CHE vs Straub design

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Jun 17, 2021 | 10:39 AM

#21

grinder11

Race Director

Joined: Oct 2004

Posts: 12,861

Likes: 4,664

Quote:

Originally Posted by mikeCsix

Are there power gains using higher ratio rocker arms? If so, what is the usual gain?

Short answer is yes. Many argue they don't increase duration, only lift. Technically, that may be true. BUT-If they increase lift from stock 1.7 ratio, say from .590" to .615", you will now have increased duration from .591" to .615" lift, because there was NO duration before at .591"-.615" lift, because there was no .591"-.615" lift before. Hope this makes sense.......

Jun 17, 2021 | 01:45 PM

#22

mikeCsix

Melting Slicks

Joined: Jul 2010

Posts: 2,999

Likes: 242

From: Surprise, Az

Quote:

Originally Posted by grinder11

It makes sens Grinder, thanks!

Jun 17, 2021 | 03:51 PM

#23

hubes

Burning Brakes

Joined: Jul 2002

Posts: 1,129

Likes: 99

From: Nova Scotia

Quote:

Originally Posted by grinder11

Actually you'll have slightly increased duration everywhere, but its minor. Duration is usually measured at 0.050" lift, and with the increased ratio you'll get there earlier and stay longer, so your duration will be slightly increased. Since the lift at every point is multiplied by 1.059, duration everywhere above 0 will be slightly increased, but it will be increased more at higher lift. Your opening and closing points are unchanged

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