A quick analysis of Comp Cams using the info in the above link:

They've attempted to model their nomenclature after the very well known HKS cam grinds so one would be able to form rough expectations.

The overall lift is higher than the HKS equivalents, but the effective duration is slightly shorter. The Comp Cams' lifts are as follows:

264+ and 272+ - 11.0mm Int / 10.4mm Exh

280+ - 11.0mm Int & Exh


The Comp Cams' grinds use 104/112 lobe centerlines for the Int and Exh respectively. That means that when the cams are installed straight up, it's more or less like installing the respective HKS cams at +3/-1. My estimation is the Comp Cams will give a bumpier idle and bigger midrange torque than their HKS counterparts.

 

What about Revolver cams? Doesn't Revolver have 2 different cams or aren't they in the process of coming out with another?

 

Actually there may be a few in the works from them... Buschur may know a little about that

 

Here is the updated list. Perhaps a moderator would be kind enough to update the sticky with it.



Factory EVO
Advertised Duration - 260 deg Int / 256 deg Exh
Effective Duration - ___ deg @ 1mm Int / ___ deg @1mm Exh
Lift - 10.0mm Int / 9.5mm Exh
Lobe Centerlines - 109 deg Int /111 deg Exh
LSA - 110 deg

JDM EVO MR
Advertised Duration - 260 deg Int / 256 deg Exh
Effective Duration - ___ deg @ 1mm Int / ___ deg @1mm Exh
Lift - 10.0mm Int / 9.5mm Exh
Lobe Centerlines - 113 deg Int /112 deg Exh
LSA - 112.5 deg


Comp Cams 264+
Advertised Duration - 248 deg Int / 248 deg Exh
Effective Duration - ___ deg @ 1mm Int / ___ deg @1mm Exh
Lift - 10.8mm Int / 10.2mm Exh
Lobe Centerlines - 104 deg Int / 112 deg Exh
LSA - 108 deg
Upgraded valve springs recommended

Comp Cams 272+
Advertised Duration - 256 deg Int / 257 deg Exh
Effective Duration - ___ deg @ 1mm Int / ___ deg @1mm Exh
Lift - 10.8mm Int / 10.2mm Exh
Lobe Centerlines - 104 deg Int / 112 deg Exh
LSA - 108 deg
Upgraded valve springs recommended

Comp Cams 280+
Advertised Duration - 264 deg Int / 265 deg Exh
Effective Duration - ___ deg @ 1mm Int / ___ deg @1mm Exh
Lift - 11.0mm Int / 10.4mm Exh
Lobe Centerlines - 104 deg Int / 112 deg Exh
LSA - 108 deg
Upgraded valve springs recommended


GSC 264
Advertised Duration - 268 deg
Effective Duration - 194 deg @ 1mm
Lift - 10.6mm Int / 10.0mm Exh
Lobe Centerlines - ___ deg Int / ___ deg Exh
LSA - ___ deg
Stock valve springs OK

GSC 272
Advertised Duration - 281 deg
Effective Duration - 203 deg @ 1mm
Lift - 10.6mm Int / 10.0mm Exh
Lobe Centerlines - ___ deg Int / ___ deg Exh
LSA - ___ deg
Stock valve springs OK


HKS 264
Advertised Duration - 264 deg
Effective Duration - 206 deg @ 1mm
Lift - 10.8mm Int / 10.2mm Exh
Lobe Centerlines - 110 deg Int / 110 deg Exh
LSA - 110 deg
Stock valve springs OK

HKS 272
Advertised Duration - 272 deg
Effective Duration - 214 deg @ 1mm
Lift - 10.8mm Int / 10.2mm Exh
Lobe Centerlines - 110 deg Int / 110 deg Exh
LSA - 110 deg
Stock valve springs OK

HKS 280
Advertised Duration - 280 deg
Effective Duration - 222 deg @ 1mm
Lift - 10.8mm Int / 10.2mm Exh
Lobe Centerlines - 110 deg Int / 110 deg Exh
LSA - 110 deg
Stock valve springs OK


