Hard cam decision
Hard cam decision Im looking to buy a cam pretty soon and ive narrowed it down to three.Thunder racing raptor cam,england greens mayhem 2 cam, vengeance vrx5 cam. It will be my DD but i want some really good hp and tq numbers. It wont see the track very much, its mostly for street. Any ideas?
Thanks.
Thanks.
Last edited by 02blckss; Dec 5, 2010 at 05:25 PM.
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Brett Foote
TECH Senior Member
Joined: Feb 2009
Posts: 5,445
Likes: 4
go to the website or talk to Geoff at EPS,or Patrick-G.they do custom cams to match you head/intake flow and RPM needs.I don't totally understand cams but the EPS cams produce great results with smaller duration numbers.I plan on buying a cam from EPS myself.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Do a search for VRX5 on here and You Tube for videos/dyno graphs etc.
Give me a call if you have any other questions or would like to purchase a camshaft. We currently have 10% off all Comp products thru December to save you some cash!
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
I feel retarded explaining something to you Pred 
In all seriousness, ramps rates on Cam Motion cams are fast. On the exhaust side, the valve is open as the piston moves upward pushing the exhaust out. Right before the piston hits it the lifter starts on a downward slant. The ramps being quick on the Cam Motion will obviously yield to quick valve movements getting it away from the piston. Seems to me a softer ramp, everything else being the same, would move the valve slower and possibly make the valve be somewhat closer to the piston is said situation. I may be talking out of my *** though 
I am going to call the owner of Cam Motion (Kip) soon and talk over some details about their cams, and lobe design is gonna be one area I will pick his brain.
In all seriousness, ramps rates on Cam Motion cams are fast. On the exhaust side, the valve is open as the piston moves upward pushing the exhaust out. Right before the piston hits it the lifter starts on a downward slant. The ramps being quick on the Cam Motion will obviously yield to quick valve movements getting it away from the piston. Seems to me a softer ramp, everything else being the same, would move the valve slower and possibly make the valve be somewhat closer to the piston is said situation. I may be talking out of my *** though I am going to call the owner of Cam Motion (Kip) soon and talk over some details about their cams, and lobe design is gonna be one area I will pick his brain. 
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
One measures PTV from about 10* BTDC to about 10* ATDC, what affects PTV mainly is Duration and The valve events chosen.
The shape of the lobe (agressive or non) has very little effect at the durations we run in general. For exemple XER Comp lobes are more agressive than standard Cam motion such as FM13 and such.
The shape of the lobe (agressive or non) has very little effect at the durations we run in general. For exemple XER Comp lobes are more agressive than standard Cam motion such as FM13 and such.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
One measures PTV from about 10* BTDC to about 10* ATDC, what affects PTV mainly is Duration and The valve events chosen.
The shape of the lobe (agressive or non) has very little effect at the durations we run in general. For exemple XER Comp lobes are more agressive than standard Cam motion such as FM13 and such.
The shape of the lobe (agressive or non) has very little effect at the durations we run in general. For exemple XER Comp lobes are more agressive than standard Cam motion such as FM13 and such.
I also know that their shelf cams are designed by Kip the owner, and that they have been manufacturing cams since 1978. Thats 30+ years. I also got a personal invitation to call Kip and pick his brain about anything I'd like to know. And I will, soon.I know none of that really changes the bearing on your advice.....or maybe it does?
Last edited by 01ssreda4; Dec 8, 2010 at 12:02 AM.