Inboard outboard air cooled engine

[maxum247]

Re: Inboard outboard air cooled engine

Come out far enough before you 90, keep the pipe about 5" from air cleaner and engine.You want to dissapate the heat not burn air cleaner or heat the block up. Later after test you can build a shield out of lite expanded metal. Heh Heh we will keep you working on it for years if you follow all of this sage advice.

YEARS!

 

[maxum247]

Re: Inboard outboard air cooled engine

IMO, the long pipe alone should dissipate the heat some, it's not like the baffling of the muffler right up against the block (causing it to) or holding the heat in, and reverberating the noise inside. In fact, I think I would at least try it without a muffler on the end
1) So it's not as restrictive, with less heat build up
2) The pipe itself will change the tone, muffle it some, & take away a lot of the roar, (more like a pop, popping sound) it may not even be that loud as to require a muffler on the end,
But if it does, remember that the muffler will be of the straight thru type, again drawing away a lot of the heat, and restriction.

Wonder how it would work if I decided to run the pipe down the outside right into the water 2 to 4 inches?

 

[Scaaty]

Re: Inboard outboard air cooled engine

Let me chime back in here.
You are on the right track exhaust/tiller wise.
But I'm gonna toss a fork in the road on the motor.
I would take a big chuck out on the rear seat. Then mount (with wood, fiberglass, and angle iron) the motor forward in that pocket. Then a seat in front of that. You could even make doghouse..front vents, rear open..contain the noise? Then simple run 2 pulleys and a belt. This way you can change ratios later too if needed.
Either run a centrifugal on the motor, or an idler on a swivel, either foot or lever operated, for belt tension. Possible to rig up a shifter too, as that part might be still usable.
We are talking simple minibike parts here. I'll post a pic of a old dirtbike I put together after a blown motor, (I do have lots of steel and welders, so much easier for me)stuffed a B+S with a jack shaft. Just imagine pulleys instead of chain, and this part would be facing down in the boat, out of the way, but easy to get at. You would need some way to hold down the driveshaft though...run a couple angle iron back there, with 2 locking collers, couple brass washers greased as thrust bearings.
Its fun building stuff like this, aint it?

 

[maxum247]

Re: Inboard outboard air cooled engine

Hey! Good to here from you again! I had thoughts along those lines but things seemed to have taken the current direction. Had most of the parts I needed, so off I went! That old picture has been a great insperation, I think of it as I'm working on the project sometimes, makes me want to acheive the build even more! Yeah! It's great fun!

 

[Lone Duck]

Re: Inboard outboard air cooled engine

Scaaty
I was thinking something along the same lines with a belt. But instead of moving the engine , I was thinking about hanging the L U of the back then belts from the engine. But I saw he already had the L U positioned under the hull. Either way it is fun watching things take shape. But why the clutch?

 

[Scaaty]

Re: Inboard outboard air cooled engine

Good'nuff! Continue with plan "A"...
We can use my idea as plan "B"..as we are doing a "cheap as possible" here, with whats available.
I'll have to go back and re-read all the post. Seems on track so far.
That little boat of my dads was real simple. Fired, and off ya went. I would not get to complicated here. I would NOT worry much about any oil drain. I just have a Harbor Freight Suction gun (similar to a grease gun, only works reverse, just pull the handle. I stuff it in the oil fill hole, suck the old (I had to put a smaller diameter hose in the inside on the stock large one..). Suck it out, then fresh..good nuff. I have too many small motors, and aint pulled a plug in years. Have a 70 Snapper 5hp rider mower. Still runs STRONG..cuts foot grass, and maybe did a good drain 5 times, (like every 5 years!)
Exhaust...simple pipe..run it anyway ya want. Long pipe hurts nothing...probably add torque. We aint talking some high RPM motor here.
I been messing with stuff like this (minibikes/Karts) since 1960. at it 50 years now. ..I'm 57, soon 58. 7 bikes, 4 boats, motors everywhere. Ended up doing 21 years as a Maintenance Machinist..retired in 94 with a plant close down, and I had age and time in for the pension..yep, lucky!
I started a Harley Dragbike "Look a like" project a LONG time ago. 1991. Wanted to make it street-able though.
Started with a old Honda inline 4 "chopper" frame from the 70's. Sawed the whole back off, stuffed a Harley Sportster motor in, jack shaft, solid rear end, 220 car tire on a car rim. Polished both sides 'Centerline" aluminum rim, with home made hub's. 6 foot long chopper front end cut down, a rear wheel hub was spooled on a front wheel, as I needed the both sides of a rear Harley hub for dual disc brakes. Made all the brackets for mounting the brakes.
Good LORD, the THINKING needed! 1991..probably 4000 hours total, still needs fine tuning. I had to BUILD everything. Most stuff was not sold then, not like the bigshot loudmouths on TV now, that just bolt stuff together.
Out in the shop now on the laptop..I get back in the house, I'll do a pic of it. Kept it simple as possible, and cheap as possible.
And have a ball doing it.
I spend a LOT of time..wandering the aisles in Home Depot..just looking at stuff that can be used for anything but whats its intended more...gotta "tinker"!
And ya gotta think....the kid still involved in this project?...great learning ..stuff not taught in ANY school ..fun to get the old brain "smoking"..
I'll have to reread all this, but a quickie says don't worry to much on the drive...try what ya came up with...not a lot of "force" involved spinning a prop in water, as compared to "force" needed to drive some 200/300 pounds of metal and the also 200 pounds of the fat rear end connected to me, all going to a small tire patch. That breaks stuff .
Have fun with this....if needed, go ahead and PM me on any question. Ya want, toss ya a phone # too...be glad to help. Robby..(still at it, and refuse to grow up....(kinda like it when I crack up the neighbors when I come down the street (we are a private HOA waterfront)..on something like the latest dirtbike. Its only a 2hp now..maybe does 20mph tops. Damn kids come by and pass me on mini's, or Quads...laughing. Then I switch to one of my Harleys...track'em down! Lots of fun!
Have fun with this..

