[Fot] valve spring pressure on TR4 race engine

[John Styduhar]

The specs for the Isky dual spring setup (TR05-TR06) and TR-777 cam I use
in my TR3 racer are:

installed height 1.625"
seat pressure 100#
max coil bind height 1.060"
spring rate #/inch 320
TR777 cam lift .480"

I don't think your seat pressure is too far out of line but you should
check your installed height with the manufacturer's spec sheet as Scott
suggested.  You may be able to increase seat pressure by adding shims but
make sure to check for coil binding at max lift.





On Tue, 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] *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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