Thats like asking what are the best numbers to pick on a lottery ticket 
Help on Camshaft
Melting Slicks
Joined: Mar 2004
Posts: 3,472
Likes: 18
From: Lake Ozark, MO
Must be some general guidlines.....like:
Assuming a constant lobe center angle
Longer duration more peak power, rougher idle,
higher fuel consumption,
higher emissions,
less torque at low RPMs,
power peak occurs at higher RPM,
power rpm band widens and moves up
Shorter duration the opposite of the above results
Assuming constant duration
Tighter lobe centers more peak power,
higher fuel consumption
rougher idle
more torque at low RPMS,
peak power occurs at LOWER RPM,
higher emissions,
power RPM band gets narrower and moves DOWN
Wider lobe centers opposite of above
Assuming constant lobe centers and cam duration
Advancing the cam slightly improved low rpm torque,
slightly reduced peak power
imperceptible change in emissions, idle & fuel consumption
Retarding the cam opposite of the above
Assuming a constant lobe center angle
Longer duration more peak power, rougher idle,
higher fuel consumption,
higher emissions,
less torque at low RPMs,
power peak occurs at higher RPM,
power rpm band widens and moves up
Shorter duration the opposite of the above results
Assuming constant duration
Tighter lobe centers more peak power,
higher fuel consumption
rougher idle
more torque at low RPMS,
peak power occurs at LOWER RPM,
higher emissions,
power RPM band gets narrower and moves DOWN
Wider lobe centers opposite of above
Assuming constant lobe centers and cam duration
Advancing the cam slightly improved low rpm torque,
slightly reduced peak power
imperceptible change in emissions, idle & fuel consumption
Retarding the cam opposite of the above
Drifting
Joined: Apr 2003
Posts: 1,323
Likes: 2
From: Castle Hills Texas
Go here and become edumacated on it.
http://www.streetracersonline.com/articles/camshafts/
It'll tell you what all the info. means.
http://www.streetracersonline.com/articles/camshafts/
It'll tell you what all the info. means.
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Drifting
Joined: Sep 2004
Posts: 1,959
Likes: 1
From: North Bend Ohio
Originally Posted by kylelm
IM putting it in a 69 350 4 speed and looking for more than 400hp. I want a good torque but also a decent top end. Does this help any?........
What is the compression ratio of the engine? Does it have headers? If it doesn't, you should do this before a camshaft. Has it had any head work done? If not, you should do this before doing a camshaft. What final drive ratio does it have?
BigBlockk
Later.....
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
Originally Posted by Crash80
Go here and become edumacated on it.
http://www.streetracersonline.com/articles/camshafts/
It'll tell you what all the info. means.
http://www.streetracersonline.com/articles/camshafts/
It'll tell you what all the info. means.
Later,
Sly