Andrew, this is probably wasting your time, but the only info I have is (a) Stanley Edge's original calculations said the valve spring fitted length was 1 1/4", the coil OD 7/8", the fitted load 25 lbs, must compress to 7/8". Against this is I think the standard valve spring became 1 5/8" long by 7/8" OD. (b) a Speedy outer spring was 1 7/8" long by 1" OD, the inner 1 15/16" long by 11/16" OD. Can't find what I've done with the Ulster specs. All this because no-one has given you any useful info as requested and this may not be much more help, but I don't have any pressure figures. . Cheers, Bill

Location: Euroa, Australia

Good morning Bill,

Many thanks for the info, very kind and all very helpful. Doing the load checks on the springs this week. You wouldn't have info on the speedy fitted load(seat pressure) please?

Andrew

Sorry, no, The Speedy figures I gave were obtained from measuring my own engine. If you are contemplating fitting Speedy double springs, let me know & I'll send you a sketch with measurements of the base plates which keep the springs separated. Cheers, Bill

Location: Euroa, Australia

Hi Andrew, This information must be readily available simply because new springs are being made and sold so the manufacturer and sellers must have a set of Specs to work from Other wise it is all hit and mis.
As this would make it very hard for Engine builders.

Would be nice to hear from a manufactuer

Location: TINOPAI NZ

Agree with Colin. Re my previous posting, 'cos I was sending from local library I had no reference when trying to remember the name of the part, so called it a "base plate". In the Parts Lists for the RP they are called "cups", but in the Type 65 Parts List the terminology is "spring caps". Cups or caps, it's your guess. Cheers, Bill

Location: Euroa, Australia

Hi Guys

Many thanks for your help on this. Hopefully have a set organised shortly. Away to do some load checks on springs.
Thanks again
A