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I've noticed this same issue related to tool cutter grinder wheels. I have tried clarifying with seller beforehand but replies can be just as or more confusing. Someone told me the substrate for diamond is always that brick brown color but that may not be reliable indicator because I've seen...

Very nice! Just out of curiosity, have you ever tried some of the low temp aluminum braze alloys? I was eyeing Harris AluxCore 98/2 which melts at abut 65% that of aluminum. Its 98% zinc so maybe its like the Miracle Magic rods shown when the circus comes to town LOL. My failed attempts at the...

The OP's post #1 parts layout looks to include spark plugs, not glow plugs. Which was going to be my question to @michael-au anyways - if indeed spark, what is the plan for ignition system? Nice parts btw!

@Foketry very nice work. Maybe I asked you this on another build, but what is your method for selecting / sourcing your casting aluminum? For example do you confine yourself to bars of a known, specific alloy for things like heads & cylinders where they have more complicated geometry like fins...

You seem eerily familiar. HaHa! Welcome to the forum!

At the risk of deepening the rabbit hole, I tried to find my prior posts showing charts of carb sizes for various model engine commercial offerings, but looks like the links are broke. Anyway, here they are in slightly modified form FWIW. The first 2 charts are overlay of Perry carb bodies...

You are exactly right, I should have read more carefully.

I routinely would have commercial RC fuel for over a year in both plastic jugs & metal cans with no detrimental effect to performance. As long as the lid is well sealed. Mind you, I live in a dry climate. Methanol is hydroscopic, so is nitromethane but I believe slightly less so. It is possible...

5/16" O-1 is $9.72 CAD at KBC Canada & they generally aren't considered the cheapest supplier. https://www.kbctools.ca/itemdetail/1-950-020

Very nice, pretty much what I was aiming to do eventually. So I assume you reamed the gear ID's for nice fit on the shaft, no need (or probably room) for bearings? I forgot to ask what is clearance between gear thickness & sandwiched pump body housing? When you made the teeth, do you check PD...

One good thing about having your air hooked up for leak-off testing, is you can turn the pressure down low & audibly hear your valve timing hissing & compare both cylinders apples to apples on the protractor wheel. You mentioned non-fire cylinder inlet is appears to be late 15-deg, how about...

Thanks & look forward to your pics. Hard to see, but are your teeth involute or something different? I'm lead to understand both equations show in bold on my spreadsheet assume involute FWIW. What do you figure your annular gear/cavity distance is? Any idea of discharge pressure (even rough...

I'm interested in the same thing. This was discussed on MEM forum where some spreadsheets were shown, some of which had more discreet control of input/output parameters, pump power requirements & such. But information was rather scattered about several individual engine build & pump related...

Nice. I don't want to deflect your build post into a casting discussion, but just curious what is the alloy source/recipe for that casting? Do you do anything in the way of post hardening / artificial aging? How would you describe it relative to say off the shelf 6061-T6 from the standpoint of...

Very nice engines. Welcome! Is the 4-cyl opposed a Satra 0-4-0 by chance? The blue inline 4 looks familiar, was it featured in a magazine? (Cirrus maybe?). Turbines are way above my pay grade but look forward to those pics too. You are very industrious.

Thanks. Maybe when you post your pics I'll be able to recognize some components. I built my 5-cyl radial with glow plugs because that was the design & my prior RC familiarity & arguably simpler, at least for me. But I'm now venturing into gasoline/spark ignition territory. Distributers still...

Very nice Cat! I'd like to know more about your Seal engine, particularly your comments about mods to carb & ignition system.

Welcome from the province next door. Look forward to some pictures. Your projects sound amazing.

Actually I must have been asleep at the switch with my sketch. The pushrods will only push 'up' to open the valves from what I assume is the present valve closed position, so the resultant pushrod angle wont be as exaggerated as I first showed. But the general guidance is the same. Its...

Just an opinion & maybe the picture angle is exaggerated, but I cant help but thinking the SH cap screws used on the rockers should be screwed in substantially towards the rocker. The pushrod would have to be a bit longer to accommodate, but it would mitigate that steep pushrod angle for the...