Pulling Forum - Roller rockers question

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Roller rockers question

Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=74961
Printed Date: 23 Nov 2024 at 5:42am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Roller rockers question

Posted By: brbrooks83
Subject: Roller rockers question
Date 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?

Replies:

Posted By: Dnoym N. S. Can.
Date Posted: 11 Aug 2013 at 12:16pm

it be a waste of 400 bucks

B:-) Dnoym

Posted By: DrAllis
Date 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.

Posted By: jpankey
Date 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.