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Author Topic:   rocker ratio
pearl jam3
Dirt Roller

Total posts: 14
posted December 28, 2002 09:30 PM
what, if any effects on vaccum readings would changing from a 1.5 rocker to a 1.6 rocker ratio? we currently have to pull 16 inches of vaccum at 1000 rpm. with the cam we run now it is not a problem but i was wondering if the 1.6 rocker would improve performance. also, does anybody know of a solid lift cam out there that will pull 16" at 1000 rpm?

16Again
Dirt Newbie

Total posts: 3
posted January 05, 2003 10:45 PM
I would not expect much change in vacuum from 1.5 to 1.6 rocker ratio. As there is only a few degrees increase in valve timing.
This is offset by about .030 increase in lift. Don't expect large gains in horsepower, I would guess around 7hp maybe 10hp at the most. A low lift cam will see more gain than a high lift cam.

pearl jam3
Dirt Roller

Total posts: 14
posted January 06, 2003 06:44 PM
thanks!

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