Roller Rockers?
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Elite HDF Member
Joined: Nov 2005
Posts: 3,654
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From: Mansfield Texas
Roller Rockers?
Good Idea to go with roller rocker arms with a .575 lift cam in a 103 TC ?
I have read over 600 lift yes. The actual cam is a Woods TW 777.
I have read over 600 lift yes. The actual cam is a Woods TW 777.
Last edited by barrygreen; Jan 19, 2019 at 02:34 PM.
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Joined: May 2018
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From: Viet Vet, crossroads
Roller tips are a good thing IF you use quality stuff
They do a couple things for high lift cams
Less parasitic drag and less wear on the guide from the valve wanting to go sideways.
As far as when the Lift becomes too much for scrub tappets is always an argument.
However, I feel the answer is- when in doubt do it, as it will never hurt anything even for lower lift cams.
If I had to pick a mandatory lift number for rollers it would be around the high 500 mark, perhaps conservative, but safe.
They do a couple things for high lift cams
Less parasitic drag and less wear on the guide from the valve wanting to go sideways.
As far as when the Lift becomes too much for scrub tappets is always an argument.
However, I feel the answer is- when in doubt do it, as it will never hurt anything even for lower lift cams.
If I had to pick a mandatory lift number for rollers it would be around the high 500 mark, perhaps conservative, but safe.
HDF Community Team
Joined: Jun 2006
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From: san antonio
Not required and will make more noise than OEM rockers. Running OEM rockers with TMan 600SM cams in an all bore 107 and S&S rollers rockers on my higher compression 98" motor with CR595 cams; the 107 can barely hear the valve train in the 107 but not so much with the 98". Not annoying, just saying you will hear roller rockers over OEM. IMHO, not worth the $$, nothing to be gained on the dyno and the miles that most of us put on these bikes, guide wear is not an issue.
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From: Viet Vet, crossroads
Guide wear is a pretty big deal esp if we are talking performance.
If we have a big cam , we have big springs, and we might just have a lot of other stuff too!
My 50 deg cut valves and seats, way narrow, and way to the top of the margin would not like any lateral thrust at all.
The narrow high angle seats are prolly only good for 20K anyway.
They don't need the extra thrust tax .
So there is no blanket statement or a general fix for everyone here.
But when in doubt and already there....rollers look pretty appetizing, in my opinion,
but WtH do I know.
If we have a big cam , we have big springs, and we might just have a lot of other stuff too!
My 50 deg cut valves and seats, way narrow, and way to the top of the margin would not like any lateral thrust at all.
The narrow high angle seats are prolly only good for 20K anyway.
They don't need the extra thrust tax .
So there is no blanket statement or a general fix for everyone here.
But when in doubt and already there....rollers look pretty appetizing, in my opinion,
but WtH do I know.
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Joined: Sep 2009
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From: deland,florida
use the $$ for something that will make a difference,like headwork.we recommend roller rockers at .600 but have done many .625 and up to .650 with OEM rockers.
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Road Warrior
Joined: May 2011
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From: florida
Like Kirby said many higher lift combos wout rollers. Some shops complain they make noise so they prefer OEM. I run stock on a .630 cam build, and use the SnS rollers on a wood 9f build which happens to be one the quieter valvetrains I’ve had.
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From: Viet Vet, crossroads
Is not part of the problem with noise the screwed up rocker geometry from HD?
In this day and age are they are still screwed up, up to twinks anyway?
There are people out there that will reconfigure them.(and add roller tips)
In this day and age are they are still screwed up, up to twinks anyway?
There are people out there that will reconfigure them.(and add roller tips)
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Joined: Dec 2007
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Roller rockers can contribute to increased valvetrain noise. Proven fact.
We have had clients on strict budgets that opted out many times, and have incredibly quiet valvetrains on even very aggressive cams.
Are they a 100% "need"?......no.
Scott
We have had clients on strict budgets that opted out many times, and have incredibly quiet valvetrains on even very aggressive cams.
Are they a 100% "need"?......no.
Scott