Closed Crankcase Hoglet

[errolf2]

I have just finished building a Closed Crankcase Hoglet. I have used aluminium for the build with steel liners in the cylinders.
Building the crankshaft was the most challenging and getting it to run true, I turned the crankpin down to 5/16 on each end and threaded it and pressed it into the 4''x 1/2 discs using lock nuts to secure it. The main bearings are screwed into the centre of the discs and then I tur ned them down to 10mmm as a unit .
The main bearings are single row roller bearings. I have used an O ring and a steel piston ring, it compression test at 160 psi
after the usual first start difficulties I have got it to run reasonably smoothly.


View attachment 108594

 

[Hopper]

Very nice.
How are you venting that closed crankcase? Is it the brass fitting sticking out in front?

 

[errolf2]

Good morning Hopper ,
Thanks for your comments,
The brass fitting is the vent , when I first ran the engine it expelled copious drops of oil out of the vent holes so I put a piece of scotchbrite wool inside the cap covering the vent holes and this solved the problem

 

[Johno1958]

Very nice and that fuel tank really sets it off.
Cheers
John

 

[Rudy from Norway]

Very Nice! Looks more authentic with that crank case. Grats!
Rudy

 

[errolf2]

Very nice and that fuel tank really sets it off.
Cheers
John

Thanks for your comments I think the brass and copper bling enhance the engine!
Errol

 

[errolf2]

Very Nice! Looks more authentic with that crank case. Grats!
Rudy

I thought of milling the crank case and relieving around the crank case studs but chose not to due to the small size of my rotary table.
Errol

 

[Rudy from Norway]

I assume you now put some oil in the crank case? The original design has no oiling and therefore not suitable for doing work, as it is stated in the drawings.
I have the plans my selves and i'm considering building it. I have also been looking towards another crank case design.
Rudy

 

[errolf2]

Hi Rudy,
Yes I am running 5w20 synthetic oil,
The engine is=s 36cc so it is capable of useful work , however without strengthening of the con rods and crankpin I think its life would be short lived,
Thanks for your interest
Errol

 

[Brian Rupnow]

Beautiful work on that engine. A real eye pleaser. I hope it runs as good as it looks.---Brian

 

[editor123]

Hi Rudy,
Yes I am running 5w20 synthetic oil,
The engine is=s 36cc so it is capable of useful work , however without strengthening of the con rods and crankpin I think its life would be short lived,
Thanks for your interest
Errol

Nah. The original Hoglet built by Randy is still running. He also built a HOGLET using Briggs and Stratton cylinders and then mounted the engine in a Harley Sportster frame. He rode it around the WEME show. It had an open case and open gearbox. Ran fine. Note that his Open Six/Four/eight/twelve engines run with no oiling systems and they run a long time.

 

[errolf2]

Thanks Brian,
It runs pretty good I haven't worked out how to post a video as yet
Regards
Errol

 

[lantain1982]

Sorry Team members,
Disregard this blank space. It reflects a bit of old age.

 

[Cogsy]

Thanks Brian,
It runs pretty good I haven't worked out how to post a video as yet
Regards
Errol

The easiest way is to upload it to youtube and simply paste a link into a post. It should then show up in your post.