Cam overlap help specs inside! 581/581

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Jun 12, 2005 | 06:39 AM

Public

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Launching!

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Cam overlap help specs inside! 581/581

Ok I dont see the exact numbers I need to input to get the overlap for this cam. It has @ .50 numbers so maybe one of you guys knows how. thanks!

Comp Cams XE-R 224/224, .581/.581 112 LSA

Part #: 54-000-11
Grind #: LS1 3722R/3722R HR112 LS1 Speed
Serial #: C 7622

Int. Exh.
Valve Adjustment HYD HYD
Gross valve lift .581 .581
Duration @
.006" Tappet Lift 273 273

Valve Timing Open Close
@ .050" Int. 0 BTDC 44 ABDC
Exh 44 BBDC 0 ATDC
These specs are for cam installed @ 112 intake
center line
Int. Exh.
Duration @ .050 224 224
Lobe Lift .3420 .3420
Lobe Separation 112.0

Jun 12, 2005 | 06:50 AM

Sport Side

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From: Tallahassee, FL

0* @ .05''

(Intake duration + Exhaust duration) / 2 - ( 2 * LSA ) = Overlap
(224 + 224) / 2 = 224 - (2 * 112) = 0*

Jun 12, 2005 | 06:54 AM

Public

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Launching!

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Quote:

Originally Posted by SportSide 5.3

0* @ .05''

(Intake duration + Exhaust duration) / 2 - ( 2 * LSA ) = Overlap

Thanks man!

Jun 12, 2005 | 01:47 PM

BriancWS6

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From: The Garage

Uh....I beleive that is the wrong way to determine overlap. Here is how I always do it and what I have always seen on here as the formula.

Intake duration @.050 + exhaust duration @ .050, Divided by 4, minus LSA, X 2

Jun 12, 2005 | 01:50 PM

BriancWS6

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That answer of 0* @ .050 is correct though, I've never seen it done that way though.

Jun 12, 2005 | 02:24 PM

blkZ28spt

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From: The South

Quote:

Originally Posted by BriancWS6

Intake duration @.050 + exhaust duration @ .050, Divided by 4, minus LSA, X 2

That's the way I've seen. You can use the same formula, AFAIK, to determine the overlap at any point that you know the duration for. Most common numbers are @.050.

Jun 12, 2005 | 03:12 PM

Public

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Launching!

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So how is this cam for MPG and streetability. Looks mild enough for daily driver or weekend car but not sure on the MPG hit? I'm looking at an STS with this cam.

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Jun 12, 2005 | 05:24 PM

blkZ28spt

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From: The South

Quote:

Originally Posted by Public

So how is this cam for MPG and streetability. Looks mild enough for daily driver or weekend car but not sure on the MPG hit? I'm looking at an STS with this cam.

Do some searches. There is a LOT of info on this site regarding 224/224 cams. They are the "bread and butter". Big enough to make good power (380-400 rwhp cam only in M6) and have a slight lope if on a 112 yet small enough to drive virtually like stock on a good tune.