Manning Wardles "YEO" and "EXE" new-build

It is. But her followers are not all known for their wise moderation or sense of proportion. As can be seen, amongst other things, by the demands of those protesting at McDonalds factories this weekend.


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That's very interesting and exactly the answer I was looking for - thank you!

 

Were any engines with roller bearings ever de-fitted? Did any UK engines have roller bearings in the motion?
Until I got here, I had never heard about the issues of brinelling (?), so there is a clear downside.

A bearing with less resistance is going to save running costs of the engine over time (what does it do to pw?), but they seem to have costs for non-use as well.

Like superheat, for an engine hauling 400 tons on a daily basis, as was the duty of a late-period working steam engine, they may not make sense for the lighter, less repetitive duty of a preserved railway

 

You can also get an effect called false brinelling where the bearing only moves small amounts. The lubricant doesn't get distributed properly because the bearing doesn't rotate enough. This causes small patches to wear heavily in the race. Definitely a concern for valve gear. In fact this exact problem was discovered when Linda and Blanche had needle rollers fitted to the valve gear.

Tim

 

First an admission. I know s*d all about grades of lubricants used in steam locos, just noting that the evil megacorporation Exxon Mobil (all together now, Boo -hiss!) have been flogging a synthetic engine lubricant for around 50 years now. The original rationale was that the viscosity is far less changeable with temperature.

My old boss explained that, if you left the M1 in London, after hacking down it full tilt from Leeds in big car, like 3.5ltr Rover, unlike conventional engine oil, the low pressure light stayed off when using an SHC. Our best customers for the stuff (thrice the price of mineral oils in the 1970s) were German bikers, of which we had many, as Kingfisher Service Station seemed to be well known in those circles.

Whether or not suitable grades for steam locos exist, I'm unsure, but daresay, as race biking aficionados, either @guycarr360 or @RalphW may be in a better position to comment on how much of a difference SHCs make in the real world.

 

Would like to help, but being honest i dont have much knowledge of it, i do know all of the old classic stuff, if racing is ran on modern fully synthetic engine oil.
The classic smell of Castrol R is gone on modern 2 strokes, as the heat generated by the engine, is not enough to guarantee lubrication.
Again, that is why the move to fully synthetic 2 stroke oil is now almost universal, IF you have an old Air Cooled 2 stroke, Castrol R is the best available.

@osprey would be a good bet to answer this though.

 

In terms of operation, slide valves have advantages over piston valves in some respects. It's a true saying to say that slide valves wear in whilst piston valves wear out and they require little in the way of maintenance. Piston valve rings soon start to wear and allow steam to pass, reducing efficiency. Other advantages of slide valves are when coasting, where the valve drops off its seat and similarly the protection it provides against hydraulicking of the cylinder. The advantage of piston valves is that they are balanced and thus require less force to move them. They are also better with regard to the higher temperatures of superheat.

 

Yet the return crank of valve gear was about the only place where rotating contact bearings found favour and much use on British Railways steam locos. The only UK steam locos that I can think of to be fitted with rotating contact bearings on coupling and connecting rods were the S.C. of W. Bagnall's. Some diesel locos had them on coupling rods but solid bushes remained a preferred arrangement to the end.

 

Interesting Steve - thanks

 

Roller bearings were used in the rods and motion of some DB classes, I believe. I wonder how they fared?
Pat

 

https://www.caranddriver.com/resear... that,of artificially made chemical compounds.

I think fully-synth is still processed dinosaur. Castrol R on the other hand...

 

Foden steam lorry’s have roller bearings.

 

Given the reported increase in numbers of visitors to the L & B perhaps these locomotives are going to be needed sooner than expected ...perhaps we may get an update as well?

 

Do the 'new' frames of YEO (built a few years ago) still exist and if so, where are they please?
I am led to believe that they do not meet the current build standard and will be scrapped?

 

Thanks for your prompt reply.

 

There is a progress update from Jon Pain, on the Manning Wardle project, in the latest L&B magazine (which members will have received in the past couple of days). I expect this will get posted on the 762 Club website in the not too distant future.

 

Having received my L & B magazine today it was good to read that the fund for the Manning Wardle's has reached around £150,000. This means that more parts (- castings and forgings) have been, or are soon to be, ordered.....but it would be good to get the website updated!

 

Just in case anyone missed this:

 

The following photograph by David Cooke is 'shared' from Facebook without any comment other than to say that you will be surprised what can be seen and learnt from the project teams at both the L&BR Spring and Autumn Galas, the next being (Covid permitting) at Woody Bay on Saturday 14th/Sunday 15th May 2022.