Cutaway engine

[BMW Rider]

Thanks to John for the Honda engine he was generous enough to part with for this project.

I have a nephew who is quite keen about cars driving and all related things so wanted to help him learn a bit more about the workings of a gas engine. I picked this engine up a couple weeks ago and worked on it completely stripping it apart and cleaning it up. It's quite old and as such parts are nearly non-existent for it, so the prospect of repairing it to running condition was not possible. I figured a good way to turn it into a teaching tool was to make it into a cutaway model so the functions and sequences could be demonstrated. In the end, it was not much for actual machining work, mostly hacksaw and filing with a few intervals with a cutting disc grinder. A lot of time at the sandblasting cabinet cleaning up all the pieces and a few small fixes. The only direct investment was a can of spray paint and a new rope for the pull start. I fabricated a crank handle using the remains of the clutch hub and a bit of scrap metal.

I still want to build a nice base to mount it on. My nephew is quite eager to get his first lesson.

 

[YYCHM]

That's awesome! Nice work.

 

[CalgaryPT]

I'll say.....what a great job. You've got a good eye for visualizing how to do that. I like the red high-lites along the cut lines and the crank handle. Nicely done sir.

 

[DavidR8]

That is exceedingly cool! Well done.
As a kid I was always fascinated by cutaways of anything mechanical.
So cool!


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[Johnwa]

That doesn’t look like the same engine. It is way to clean!

 

[PeterT]

Very nice. I love cutaways. I think there is some discretionary art involved - opening up key areas, cutting delicate things flat, paint detailing... all that to expose underlying features or mechanisms & still keeping the assembly together. Well done.

 

[Chicken lights]

Very nice work!
I never really understood how a magneto works on one of those, other than it’s the same principle as a generator but completely different

Suck squeeze bang blow!!

 

[CalgaryPT]

Very nice work!
...it’s the same principle as [insert what my wife asked me to do] but completely different

That's pretty funny. I'm going to use that

 

[Chicken lights]

That's pretty funny. I'm going to use that

Just so long as when she catches you doing something you shouldn’t be...my name doesn’t get brought up

 

[DPittman]

Very good. I've always found cut away examples extremely helpful in understanding mechanical things. I've never been able to understand how they do the cut away so precisely tho?