I run dual Isky valve springs on my modified 1296 engine. My rationale has
always been that dual springs offer much greater spring tension to prevent
valve float in the higher RPM range.
Joe C.
-----Original Message-----
From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
Behalf Of George Harmuth
Sent: Tuesday, October 19, 2010 11:41 AM
To: fot@autox.team.net
Subject: [Fot] Spitfire race motor 1296, Dual or single valve springs?
I've been wondering what's the best approach. I've always run double
springs as an insurance policy against a broken spring dropping a valve but
I have to say I've never broken a spring. Are there any other advantages to
doubles, enough to offset the mass penalty? Neither engine has a
particularly radical cam, .450 and .470, zero lash, and I don't like to rev
over 7200. I know springs are made of sterner stuff these days, should I
use single springs and if so any suggestions?
thanks
mike
63 Spitfire
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