Search results

Hi All, when you're Googling and nothing comes up, you know your hobby is niche/cool!! 😂 I have been looking for online resources regarding the design of model 2-stroke engines (particularly CI 'diesel' engines) without much luck. @edholly put me on to some great site that allows you to...

She lives!! :) :) :) :) :cool::cool::cool::cool::p:p Very happy. It took a while to get used to operating a twin. To get started, I made sure each cylinder ran on its own without the other one attached. After I knew there were no issues with either, I put them both on and soon got it...

Hi all. Happy New Year! I finally had some time to continue with the twin build (in between mince pies and sherry etc) and can report some solid progress. I had a major setback in the autumn when I tried to assemble the crankcase and the two crankshafts in that they didn't fit together! I...

Thanks mate. Hope to have something to show for the effort soon!

Here's how i made the centre crankshaft. Not sure it works yet but really tried to be as accurate as possible turning between centres and being mindful of chuck runout etc. The only things I think could be improved on from accuracy point of view were the use of a 'live' centre vs dead centre...

OK so finally got a chance to move things forward. I was stalling on the tricky centre bearing and crankshaft parts as I had no idea of the right machining sequence. What then normally happens is that I procrastinate/prioritise other projects over getting in the workshop. I took the plunge and...

A quick little mod I’ve been meaning to do for ages is to get a drip oiler fitted to my 6” bandsaw. I took the plunge and had a good old rummage in the scrap bucket and came up with this. The oiler is one I got off ebay a few years back when it thought it could be used for the Webster engine...

I made mine without a mill (just the drill press). A mill definitely makes it easier but not essential. P

LJ, i strongly recommend having a look at Elmer's model steam engine plans. http://www.john-tom.com/html/ElmersEngines.html I made two of them when i was starting out and learned a lot! The engines look great, very forgiving on tolerances and, with enough air/steam, will mostly run. My first...

I normally do by ‘ear’ or feel. I think normally 1200rpm for the finishing cuts or something? Probably 600-700 for hocking out big chips on the high tensile steel. For that I use the gold steel inserts and seems to go ok but a rough surface finish.

welcome to the forum! Patrick

Oh and I think they have a 0.2mm radius at the tip. P

Hi Oli-Matti. Thanks for the comment. I experimented with some different carbide inserts and these seem to be the business! That surface finish was straight from the lathe (ok the cylinder muffs had a bit of 800grip applied mainly to remove the burrs beween the fins). They were Sumitomo CCGT...

Hi all, fast forward to the exciting bit. Over the last few weeks I have made almost all the parts that would be the same on a single cyl diesel so front, crankshaft, cylinder muffs, cylinder liners, conrods, venturi, compression screw, prop driver,.......... Now its on to the interesting bits...

Hi, bit of shed time today and managed to get the crank case done. Still some deburring to do etc but pretty happy with it. This was my first time using a boring head in the mill which turned out to be a surprisingly pleasant experience / my fears were unfounded. It was a cheap and cheerful...

Welcome aboard Peter (or at least out of the shadows) . Can't wait to see the Boll Aeros. Great little engines. I made two myself. I am addicted to the smell of Ether and castor oil :-) I have yet to see a garage with a car in it.... these are purpose-built workshops with big front-doors to get...

Hi Olli-Matti, looking forward to the challenge and hopefully have some plans to share at the end of it. P

Hi, as I was looking around for a next project, and keen to try a twin aero CI engine, I got chatting to @edholly who has an enviable collection of beautiful engines (and equally enviable petrol-head history that makes me very jealous). A plot was hatched to take the 'mud map' sketches of his...

Thanks Oli-Matti. Much appreciated On the lapping i used Silicone Carbide grit. Diamond grit (red) is recommended by some too but i always get worried that there is still some lingering about even after ultrasonic cleaning. Plus the carbide grit is super cheap so I will be sticking to that. In...

Thanks Ed, I'd love to give that a go. I'll have a think about the crankshaft/crankcase/bearing setup and post on a new thread. If you have any *** packet sketches they would be gratefully received. I was thinking opposed twin (simultaneous firing) rather than inline alternate firing twin as a...