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Old 04-20-2006, 08:42 PM
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Cam Questions, info

I found the following in a performance related email newsletter and am asking for your input and what you think about it... -matt

Picking the Right Camshaft

What needs to be decided and in what order:

1. Lobe Family - This is a group of lobes that have
similar open/close ramps, but different durations. I
truly believe the smartest thing Comp Cams every did
was publish lobe specs in the back of their catalog -
it instantly made me a fan.

2. Intake Duration - If I had never run a Spin-Tron
this would be my number one. Get intake duration and
lobe family correct and you're 90% there.

3. Exhaust Duration - This maybe number three on the
list, but is actually a long way from the importance of
the first two.

4. Lobe Separation - Take every lobe separation you've
ever seen run with your application, place them on a
dart board, close your eyes and throw. That's how
relatively important this spec is.

Before I continue I want to talk about something I've
noticed on most message boards - whenever someone
mentions that something is not important, they are
immediately hammered with "Yes it is!!!" Don't let
these people stop you from practicing the 80/20
principle.

Questions that need to be answered:

* Engine Size - Use to pick durations.
* RPM Range - Use to pick durations.
* Rocker Ratio - Use to pick lobe family.
* Valvetrain Weight - Use to pick lobe family.
* Valve Springs - Use to pick lobe family.
* Exhaust Flow - Use to finalize exhaust duration

Questions that only need to be answered when you're
trying to look smart:

* Cylinder Heads
* Runner CCs
* Intake Manifold
* Compression
* Valve Size
* Header Size
* And on and on and on...

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Old 04-20-2006, 09:55 PM
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I am not going to fully dive into this discussion, but I can tell you the difference lobe seperation makes while tuning an ECM for a new cam. Go over to corvetteforum or thirdgen.org's forum and ask them what they think about lobe seperation and how it affects idling and tuneability.
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