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Many thanks Codsy.

Still waiting for anyone who has successfully used Alum to tell us the ratio of alum to water? Thanks in advance.

I have never heard of using Alum to dissolve a broken tap. What amount of Alum is mixed to water for the best results?

I mean depth of cut for each stroke!

The brass stem engages in a slot in the steel ram. The cutter was made from 8mm silver steel. Machined on the mill and hardened and tempered. The amount of stroke was about 0.001" each time. The slot was 2mm wide by 1mm deep in medium carbon steel.

Thanks to all that have commented on the bearing debate. Very interesting comments. My engine is progressing slowly, currently making the Maniton shaft and crankshaft. I was pleased how my slot attachment worked. My intention is to screw the crankshaft into the crank and Loctite. Hopefully this...

Sorry here is what you want.

Here is a spare one I made that needs finishing off.

Yes, grease getting flushed out by fuel mixture was also my thought. I may remove the shields in time. More photos of my build to date.

Yes the bore is 11.7 mm dia. It has glow plugs which are machined down in size. 8 plugs takes a lot of power. My Brother made a power supply, so it delivered the correct power to the plugs. So in my case I can discount that. The rings were machined to size then cut with good side cutters. Then...

Please find attached photo of my completed 10.6 cc v8 aero engine. About 600 parts in total. Still have not got it to run yet due to lack of compression. I suspect the valve springs to be too light. Will change these some time. If that dues not work I will remake the pistons with more metal on...

Attached are some photos of 1/4 scale my master rod assembly. One can see the difference in construction. I chose to use shielded bearings which I hope will be OK. Regarding the involute springs you used , do you have the specifications on these. That would be very helpful. I have obtained...

I intend to stay true to the Blackmore design apart from the valve springs! There seem to be many others who have opted not to make their own from flat spring steel. This looks like a hit and miss affair getting the hardening correct. Tapered coil springs still look right in this engine.

I am also building a BR2 but based in the Blackmore design. I also first modelled the assembly in CAD as there are so many dimensional errors in he Book. I have completed the crankcase, cambox ,thrustbox, nose piece and currently making the con rods. I would be very interested in finding out...