 

[MikDee]

Re: Inboard outboard air cooled engine

Gents, begging your pardon, You do have good suggestions, & idea's, at this time though, a lot of work, and planning, went into mounting the motor, & drive already, so as not to "change horses midstream" I think he should keep going forward at this point, and not interfere, but help him along with his design, as he's doing a good job. If it doesn't work out for any reason, he has gotten this far along, and has other options for later on down the road, (or down the river,,,lol).

maxum 1 1/4" O.D. should be standard 1" I.D. galvanized pipe.

And please don't put the exhuast under water, it just might hiccup, and suck water back into the motor and we don't want that!

 

[Lone Duck]

Re: Inboard outboard air cooled engine

Gents, begging your pardon, You do have good suggestions, & idea's, at this time though, a lot of work, and planning, went into mounting the motor, & drive already, so as not to "change horses midstream" I think he should keep going forward at this point, and not interfere, but help him along with his design, as he's doing a good job. If it doesn't work out for any reason, he has gotten this far along, and has other options for later on down the road, (or down the river,,,lol).

maxum 1 1/4" O.D. should be standard 1" I.D. galvanized pipe.

And please don't put the exhuast under water, it just might hiccup, and suck water back into the motor and we don't want that!

Oh yes don't change now. Belted engine can be done another time.

 

[MikDee]

Re: Inboard outboard air cooled engine

Hey Scaaty, I'd love to hang out around you, but you're on the left coast, you sound like Jesse James's Dad?! The cantankerous old mechanical genius! I can say old, because I got a few yrs on ya!,,, lol,,, How about giving this lad an idea for a cheap, easy, simple, tiller assembly.

 

[maxum247]

Re: Inboard outboard air cooled engine

I'm 45 still working, I manage a small office supply. Anyhow when I get off work it,s something totally different to do after pushing a pen for eight hours! It,s a great stress releiver to work on my projects. Most of the problem is I get a new one started before I can get the old one finished!

I've been tinkering since I was young, My first project as a kid was when I was about 12 I got hold of one of the Honda mini trail 50"s I think they were called, anyway took some rubber hose stretched the front end out a few inches made my first chopper, couldn't understand why the engine blew so quick! Had her up in the bow a little too high, didn't run too well without oil getting to the motor! I,ve had a few motorcycles, some ran some didn't, same with boats, had a couple Mustangs, a 69 Roadrunner with a 383, a 68 Torino Fastback, and a few others, my favorite was 1967 Ford Fairlane with a 289 that I finished restoreing as a daily driver! That thing was great, took it on a trip to Maine as a kid 16 hours up, 16 hours back never missed a lick!

None of these were high dollar projects just old and needed to be fixed up, seemed like a good deal to me!

 

[Lone Duck]

Re: Inboard outboard air cooled engine

Yeh my favorite project was a modle T ford chopped & channeld with a 350 stuck in it . By the way I'm 67 and still a kid.

