cam question - center line
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Melting Slicks
Joined: Dec 2005
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From: sterling ct
cam question - center line
lets suppose you have two identical cams 226/228 580 580 one is ground on a 117 center line and the other a 112 center line. please explain the bottom line difference between the two. idle, power range, emissions...anything else i am overlooking?? thank you in advance
Team Owner
Joined: Sep 2003
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From: Raleigh / Rolesville NC
In a nut shell ( over simplifed) the 117 will have a smooth idle, more emission friendly. HP will be in upper RPM range.
the 112 lsa will be slighlty lopy idle, less emission friendly, HP will come on sooner in the RPM curve.
The 117 will feel strong up top, 112 will feel strong at launch and mid range.
Good reading here: http://ls1tech.com/forums/showthread.php?t=327734
the 112 lsa will be slighlty lopy idle, less emission friendly, HP will come on sooner in the RPM curve.
The 117 will feel strong up top, 112 will feel strong at launch and mid range.
Good reading here: http://ls1tech.com/forums/showthread.php?t=327734
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Here is a small explanation for you:
Cam Specs & Effects
Understanding cam specs and their affects will help you select the best cam for your specific engine. The four important camshaft specs to understand are duration, centerline, separation and lift.
DURATION
Duration refers to how long a valve is opened in relation to crankshaft rotation. This open valve time period is expressed in degrees of crankshaft rotation. So, a cam specification of 220 degrees duration simply means the cam holds the valve open for 22 0 degrees of crankshaft rotation.
As strange as this may sounds, more duration can be helpful in high RPM engines but not low RPM engines. The extra degrees of open valve time in high RPM engines gives the air flow a little more time to get into (or out of) the cylinder in spite of the pi ston's stroke. However, at lower RPMs, more duration can cause less power because the valves will be open at the wrong time in relation to the piston's stroke up or down in the cylinder.
CENTERLINE
The cam's centerline specification is used to tie the valve timing to the crankshaft's rotation. This spec is expressed as the number of degrees the crankshaft must rotate from top dead center until the cam has rotated to the peak (or centerline) of the lobe.
The centerline spec and the duration spec can be used to calculate when the valves open and close in relation to the crankshaft's rotation. When the valves open (or close) relative to the crankshaft's rotation is known as valve events or valve timing. Some cam manufacturers will provide valve event information and others only p rovide duration and centerline information. If your cam manufacturer doesn't provide valve event information, a software program such as Cam Shop can calculate this info for you.
Understanding the effects of valve events or valve timing is the real secret to understanding engine performance. For the engine to run at its peak performance, the valves must open and close at the correct time in relation to the piston's position and the crankshaft's speed. For more information on this subject see the Valve Timing & Performance page.
SEPARATION
Separation refers to the spacing between the intake lobe and exhaust lobe on the cam shaft. This spacing (or separation) is expressed in degrees on the cam, not on the crankshaft. So, a 108 lobe separation means the intake and exhaust lobes are 108 degrees apart from each other on the cam shaft.
This spec by itself really doesn't mean anything. If you hear someone else is using a cam with 108 separation, don't think that you should use cams that only have 108 separation!
Separation, just like centerline, is another way to tie the duration to the crankshaft rotation and end up with valve events. This spec is a little more complicated though, because it is in cam shaft degrees and the crankshaft rotates two degrees for each one degree of cam rotation. Also, if the cam has been installed either advanced or retarded, the valve events will be different. This is where the Cam Shop software can make your decisions easier because the software does all of the calculations for you and you don't have to guess at these confusing relationships.
LIFT
The final cam spec to understand is lift. While duration refers to how long the valve is opened, cam lift is used to determine how wide the valve is opened.
If the valves are not opened wide enough, they will cause a restriction for the air trying to enter or exit the cylinder. However, opening the valve past a certain point will not increase the flow to (or from) the cylinder. A good way to demonstrate this is with the garden hose in your back yard. When you first start to turn the water on, the flow increases but after a turn or so, opening the valve more has no effect on how fast the water comes out of the hose.
It is necessary to understand a large amount of science to understand how the flow is related to how wide the valve is opened and how this affects the engine's power. However, the simplest and easiest way to see how the lift affects engine power is with a software program like Engine Shop or Engine Analyzer.
Thanks,Matt
Cam Specs & Effects
Understanding cam specs and their affects will help you select the best cam for your specific engine. The four important camshaft specs to understand are duration, centerline, separation and lift.
DURATION
Duration refers to how long a valve is opened in relation to crankshaft rotation. This open valve time period is expressed in degrees of crankshaft rotation. So, a cam specification of 220 degrees duration simply means the cam holds the valve open for 22 0 degrees of crankshaft rotation.
As strange as this may sounds, more duration can be helpful in high RPM engines but not low RPM engines. The extra degrees of open valve time in high RPM engines gives the air flow a little more time to get into (or out of) the cylinder in spite of the pi ston's stroke. However, at lower RPMs, more duration can cause less power because the valves will be open at the wrong time in relation to the piston's stroke up or down in the cylinder.
CENTERLINE
The cam's centerline specification is used to tie the valve timing to the crankshaft's rotation. This spec is expressed as the number of degrees the crankshaft must rotate from top dead center until the cam has rotated to the peak (or centerline) of the lobe.
The centerline spec and the duration spec can be used to calculate when the valves open and close in relation to the crankshaft's rotation. When the valves open (or close) relative to the crankshaft's rotation is known as valve events or valve timing. Some cam manufacturers will provide valve event information and others only p rovide duration and centerline information. If your cam manufacturer doesn't provide valve event information, a software program such as Cam Shop can calculate this info for you.
Understanding the effects of valve events or valve timing is the real secret to understanding engine performance. For the engine to run at its peak performance, the valves must open and close at the correct time in relation to the piston's position and the crankshaft's speed. For more information on this subject see the Valve Timing & Performance page.
SEPARATION
Separation refers to the spacing between the intake lobe and exhaust lobe on the cam shaft. This spacing (or separation) is expressed in degrees on the cam, not on the crankshaft. So, a 108 lobe separation means the intake and exhaust lobes are 108 degrees apart from each other on the cam shaft.
This spec by itself really doesn't mean anything. If you hear someone else is using a cam with 108 separation, don't think that you should use cams that only have 108 separation!
Separation, just like centerline, is another way to tie the duration to the crankshaft rotation and end up with valve events. This spec is a little more complicated though, because it is in cam shaft degrees and the crankshaft rotates two degrees for each one degree of cam rotation. Also, if the cam has been installed either advanced or retarded, the valve events will be different. This is where the Cam Shop software can make your decisions easier because the software does all of the calculations for you and you don't have to guess at these confusing relationships.
LIFT
The final cam spec to understand is lift. While duration refers to how long the valve is opened, cam lift is used to determine how wide the valve is opened.
If the valves are not opened wide enough, they will cause a restriction for the air trying to enter or exit the cylinder. However, opening the valve past a certain point will not increase the flow to (or from) the cylinder. A good way to demonstrate this is with the garden hose in your back yard. When you first start to turn the water on, the flow increases but after a turn or so, opening the valve more has no effect on how fast the water comes out of the hose.
It is necessary to understand a large amount of science to understand how the flow is related to how wide the valve is opened and how this affects the engine's power. However, the simplest and easiest way to see how the lift affects engine power is with a software program like Engine Shop or Engine Analyzer.
Thanks,Matt
