Steve,
Int Lift @ Valve is the max lift for the intake valve.
Exh Lift at Valve is the max lift for the exhaust valve.
Seat-to-Seat timing (also sometimes called advertised duration) is the
amount of rotation, in degrees the valve is open. Duration at .050" is the
amount of time the valve is open at least .050". Advertised duration
numbers are rated at varying lifts by different manufactuers. Duration @
.050" is supposed to provide a standard by which to compare cams from
different companies.
The others, IVO/EVO are Intake/Exhaust Valve Opening,
And IVC/EVC are Intake/Exhaust Valve Closing. These are the very numbers
that define a camshaft, along with max lift. You would derive the duration
numbers from these numbers.
The numbers for all these figures are on the cam card. You say you have an
LS-6 solid cam.
http://www.compcams.com/information/WhatsNew/Press/NOSTALGI.PDF
Look at Grind # 11-671-4. It doesn't list the IVO/EVO/IVC/EVC numbers, but
I'm sure Comp could tell you via email or over the phone.
-Dave
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Saturday, April 02, 2005 3:31 PM
To: The Chevelle Mailing List
Subject: [Chevelle-list] Dyno 2000 help
Hello,
I was trying out Dyno 2000 on my computer and was trying to figure out my
engine specs. I'm having trouble figuring out what I need to put in the
various boxes. The cylinder head section shouldn't be too hard to figure
out. I'm running an Edelbrock Performer dual plane manifold (Square port/
closed chamber). I figure I can probably get the specs I need from their
website once I figure out the exact one I have.
The trick is the cam specs I'm running an LS-6 Solid cam. I can't
figure out what numbers I need to use for "Int Lift @ Valve" and Exh Lift @
Valve". I'm also not sure the difference between seat-to-seat timing and
0.050 lift.
The other part I'm not sure about is the "IVO (BTDC),EVO (BBDC), IVC(ABDC),
and EVC(ATDC). The default values seems to be "31.0, 67.0, 67.0, and 31.0"
respectively. Should I leave those values?
Thanks for your help. Obviously, I never assembled an engine before. I am
looking for an upgrade for my tired LS5 and spoke with Ohio Crankshaft.
They suggested a Merlin III 548ci short block with my Edelbrock heads. In
the long run, I should probably ditch the LS6 cam for something else, No?
BTW, does anyone have anything to say (Pro or Con) about Ohio Crankshaft?
Their short blocks seem much less expensive than the GM crate motor options
and have more potential.
Thanks
Steve Lentz
70 SS454or more ;-)
