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08-18-2003, 11:24 AM
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#1 |
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Registered User
Join Date: May 2000
Location: Flin Flon, Manitoba, Canada
Posts: 8,853
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cam specs question
Is this a fairly lumpy cam? I don't really know how to read cam specs
Intake open 42 before TDC close 78 after BDC Cam lift .298 valve lift .448 Valve dish .030 Hot Exhaust open 78 before BDC close 42 after TDC cam lift .298 valve lift .448 valve lash .030 hot Can you guys shed some light on how to read these specs and let me kow if this is a nice sounding cam Thanks
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My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795 |
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08-18-2003, 11:31 AM
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#2 |
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Account Suspended
Join Date: Mar 2001
Location: Virginia Beach, Va. U.S.A.
Posts: 15,320
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Do you know what the LSA is? That cam sounds like it might have a little lope to it. I'm assuming that the 298 is the duration?
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08-18-2003, 11:31 AM
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#3 |
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Registered Cruiser
Join Date: May 2002
Location: Las Vegas NV
Posts: 2,230
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What are those specs. from. Is that an OEM solid cam?
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I intend to live forever. So far, so good. |
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08-18-2003, 12:38 PM
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#4 |
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Registered User
Join Date: Mar 2003
Location: Northern Illinois
Posts: 2,181
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Wow,
If I'm reading that right, the exhaust opens 78 BEFORE BDC, and the intake CLOSES 78 AFTER BDC. That would give you 156 degrees of overlap!!! If I'm reading that right, this is one DOOSIE of a lumpy cam! The mild cams I'm looking at have about 35 degrees of overlap! Brian |
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08-18-2003, 12:49 PM
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#5 |
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67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,856
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Tim, It sounds like 292 duration but that seems high for a lift of .448. Maybe it is a solid cam, I don't know. The idle Lumpiness is from the LSA that Randy mentioned. I believe most of the sound is from the duration under acceleration. What brand cam is this?
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
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08-18-2003, 01:02 PM
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#6 |
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Senior Member
Join Date: Aug 2002
Location: Valley Center KS
Posts: 3,525
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I'm guessing it's a solid lifter cam since it has lash adjustment specs. The cam lift is how much it lifts the lifter (.298"). Multiply that by your rocker ratio (stock SBC is 1.5) to get valve lift (.447")
duration at .050 lift and LSA would help out. |
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08-18-2003, 01:03 PM
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#7 |
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Registered User
Join Date: May 2000
Location: Flin Flon, Manitoba, Canada
Posts: 8,853
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It's an Iskenderian racing cam. These are the specs from the cam that is in the 283 I just bought for Shawnas 67 GMC project.
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My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795 |
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08-18-2003, 01:07 PM
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#8 |
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Registered User
Join Date: May 2000
Location: Flin Flon, Manitoba, Canada
Posts: 8,853
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here is a scanned copy of the specs tag
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My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795 |
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08-18-2003, 01:18 PM
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#9 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Cam has 32* of overlap at .050 lift( In. open-Ex close) And 248* of duration at .050 lift. Should be ok for your 283 with some "sound" to it.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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