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Rod's Hoglet

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Roderick Jenkins22/07/2022 15:23:44
2201 forum posts
616 photos

Just completed the cylinders as the first stage of my Hoglet build. Of course, I immediately deviated from the drawings and made mine out of FC steel rather than C.I.



EN1A is wonderful stuff


They are not quite identical surprise. I touched up the end of the parting tool after cutting the grooves on the first cylinder and because the tapered blade has a smidgen of top rake the grooves are a couple of thou narrower (and the fins correspondingly wider) on the second cylinder.


JasonB22/07/2022 18:50:55
23022 forum posts
2763 photos
1 articles

Off to a good start Rod, are you going to just do the basic engine or will you include the kick starter?

Roderick Jenkins23/07/2022 00:02:13
2201 forum posts
616 photos
Posted by JasonB on 22/07/2022 18:50:55:

... will you include the kick starter?

Not sure. I do like the idea of the engine being self contained rather than needing a drill to turn it over. I'll see.


Roderick Jenkins30/07/2022 20:39:52
2201 forum posts
616 photos

The heads are made from c.i. and I coordinate drilled the hold down holes and left a 20 thou spigot on the head to locate in the cylinder. I've never been much inclined to make jigs and fixtures but, especially with 2 of everything, it seems necessary.

For drilling the cylinder fins for the hold down studs to pass through it all needs to be located and solidly held.




The long 3/16" centre drill worked very nicely


The heads need holes drilled and milled at various angles so I made this fixture today. The aluminium square is Loctited and screwed to a 16mm steel spigot that fits in the ER25 collet block. The square is centered on the spigot and has a locating recess for the head so, in theory, I can put all the holes in the right place using the DRO in the mill, tilting the collet block in the vice as necessary.


Edited By Roderick Jenkins on 30/07/2022 20:42:24

Graham Sherwood 108/08/2022 10:52:39
5 forum posts

Good work Rod, looks spot on.

I am not too far behind you with my Hoglet build , I am finishing up the connecting rods then onto assembling the crankshaft then the bottom end is complete.

Like a lot of posts I see, I am not happy with the design method of a 'grab' fit of the crank webs to the shaft. I am planning using grub screws between the crank pin and webs to lock them, but cant decide on a method for the crank shafts to webs as after locking the pin there is no access. As a last resort I could just loctite them I guess, but not happy with this - Can I ask how did you do this assembly? Thanks

Roderick Jenkins09/08/2022 16:49:19
2201 forum posts
616 photos

Hi Graham,

You are actually well ahead of me - I started withe the cylinders and am currently wrestling with the heads. I started with material I had in stock while waiting for the other stuff to be delivered.

I share your concerns but am a great believer in Loctite. My Wyvern crankshaft is fabricated only with the aid of Loctite 603 and has stood the test of time. Only yesterday I was disassembling a 1/2" PGMS bar in a 1/2" reamed hole fastened with Loctite and it took a lot of heat and a lot of hammering.

All the best,


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