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Posted: Tue Jan 09, 2007 12:08 am 
Getting Side Ways
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xcabbi wrote:
What's the rev ceilling of a hydraulic roller cammed motor compared to a hydraulic flat tappet cammed motor? Provided that you use suitable valve springs.


The rollers dont really give you more of a rev limit. The reason they are used is the ramp on the cam can be steeper, so your at high lift for longer for same total open duration.

If you want a really silly rev limit, solids are the only way to go. I know a few Clevo's that rev limit at 8200rpm (racing only, 600-700hp). These all run solid rollers.

 

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Posted: Tue Jan 09, 2007 12:09 am 
Getting Side Ways
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auxr83 wrote:
windsor baby


auxr83, if you've got nothing useful to say keep your mouth shut !!!!!!!!!

 

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Adrian
EF Fairmont, 5.0Lt, Pacemaker Headers, Sports cats, Redback muff, T5 manual, 16" Tickford rims, Tickford "Body Styling", DBA Gold Rotors, Heritage Green, JVC MP3
XB Coupe, 351C, twin system, C4 shift kitted auto, 9" LSD, Eccose Blue, very loud !!!!

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Posted: Tue Jan 09, 2007 11:23 pm 
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Hyd roller lifters are actually heavier than std and combined with the steep ramps on the camshaft can actually limit top rpm due to lifter float.
Of course if you build your engine right you don't need to rev it hard.
My cleveland made around 350 rwhp @ 5700rpm and loads of torque and that's even with my compromised intake. The cam I used has .612 lift yet only 230 degrees duration @ .050".

Pete.
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Posted: Thu Jan 11, 2007 2:32 pm 
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i use a solid roller with 712' lift with tripple valve springs to make her shut in time :twisted: :twisted: cam stops producing power at 7300rpm but she will rev well over 8000rpm :D :D

 

 

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