What does lift do?....
Jul 11, 2005 | 05:54 PM
#1
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From: Edinburg, TX
What does lift do?....
What is the advantage and disadvantage of a low lift camshaft and a high lift camshaft? 
pros and cons of XE grind?
pros and cons of XE high lift grind?
pros and cons of XE-R grind?
Which do you guys think is the most appropriate grind for a truck?
pros and cons of XE grind?
pros and cons of XE high lift grind?
pros and cons of XE-R grind?
Which do you guys think is the most appropriate grind for a truck?
Jul 11, 2005 | 11:03 PM
#3
Originally Posted by Tractionless
What is the advantage and disadvantage of a low lift camshaft and a high lift camshaft?
pros and cons of XE grind?
pros and cons of XE high lift grind?
pros and cons of XE-R grind?
Which do you guys think is the most appropriate grind for a truck?
pros and cons of XE grind?
pros and cons of XE high lift grind?
pros and cons of XE-R grind?
Which do you guys think is the most appropriate grind for a truck?
The more aggressive lobes open and close the valves quicker, they are a bunch of marketing Bull you pay more for a cam with those lobes than symmetrical ones plus they are alot harder on the valvetrain
higher lift means more air the valve is opened more
Last edited by 02sierraz71_5.3; Jul 12, 2005 at 12:36 AM.
Jul 12, 2005 | 12:33 AM
#5
Originally Posted by 02sierraz71_5.3
they are a bunch of marketing Bull you pay more for a cam with those lobes than symmetrical ones.
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Jul 12, 2005 | 10:45 AM
#8
Originally Posted by Tractionless
C'mon guys.... someone must know about valve lift. 
https://ls1tech.com/forums/showthread.php?t=327734
Jul 12, 2005 | 11:28 AM
#9
High lift usually is a good indication that your ramp speed is very aggressive. Meaning, your valve is going to pop open real quick like. Is this good? Depends.
Most camshafts set for n/a profiles use an aggressive intake lobe to pop the valve open quickly to where the head flow is substantially greater. Take a look at a head flow chart and you'll see why this is a good idea.
The exhaust is a different story. Once you crack it open the gases are drawn out quickly because it is pressurized. So, you can use a slower exhaust lobe with less net lift.
Most camshafts set for n/a profiles use an aggressive intake lobe to pop the valve open quickly to where the head flow is substantially greater. Take a look at a head flow chart and you'll see why this is a good idea.
The exhaust is a different story. Once you crack it open the gases are drawn out quickly because it is pressurized. So, you can use a slower exhaust lobe with less net lift.
Simply put, on an N/A motor the intake air charge is not assisted. (Leaving wave dynamics of the air charge out for a moment). After the combustion stroke there is tremendous pressure in the cylinder. As soon as the exhaust valve cracks open it flows a LOT of air. It's basically boosted out of the cylinder if you want to look at it like this. Having the exhaust valve open too early not only costs heat (power) and velocity through the exhaust runners, it also empties the cylinder before the intake valve is open enough to take advantage of the pressure differential.
Jul 12, 2005 | 11:33 AM
#10
Originally Posted by zippy
it's not a matter of not knowing what lift is. there is alot more to know about a camshaft than it's lift. that's why most won't answer.
Lift is just how far the rocker is pushed to open the valve, but the way it is applied, i.e. fast ramp/ slow ramp etc. has a lot more to do with it than just the amount of lift your cam has.
