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Member postings for Ron Laden

Here is a list of all the postings Ron Laden has made in our forums. Click on a thread name to jump to the thread.

Thread: Ron's Jowitt Popett Valve Engine
28/03/2020 17:35:51

I should have read your thread Jason, I see the drawings for the Entablature are spread over a number of magazines and I dont take ME, thats ok will look for something else.

28/03/2020 09:22:03

Jason, I have been thinking that maybe I should get another engine under my belt before venturing into a hit and miss so once the Jowitt is finished I am going to have a go at your Muncaster,s Entablature Engine.

I do think it a handsome engine and I think I will be ok with it, the only thing is I dont take ME only MEW. I will obviously need the drawing set are they ordered through ME.?


28/03/2020 08:16:21

Thanks Jason, I will carry on just hope I havnt gone too deep at 19.2mm, I see yours is ok at 19.44.

One thing I meant to ask, is there any danger of the bottom of the piston touching the cylinder wall when fitted with just the top ring. It crossed my mind as if it did mine would be alu to alu but looking at your picture yours doesnt appear to have done that.

28/03/2020 07:30:37

Morning Jason

I have hit a problem or at least I think I have, yesterday I honed the cylinder and managed a good finish from end to end. This morning I thought I would try the piston with the two O rings fitted to see how it was looking but it was way too tight. I checked the dimensions, the cylinder is 24mm at the crank end and 23.99 at the other, the piston is 23.95. The O ring grooves were spot on as per the drawing 19.4 dia and 2.6 wide and the O rings are to the size recommended.

I removed the lower ring just leaving the top one and it was a bit easier but still too tight. I bit the bullet and reduced the ring groove from 19.4 to 19.3 and it was a bit easier but still too tight so took the grove down to 19.2 and easier still and thats where I am now. Having no experience of this I dont quite know what fit I should be looking for with O rings. I can slide the piston back and forth but there is some resistance which I would expect but is it too much..?

I watched your video a while back where you showed a piston slowly creeping down the cylinder under its own weight, cant remember if that was an O ring piston but if it was mine will not do that.

Can you advise what I should be looking for fit wise.


27/03/2020 15:43:51
Posted by Ron Laden on 27/03/2020 11:47:57:

A bit of an experiment that I hope will work, I have made a lap for honing the cylinder. I used a piece of wooden dowel on the little Muncaster cylinder which worked fine and I was going to do the same on the Jowitt but I have no suitable sized dowel or anything close other than metals.

So I have turned up a piece of 66 nylon to size and hope it will do the job, will let you know.


Well it worked fine, couldnt see why it wouldnt got a nice fit between the cylinder and piston I finished with 1200 grit so have a nice surface for the O rings to run on. I think I may well use nylon for any future cylinders.

27/03/2020 11:47:57

A bit of an experiment that I hope will work, I have made a lap for honing the cylinder. I used a piece of wooden dowel on the little Muncaster cylinder which worked fine and I was going to do the same on the Jowitt but I have no suitable sized dowel or anything close other than metals.

So I have turned up a piece of 66 nylon to size and hope it will do the job, will let you know.


Thread: Tom Senior light X Axis power feed
27/03/2020 08:12:07
Posted by Steviegtr on 27/03/2020 01:48:15:

My mention of the balance on the top pulley , using a magnet for a tacho was. The thought of a small circular magnet flying around at possibly 3000 rpm, could become unstable & want to fly off to Mars.


I did consider some means of fitting the magnet to my lathe and mill but found the one on the mill stays in place at max speed 2500rpm so I havnt bothered and they have never come off.

Thread: Ron's Jowitt Popett Valve Engine
26/03/2020 17:05:29

The flywheels complete the parts list, now the fun begins or at least I hope it does..smiley


Thread: Tom Senior light X Axis power feed
26/03/2020 13:21:06

I dont know what size of magnets come with the tacho you ordered but I fitted one to my SX2P mill and one to my lathe.

The supplied magnets with mine are 10mm dia x 2mm thick and weigh next to nothing, so small and lightweight it didnt even enter my head the need for a counter balance and both machines run as smooth as I could wish for.

