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Roller rockers question
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brbrooks83 View Drop Down
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Joined: 17 Sep 2011
Location: Strawberry Plai
Points: 144 		Post Options Post Options   Thanks (0) Thanks(0)   Quote brbrooks83 Quote  Post ReplyReply Direct Link To This Post Topic: Roller rockers question
    Posted: 11 Aug 2013 at 10:26am
I bought a Allis wd setup for pulling the owner said it had some head work but haven't had it apart. The tractor is strong and we did good with it the first time out wondering if roller rockers would make a big difference or would it be a waste of 400 bucks? Is anybody running them?
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Dnoym N. S. Can. View Drop Down
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Joined: 03 Oct 2009
Points: 544 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dnoym N. S. Can. Quote  Post ReplyReply Direct Link To This Post Posted: 11 Aug 2013 at 12:16pm
 it be a waste of 400 bucks
B:-)      Dnoym
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20528 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 11 Aug 2013 at 7:48pm
If they are the same rocker-ratio and you're only running 2000 rpm, I wouldn't spend my money on them.  If they provide more valve lift because of a different ratio, then that might exclude regrinding the camshaft.
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jpankey View Drop Down
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Points: 64 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jpankey Quote  Post ReplyReply Direct Link To This Post Posted: 16 Aug 2013 at 4:53pm

Billy Godbold of compcams says that every 1/2 point rocker ratio change makes the cam act like it has 2 degrees more tappet duration at .050. Every full point is like 3 degrees .If you keep the same rocker lash and dont increase it when increasing rocker ratio. So 1.5 to 1.85 be  3x3=9 +2= about  11 degrees in tappet duration change plus the additional lift which a engine is at 33 percent of the time couldnt do anything but help in performance not to  mention the additional air under the curve at all valve lift measurements. Murphy has a chart that you can click on to aid in visual interpetation if needed.

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