set up like this on my other truck and it worked fine, no trailer needed. Back down the ramp, haul the boat up, tie it down. The unit stops short of the tailgate, so no problems there! As far as the shallow water,that could be a problem!
Slow is not bad, I enjoy trolling along waiting for that big fish to bite! When I want to go fast I break out the center console and let it rip!
Don't plan to cover or sound proof the engine, the only thing on top will be a guard to keep me from putting my hand on the rotating screen' and that will be well vented.
Noisy yes! Some of the fishermen in my neighborhood used air cooled engines in there boats when I was a kid. To stand and watch one coming across the sound was excitment to me.
What do I have in mind for it? Quality time with my son.

 

[maxum247]

Re: Inboard outboard air cooled engine

Turned the boat upright the other night and am ready to start getting the alignment of the lower unit and engine height in order. Have decided to run the key switch to the front side of the seat as well as the throttle control. There's a little panel there that will be perfect to mount items like this. Will put everything in reach while steering with the tiller that I've decided to use.
Haven't decided what I'm going to do for the shifting mechanism yet, I'll figure something out as I go I guess!

 

[Lone Duck]

Re: Inboard outboard air cooled engine

Have at her. Quality time with son? PRICELESS!!!

 

[Don S]

Re: Inboard outboard air cooled engine

What do I have in mind for it? Quality time with my son.

Then it's a VERY worthwhile project. Lots of things will be learned and shared, even some things on the boat.
Have a great time with it.

 

[tashasdaddy]

Re: Inboard outboard air cooled engine

reverse=paddle.

 

[DJ]

Re: Inboard outboard air cooled engine

Reverse is possible, with that lower unit. However, the trick is whether or not that engine will allow shifting. I would think it would idle down low enough to allow the L/U to be disengaged and reengaged in a different gear.