[Fot] valve spring pressure on TR4 race engine

[Scott Janzen]

I know I’m working with a very different engine - GT6 - thus smaller valves, but the closed seat pressure is 65 lb and the open pressure is 233 lb at 0.53” lift.  This is per the cam designer.  
I’ve been running similar seat pressures for years, shifting at 7,000 RPM
I would defer to the cam specs/designer.

On Feb 14, 2017, at 3:49 PM, MadMarx via Fot <fot at autox.team.net> wrote:

These are very light springs.
I would run 250 seat pressure and 500 at full lift.
 
Cheers
Chris
 
Von: Fot [mailto:fot-bounces at autox.team.net <mailto:fot-bounces at autox.team.net>] Im Auftrag von timmmurphh--- via Fot
Gesendet: Dienstag, 14. Februar 2017 20:56
An: fot at autox.team.net <mailto:fot at autox.team.net>
Betreff: [Fot] valve spring pressure on TR4 race engine
 
I have 85 lbs. pressure on the intake valve with the valve closed and it sits at a height of 1.655 inches.  At .400 lift, I have 190 lbs. of pressure.  We only run to 6000 RPM with the gearing we have and the engine we have.  The valve springs are double springs and the machine shop says they are all about the same, very consistent.  What pressures would be recommended?  The machine shop thinks these pressures are light for a 6000 RPM engine.  Any advice will be appreciated.  Thanks.
 
Tim Murphy
1961 TR4  #317 BRG
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