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Cam Lift Calculation

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Old 03-22-2003, 02:14 PM   #1
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Car: 1987 Camaro IROC Z-28
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Cam Lift Calculation

Does anyone know an equation for calculating cam lift? I've got an SLP cam I bought from a guy on a message board and he didn't know exact specs. The cam model is 51006 and it is not on the SLP website. Thanks.

Ryan
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Old 03-22-2003, 02:26 PM   #2
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CF87,

There is no "calculation", per sŤ, without measuring the minor and major diameters of the cam lobes. Once you know the lobe lift (the difference between the two), you can multiply that by the rocker arm ratio (1.5 for stock rockers) to calculate gross valve lift.
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Old 03-22-2003, 03:18 PM   #3
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okay. so then measure the base circle, take that (about 1.865 inches) and subtract the lobe (about 1.520 inches) and then multipy by 1.5? Thanks.

Ryan
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Old 03-22-2003, 08:45 PM   #4
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That will give you valve lift, to get cam lift don't multiply by 1.5 or 1.6 depending on rocker arm ratio.
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Old 03-23-2003, 10:59 AM   #5
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Re: Cam Lift Calculation

Quote:
Originally posted by CamaroFreak87
The cam model is 51006 and it is not on the SLP website. Thanks.

Ryan
This is information on the 51006 I got from SLP when I bought that same camshaft. (BTW, it's a pretty mild camshaft)

Told to me over the phone by SLP:

At .50
intake open 1- btdc
exhaust 50 bbdc
close intake 39 abdc
close exhause 6- atdc
3 degrees advance built into it
____________________________________________
Off their web site:

Camshaft Specs: Valve Lift Duration [email protected]
in: .495" 270 218
ex: .502" 276 224

SLP hydraulic roller camshafts are designed for 5.0L (305) and 5.7L (350) TPI engines in computer controlled, street driven Camaros, Firebirds, Corvettes and Impala SS. We've put a lot of dyno and road testing into these camshafts to ensure good driveability, acceptable idle and compatibility with all electronic engine controls, including the computer Mass Air Flow sensor. Power gains as high as 30 extra horsepower in a Tuned Port 305 and 35 in a 350 can be achieved, depending on the application. Dyno testing has also shown these cams will substantially improve the performance of 305 and 350 engines equipped with four barrel carburetors. SLP cams work equally well in manual or automatic transmission-equipped cars. 1987-97 TPI engines can reuse the factory lifters. All other applications will need to use Speed-Pro roller lifters (Part #HT5000RA), which are not included.

______________________________________________


It's almost identical to a crane 119821 in DD2000, according to my two year old notes.

Hope this helps!
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Old 03-23-2003, 12:11 PM   #6
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Thanks SMasterson
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