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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-family:"Comic Sans MS";color:#002060'>Jim, I had my engine rebuilt in 1999 with hardened valves seats and stellite exhaust valves. When installed, the engine ran just fine. I never bothered to check or adjust the valve clearances. In 2001, I ended up with a burned exhaust valve. Since then, I have checked/adjusted the clearances once a year and no further valve problems.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Comic Sans MS";color:#002060'>Is that an "old wives tale", or did I have a bad valve out of the box? <o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Comic Sans MS";color:#002060'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-family:"Comic Sans MS";color:#002060'>Steve Byers</span><span style='color:#002060'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Comic Sans MS";color:#002060'>HBJ8L/36666</span><span style='color:#002060'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Comic Sans MS";color:#002060'>BJ8 Registry</span><span style='color:#002060'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Comic Sans MS";color:#002060'>AHCA Delegate at Large</span><span style='color:#002060'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Comic Sans MS";color:#002060'>Havelock, NC </span><span style='color:#002060'><o:p></o:p></span></p><p class=MsoNormal><span style='color:#002060'><o:p> </o:p></span></p></div><p class=MsoNormal><span style='font-family:"Comic Sans MS";color:#002060'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Healeys [mailto:healeys-bounces@autox.team.net] <b>On Behalf Of </b>rjhco@att.net<br><b>Sent:</b> Tuesday, February 12, 2019 10:30 AM<br><b>To:</b> michaelsalter@gmail.com; 'WILLIAM B LAWRENCE'<br><b>Cc:</b> healeys@autox.team.net<br><b>Subject:</b> Re: [Healeys] Valve clearances<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Mike,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>You are correct that the valve train components change very, very little. Expansion of components causing valves to not close is an old wives tale that gets repeated many times until shade tree mechanics turn it into gospel…… Burned valves are caused by other design, assembly or materials factors.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Best regards,<o:p></o:p></p><p class=MsoNormal>Jim<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b>From:</b> Healeys <healeys-bounces@autox.team.net> <b>On Behalf Of </b>Michael Salter<br><b>Sent:</b> Sunday, January 13, 2019 5:23 PM<br><b>To:</b> WILLIAM B LAWRENCE <ynotink@msn.com><br><b>Cc:</b> healeys@autox.team.net<br><b>Subject:</b> Re: [Healeys] Valve clearances<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>This is another subject that I often wonder about. <o:p></o:p></p><div><p class=MsoNormal>If the valve clearance is there to ensure that the valves are fully closed when the engine is hot then why, when I check the clearances on a hot engine after a dyno run, are they hardly any less than they were cold?<o:p></o:p></p></div><div><p class=MsoNormal>I can appreciate that the valve train components grow because of the heat but surely the block and head and rocker shaft pedistals also grow and thus there is little if any net change.<o:p></o:p></p></div><div><p class=MsoNormal>I also appreciate that the exhaust valve stem get really hot but ????<o:p></o:p></p></div><div><p class=MsoNormal>Just wondering....<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>M<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Sun, Jan 13, 2019, 6:42 AM WILLIAM B LAWRENCE <<a href="mailto:ynotink@msn.com">ynotink@msn.com</a> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'><div><div><p class=MsoNormal><span style='font-size:12.0pt;color:black'>I disagree that valve clearances are not critical. As the engine comes up to temperature the metal parts of the valve train (valves, lifters, push rods, the head itself and the rocker shaft towers) increase in length and the valve clearances are calculated to assure that this expansion isn't allowed to affect the sealing of the valves on their seats. If the valves are set too tight they reach a point where they won't touch the seats and therefore won't seal. Hot gases rushing through the gaps will quickly erode the valves. Also i<span style='background:white'>ncreasing the duration and/or lift of the cam has the effect of the decreasing the length of the opening and closing ramps on the back side of the cam This reduces the length of time (dwell) the valve remains on the seat. Increasing the valve clearance restores the dwell time the valve needs to transfer its heat load to the cooling system through the valve seat and the cylinder head. Too little dwell time or the lack of proper valve sealing are two causes of burned valves.</span><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;color:black'>In my own experience I installed an Isky cam with a grind a little more aggressive than the 100M cam and set the clearances to 0.012" per the manual. Within about 2,000 miles the exhaust valves were trashed. I then took the time to read the Isky installation instructions which specifically state the valve clearance needs to be set to 0.018". I re-installed the head with new valves and set them to Isky's spec and never had another problem with burned valves.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;color:black'>Follow the cam grinder's recommendations and you will avoid trouble.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;color:black'>Bill Lawrence<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;color:black'>BN1 #554<o:p></o:p></span></p></div><div class=MsoNormal align=center style='text-align:center'><hr size=3 width="98%" align=center></div><div id="m_1603937236670712738divRplyFwdMsg"><p class=MsoNormal><b><span style='color:black'>From:</span></b><span style='color:black'> Healeys <<a href="mailto:healeys-bounces@autox.team.net" target="_blank">healeys-bounces@autox.team.net</a>> on behalf of Bob Spidell <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>><br><b>Sent:</b> Saturday, January 12, 2019 11:10 PM<br><b>To:</b> Michael MacLean; <a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a><br><b>Subject:</b> Re: [Healeys] Valve clearances</span> <o:p></o:p></p><div><p class=MsoNormal> <o:p></o:p></p></div></div><div><p style='background:white'>I should note the rockers are pretty noisy at 0.015; IIRC I tightened them up just a bit.