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Valve Spring Height (Schneider vs Stock)


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Good afternoon all,

 

     So I tried installing all new rocker arms today (ITM engines), and found that there isn't enough clearance to do so, even with the pivots lowered all the way down into the head. I decided to check the valve spring installed height (no load) and took two off to measure the free length, and here's the specs.

 

Free Height: 2.210" Outer, 1.910" inner

Installed: 1.72" (Measured from spring seat to underside of retainer, may be a little off, .020 at most)

 

These are Schneider springs, and both measurements are far larger than what the "How to rebuild your Datsun" book specifies for stock. The installed height is larger than what Schneider specifies for the "Doubles" and "Hi-Lift" Datsun springs as well. The camshaft I'm running is a stock E30 "A" grind from a 240z, with stock lash-pads. Do I need to revert to stock springs/retainers to match the stock cam? Has anyone had similar issues, or used Schneider springs with a stock cam? Before I order stock springs I just want some input from you Ratsun gurus. Thanks for your help, as always.

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You're using stock pads in those Schneider retainers..........is the top of the pad sitting below the top of the retainer?

Is it above....?....or flush?

 

Would assume those retainers are designed to run a taller/thicker pad....but

Since you have a stock cam, I would be inclined to run stock springs and retainers

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I think you might be on to something with the retainer size. The lash pads contact patch sits below the rim of the retainer's lash pad ring, and it looks like that may be causing the interference that's keeping me from being able to properly adjust the valves. Problem is now tracking down stock retainers. I can get the stock inner/outer springs pretty much anywhere, but retainers are another story.

 

Thanks for your input! Hopefully I can find some retainers soon.

 

Also, can someone post a closeup photo of a stock lash-pad/retainer/spring setup? I cant find anything decent online, just need to know the dimensions of the stock retainer, and if the lash pad is level with the retainer or not.

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