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Roller Rockers

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Old Jun 2, 2014 | 02:19 PM
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Default Roller Rockers
I am exploring upgrades for the bike, heads, cams, and a boost in compression via a 107 setup. If running a .590 to .625 lift cam are roller rockers necessary for a street setup?

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Old Jun 2, 2014 | 02:23 PM
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Not with 590 lift cams and most will tell you that rollers would be a good idea with 625 lift cams; I think that is debatable. I run TMan's 600SM cams with OEM rockers with no issues. I would probably try OEM rockers with 625 lift cams before spending the money on a set of rollers. Rollers will be noiser than OEM.
 
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Old Jun 2, 2014 | 02:43 PM
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.590 is right on the edge,ide lean towards the r. rockers if I was building the motor
 
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Old Jun 2, 2014 | 03:05 PM
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Thanks for the opinions, is the issue with the oem rockers to much friction or does the larger lift put to much side pressure on the guide due to the geometry?
 
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Old Jun 2, 2014 | 03:12 PM
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I think .600 is the break point. I'm running them at .550 just because I had a set laying around. They make a little noise...
 
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Old Jun 2, 2014 | 03:14 PM
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If on the cusp of roller rockers how about S&S's forged non roller rockers? They have longer bushings and are stronger than OEM?
 
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Old Jun 2, 2014 | 03:48 PM
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Originally Posted by soft 02
If on the cusp of roller rockers how about S&S's forged non roller rockers? They have longer bushings and are stronger than OEM?
I've tried those numerous times, trying to quiet a bike down. I never saw any difference over stock. What did help a very small bit was measuring the shafts and fitting the rockers as close as possible.

120r does not have rollers and thats good enough for me, BTW.
 
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Old Jun 2, 2014 | 09:40 PM
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Truk, does the 120 have a different rocker assembly or is the same as a stock 103. Just curious.
 
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Old Jun 3, 2014 | 06:32 AM
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On high-lift cams, the roller tip eliminates the increased scrubbing back and forth generated by cams of that nature.
Another aspect is the accuracy of the machined C/L of the roller tip.
Scott
 
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Old Jun 12, 2014 | 09:39 PM
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Originally Posted by wurk_truk
I've tried those numerous times, trying to quiet a bike down. I never saw any difference over stock. What did help a very small bit was measuring the shafts and fitting the rockers as close as possible.

120r does not have rollers and thats good enough for me, BTW.
Is there any particular reason this eng doesn`t have rollers? I have been wondering this since I have this engine, and the top end is rather noisy? They tell me it`s because of the steep ramp on the cams.
 
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