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I had a similar situation the first time I ran my TR-4 engine on the dyno.
We ended up running the dashpots 'dry' (actually took out the rod and
damper all together) and also took out the spring which goes down inside
the piston. With these eliminations, there is no resistance to the piston
rising, except for the weight of the piston. The pistons would then rise
fully up into the dashpots. (That last sentence has a strong sexual
connotation - unintended for sure!) Good luck.
-----Original Message-----
From: Janice/Matt Matthews [SMTP:matthews-home@worldnet.att.net]
Sent: Wednesday, September 15, 1999 10:46 AM
To: 'Amici Triumphi'
Subject: SU carb piston lifts.
I would appreciate some help from the Spitfire racers.
We have a SCCA FP 1300 Spitfire with dual 1.5 inch SU's.
Under load at 5000 RPM, our carburetor pistons only rise about 0.5 inches
instead of much higher. If we put the carbs on a flow bench so that the
flow is equal to the volumetric demand of the 1300 engine at 8000 RPM we
get similar elevations.
What carburetor piston elevations do other Spitfires get? Or other Triumphs
for that matter.
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