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its the parallelism that matters and it looks like you've achieved that, well done !!!, the actual height can be anything with the cross head machined to match it, but I'm guessing you already know that !!! (as I've said before) the #9 is my favorite Stuart, and if you'd like to see plans for a...

Minh-Thanh, those "perfect conditions" are good enough for calculating loads required of a Diesel con-rod, required injection pressure, and anything else you can think about. "flash point" and "auto ignition" temperatures are both irrelevant for Diesel operation. so what's your point ? Pete.

(once again...) "Compression Pressure" and "Compression Ratio" aka "Volume Ratio" are NOT the same, the "compression ratio" is purely geometric and does not take into account thermodynamics, the actual "Pressure" after "Compression" is given by a much more complicated formula (because so much...

My "Hansen" Diesel has a stroke of 40mm, and a head space at TDC of 2mm, so ~20:1, diameter doesn't factor in, its that simple :-) !!! (technically its 42:2, but 40:2 is close enough for gov't work !)

As an admirer of Kozo Hiraoka's books I've been investigating how to do the drafting he does, many of his 3-D draftings appear to be 7-deg / 41-deg "dimetric" draftings, so I'm trying to do that for some of my engine designs you can get a better idea what "dimetric" drafting means at this...

"check drawing thrice, measure twice, cut once" :-) !!!

I absolutely admire your lapping tool and all that went into designing and making it :-) !!! (personally I only use corundum, never diamond, don't want truly indestructible abrasives in my shop)

Petertha, great research !!!, Trimble is *correct* in saying you want to *stress relieve* the ring to its new shape, but he is *incorrect* about the temperature, 1100-F is the correct temperature, if you go up to even 1200 you risk annealing the ring and it will be too soft. as Mike Rehmus...

I agree, IIUC automotive is mostly steel and steel, these things obviously can be made to work, so I think the reason we hobbyists tend to use grey-cast-iron when we can is that its more forgiving, CI is the only known metal that doesn't gall with itself and is somewhat self-lubricating, for us...

grey cast iron is not malleable, it does not deform, it breaks. There's only two ways I know of to make a grey cast iron ring, either the "hot" method of Trimble where a ring is machined to fit exactly in the bore and then spread and heated to set that new shape, or the "cold" method where you...

McMaster says "conforms to ASTM A247" but that standard covers everything from flake graphite to nodular graphite and everything in between, since they aren't being specific I would not touch the stuff, flake graphite is desired in our applications for its gall-resistance and self-lubricating...

Yup, that's the stuff (with "flake" graphite) !!! (stay away from "ductile iron", that's not the stuff, it has "nodular" graphite which does not have the same self-lubricating / non-galling properties we desire)

these are the dimensions for "medium" tension rings, less likely to break during installation, but still sufficient wall pressure for intake stroke (what I've always used) looks like doing this drawing has been good for me, because in my last set of rings I accidentally did a...

problem is "durabar" is more of a company name than an alloy specification, you need to know which of the many alloys they supply that you're considering, they do make a "gray cast iron" but that's not what you typically get on for example eBay.

The numerical part of the Trimble article is this bore 1.000 depth 0.043 (ie radial depth of ring, the piston groove has to be a little deeper) spread 0.150 these dimensions are scaled up or down linearly with your actual bore. these are the dimensions for a "medium" tension ring...

I would do that if a short forward-flow combustor proved impossible / infeasible, but we know that the JPX-240 had a short forward-flow combustor, so that's what I'd try first.

my next turbine will be made from a turbo-charger, using their radial-inflow turbine wheel, in particular I've been looking at the Borg-Warner EFR which has a light weight gamma-Titanium-Aluminide turbine rotor, an alloy that is being used in full size commercial jet engine turbines. Only...

I really like your turbo-jet powered toaster, did you ever see the Aussie turbo-jet powered beer-cooler ? :-) !!!

congrats on the progress, the #9 might be my favorite ! in my experience, surface finish when using boring bar in mill is result of tool bit cutting angles (you need to rotate the tool until it has a slight rake), and if the tip is not razor sharp then also depth of cut. counter-intuitively...

I've done lots of silver-brazing of stainless, you do NOT need black flux for this, and the black stuff isn't transparent like the white stuff is so you can't see what's happening, its really only for brazing tungsten-carbide tipped tools when done by automation, if you think you need it you're...