 

[maxum247]

Re: Inboard outboard air cooled engine

Yeh my favorite project was a modle T ford chopped & channeld with a 350 stuck in it . By the way I'm 67 and still a kid.

We're gettin into some good stuff now!

 

[MikDee]

Re: Inboard outboard air cooled engine

I'm 45 still working, I manage a small office supply. Anyhow when I get off work it,s something totally different to do after pushing a pen for eight hours! It,s a great stress releiver to work on my projects. Most of the problem is I get a new one started before I can get the old one finished!

I've been tinkering since I was young, My first project as a kid was when I was about 12 I got hold of one of the Honda mini trail 50"s I think they were called, anyway took some rubber hose stretched the front end out a few inches made my first chopper, couldn't understand why the engine blew so quick! Had her up in the bow a little too high, didn't run too well without oil getting to the motor! I,ve had a few motorcycles, some ran some didn't, same with boats, had a couple Mustangs, a 69 Roadrunner with a 383, a 68 Torino Fastback, and a few others, my favorite was 1967 Ford Fairlane with a 289 that I finished restoreing as a daily driver! That thing was great, took it on a trip to Maine as a kid 16 hours up, 16 hours back never missed a lick!

None of these were high dollar projects just old and needed to be fixed up, seemed like a good deal to me!

Ahh, you're still a kid to me, but ya got moxie, more power to ya!

 

[rogerwa]

Re: Inboard outboard air cooled engine

I may have missed it in thei long thread butdid you block the exhaust port on the LU so that water will not just leak into your boat??

Also, you may want to shave off the skeg as that will probably be fighting the rudder. The leg itself will fight the rudder but the skeg is really unnecessary except for protection.

Just a thought..

 

[maxum247]

Re: Inboard outboard air cooled engine

I may have missed it in thei long thread butdid you block the exhaust port on the LU so that water will not just leak into your boat??

Also, you may want to shave off the skeg as that will probably be fighting the rudder. The leg itself will fight the rudder but the skeg is really unnecessary except for protection.

Just a thought..

The exhaust port has been removed and blocked off! Here's a picture of before and after.

Leg fighting the rudder, hadn,t thought of that!

I could take off a little bit of the skeg but the location of the drain plug is such that I would be afraid to try it!

 

[MikDee]

Re: Inboard outboard air cooled engine

I wouldn't worry about the skeg, I'm sure it might make a little difference, but most inboards have some type of skeg anyway, Shoot in fact, some of them have a big skeg, and some the skeg encloses the prop almost.

 

[Scaaty]

Re: Inboard outboard air cooled engine

Scaaty
I was thinking something along the same lines with a belt. But instead of moving the engine , I was thinking about hanging the L U of the back then belts from the engine. But I saw he already had the L U positioned under the hull. Either way it is fun watching things take shape. But why the clutch?

Well..(I think to much)...with a clutch, you can work the springs to give neutral at idle, and with just a touch of throttle, off ya go.

 

[Scaaty]

Re: Inboard outboard air cooled engine

Heres a pic of what I started (91) when I got a little too bored...lots of thinking on this one, but fun, and learned a LOT!

 

[Scaaty]

Re: Inboard outboard air cooled engine

I would recommend 3/4" galvanized pipe for the tiller, with a 90* elbow at the top, and sliced on the bottom to slip a rudder (of some type) in between than bolted thru, or welded on. They make sidewall pipe support loops, that attach to a small rectangular base with 2 holes in it (with a short piece of 3/8" threaded rod in between) to mount to the transom, to slip the tiller shaft into. You would need a 3/4" pipe coupling somewhere near the top, to hold the tiller assembly up off the transom, by resting on top of the upper pipe support, instead of going thru it.

Unless you have other idea's?

Run through the Electrical section at Home Depot. EMT (Conduit tubing) pipe clamps would work. Just shim out a bit with washers?

 

[Scaaty]

Re: Inboard outboard air cooled engine

Got a sore thumb, broke a small drill bit drilling the angle braces tonight, drove the bit right in the end of my thumb. I saw stars over that one for awhile!:redface:

Well, it happens on ever project, so at least its out of the way. Last year, I was rebuilding a trailer for a little Flatbottom Dragboat I was putting together. Building a whole new "truck", axles, springs, etc. Drilling 1/8 holes and holding something up behind (can't remember now) Went through a little to quick...drilled a nice hole middle finger right where the fingernail meets skin, off to the side a bit. Year ago, and I still have the fingernail growing all funny that side. MAN, that HURT!