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Gordon, I attached a video of my PETG double acting engine on the Elmer’s gear thread, perhaps you didn’t see it? It is 100% printed with the exception of some stainless steel fasteners. Post processing included honing and fine sanding of sliding/moving parts, including the valve...

I printed an emergency gear for my Mini Mill in PETG and it not only let me complete the part I was working on during the crash, but continued in use until the new gear arrived. I waffled on the purchase of a belt drive due to price, and once I found I could keep my gear drive and insure...

That’s it exactly! Is there any way I can have that spreadsheet? I’ve been scouring the internet for the past couple days without success, and it’s been driving me mad! John W

Thanks for the advice! I’m just creating a 2 5/16” ball to upgrade a trailer hitch lock for a trailer parked in an unsupervised/vulnerable area and I’ve found the commercial units aren’t very tough. There may be other needs in the future, so I’ll probably just go ahead and build myself a ball...

I haven’t printed Elmer’s geared engine yet, but I did print and build this double acting engine that is completely plastic except for a couple fasteners. It runs well on as little as my breath, and the video shows it running on 5 psi. I downloaded the STL from Thingiverse and I can post the...

I can send you the STL files if you’d like. I left the mounting holes out and just drilled them according to Elmer’s plans. Drop me a message with email and I’ll send along both ring and spur. John W

I downloaded the CAD drawing from the website and imported it to CAD, and then exported to my 3D slicer. Printed it in PETG, but I’m going to re-print in PA6. It’s accurate as all get out and meshes with my printed spur gear perfectly. Best part? It costs pennies and is VERY easily duplicated...

I know I’ve seen a link to a spreadsheet to layout cuts on my manual lathe to rough out a ball, but I’ll be dammed if I can find one! I know Rick Sparber posted one using a graphing calculator, but I don’t have one, and this is for a one-off project, so I’m not interested in building a ball...

A wonderful touch added to an already superb bit of craftsmanship Basil!!! I’ve been wanting to buy a zinc chromate kit to give my carburetor parts that chromated yellowish tint. Have you looked at those? John W

No apologies necessary, as stated earlier, I love the experimentation aspect of engine design, and especially on something as unique as a gnome concept! I can’t wait to see what you’ll come up with and I’m looking forward to hearing you fire it up. John W

Really pretty engine, congrats on a nice runner! John W

I believe that for our model usage, simple is better, and the quality of the cast iron is more important than scientific temperature control. I make my own rings by turning them from the over-length skirt of the piston while still in the lathe (already at the correct diameter to fit the...

Excellent, 4 transfer ports should get the charge up into the cylinder adequately, especially since you're adding an active poppet valve. On typical motorcycle piston port engines, unless they're very low revving, more is better! the addition of that active exhaust valve will also negate the use...

Very interesting “work around” to enable a 2 stroke non-crankcase charged type of system. Will you run into any type of charge cutoff backflow with the rotary valving, ie. Hollow crankshaft to porting cutoff? Also, will there be multiple cylinder transfer ports to speed the flow of air/fuel...

A very beautiful model, congratulations! Perhaps the original exhaust was a wet system? That would quiet it down considerably. Basti, have you looked at the TIM6 ignition? I don’t think you can go wrong with using this and a Hall sensor for your engine. Here’s a link...

Looking good Bob! I’m looking forward to hearing the first ”pop”. John W

Looks good Bob. Tempting, but shipping is an SOB! It’d be a good one for in between the Pioneer and Atom V. Any word from Phillip yet regarding the Craftsmen Twin? John W

Interesting looking engine, many similarities to the Webster, especially the intake and exhaust valve position and action. John W

Both, and Stirling too I guess: https://www.youtube.com/@a41capt I’m currently finishing a non-compression engine that’s been on again/off again due to other things getting in the way! There’s lots of us engine guys here in AZ! John W

Welcome to the fun! I’m just over the hill from you in Camp Verde. John W