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Re: Stamped steel BB rocker arm ratio?
[Re: 6PakBee]
#107561
08/21/08 11:12 AM
08/21/08 11:12 AM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
Quote:
Quote:
the stamped steels i've measured using a solid tappet, adjustable push rod, and checking valve spring were 1.5. all 1.5 adjustables i've measured, using the above mentioned method, were 1.6. all 1.6's i've measured were 1.65-1.66. going from a true 1.5 ratio to a true 1.6 will add about 5-7 degrees duration at .200 lobe lift, nearly nothing at .050 lobe lift; on the average flat tappet cam. and thats my story and i'm sticking to it.
You want to see a surprising change in your measurement. Get rid of the solid lifter, Take hyd. lifter and shim the plunger to the pre load that you will be using then measure the liftratio. You will be surprised and the difference due to depth of the push rod in the lifter and angle change. You will find that unless using solid lifter on a solid cam with the rocker adjusted to spec. you will be very inaccurtate on a hydraulic cam using the solid lifter. 
Depends what you want. If you are trying to get an absolute lift number at the valve you are absolutely correct. If you just want to compare a batch of rockers against each other, it doesn't really matter.
And I am/was under the impression that it is max lift that is in question being the comparison of 1.5 - 1.6 rockers was used in the original post. Yes, if getting a uniform set of rockers was the issue it wouldn't be a big deal as to which lifters to use. But the lift change do to angle because of push rod depth in the lifter is significant. 
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