Hi All -
I was called in to do a recording session last week. The studio was next to a very small machine shop in north Denver. While on break, I saw a guy outside looking over what appeared to be a really small piston/rod assembly. Turns out he is in a club where they build exact replicas of vintage Offenhauser motors - but at quarter scale. He emailed me the attached pictures. They run on alchohol and litterally every piece is hand made. Pretty amaizing stuff.
He said one of the club members also built a quarter scale dyno - but that doesn't make sense to me - wouldn't measuring the HP be irrelevant to the size of the dyno?

Cool stuff.

#2

#3

Did you hear them running?

#4 - for scale.....

The nay sayers will say "why?".

Those that live life will say "why not?".

I appreciate their passion.

-pt

What kind of RPM they running? 9000+?

I honestly spoke to the guy for 5 minutes. He was just making parts - he emailed these pics over the weekend. He did say that one guys creation was pulling close to 40hp.
I just marvel at the time and precision.

Can you imagine tring to mill a quarter scale 914 block as a hobby?

You can't explain it to someone who doesn't get it.....

Great post and pix.

I don't knwo if it's still there, but at DIA (Denver Internation Airport), on the bridge between the main terminat and concourse A, there's an exhibit of miniature scale engines of all manner and kind. 24 cylinder radial motors, V8's, I4's, etc. All of them small enough to pick up with one hand... Amazing work, especially the fully functional 24 cylinder radial aircraft engine. Too cool!!

-Josh2

Build your own Offy motor !!!!


I've had these plans for about 5 years or so...still haven't made a darn thing for it, hahahha