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Old 11-06-2002, 09:57 AM
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Post 1.5 and 1.6 rockers

What is the benifit of haveing 1.5 rockers over the intake valves and 1.6 rockers over the exhaust valves. Summit sells a set of 16 rockers, 8 are 1.5, and 8 are 1.6. Ive seen this set up on cirlc track engines. Im sure it gives more lift to the exhaust valves, but what advantage does this have?
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Old 11-06-2002, 10:17 AM
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Many engines benifit from a longer duration cam on the exhaust side. This helps with exhaust scavenging to keep the intake charge as clean as possible. Makes a bit more power...

Chris
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Old 11-06-2002, 11:35 AM
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Most people unless the exhaust port is really bad will run the 1.6 rockers on the intake valve. This combination does show some improvement on the dyno. The reason why is where the difference in opinion comes from. Most believe (and I do too)it's due to the increased area under the curve on the intake stroke without the drawbacks of too much duration. On a standard .842 SBC lifter the rate of lift per degree maxes out around .007 using a higher ratio will open the valve quicker without having to go to a larger diameter lifter. Thus making for a seemingly more aggressive cam profile.
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Old 11-06-2002, 06:59 PM
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Doesn't a cam with a split profile do the same thing? It has a higher lift on the exhaust side. Just a thought!
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