How 1.9 rocker work? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 10-06-2005, 09:18 PM   #11
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What your friend doesn't realise is the rocker is not longer, in fact most of them are modified stock rockers.

The end of the rocker that contacts the valve doesn't get changed.

The location of the pushrod is changed on the high ratio rockers to be closer to the fulcrum (bolt and bearing) thereby changing the ratio.

If you compare a stock rocker to a modified high ratio rocker you'll notice the pushrod hole is further from the fulcrum (pivot point) on the stocker and closer on the high ratio.

Does your friend think the hundreds of high ratio rockers already installed on these don't work and actually keep the valve open

Cheers,
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Old 10-06-2005, 09:37 PM   #12
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Quote:
Originally Posted by Rogue
The rocker is actually different where the pushrod meets with it. The fulcrum of the rocker and the tip where it connects to the valve never changes. The seat where the pushrod sits in the rocker arm is moved away from teh valve and the angle of the pushrod changes slightly.

he still have doubt, but said "...may be..." finaly but it seem hard

anyway, he will see when my PB will drop after the install

Thx Todd, i learn more and more each time i connect on that forum.


Mike
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Old 10-10-2005, 03:28 AM   #13
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Explain to him that all the rocker does is multiply the lift of the cam. So the stock rockers multiply it by 1.6 to get your stock valve lift. 1.9 rockers multiply it by 1.9 to give you more lift. But what happens when you multiply 0 by 1.9??? You get 0. So when the cam has no lift, the valves don't open. If your friend knows basic multiplication he should understand this.

Shawn
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