More stupid cam questions
Thread Starter
Team Owner
Joined: Apr 2002
Posts: 62,198
Likes: 1
From: All humans are vermin in the eyes of Guru VA
Cruise-In IV Veteran
Cruise-In V Veteran
More stupid cam questions
Here are some dyno graphs of cams
X-treme energy 268 Hydraulic flat-tappet camshafts
X-treme energy 270 Hydraulic roller
Looking at these dyno graphs makes me wonder why I would want to goto a hydraulic roller cam? They are practically the same, whats up with that?
X-treme energy 268 Hydraulic flat-tappet camshafts
X-treme energy 270 Hydraulic roller
Looking at these dyno graphs makes me wonder why I would want to goto a hydraulic roller cam? They are practically the same, whats up with that?
Drifting
Joined: Sep 2001
Posts: 1,427
Likes: 1
From: Boxford Mass
Re: More stupid cam questions (Guru_4_hire)
Those cams are almost identical except for one is a roller. The whole point of a roller is you could go with a more aggressive grind while maintaining a smooth idle and keeping vacuum.
There is minimal benefit when the grind is the same. Less friction but that won't help the numbers much. Why not step it up to a 280HR !
[Modified by Jack71, 9:19 PM 8/30/2003]
There is minimal benefit when the grind is the same. Less friction but that won't help the numbers much. Why not step it up to a 280HR !
[Modified by Jack71, 9:19 PM 8/30/2003]
Thread Starter
Team Owner
Joined: Apr 2002
Posts: 62,198
Likes: 1
From: All humans are vermin in the eyes of Guru VA
Cruise-In IV Veteran
Cruise-In V Veteran
Re: More stupid cam questions (Jack71)
I guess looking at the springs I have I am gonna have to stick with a flat tappet cam -- I cant afford to be machining the heads and buying new springs and retainers and stuff like that
Thread Starter
Team Owner
Joined: Apr 2002
Posts: 62,198
Likes: 1
From: All humans are vermin in the eyes of Guru VA
Cruise-In IV Veteran
Cruise-In V Veteran
Re: More stupid cam questions (Jack71)
Oh well, I guess I will investigate more options
I have some aftermarket pro-topline torker heads, and I am trying to hit 400hp on 9.5 compression headers and some form of a dual plane intake(so I can get rid of this damn single plane that came on the car :cuss )
I have some aftermarket pro-topline torker heads, and I am trying to hit 400hp on 9.5 compression headers and some form of a dual plane intake(so I can get rid of this damn single plane that came on the car :cuss )
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Re: More stupid cam questions (Jack71)
Hydraulic rollers don't seem to be that much better than flat tappet cams. I do beleive however you can run more lift with the same duration as flat tappet and in theory make the same power with less duration or more power with the same duration which everway you want to look at it.
I just bought a solid roller cam today, Comp Cams XR280, over .570 lift and 245 duration, going to put it in the 427ci small I am building :D
[Modified by MotorHead, 11:03 PM 8/30/2003]
I just bought a solid roller cam today, Comp Cams XR280, over .570 lift and 245 duration, going to put it in the 427ci small I am building :D
[Modified by MotorHead, 11:03 PM 8/30/2003]
Melting Slicks
Joined: Sep 2002
Posts: 2,783
Likes: 2
From: Engineers do it better.
Re: More stupid cam questions (MotorHead)
I just bought a solid roller cam today, Comp Cams XR280, over .570 lift and 245 duration, going to put it in the 427ci small I am building :D
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Team Owner
Joined: Apr 2002
Posts: 62,198
Likes: 1
From: All humans are vermin in the eyes of Guru VA
Cruise-In IV Veteran
Cruise-In V Veteran
Re: More stupid cam questions (Jack71)
1.6 rockers would net me .528 lift and I dont think the springs would be happy with that
Melting Slicks
Joined: Jun 2002
Posts: 2,844
Likes: 99
From: Orrtanna Pa.
Re: More stupid cam questions (Guru_4_hire)
I can't believe the roller cam setup is worth the cost for what little gain either.You can make incredible power with a hydraulic flat tappet cam,and if you don't mind adjusting valves,go solid.I myself am at a point where I'm happy with the power,but for the next go around may play with lobe centers to crispen up the throttle responce a bit.I figure I've got at least 4 cam changes staying with a hydraulic before I'd spend the same amount on a roller.That's quite a bit of experimentation.
Thread Starter
Team Owner
Joined: Apr 2002
Posts: 62,198
Likes: 1
From: All humans are vermin in the eyes of Guru VA
Cruise-In IV Veteran
Cruise-In V Veteran
Re: More stupid cam questions (The Money Pit)
Oh well -- I am trying for 400+ on my torker cylinder heads. Might need a port job on them at some point
Pro
Joined: Jun 2002
Posts: 544
Likes: 0
From: La Jolla California
Re: More stupid cam questions (The Money Pit)
Hydraulic rollers allow you to run a more radical cam (and thus, make more power) that behaves like a smaller cam at idle. As someone mentioned earlier, it doesn't make any sense to compare hp/tq numbers on a flat tappet vs a hydraulic roller with the same grind - of course they'll be the same. Now if you compare a flat vs roller based on similar idle/low speed behavior, you'd find that the hydraulic would make alot more power. Hydraulic rollers are just the best way to get the most power out of a street ride. Why else would the OEMs use them?
