RFguy Posted January 6, 2022 Share Posted January 6, 2022 I might need some different valve springs. There are quite a few suppliers in the US, does anyone have suggestions of local companies to talk to in Australia ? glen Link to comment Share on other sites More sharing options...
RFguy Posted January 6, 2022 Author Share Posted January 6, 2022 (edited) More info- I have to up the seated pressure by about 7 to 10 lbs without increasing the open pressure too much. If I put an extra shim (washers !) under the springs under the spacer against the head, that would lift the seated pressure- The springs are approx 136 lbs/inch , so 0.07" would yield 8.5 lbs etc That might work as long as I dont get a bind situation. have different collet holders on different valves , they are different thicknesses so that will also change the seated pressure for each valve. ideas and comments appreciated... Glen Edited January 6, 2022 by RFguy Link to comment Share on other sites More sharing options...
Thruster88 Posted January 6, 2022 Share Posted January 6, 2022 Is this to make the hydraulic lifters work correctly? Link to comment Share on other sites More sharing options...
onetrack Posted January 6, 2022 Share Posted January 6, 2022 Performance Springs in Yatala have a range of off-the-shelf valve springs, or they will do a production run to your specific sizing/strength - at much increased cost, of course. https://performancesprings.com.au/46-cylinder-singles/ Link to comment Share on other sites More sharing options...
RFguy Posted January 6, 2022 Author Share Posted January 6, 2022 Thanks OneTrack. Stuart- yes, and there is alot to this and I will publish when I am sure of all my facts and double checked the math. Link to comment Share on other sites More sharing options...
RFguy Posted January 6, 2022 Author Share Posted January 6, 2022 Performance Springs in Yatala , particularly, Allen Waye has been very helpful . 1 Link to comment Share on other sites More sharing options...
facthunter Posted January 6, 2022 Share Posted January 6, 2022 Generally I wouldn't advise packing them. An increase of free length would do what you want. Increase of wire dia makes the rate greater. There's a lot in it. Harmonics etc. Conical might have some advantages but you are probably using double springs. Most spring makers want a sample which is fair enough from their point of view. You can only have good springs if they are made from the best wire and heat treatment. Nev 1 Link to comment Share on other sites More sharing options...
RFguy Posted January 6, 2022 Author Share Posted January 6, 2022 (edited) Hi Nev thanks for the input. Yeah, we'll see what Mr Waye has to say. "An increase of free length would do what you want." yes - that's it. bind wont be an issue. have samples... Have single springs. I dont think there is an advantage (harmonics, bounce) at these low RPM for double springs, although a spring failure well yeah but dont hear about too many of those. I'll be guided by the spring doctor. Edited January 6, 2022 by RFguy Link to comment Share on other sites More sharing options...
facthunter Posted January 6, 2022 Share Posted January 6, 2022 (edited) Conical or progressive helix tightening are for harmonics. Multi springs would have to be in contact to affect harmonics. Continental have three (3) springs. I only mention that in passing. Most ot the (older) motor bikes I do are double spring but high pressures can cause a lot of problems and are only required on the higher RPM or "fast" (quick lift) cam equipped engines. The cam follower mass comes into this as it has to be kept on the cam profile by the valve spring force. .Nev Edited January 6, 2022 by facthunter 1 Link to comment Share on other sites More sharing options...
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