<o:p></o:p></p><div><p class=MsoNormal style='background:white'>On 1/12/2019 2:39 PM, Michael MacLean wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p class=MsoNormal style='background:white'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>I'd go with .016. You can always tighten it. Better loose than tight.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Mike MacLean<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p></div></div><div id="m_1603937236670712738x_yahoo_quoted_8268064185"><div><div><p class=MsoNormal style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'>On Saturday, January 12, 2019, 11:01:32 AM PST, Bob Spidell <a href="mailto:bspidell@comcast.net" target="_blank"><bspidell@comcast.net></a> wrote: <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p> </o:p></span></p></div><div><div id="m_1603937236670712738x_yiv1110160614"><div><p style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'>Makes sense (for some reason). I put a DWR1 cam in my BJ8 which, according to DWR, 'is a little better than the BJ8 cam and so works well in any standard or mildly tuned car' but I think the 0.015" applies to all profiles on the spec sheet.<o:p></o:p></span></p><p style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'>Bob<o:p></o:p></span></p><div id="m_1603937236670712738x_yiv1110160614yqt70378"><div><p class=MsoNormal style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'>On 1/11/2019 8:48 PM, John Rowe wrote:<o:p></o:p></span></p></div></div></div><div id="m_1603937236670712738x_yiv1110160614yqt92654"><div><div><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#1F497D'>Simon,</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#1F497D'>Modified cams require the large clearance (don’t ask me why?) So go for .015 that is what mine is.</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#1F497D'>John Rowe</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#1F497D'>Qld</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#1F497D'>Australia</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#1F497D'> </span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><b><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'>From:</span></b><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'> Healeys [<a href="mailto:healeys-bounces@autox.team.net" target="_blank">mailto:healeys-bounces@autox.team.net</a>] <b>On Behalf Of </b><a href="mailto:simon.lachlan@alexarevel.plus.com" target="_blank">simon.lachlan@alexarevel.plus.com</a><br><b>Sent:</b> Saturday, 12 January 2019 9:14 AM<br><b>To:</b> Healeys<br><b>Subject:</b> [Healeys] Valve clearances<o:p></o:p></span></p></div></div><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'> <o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span lang=EN-GB style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'>The car is a MkII BT7.</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span lang=EN-GB style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'>The BMC manual says adjust the clearances, cold, to 0.012”.</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span lang=EN-GB style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'>Denis Welch said I should go 0.015”, cold, after fitting their “Fast Road” cam.</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span lang=EN-GB style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'>The rolling road guy said 0.016”, warm.</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span lang=EN-GB style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'> </span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span lang=EN-GB style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'>I have the radiator out right now so I can get a nice socket onto that nut and have a go at the clearances.</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span lang=EN-GB style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'>Stick with 0.015”, cold?</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span lang=EN-GB style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'> </span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span lang=EN-GB style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'>Thanks,</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p><p class=m1603937236670712738xyiv1110160614msonormal style='background:white'><span lang=EN-GB style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'>Simon</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p></o:p></span></p></div><p class=MsoNormal style='background:white'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A'><o:p> </o:p></span></p></div></div></div></div></div></div><div id="m_1603937236670712738x_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><table class=MsoNormalTable border=1 cellspacing=3 cellpadding=0 style='border:none;border-top:solid #D3D4DE 1.0pt'><tr><td width=55 style='width:41.25pt;border:none;padding:9.75pt .75pt .75pt .75pt'></td><td width=470 style='width:352.5pt;border:none;padding:9.0pt .75pt .75pt .75pt'></td></tr></table></div></blockquote></div></div><p class=MsoNormal style='margin-bottom:12.0pt'>_______________________________________________<br>Support Team.Net <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br>Suggested annual donation $12.75<br><br>Archive: <a href="http://www.team.net/pipermail/healeys" target="_blank">http://www.team.net/pipermail/healeys</a> <a href="http://autox.team.net/archive" target="_blank">http://autox.team.net/archive</a><br><br><a href="mailto:Healeys@autox.team.net" target="_blank">Healeys@autox.team.net</a><br><a href="http://autox.team.net/mailman/listinfo/healeys" target="_blank">http://autox.team.net/mailman/listinfo/healeys</a><br><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/healeys/michaelsalter@gmail.com" 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