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Old 03-12-2008, 05:27 PM
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advantages of 1.6 rockers ?

In the process of building a engine , will the use of 1.6 or 1.7 rockers allow for a smaller cam and result in more clearance between the rods and the cam Than say a 1.5 ratio ? and if so is it a significant amount ? All I have bought so far is the parts to assemble the short block . I have established the cam specs but have not bought one yet so its not to late to change it .
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Old 03-12-2008, 05:41 PM
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.320 lobe lift 1.5 rocker .480 gross lift
1.6 rocker .512
1.7 rocker .544

PRETTY BIG DEFFERENCE HUH??
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Old 03-12-2008, 07:09 PM
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Quote:
Originally Posted by smokin63
In the process of building a engine , will the use of 1.6 or 1.7 rockers allow for a smaller cam and result in more clearance between the rods and the cam Than say a 1.5 ratio ? and if so is it a significant amount ? All I have bought so far is the parts to assemble the short block . I have established the cam specs but have not bought one yet so its not to late to change it .
Thanks
the simple short answer is ....NO

If you want to use a non standard "small base circle" camshaft to get more cam lobe/connecting rod clearance, then you use a longer push rod to compensate.
With a "small base circle" camshaft the lifter sits lower in the lifter bore when the lifter is down on the heel of the camshaft lobe.
The camshaft lobe lift and duration (valve timing) is not the same as the camshaft base circle diameter. Most any camshaft valve timing and lift grind can be done on a non standard "small base circle cam" There are some limitations with some aggressive roller cam lobe shapes.

Rocker arm ratio is a separate unrelated issue.
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Old 03-12-2008, 07:15 PM
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1.6 and 1.7 arms are mostly for a "quickly" tune job.

You can take a stock cam, swap the rockers and POW its like a higher lift cam.

IMO this puts more strain on the cam, because it amplifies the spring pressure.

also IMO let the cam do the work!
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