<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> </head> <body><div class="auto-created-dir-div" dir="auto" style="unicode-bidi: embed;">Hi Mike,<div><p>Short answer - no. Don't read further unless you have time to spare.</p><div><p>Time to ask you a question - what is the purpose of 'honing'? Save you thinking (lol), it is to improve the regularity of the surface both in its geometric shape and its surface finish. (I always thought it was to make it rounder and smoother but - what do I know.) So it improves a moving contact between a couple of lumps of metal. ie piston rings to bore or, rocker shaft to rockers. It <span style="display: inline !important;">reduces friction and enables a larger surface to surface contact area.</span></p>Honing reduces friction to a minimal amount - so ask, does your rocker shaft rotate in the pillars or do they hold it nice and rigid preventing unwanted fluctuating movements in a precisely calculated rocker arm movement and position? The pillars hold it still. So, as a general, background thought - if they are moving, hone it and if they don't move against each other don't bother. Now this is not a rule, various surfaces (ie head to block or manifold flanges to block) do need a tad of honing to make them seat properly and some extreme honing comes under the guise of 'polishing' but that doesn't generally improve the geometric qualities - but it can. It is just a rather loose basic principle.</div><div><p><br></p><p>Have a Merry Christmas and a Happy New Year</p><p><br></p><p><br></p><blockquote style="margin: 0 auto;padding: 0 2.0em;border-left: 2.0px solid rgb(0,173,229);"><br><br>------ Original Message ------<br>From: "Michael MacLean via Spridgets" <<span class="wt_Email">spridgets@autox.team.net</span><span></span>><br>To: "Spridgets" <<span class="wt_Email">spridgets@autox.team.net</span><span></span>><br>Sent: Wednesday, 20 Dec, 23 At 14:25<br>Subject: [Spridgets] Forged rockers and Hardened Shaft<br><br><div dir="ltr"><div> I acquired a set of forged rockers and a hardened rocker shaft from David Anton to "build" a new rocker arm assembly. This is for the new engine I am building to replace the rod knocking 1275 in my Bugeye. For what it costs, I am committed to put this assembly together. The one caveat that David told me when he sold me the set of shaft and rockers was that the rocker bushes had to be honed to fit the shaft. The hardening process had increased the diameter of the shaft by a couple of thousands. Not a problem. I found a local shop that can do it. The rockers should have a clearance of 1 -2 thou for proper lubrication. The one thing I did not take into account was the pillars. Should they be honed also? I can find no indication anywhere of the clearance dimension for the shaft to pillar fit. Knowing that a tight fit will produce failure and too loose of a fit will drop oil pressure. A question for you engine builders out there.</div><div>Mike MacLean <br></div></div> <hr>------------------------<br> <br> <span class="wt_Email"><span class="wt_Email">spridgets@autox.team.net</span><span></span></span><span></span><br> <br> Donate: <a target="_blank" href="http://www.team.net/donate.html">http://www.team.net/donate.html</a><br> Suggested annual donation: $12.75<br> <br> Archive: <a target="_blank" href="http://www.team.net/pipermail/spridgets">http://www.team.net/pipermail/spridgets</a> <a target="_blank" href="http://autox.team.net/archive">http://autox.team.net/archive</a><br> <br> Unsubscribe/Manage: <a target="_blank" href="http://autox.team.net/mailman/options/spridgets/grday@btinternet.com">http://autox.team.net/mailman/options/spridgets/grday@btinternet.com</a><br> </blockquote></div></div></div> </body></html>