Author Topic: Longboy's "SIDE SHAFTER" Model Engine  (Read 3222 times)

Offline Longboy

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Longboy's "SIDE SHAFTER" Model Engine
« on: May 29, 2020, 03:51:48 AM »
If you look up "side shaft engine" on the internet, you get all your contemporary snow blower and rototiller utility engines displayed. For antique engines, the term refers to an external shaft driven by the crank to operate the valvetrain, provide ignition, drive a lube pump or engage a speed control governor.

  :thinking:  :thinking:  :thinking:  What if you laid out the crankshaft  to the side from a bank of vertical cylinders of a gas engine?



Longboy's "Side Shafter" engine.......... starting this weekend!   :)


Wadda you mean, "It don't run"???

Offline Longboy

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Re: Longboy's "SIDE SHAFTER" Model Engine
« Reply #1 on: May 30, 2020, 08:55:58 PM »
A 4x4 inch aluminum angle piece gets cut back to a 3x4 inch piece as the main component in SIDE SHAFTER's frame.


In the vertical leg of the angle stock the web stub shafts will reside. The cylinders get the horizontal top side. Boring for the web shaft brass bearing carriers here.



Cylinder deck boring shown from a previous engine. The cylinder liners extend below the horizontal deck with their radiators sitting on the top and bolted down to the deck. A one inch bore to a 1.125 in. stroke for SIDE SHAFTER.

« Last Edit: May 31, 2020, 08:39:44 PM by Longboy »
Wadda you mean, "It don't run"???

Online crueby

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Re: Longboy's "SIDE SHAFTER" Model Engine
« Reply #2 on: May 30, 2020, 09:24:49 PM »
Looks like another fun project taking shape!

 :popcorn: :popcorn: :popcorn:

Offline Longboy

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Re: Longboy's "SIDE SHAFTER" Model Engine
« Reply #3 on: June 01, 2020, 07:47:09 PM »
The brass bearing carriers installed for the crank webs. On each outboard end of the vertical face, a pair of aluminum blocks with their brass carriers for the crankshaft mount up to the framework.



I ordered some thin wall half inch long Oilite bushings for all the bearing carriers. Seemed like they would do the job! Not quite what I expected. Too much play.....they were not going to work for the kind of drive I'm using for SIDE SHAFTER. Seems like the internal clearance of these bushings to the shaft is just way too much. Not critical for the main shaft when spread out 8 inches from each other but for the stub shafts, they had to go. No shaft rocking in their carrier.   :disagree:



I replaced them all with R1810ZZ rollers, main shaft too......and the problem went away! There is no thrust movement in the stub shafts. Spacers and retainers for the stub shafts on each side of the carriers ride on the inner bearing race.


« Last Edit: June 01, 2020, 07:50:57 PM by Longboy »
Wadda you mean, "It don't run"???

Offline Longboy

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Re: Longboy's "SIDE SHAFTER" Model Engine
« Reply #4 on: June 03, 2020, 06:07:50 AM »
Box sections at each end supports the main angle piece. A pair of 3/4 inch width angles and flat bar stock tied into the vertical and bearing carrier.



The frame is complete in five pieces! With the frame's main vertical as SIDE SHAFT's backbone, there will be no floor piece nor a longitudinal bar stock piece to complete another box with the main angle. Nor is there any need for bracing under the deck cantilever.



The bottom flat stock is cross slotted to give a positive lock in to the backbone with one 6-32 screw from the bottom. Some rubber feet will find their way to each end. Though it may look to be too short to support the cylinders, head and all its components without tipping to the left, to the right of the backbone go items to give a neutral left to right weight bias each side of the backbone.....such as the flywheel.
Wadda you mean, "It don't run"???

Offline Longboy

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Re: Longboy's "SIDE SHAFTER" Model Engine
« Reply #5 on: June 04, 2020, 04:49:02 PM »
Tecumseh points find themselves on on some flat stock and bolted to the bearing carrier block under the cam trigger on shaft to the inside of the frame member.





Automatic intake valves get their own assembly mounted to the cyl. head. 3/8 x 3/4 inch flat stock cage in the valve guides. Overlaid to each other with the o-ring seals and bolted together.



