Cam comparison question
11-17-2003, 11:24 PM
#1
TGO Supporter
Thread Starter
Join Date: Jul 2003
Location: Grand Rapids, MI
Posts: 4,803
Likes: 0
Received 0 Likes
on
0 Posts
Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
Cam comparison question
I am looking at 2 sets of cams for my car. i have a set of vortec heads, which i know flow best at around .500 lift. so im looking for a cam that is around that. i have settled on 2.
CAM 1 (Comp Xtreme Energy):
-Designation: XR270HR-10
-Duration @ 0.050": 218 / 224
-Max Lift w/ 1.5RR: .495 / .502
-Lobe Separation: 110
-Intake Centerline: 106
CAM 2 (suggested from cammotion.com):
-Grind Number: X2161-2201-10+4
-Duration (intake/exaust): 214/218
-Lift (intake/exaust) .498/.508
-Lobe Center Separation: 110
-Intake Centerline: 106
As you can see, they really only differ in the duration and probably cam grind design. like i said, i have vortec heads, casting #906. i will have upgraded to manley race flo 1.94/1.5 vavles and upgraded springs, retainers, etc...
on their site, Comp says the xtreme energy opens the valve faster and stuff, making it state of the art. i dont know about cam motion's cam. i need input on which cam to get. unless there is a crane cam of similarness. and yes, i need a hyd. roller cam. so which should i get? i want a strong mid range power. noticable idle. and no need to worry about the rest of the engine. i am building that to match the cam. (all i have is the block and heads so i will match the parts to the cam for RPM range)
CAM 1 (Comp Xtreme Energy):
-Designation: XR270HR-10
-Duration @ 0.050": 218 / 224
-Max Lift w/ 1.5RR: .495 / .502
-Lobe Separation: 110
-Intake Centerline: 106
CAM 2 (suggested from cammotion.com):
-Grind Number: X2161-2201-10+4
-Duration (intake/exaust): 214/218
-Lift (intake/exaust) .498/.508
-Lobe Center Separation: 110
-Intake Centerline: 106
As you can see, they really only differ in the duration and probably cam grind design. like i said, i have vortec heads, casting #906. i will have upgraded to manley race flo 1.94/1.5 vavles and upgraded springs, retainers, etc...
on their site, Comp says the xtreme energy opens the valve faster and stuff, making it state of the art. i dont know about cam motion's cam. i need input on which cam to get. unless there is a crane cam of similarness. and yes, i need a hyd. roller cam. so which should i get? i want a strong mid range power. noticable idle. and no need to worry about the rest of the engine. i am building that to match the cam. (all i have is the block and heads so i will match the parts to the cam for RPM range)
Last edited by Stekman; 11-17-2003 at 11:31 PM.
11-18-2003, 02:20 PM
#2
Supreme Member
Join Date: Jul 2001
Location: Palm Bay, Florida, USA
Posts: 3,931
Likes: 0
Received 0 Likes
on
0 Posts
Car: 95 E-150 & 07 Kawasaki ZX-6R
Engine: A slow one & a fast one
Transmission: A bad one & a good one
Axle/Gears: A weak one & a chained one
If you're looking for a strong low and mid range....a long duration cam will usually leech that away and add power up top. So given that, I would go for Cam 2.
11-18-2003, 06:06 PM
#4
Supreme Member
iTrader: (5)
Join Date: May 2001
Location: Naples, FL
Posts: 1,055
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 Firebird
Engine: 383 stroker
Transmission: T-56
Just don't forget that your cam needs to match up with your compression too. You didn't specify what you planned on running. If you're thinking less the 10:1, I would probably Cam 2 but if you were planning on running over 10:1, I might run Cam 1.
What I usually do when I pick a cam..is to use DD2000 and set up the motor with all the specs that I'm planning on using then start entering cam specs and track the different HP and TQ numbers. I usually don't pay much attention to the actual numbers as I do the the amount of change in the curves of the different cams. For example, I entered in about 6 different cams with the other motor specs staying the same, then I would average the HP and TQ numbers from 2000-5500rpm cause you really need the highest average HP and TQ over your rpm range instead of just peak. Anyway, that's how I do it.
What I usually do when I pick a cam..is to use DD2000 and set up the motor with all the specs that I'm planning on using then start entering cam specs and track the different HP and TQ numbers. I usually don't pay much attention to the actual numbers as I do the the amount of change in the curves of the different cams. For example, I entered in about 6 different cams with the other motor specs staying the same, then I would average the HP and TQ numbers from 2000-5500rpm cause you really need the highest average HP and TQ over your rpm range instead of just peak. Anyway, that's how I do it.
Thread
Thread Starter
Forum
Replies
Last Post
