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do roller rocker arms add HP +++++ ?
Home away from home
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2008/3/30 12:52
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I was watching engine masters and saw this test and saw this https://youtu.be/TvQHgt-tF7Y The two alu rockers were different ratios and produced diff results so how do you know what the correct ratio is for your A series. Just by the way there was also this https://youtu.be/8VjFZMKvEwY How does the rocker ratio and cam /cam lift etc work together? I see yellaterra also has diff ratio's

Posted on: 1/8 13:21

Edited by nismo1 on 2018/1/8 16:04:49
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Re: do roller rocker arms add HP +++++ ?
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A 1.5:1 rocker will move a valve 1.5 times the lift of the cam. A 1.6:1 rocker / 1.6 times which equates to roughly a 5 to 6% increase in valve lift thus gaining a few extra hp. Dont think it affects duration but do put less load on the valve and add to longevity / friction.. Worth it ?? Just depends on engine setup and how you value your motor. A-series have a pretty tough rocker from factory. I am using them which needed a higher tower. My motor is not fully assembled yet so no testing too.

Posted on: 1/8 17:49
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Re: do roller rocker arms add HP +++++ ?
Home away from home
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So if i understand you,you also using roller rockers.If i may ask where did you get them cos i see there is quite a few places that sell them.

Posted on: 1/8 18:43
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Re: do roller rocker arms add HP +++++ ?
Home away from home
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Check this out a DIY head job making 92hp more than std. Extra large intake by making changes to the head ---How they change the pushrods then? https://youtu.be/aijyLKCvbU8

Posted on: 1/8 18:49
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Re: do roller rocker arms add HP +++++ ?
No life (a.k.a. DattoMaster)
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I run rollers
I get alot more lift from them as I run 1.65 ratio
However... the rocker is heavier... so I don't rev it as hard and try to keep my redline around 7600
People with std rockers can run higher rpm... but I get alot more valve lift and airflow than most

Mine are yella terra
Don't think you can get them anymore unless special order

Posted on: 1/9 11:50
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