Thread: Ron's Jowitt Popett Valve Engine
25/03/2020 20:47:23
Posted by JasonB on 27/02/2020 18:44:26:

Well they were off the shelf but you need to be looking on the right one, though as there are not many you could make up your own.

They are a smaller and taller hex than the usual mass produced ones, Polly models in the UK sell them but I go direct to the people they buy them from in Germany GHW

Thanks for the pointer Jason, I had some 2.5, 3 and 4mm nuts arrive today from Polly models and as you say smaller and taller hex and excellent quality they really look the part, miles better than the every day off the shelf type.

25/03/2020 18:35:10

Thanks Jason, understood.

25/03/2020 14:33:51
Posted by JasonB on 24/03/2020 18:48:50:

Ron, you will find more on "Home Model Engine Machinist" and "Model Engine Maker" forums.

Hi Jason, there is a thread running at the moment on HMEM of a Kerzel build but the guy is making changes and doing his version, there was a post from someone building a double size version but sounds as if he has just doubled the sizes on the original and not using the Julius drawings.

The guy doing his own thing has led me to a question (sorry) the original has a liner, piston and rings all in C/I but he was going with iron liner bronze piston and steel rings. Later in the thread he says he is now going with Viton X O rings which surprised me in an IC engine.

Anyway it led me to thinking is an aluminium un-lined cylinder possible in a IC hit and miss engine and if so what material for the piston and rings or is it best to stay with the C/I for all three.


25/03/2020 13:36:12

Should it be of interest I just phoned M-machine metals and they are still open for business at the moment and are hoping to stay open which is good news, I would assume if they are open other stockists may well be open to.

Edited By Ron Laden on 25/03/2020 13:40:46

25/03/2020 08:53:42

Thanks Jason

I am almost there parts wise, finished the oil cups and the flywheels have arrived so once machined parts are complete.



24/03/2020 16:40:54


I have read through the Kerzel drawings and build notes and I think I am quite happy with them, though I did note that Kerzel does not recommend the engine as a first time IC, I say I,m happy but I could be missing something of course.

I did a search this site but couldnt find anything on the forum here and wondered if any of the forum members have built one..?

If I go with the Kerzel I think I would go with the Julius doubled up 38mm version, its quite a good size (7 inch flywheels) but all possible on my lathe and mill. I just thought that I may as well be building the larger version as the smaller one or am I being a bit over ambitious.


23/03/2020 18:56:34

Thanks for the links and drawings Jason, I will have a good read through them.

Having had a quick look the doubled up 38mm Kerzel grabbed my attention as a good size but on first glance the drawings look a bit daunting though all the information is there of course.

23/03/2020 13:35:11

The order of my projects/builds has changed somewhat, my club have cancelled all track meeting dates until further notice. We can still use the track (minimum 2 people) at our discretion but I can see days when there would still be a number of people turning up and I dont fancy that. I can also see that this season at the track is lost or at best very late in the year before back to normal so the need to finish the class 22 loco does not have any real urgency about it.

So having enjoyed the little oscillator and enjoying the Jowitt even more when I have finished the Jowitt I am going to fit in a 3rd stationary build. I havnt decided on which engine yet but I do fancy having a go at a hit and miss which leads me to a question for Jason.

Jason, is there a basic hit and miss design that you can think of that size wise would fit my lathe and mill or one that maybe could be scaled to fit, also one that could be produced from bar stock would be good as I do enjoy making quite shapely parts from bar, the Jowitt cylinder for example.



23/03/2020 08:04:07

My take on an oil cup, not quite the sexy shape as on Jasons drawing but I am quite pleased with it. I shaped it by hand using files and emery.


22/03/2020 09:18:42

Playing catch up so was up bright and early and managed to get some more done. The cylinder end cover, a pair of eccentrics (need a finishing cut) made and fitted the small end bearing plus made and fitted the wrist pin end pads.

Only the oil cups and flywheels to do and I will have all the parts.smiley


20/03/2020 14:14:18

Thanks Jason, will get myself some.

I have a pair of Perseus flywheels on the way, Chris Gunn was good enough to sell me a pair. You probably know but Chris built 4 engines and had a fifth pair of wheels left over from a bulk buy.


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