Lobe seperation - Manual vs Automatic

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Lobe seperation - Manual vs Automatic

Post  HorsinAround on April 5th 2012, 2:22 pm

Seems like I read somewhere that the lobe seperation is different if an automatic is used. So, my questions is what is recommended for automatics vs Manuals or does it make a difference?
Trying to further my edgication on cams. lol

thank you,

AP
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Re: Lobe seperation - Manual vs Automatic

Post  rmcomprandy on April 5th 2012, 2:26 pm

HorsinAround wrote:Seems like I read somewhere that the lobe seperation is different if an automatic is used. So, my questions is what is recommended for automatics vs Manuals or does it make a difference?
Trying to further my edgication on cams. lol

thank you,

AP

That is strictly due to idle quality and what is needed.

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Re: Lobe seperation - Manual vs Automatic

Post  Danny Cabral on April 6th 2012, 5:17 am

VARYING LOBE SEPARATION ANGLE:
Tighten
Moves Torque to Lower RPM
Increases Maximum Torque
Narrow Powerband
Builds Higher Cylinder Pressure
Increase Chance of Engine Knock
Increase Cranking Compression
Increase Effective Compression
Idle Vacuum is Reduced
Idle Quality Suffers
Open Valve-Overlap Increases
Closed Valve-Overlap Increases
Natural EGR Effect Increases
Decreases Piston-to-Valve Clearance

Widen
Raise Torque to Higher RPM
Reduces Maximum Torque
Broadens Power Band
Reduce Maximum Cylinder Pressure
Decrease Chance of Engine Knock
Decrease Cranking Compression
Decrease Effective Compression
Idle Vacuum is Increased
Idle Quality Improves
Open Valve-Overlap Decreases
Closed Valve-Overlap Decreases
Natural EGR Effect is Reduced
Increases Piston-to-Valve Clearance

--------------------------------------------

ADVANCING / RETARDING CAM TIMING:
ADVANCING
Begins Intake Event Sooner
Open Intake Valve Sooner
Builds More Low-End Torque
Decrease Piston-Intake Valve Clearance
Increase Piston-Exhaust Valve Clearance

RETARDING
Delays Intake Event Closes Intake
Keeps Intake Valve Open Later
Builds More High-End Power
Increase Piston-Intake Valve Clearance
Decrease Piston-Exhaust Valve Clearance
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Re: Lobe seperation - Manual vs Automatic

Post  schmitty on April 6th 2012, 8:18 am

Danny, good to see you again. Very Happy
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