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Thanks but it was the best word that came to mind at the time. I think =
you understand what I was after. So, several degrees either side =
won=E2=80=99t matter is what you=E2=80=99re saying. I was fairly certain =
that was true, however, aren=E2=80=99t the lobes of intake on 1 and out =
on 8 slightly shifted on the cam?=20
=20
TIA,
=20
Clayton
=20
From: Richard Ewald [mailto:richard.ewald@gmail.com]=20
Sent: Monday, May 18, 2015 8:37 PM
To: crk@godblessthe.us
Cc: <mgacars@yahoogroups.com>; <mgs@autox.team.net>
Subject: Re: [Mgs] tappet question
=20
Houston we have a problem with terminology here.=20
TDC and BDC refer to the position of the piston in the bore, or in the =
firing stroke. Period.=20
Piston at the exact top of its stroke? The piston is at TDC. At the =
exact bottom of its stroke? BDC.=20
#1 at the top of its stroke on compression? The engine is at TDC.=20
What you are referring to is the valve being on the lobe or the heel of =
the cam.=20
If you doubt that when #s valves 1 & 3 are on the top of the lobe that =
valves 6 & 8 are fully on the heel feel free to rotate the engine =
several degrees one way or the other and see if the gap gets bigger (it =
won't)=20
This is because a camshaft is a circle (base circle) with a bump on one =
side. Anywhere on the heel is going to give you the same clearance.=20
There are even some engines that instruct you to put the engine @ TDC #1 =
adjust half the valves then rotate the engine 360 degrees and then =
adjust the other half.=20
Rick
Sent from my iPhone
On May 18, 2015, at 10:03, Clayton Kirkwood via Mgs <mgs@autox.team.net =
Regarding Rule of Nine, I understand having 8 all the way up to set 1. =
But there is a significant rotation between =E2=80=9Creal close to the =
top=E2=80=9D in front of, and after TDC. This can be seen with rotation =
the engine and seeing very little to no movement. Also, if I am not =
mistaken 8 TDC is not perfectly in line with BDC of 1; there is a bias. =
This means that when 8 is TDC, 1 is not absolutely BDC ready for =
measurement. So the question is, how do you ensure, with all of that =
slop, that you truly have BDC?
=20
TIA,
=20
Clayton
=20
=20
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link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Thanks but it was the =
best word that came to mind at the time. I think you understand what I =
was after. So, several degrees either side won=E2=80=99t matter is what =
you=E2=80=99re saying. I was fairly certain that was true, however, =
aren=E2=80=99t the lobes of intake on 1 and out on 8 slightly shifted on =
the cam? <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>TIA,<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>Clayton<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p> </o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> Richard Ewald =
[mailto:richard.ewald@gmail.com] <br><b>Sent:</b> Monday, May 18, 2015 =
8:37 PM<br><b>To:</b> crk@godblessthe.us<br><b>Cc:</b> =
<mgacars@yahoogroups.com>; =
<mgs@autox.team.net><br><b>Subject:</b> Re: [Mgs] tappet =
question<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><p class=3DMsoNormal>Houston =
we have a problem with terminology here. <span =
style=3D'font-size:12.0pt'><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal>TDC and BDC refer to the position of the piston in the =
bore, or in the firing stroke. Period. <o:p></o:p></p></div><div><p =
class=3DMsoNormal>Piston at the exact top of its stroke? The =
piston is at TDC. At the exact bottom of its stroke? =
BDC. <o:p></o:p></p></div><div><p class=3DMsoNormal>#1 at the top =
of its stroke on compression? The engine is at =
TDC. <o:p></o:p></p></div><div><p class=3DMsoNormal>What you are =
referring to is the valve being on the lobe or the heel of the =
cam. <o:p></o:p></p></div><div><p class=3DMsoNormal>If you doubt =
that when #s valves 1 & 3 are on the top of the lobe that valves 6 =
& 8 are fully on the heel feel free to rotate the engine several =
degrees one way or the other and see if the gap gets bigger (it =
won't) <o:p></o:p></p></div><div><p class=3DMsoNormal>This is =
because a camshaft is a circle (base circle) with a bump on one side. =
Anywhere on the heel is going to give you the same =
clearance. <o:p></o:p></p></div><div><p class=3DMsoNormal>There are =
even some engines that instruct you to put the engine @ TDC #1 adjust =
half the valves then rotate the engine 360 degrees and then adjust the =
other half. <o:p></o:p></p></div><div><p =
class=3DMsoNormal>Rick<o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br>Sent from my =
iPhone<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><br>On May 18, 2015, at 10:03, Clayton =
Kirkwood via Mgs <<a =
href=3D"mailto:mgs@autox.team.net";>mgs@autox.team.net</a>> =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Regarding Rule of Nine, =
I understand having 8 all the way up to set 1. But there is a =
significant rotation between =E2=80=9Creal close to the top=E2=80=9D in =
front of, and after TDC. This can be seen with rotation the engine and =
seeing very little to no movement. Also, if I am not mistaken 8 TDC is =
not perfectly in line with BDC of 1; there is a bias. This means that =
when 8 is TDC, 1 is not absolutely BDC ready for measurement. So the =
question is, how do you ensure, with all of that slop, that you truly =
have BDC?</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'> </span><o:p></o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>TIA,</span><o:p></o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'> </span><o:p></o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>Clayton</span><o:p></o:p></p><p =
class=3DMsoNormal><span =
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style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p =
class=3DMsoNormal><o:p> </o:p></p></div></div></blockquote></div></b=
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