k24 - Schrick combo

[Bruce Bell]

Hi Glen,

Interesting combination.  Did you start with the k24 then add the cam or
visa versa? You mention, or suggest,  in a subsequent post this is a "full
race engine", I'm wondering if you have any baseline numbers for evaluating
the performance benefit of the changes.  I ask because the combination of
the k24 and Schrick cam are quite a counterintuitive combination to my
thinking. While the K24 is a great turbo for providing low end response and
the Schrick a great cam for high end response, at least in a NA motor, and
this at first blush this would seem reasonable given both cam and turbo are
essentially VE (torque) modifiers and your combination would provide the
best combination to provide torque from low to high. However, the low end
torque provided by the K24 is due in big part to the small exducer on the
turbine. a feature, which at high flow, provides considerable backpressure
in the exhaust manifold and the Schrick 272 (with 50 degrees overlap) does
not want to see high backpressure in the exhaust. In fact too much
backpressure will dramatically reduce VE, especially with lots of overlap.
I'm wondering if you tried other combinations before selecting this one. For
a "full race engine", especially with 2.4 liters and big valves, I would
have expected you to go with the K26 or even the k27 with that cam.

I'd love to see the shape of your torque curve, any chance you have times in
say third gear from 2-3-4-5-6-7 K rpms?

My thinking Glen is that cams, valves and turbos are all VE modifiers but
they can't be considered independently and that the cam and turbo need
consideration as a matched pair for a specific use. i.e. daily driver,
occasional track, race etc.

Without a BTDT on your particular combination, my discourse is purely
philosophical, I'm just hoping you can provide some real world numbers that
the rest of us can use for baseline evaluation.

tia

Bruce

-----Original Message-----
From: Fundsalo Racing
Sent: Sunday, March 17, 2002 6:52 AM

Consider the Schrick 268 or 272 hydro cams. I run the
272 with a very similar setup, WX, KH, K24, but more
mods still, Lehmann chip, 15 PSI,  2.4L, 6th injector,
big valves, etc, and it's a great combination!

-glen