<div dir="ltr">My guess is the vented valve cover cap on the aluminum valve covers isn't vented very well. Triumph spec'd a 1/8' metered valve in their vented filler caps. <div><br></div><div>That's a great tip on how to check for excess pressure in the crankcase. I'll have to give it a try next time I have get the car out. </div><div><br></div><div>I think I've tried 3 different PCV valves and since I have the parts will try the gulp valve. Should be a interesting experiment!</div><div><br></div><div>Thanks for the info.</div><div><br></div><div>Brad</div><div><br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Sep 7, 2015 at 4:52 PM, John & Pat Donnelly <span dir="ltr"><<a href="mailto:pdonnel1@san.rr.com" target="_blank">pdonnel1@san.rr.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d">Well, I bought the vented cap when I bought the valve cover from TSI. It has a hole on the top, but who knows how much it's really venting. I have roller rockers installed so I need the extra room.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d">No, the draft hole is still plugged.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d">A mechanic once told me that is you take the valve cover cap off when running, then put a shop rag over it you should only see a little deflection. When I did it to my car it went up 3-4 inches. That was my big clue that I needed more venting.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d">All PVC valves are different and each handles different volumes. Some have springs that only actuate with a pressure differential. I don’t know about the GP PVC valve but you might look around for another. They're cheap.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><div style="border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt"><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""> Triumphs [mailto:<a href="mailto:triumphs-bounces@autox.team.net" target="_blank">triumphs-bounces@autox.team.net</a>] <b>On Behalf Of </b>Geo Hahn<br><b>Sent:</b> Monday, September 07, 2015 11:53 AM<br><b>To:</b> Brad Kahler<br><b>Cc:</b> Triumphs<br><b>Subject:</b> Re: [TR] TR4 road draft tube plug<u></u><u></u></span></p></div></div><p class="MsoNormal"><u></u> <u></u></p><div><div><div><p class="MsoNormal">On Mon, Sep 7, 2015 at 10:08 AM, Brad Kahler <<a href="mailto:bkahler1@gmail.com" target="_blank">bkahler1@gmail.com</a>> wrote:<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"><div><div><p class="MsoNormal">...Also, is your valve cover cap vented (i.e. TR4A style) or non-vented?<u></u><u></u></p></div></div></blockquote><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Those terms (or something) confuse me.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">My late TR4 does not have a vented cap - it seals tight. I presume that TR4As are similar. Early TR4s and all TR3s had a cap that vents to the atmosphere.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">If you are fighting blow-by (and I think you are) it would seem that a vented cap might help -- and since your engine apparently has a road draft tube fitted as original then I believe a vented cap would have also been on it.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Geo<u></u><u></u></p></div></div></div></div></div>
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