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<div> <font size="2">This is well covered in many engine-building books & I've discussed it at length with several camshaft engineers over the years.</font></div>
<div><font size="2">It's my understanding that the lobe should have a very slight angle ground in, and the "flat" tappet really isn't, it's very slightly convex. <br>
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<div><font size="2">This will give it rotation, if it doesn't rotate it will wear.</font></div>
<div><font size="2">There could also be spring pressure or lubrication issues?</font></div>
<div><font size="2">In any case I would discuss it with the tappet supplier before doing anything, at the least make sure that they are sufficiently hard to begin with and can be reground.<br>
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<div><font size="2">Glen<br>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: Christian Marx via Fot <fot@autox.team.net><br>
To: fot@autox. team. net <fot@autox.team.net><br>
Sent: Mon, Jul 23, 2018 6:04 am<br>
Subject: [Fot] Do(o)med or flat lifters?<br>
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<div dir="auto">In the past we had this discussion.
<div dir="auto">I've bought some high quality lifters from USA, made from tool steel I suppose. 400$ they've cost..... and started to fail. On 3 of them, the very center does show e few pittings. Also visible that only a small part of the Cam is used.. The cam is okay</div>
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<div dir="auto">The machine shop will grind the lifters dead flat, as they should be, they say.</div>
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<div dir="auto">Cheers</div>
<div dir="auto">Chris</div>
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<div class="aolmail_gmail_quote">Am 18.07.2018 02:12 schrieb "fubog1 via Fot" <<a target="_blank" rel="noopener noreferrer" href="mailto:fot@autox.team.net">fot@autox.team.net</a>>:<br>
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<div> <font size="2">Yes, lacking access to a Cam Doc, you can use a set of V or bearing blocks, a degree wheel, dial indicator, and a bit of time, checked at 5 cam degrees, works fine.</font></div>
<div><font size="2">I'm still old school though, I plot them out on graph paper!<br>
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<div><font size="2">That will give you the lobe profile but most folks don't have the full specs on the cam, usually just advertised lift and duration.</font></div>
<div><font size="2">Since the tip of the lobe usually starts to go away first, a simple lift measurement will reveal the worst, best done with a dial indicator cuz some (cheap) cams are ground on different base circles.</font></div>
<div><font size="2">Generally, ramp wear is unusual if the tip is still OK, although there can be exceptions.</font></div>
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<div><font size="2">Glen.</font></div>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: timmmurphh <<a target="_blank" rel="noopener noreferrer" href="mailto:timmmurphh@gmail.com">timmmurphh@gmail.com</a>><br>
To: 'fubog1' <<a target="_blank" rel="noopener noreferrer" href="mailto:fubog1@aol.com">fubog1@aol.com</a>>; rbtr3a <<a target="_blank" rel="noopener noreferrer" href="mailto:rbtr3a@cox.net">rbtr3a@cox.net</a>><br>
Sent: Tue, Jul 17, 2018 12:38 pm<br>
Subject: RE: [Fot] Cams<br>
<br>
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<div class="aolmail_m_151265155674621544aolmail_MsoNormal">By degreeing the cam using increments of 10 crankshaft degrees (5 camshaft degrees) and then plotting the results in Excel, it is possible to get a very accurate picture of the profile of the cam.</div>
<div class="aolmail_m_151265155674621544aolmail_MsoNormal"> </div>
<div class="aolmail_m_151265155674621544aolmail_MsoNormal">I’ve attached a spreadsheet showing an intake and exhaust lobe comparison two years apart of our Kastner G3 cam for reference.</div>
<div class="aolmail_m_151265155674621544aolmail_MsoNormal"> </div>
<div class="aolmail_m_151265155674621544aolmail_MsoNormal">Tim Murphy</div>
<div class="aolmail_m_151265155674621544aolmail_MsoNormal">#317 TR4</div>
<div class="aolmail_m_151265155674621544aolmail_MsoNormal"> </div>
<div class="aolmail_m_151265155674621544aolmail_MsoNormal"><b>From:</b> Fot <fot-<a rel="noreferrer">bounces@autox.team.net</a>> <b>On Behalf Of </b>fubog1 via Fot<br>
<b>Sent:</b> Monday, July 16, 2018 6:31 AM<br>
<b>To:</b> <a rel="noreferrer">rbtr3a@cox.net</a>; <a rel="noreferrer">fot@autox.team.net</a><br>
<b>Subject:</b> Re: [Fot] Cams</div>
<div class="aolmail_m_151265155674621544aolmail_MsoNormal"> </div>
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<div class="aolmail_m_151265155674621544aolmail_MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Generally any obvious wear or pitting would make it unserviceable, but the wear isn't always so obvious.</span></div>
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<div class="aolmail_m_151265155674621544aolmail_MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">You can measure the lift and compare to spec, that will show any worn lobes, but the best way is to find someone who has a "cam doctor". It's a machine that sets it up and measures the complete profile.</span></div>
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<div class="aolmail_m_151265155674621544aolmail_MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Usually if there is anything apparent that suggests that there may be problems, there are...</span></div>
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<div class="aolmail_m_151265155674621544aolmail_MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Glen</span></div>
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<div class="aolmail_m_151265155674621544aolmail_MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">-----Original Message-----<br>
From: rbtr3a--- via Fot <<a rel="noopener noreferrer noreferrer">fot@autox.team.net</a>><br>
To: fot <<a rel="noopener noreferrer noreferrer">fot@autox.team.net</a>><br>
Sent: Sun, Jul 15, 2018 6:47 pm<br>
Subject: [Fot] Cams<br>
<br>
How do I determine if a cam is good or bad. If there are any marks on it does that make it bad. I do know that two of the lifters has pitting on the surface. <br>
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Ronnie<br>
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