JUN 264
Advertised Duration - 264 deg
Effective Duration - ___ deg @ 1mm
Lift - 10.5mm
Lobe Centerlines - ___ deg Int / ___ deg Exh
LSA - ___ deg
Upgraded valve springs required

JUN 272
Advertised Duration - 272 deg
Effective Duration - 235 deg @ 1mm
Lift - 10.8mm
Lobe Centerlines - 110 deg Int / 115 deg Exh
LSA - 112.5 deg
Upgraded valve springs required


Piper Ultimate Road
Advertised Duration - 265 deg
Effective Duration - 217 deg @1mm Int / 211 deg @1mm Exh
Lift - 11.5mm Int / 10.8mm Exh
Lobe Centerlines - 108 deg Int / 107 deg Exh
LSA - 107.5
Upgraded valve springs required

Piper Rally
Advertised Duration - 265 deg
Effective Duration - 217 deg @ 1mm
Lift - 11.5mm
Lobe Centerlines - 108 deg Int / 107 deg Exh
LSA - 107.5
Upgraded valve springs required

Piper Race
Advertised Duration - 272 deg
Effective Duration - 224 deg @ 1mm
Lift - 12.0mm
Lobe Centerlines - 106 deg
LSA - 106 deg
Upgraded valve springs required


Revolver 262/264
Advertised Duration - 262 deg Int / 264 deg Exh
Effective Duration - 222 deg @ 1mm Int / 223 deg @ 1mm Exh
Lift - 11.4mm Int / 11.5mm Exh
Lobe Centerlines - 109 deg Int / 111 deg Exh
LSA - 110 deg
Upgraded valve springs required


Tomei Poncam
Advertised Duration - 260 deg
Effective Duration - ___ deg @ 1mm
Lift - 10.7mm Int / 10.2mm Int
Lobe Centerlines - 110 deg Int / 115 deg Exh
LSA - 112.5 deg
Stock valve springs OK

Tomei Procam
Advertised Duration - 280 deg
Effective Duration - ___ deg @ 1mm
Lift - 11.5mm Int / 11.5mm Exh
Lobe Centerlines - 110 deg Int / 115 deg Exh
LSA - 112.5 deg
Upgraded valve springs required

 

And here are the two Cosworth cam profiles:

Cosworth M1
Advertised Duration - 240 deg Int / 240 deg Exh
Effective Duration - ___ deg @ 1mm Int / ___ deg @1mm Exh
Lift - 10.2mm Int / 10.2mm Exh
Lobe Centerlines - 107 deg Int / 113 deg Exh
LSA - 110 deg
Upgraded valve springs recommended

Cosworth M2
Advertised Duration- 252 deg Int / 246 deg Exh
Effective Duration - ___ deg @ 1mm Int / ___ deg @1mm Exh
Lift- 11.0mm Int / 11.0mm Exh
Lobe Centerlines - 107 deg Int / 113 deg Exh
LSA - 110 deg
Upgraded valve springs recommended

 

CROWER CAMS SPEC SHEET ...







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Works 269:
Duration of 269 deg ???
Duration of ___ deg @ 1mm
Lift of 10.8mm intake / 10.1mm exhaust
Stock valve springs OK ???


Where's Buddy Club Cams ?


.

 

i bought a used evo...........how should i go about finding out if i have upgraded cams err no.... the same for my clutch..... cuz its a lil heavy ... just a lil thanx

 

Moderator: for the love of all that is good and wholesome....Make this a Sticky

Chris

 

Great Info.!!! Now which too pick from??

 

Thats gonna be dependant on what the car is going to be used for and driving style.

 

Sorry to resurrect this thread, but I'm trying to learn as much as I can about how cam specs affect everything. Can you please provide more in-depth info or point me in the right direction?

I ran across an old thread that I can't find for the life of me now, where somebody prominent in the DSM community (possibly David Buschur?) refers to a detailed article published in a performance magazine that he wrote on this exact subject matter but he also said that he couldn't find the links to the scanned article either.
Does anybody know of that article and if it's still available somewhere online?

 

Here is a decent one:

http://www.popularhotrodding.com/eng...ecs/index.html


And more . . .

http://www.google.com/search?q=cam+l...S&start=0&sa=N

 

thats some great info

 

yep.. great info