[modeleng] Re: Valve Gear Modifications
- From: "BarriePurslow" <Barrie@xxxxxxxxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Sun, 5 Dec 2004 23:58:26 -0000
Ian,
I have seen several of these engines run using the original Winson bits -
O.K. they don't have four square beats but they do run. Therefore I suggest
that your engine has been incorrectly assembled somewhere along the line.
The following runs the risk of teaching granny to suck eggs but it's the
best I can think of:-
I suggest that first of all you check that the return cranks are correctly
set i.e. the big end of the eccentric rod is 90 degrees behind the crankpin
when running forward.
I then suggest that, working on one side of the engine at a time, you
connect rubber tubes to the draincocks and place their open ends in water.
Using the reverser set the radius rod in mid gear then rotate the wheels
until the combination lever and radius rod are at right angles. The piston
valve should now be in the middle of it's travel and you can check this by
applying a few psi of air to the engine and observing the submerged tubes. A
small leakage flow should come from each tube. Rocking the engine slightly
back and forwards equal amounts should crack the piston valve first one way
then the other. If this is not the case adjust the position of the bobbin on
the piston valve rod until it is.
The engine should now run. If it doesn't the problem is almost certainly
leakage between the piston valve liners and the cylinder bodies.
If you wish to check the dimensions of the relevant bits of valve gear I can
probably scan the relevant parts of the Perrier drawings and email them to
you off list - just ask.
Cheers,
Barrie Purslow
Warrington UK
----- Original Message -----
From: "Pendragon" <idpriest@xxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Sunday, December 05, 2004 4:17 PM
Subject: [modeleng] Re: Valve Gear Modifications
> Barrie,
>
> By any chance re the replacement parts were there any changes to the
> eccentric rod and or the valve bobbin or I suppose thinking about it the
> width of the valves on the bobbin....I fear that the eccentric rod I
> have is too long and and the valve bobbin too short.
>
> My understaning of walsharts is that providing the parts are made
> correctly then the system should work well, and that a pooly designed
> system will not work well and or a pooly made correctly designed system
> will not work. Now then as I regard that my workmanship is good and
> better than most amateur engineers and that I have bushed the original
> Winsons bits and bobs out so that there I little or no play then the
> only thing to deduce as to why it will not run correctly is that the
> design was poor to start with.
>
> If you can be of any assistance I'd be gratful, I am reluctant to remove
> the liners from the cylinders [I didn't fit them] and I believe they
> have been glued in place, this makes measuring the internal orifices /
> distance between ports and port dimensions difficult to say the
> least.........if I hade these measurements I might be able to redesign
> to at least make an acceptable running engine............ah well might
> be something to do on Christmas morning!!!!!!!!
>
> I have never seen the Perrier drawings I take it there is considerable
> difference to the Winsons version.
>
> Regards,
>
> IP
>
> Priest & Sons Model Engineers
> http://www.kinvermes.pwp.blueyonder.co.uk/p1.htm
>
>
> -----Original Message-----
> From: modeleng-bounce@xxxxxxxxxxxxx
> [mailto:modeleng-bounce@xxxxxxxxxxxxx] On Behalf Of BarriePurslow
> Sent: 05 December 2004 13:28
> To: modeleng@xxxxxxxxxxxxx
> Subject: [modeleng] Re: Valve Gear Modifications
>
>
> Hello Ian,
>
> I received the Winson valve gear mods for my Brit. I tried them on the
> engine but could not notice any difference. The basic problem I had was
> the abyssmal design of piston valves allowing leakage between the
> bobbins and the liners also leakages between the liners and cylinder
> body.
>
> I am at a loss to understand why you need the reverser in full reverse
> gear to get it to go forward. Although I do recall that the thread on
> the worm drive was R.H. and I changed it to L.H.....but you're not that
> daft?
>
> The best advice I can offer is to build it to the Perrier drawings. The
> Winson Brit was based on these - they bastardised, sorry, productionised
> it!
>
> Regards,
>
> Barrie Purslow
> Warrington UK
>
>
> ----- Original Message -----
> From: "Pendragon" <idpriest@xxxxxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Saturday, December 04, 2004 10:41 PM
> Subject: [modeleng] Valve Gear Modifications
>
>
> > Greetings all,
> >
> > Saga of the Winsons Brit continues. I have just spent about two hours
>
> > trying to set the valve gear on only one side of the engine. I can
> > just about get it managable providing the reverser is in 100% back
> > when I want to get the loco goinf forwards .....no I haven't got any
> > of the bits in the wrong place or set in the wrong quadrant...not
> > quite that daft yet!
> >
> > I am aware that Winsons had problems with this valve gear and
> > developed a modification, has anyone get any details.
> >
> > Regards IP
> >
> > Priest & Sons Model Engineers
> > http://www.kinvermes.pwp.blueyonder.co.uk/p1.htm
> >
> >
> >
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