What difference make 1.7 or 1.8 rockers???
1.8 rockers will provide a little more lift and the overlap triangle opens a bit. They won't change valve events. Depending on the replacement 1.8 rocker, yes new pushrods will be required. Regardless, new valve springs are required.
This is an expensive upgrade for the amount of hp gained. Used with a GM Hot Cam or ASA cam they might be worthwhile though.
This is an expensive upgrade for the amount of hp gained. Used with a GM Hot Cam or ASA cam they might be worthwhile though.
1.8 rockers will provide a little more lift and the overlap triangle opens a bit. They won't change valve events. Depending on the replacement 1.8 rocker, yes new pushrods will be required. Regardless, new valve springs are required.
This is an expensive upgrade for the amount of hp gained. Used with a GM Hot Cam or ASA cam they might be worthwhile though.
This is an expensive upgrade for the amount of hp gained. Used with a GM Hot Cam or ASA cam they might be worthwhile though.
Launching!
Joined: May 2012
Posts: 209
Likes: 1
From: NC
One aspect of larger ratio rockers is the relative decreased time differences of smaller ratios when looking at the increased valve velocities with either intake or exhaust valves. Decreased time with increased velocity means a better ability to maximize potential airflow of the heads cross sectional area quickly and efficiently. Usually with larger ratio rockers and/or aftermarket cams it would also be wise to consider lighter valves in effort help decrease rotational valvetrain mass.
TECH Regular
Joined: Feb 2008
Posts: 458
Likes: 1
From: Keller, Texas
One aspect of larger ratio rockers is the relative decreased time differences of smaller ratios when looking at the increased valve velocities with either intake or exhaust valves. Decreased time with increased velocity means a better ability to maximize potential airflow of the heads cross sectional area quickly and efficiently. Usually with larger ratio rockers and/or aftermarket cams it would also be wise to consider lighter valves in effort help decrease rotational valvetrain mass.
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