Some custom nuts for the four feet SIDE SHAFTER will dance upon.

Wadda you mean, "It don't run"???

Offline Longboy

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Re: Longboy's "SIDE SHAFTER" Model Engine
« Reply #6 on: June 06, 2020, 05:40:50 PM »
The radiators with their cyl. liners make the premier upon the deck of SIDE SHAFTER. Three 4-40 screws run up through the deck into the radiators and the liners protrude from the underside.  The bottom of the radiators are over bored for a gap between the liners, filled with epoxy to lock in the liners.



The crank webs get dressed with their Traxxas drive members. This part number fits on 1-3/4in. rounds, the webs are 12L14 steel.



And the webs are balanced to the piston/rod assemblies. A counterweight needed to be added to the backside to complete the primary balance. The 6-32 screws need blue thread locker.



The stub shafts are knurled and pressed into the webs....... and the assembly is complete.



Wadda you mean, "It don't run"???

Offline Admiral_dk

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Re: Longboy's "SIDE SHAFTER" Model Engine
« Reply #7 on: June 06, 2020, 08:51:04 PM »
Nice progress on a different design  :cheers:

Per

Offline Longboy

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Re: Longboy's "SIDE SHAFTER" Model Engine
« Reply #8 on: June 08, 2020, 09:03:00 PM »
Bringing the power strokes over to the crankshaft via the stub shafts are a pair of bevel gears. The drive being on the #4 cylinder as it is closest to the shaft bearing and carries the most load being the flywheel mounted.



Continuing the all star lineup of power distribution and allocation, cylinders 1 and 3 get some brass pulleys to turn the cooling fans. Now cylinder 2....was just too darn lazy to do anything for me!    :-\

Wadda you mean, "It don't run"???

Online crueby

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Re: Longboy's "SIDE SHAFTER" Model Engine
« Reply #9 on: June 08, 2020, 09:08:22 PM »
Watching along, great work!

Offline Longboy

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Re: Longboy's "SIDE SHAFTER" Model Engine
« Reply #10 on: June 10, 2020, 08:27:05 PM »
A single piece cylinder head is bored into about 5/16 inch depth on 2 inch centers.





And I got a line up match upon the cylinders!



Sixteen 4-40 SS socketheads will draw down on the radiators.



One spark plug and one ex. valve in the chamber. A tapered cut around the circumference of the chamber for the O-ring seal and a push rod hole out near the edge.



And on the top side some recessed boring for the rocker arm pedestals. At the sides, porting for in./ex. flow.



Wadda you mean, "It don't run"???

Offline Longboy

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Re: Longboy's "SIDE SHAFTER" Model Engine
« Reply #11 on: June 12, 2020, 06:10:31 PM »
All brass hardware to open up the exhaust valves.



With the holes and passage ways drilled in, a pattern milled across the head for the fins.







Wadda you mean, "It don't run"???

Offline Longboy

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Re: Longboy's "SIDE SHAFTER" Model Engine
« Reply #12 on: June 14, 2020, 03:37:11 PM »
Coming around the side of the rocker pedestal, the exhaust port to the outside.



SIDE SHAFTER will get a pair of brass, aluminum , copper mufflers. The brass tubes are end threaded to mount the mufflers and the tubes cross drilled to allow the gases to enter the copper canister.



Wadda you mean, "It don't run"???

Offline Longboy

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Re: Longboy's "SIDE SHAFTER" Model Engine
« Reply #13 on: June 16, 2020, 10:14:08 PM »
The camshaft on the cylinder side of the backbone. Three bearings, roller behind the sprocket guard and a pair of brass bushings along the length. Individual lobes will be slid upon the shaft and locked in place with set screws.



20/40T MXL sprockets for the drive.



A pair of 24T MOD .5 brass bevel gears bring the the drive over to the distributor. The distributor shaft rises at an angle through the backbone to clear the forward frame box section.

Wadda you mean, "It don't run"???

Offline gary.a.ayres

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Re: Longboy's "SIDE SHAFTER" Model Engine
« Reply #14 on: June 16, 2020, 10:34:17 PM »
Wow - some great work going on here.

Thos mufflers are so cute!

 

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