I would be EXTREMELY careful with too high a spring pressure. Been there,
done that! If you go by all the STD calculations, theories and what you
'should have' texts. It will tell you need HIGH springs pressures. Destroyed
a couple of cams that way! I just went back to springs with about the seat
pressures you are looking at. Haven't had an issue with cams/cam lobes
since.
"You can Make a Small Fortune From Motor Racing. As long as You Started With
A Lage Fortune!"
Kind Regards
Peter Vucinic
TR4 - TR7 V8 - Spitfire MkII
_______________________________________________
<http://www.fot-racing.com/> http://www.fot-racing.com
Archive: <http://www.team.net/archive> http://www.team.net/archive
Forums: <http://www.team.net/forums> http://www.team.net/forums
From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of timmmurphh--- via
Fot
Sent: Wednesday, 15 February 2017 6:56 AM
To: fot at autox.team.net
Subject: [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
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://autox.team.net/pipermail/fot/attachments/20170215/2deef23b/attachment.html>
|