5 CC CI engine (and a bit of a Grump)

David,

I am about not only throw all my toys out of my pram, but the covers and .everything else.

I am following the construction series on the 5 cc CI engine which started in M.E. Vol 207 No 4411. After reading it all I could have done nothing. The reason is the machining instructions say “The first operation is bring the blocks square and to the external dimensions plus 0.5mm”. The second part of the series in No 4412 continues in the same vein. I still do not know ANY of the finished dimensions. So I have no way of starting the project until the end of September.

The only information I have is the scaling factor 1.266:1 over the ED 2.49 Racer engine it is derived from

Rgds

Okay guy's, take it easy - as they say in the Army 'Don't anticipate the word of command'

You know theres been a lot of criticism of late about content - when I think of the time that was spent in producing this it is little wonder people 'come back for more' and repeat the exercise - time is short and mines running out - I'm getting old too

Edited By Ramon Wilson on 06/09/2011 18:08:31

Edited By JasonB on 06/09/2011 18:36:35

Edited By ady on 06/09/2011 21:04:51

Edited By Clive Hartland on 06/09/2011 21:56:24

Edited By Ramon Wilson on 06/09/2011 22:32:02

When I saw Part 1 of your article in ME 4411 I wandered down to the local ‘Patica’ Hungarian for apothecary –Dispensing Chemist to you and me-. I secured 25 grams of Ether. Once I had done that I started to review my metal stocks. Aluminium enough but only 50mm thick but I have a chunk of 125mm thick but what it is I am not certain. My only problem may be the length of 35-40mm steel for the crank and cylinder liner. I will not start on a project until I have everything I will need under lock and key to stop it from going ‘walkabout’.

When you can find steel (which at the moment is as rare as hen’s teeth in Hungary) it tends to be what I would classify as for ‘Cattle pen fittings Only’. I was making a special bolt for an old Briggs and Stratton (all UNC and UNF, and not a Millimetre in sight). I machined a lump of 25mm which was going to be turned down to make the 3/8” bolt. I had reducer the diameter to about ¾” dia when the thing fell in half. A dirty great ‘flaw’ in the metal. That was NBG. Actually much of the old ex Russian army junk around here uses UNC/UNF. The Hungarians are a funny lot. My neighbour was grumbling about having to replace the hinges on his gate – until I oiled them.

Thanks for the drawings of the crankcase. Now I know what I will want

Otherwise its a good usable drawing, just hope nothing is lost in the graphic design department. Such as making the general arrangement just a fraction less than full size so it fits the ME page when it would still have fitted if the table and timing diagram were sqeezed up a bit.

Edited By JasonB on 07/09/2011 16:44:08