Run down on HIgh Ratio Rockers

Do you like to go fast? Well get out of that stocker and build a hipo motor for your VW. Come here to talk with others who like to drive fast.

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theKbStockpiler
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Joined: Sun Jul 15, 2012 12:25 pm

Run down on HIgh Ratio Rockers

Post by theKbStockpiler » Tue May 22, 2018 10:35 pm

Hi, I'm aware of what High Ratio Rockers are and what they do but why are the cams specific to them?
Thanks for your expertise!
Super beetle with attitude

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andy198712
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Re: Run down on HIgh Ratio Rockers

Post by andy198712 » Wed May 23, 2018 4:38 pm

How much lift the cam has,

So say a cam designed for non ratio rockers (1.1) has cam lobe lift of .500, the valve will lift about that which on our heads is okay (obvs check for coil bind)

Now a cam designed for a ratio rocker will have less lift on the cam as the lift is gained in the rockers.....

If that makes sense?

66brm
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Location: Perth, Western Australia, The Southern Hemisphere

Re: Run down on HIgh Ratio Rockers

Post by 66brm » Wed May 23, 2018 4:50 pm

Which in turn reduces the harshness of the ramps on the cam and side loads on lifters and their bores

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theKbStockpiler
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Re: Run down on HIgh Ratio Rockers

Post by theKbStockpiler » Wed May 23, 2018 8:53 pm

My thinking was that there would only be the need for mild cams because the High Ratio Rockers would take care of that but I did not think about the duration. :oops: The High Ratio cams must be a low lift / high duration grind.
Thanks for enlightening me! :D
Super beetle with attitude

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