[Fot] valve spring pressure on TR4 race engine

[bfeparts at aol.com]

Hello Tim,
 
Generally speaking your spring height should be set at 1.600 with something north of 100 lbs seat pressure. With a cam of only .400 valve lift you should have at least 210 lbs at full lift. At 6000 RPM you will not have any valve float with these figures.
 

Brian Howlett
British Frame and Engine
626-419-2786
bfeparts at aol.com


 
 



 

Von: Fot [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
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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