Blower Cams and Overlap

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Mar 22, 2005 | 03:04 PM

moregrip

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Blower Cams and Overlap

How many degrees of overlap is typical on a blower Cam? I'm talking general here folks.

Mar 22, 2005 | 05:05 PM

Mr. Sandog

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From: Sun Diego

0*, or less (negative).

Mar 22, 2005 | 05:54 PM

whitt1

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From: memphis tn

Mine is 228/234 .588/.598 115LS +4 and has 0 degrees of overlap.

Mar 22, 2005 | 06:31 PM

moregrip

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Quote:

Originally Posted by whitt1

Mine is 228/234 .588/.598 115LS +4 and has 0 degrees of overlap.

what are the valve events for this cam @ .006?

Naked, what are yours @ .006?

Mar 22, 2005 | 06:37 PM

BigTex

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Hmmmm, I calculate that as 1* of overlap at .050. Of course you do have lots of overlap below .050 lift.

Mar 22, 2005 | 06:38 PM

whitt1

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Quote:

Originally Posted by moregrip

what are the valve events for this cam @ .006?

Naked, what are yours @ .006?

273/283 but I'm running 1.75 rockerarms so the lift is .605/.615.

Mar 22, 2005 | 06:39 PM

Sport Side

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From: Tallahassee, FL

228*-234*
x-er

Intake Valve opens - IVO 27.5
Intake Valve closes - IVC 69.5
Exhaust Valve Opens - EVO 80.5
Exhaust Valve Closes - EVC 22.5
Exhaust Centerline - ECL 119
Overlap 50

- ivo = atdc
- evc = btdc

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Mar 22, 2005 | 06:40 PM

whitt1

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From: memphis tn

Quote:

Originally Posted by BigTex

Hmmmm, I calculate that as 1* of overlap at .050. Of course you do have lots of overlap below .050 lift.

How are you calculating overlap without advertised duration?

Mar 22, 2005 | 06:41 PM

moregrip

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Quote:

Originally Posted by SportSide 5.3

228*-234*
x-er

Intake Valve opens - IVO -36.5
Intake Valve closes - IVC 5.5
Exhaust Valve Opens - EVO 16.5
Exhaust Valve Closes - EVC -41.5
Exhaust Centerline - ECL 119
Overlap -78

- ivo = atdc
- evc = btdc

something like this:

Overlap: 78.00 degrees
Intake Duration: 222.00 degrees
Exhaust Duration: 238.00 degrees
Intake Installed Centerline of 74.50 degrees ATDC.
Exhaust Installed Centerline of 77.50 degrees BTDC.