Cut off vs. Angular Advance

Cut off vs. Angular Advance

This topic has 2 replies, 2 voices, and was last updated 7 November 2020 at 08:29 by Simon Collier.

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7 November 2020 at 02:46 #505709
David Smith 48
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@davidsmith48
I'm considering reducing the lap of the slide valves on my 4-4-0 with Stephenson valve gear increase the cut off from 70% to 80%. The objective is to improve starting on a grade or with heavy load. I recently found on the internet a design spread sheet by Don Ashton that provides dimensions and predicted results for particular dimensions. Has anyone had actual experience with Mr. Ashton's spread sheet and made actual parts to his proportions? How were the results?

Thanks, Dave
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7 November 2020 at 02:46 #1979
David Smith 48
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@davidsmith48
7 November 2020 at 08:29 #505724
Simon Collier
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@simoncollier74340
I've used Don's spreadsheet and taken the data to the Wallace simulator. I've not cut parts for Stephensons but would do so with complete confidence.
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