Forum sponsored by:

Super Simplex Valve gear

Slide valve setting

Search for: in Thread Title in

Deric	24/09/2019 21:29:45
44 forum posts 27 photos	Evening all, Some advice please, on the subject of slide valve setting. Everything’s in place and I have checked and double checked, the ride height is set at 13/16”, timing is set at TDC and BDC , it rolls very smoothly with no tight spots. But I’m not sure about the actual slide valve position, I read somewhere a long while ago that Super Simplex should have a lead of 0.020” . Can someone either describe the positioning of the slide valve or point to an article for more details/information. Help is much appreciated
duncan webster	24/09/2019 22:11:34
5307 forum posts 83 photos	With Walschearts gear the lead is fixed, just set the valve on the spindle so it opens equally at TDC and BDC. If it is actually 0.02, that is lot of lead for a 5"g loco. The only way to reduce it is to either make a new longer valve, or a new combination lever. Clearly the first is easier
Nigel Graham 2	24/09/2019 22:22:50
3293 forum posts 112 photos	Just to amplify a little, the lead is set by valve and port dimensions, not valve position; although if that's out of adjustment it will give early admission at one end and late at the other.

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy

Latest Forum Posts

*Oct 2023: FORUM MIGRATION TIMELINE*
05/10/2023 07:57:11
Making ER11 collet chuck
05/10/2023 07:56:24
What did you do today? 2023
05/10/2023 07:25:01
Orrery
05/10/2023 06:00:41
Wera hand-tools
05/10/2023 05:47:07
New member
05/10/2023 04:40:11
Problems with external pot on at1 vfd
05/10/2023 00:06:32
Drain plug
04/10/2023 23:36:17
digi phase converter for 10 machines.....
04/10/2023 23:13:48
Winter Storage Of Locomotives
04/10/2023 21:02:11
More Latest Posts...
View All Topics

Support Our Partners

Shopping Partners

Subscription Offer

Latest "For Sale" Ads

Reeves** - Rebuilt Royal Scot by Martin Evans
by John Broughton
£300.00
BRITANNIA 5" GAUGE James Perrier
by Jon Seabright 1
£2,500.00
Drill Grinder - for restoration
by Nigel Graham 2
£0.00
WARCO WM18 MILLING MACHINE
by Alex Chudley
£1,200.00
MYFORD SUPER 7 LATHE
by Alex Chudley
£2,000.00
More "For Sale" Ads...

Latest "Wanted" Ads

D1-3 backplate
by Michael Horley
Price Not Specified
fixed steady for a Colchester bantam mark1 800
by George Jervis
Price Not Specified
lbsc pansy
by JACK SIDEBOTHAM
Price Not Specified
Pratt Burnerd multifit chuck key.
by Tim Riome
Price Not Specified
BANDSAW BLADE WELDER
by HUGH
Price Not Specified
More "Wanted" Ads...

Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues