roller rocker ratios enquiry
Thread Starter
Instructor
Joined: Jul 2007
Posts: 117
Likes: 0
roller rocker ratios enquiry
hello guys,
i recently just brought a set of comp cam pro magnum 1.6 ratio roller rockers to go on my L98 engine when i get my new larger ported heads next year and to go with my mini ram intake !
any way i recently read that some engine builders run 1.6 ratio on intake side and 1.5 ratio on exhaust side.
or may be that was the other way around ,cant remember.
so is this a good idea please?
is it neccesary and what gains can be achieved please ?
more rpms or less may be ? or may be more or less torque ?
is worth it ?
thank you
tyson
i recently just brought a set of comp cam pro magnum 1.6 ratio roller rockers to go on my L98 engine when i get my new larger ported heads next year and to go with my mini ram intake !
any way i recently read that some engine builders run 1.6 ratio on intake side and 1.5 ratio on exhaust side.
or may be that was the other way around ,cant remember.
so is this a good idea please?
is it neccesary and what gains can be achieved please ?
more rpms or less may be ? or may be more or less torque ?
is worth it ?
thank you
tyson
Last edited by prism_kiter; Jul 27, 2007 at 06:39 PM.
Burning Brakes
Joined: Aug 2006
Posts: 1,061
Likes: 99
From: Seattle WA
There's really no need to stagger the ratios unless you can't get the cam that you want. Many cams have split lift and duration anyway that keep the exhaust valve open longer than the intake.
The only benefit I see is that you can change them out quickly with the same effect of switching to a cam with a slightly different grind. Might be useful if doing dyno tuning, etc...
The only benefit I see is that you can change them out quickly with the same effect of switching to a cam with a slightly different grind. Might be useful if doing dyno tuning, etc...
Drifting
Joined: Feb 2003
Posts: 1,978
Likes: 2
From: San Antonio Texas
You got it right; some run 1.6 on the Intake only. This is usually on serious race-type motors though. With a really big cam, there's usually enough lift on the Exhaust that the 1.6 really doesn't add anything extra, according to some. But Intake ports (SBChev) do seem to like a lot of lift. You can also compensate for weak intake or exhaust ports with the cam grind. On a street/strip motor just go with 1.6 RR on both.
Pro
Joined: Jun 2005
Posts: 734
Likes: 0
From: Austin TX
You got it right; some run 1.6 on the Intake only. This is usually on serious race-type motors though. With a really big cam, there's usually enough lift on the Exhaust that the 1.6 really doesn't add anything extra, according to some. But Intake ports (SBChev) do seem to like a lot of lift. You can also compensate for weak intake or exhaust ports with the cam grind. On a street/strip motor just go with 1.6 RR on both.
but I've just never heard of anything like this.
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