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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 firin=
g stroke. Period.=20
Piston at the exact top of its stroke? The piston is at TDC. At the exact b=
ottom 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 c=
am.=20
If you doubt that when #s valves 1 & 3 are on the top of the lobe that valve=
s 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 adj=
ust half the valves then rotate the engine 360 degrees and then adjust the o=
ther half.=20
Rick
Sent from my iPhone
> On May 18, 2015, at 10:03, Clayton Kirkwood via Mgs <mgs@autox.team.net> w=
rote:
>=20
> 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 an=
d 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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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div>Houston we have a problem with termino=
logy here. </div><div>TDC and BDC refer to the position of the piston i=
n the bore, or in the firing stroke. Period. </div><div>Piston at the e=
xact top of its stroke? The piston is at TDC. At the exact bottom of i=
ts stroke? BDC. </div><div>#1 at the top of its stroke on compression? &=
nbsp;The engine is at TDC. </div><div>What you are referring to is the v=
alve being on the lobe or the heel of the cam. </div><div>If you doubt t=
hat 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 wa=
y or the other and see if the gap gets bigger (it won't) </div><div>Thi=
s is because a camshaft is a circle (base circle) with a bump on one side. A=
nywhere on the heel is going to give you the same clearance. </div><div=
>There are even some engines that instruct you to put the engine @ TDC #1 ad=
just half the valves then rotate the engine 360 degrees and then adjust the o=
ther half. </div><div>Rick</div><div><br><br>Sent from my iPhone</div><=
div><br>On May 18, 2015, at 10:03, Clayton Kirkwood via Mgs <<a href=3D"m=
ailto:mgs@autox.team.net">mgs@autox.team.net</a>> wrote:<br><br></div><bl=
ockquote type=3D"cite"><meta http-equiv=3D"Content-Type" content=3D"text/htm=
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</o:shapelayout></xml><![endif]--><div class=3D"WordSection1"><p class=3D"Ms=
oNormal"><span style=3D"color:#1F497D">Regarding Rule of Nine, I understand h=
aving 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 ca=
n be seen with rotation the engine and seeing very little to no movement. Al=
so, 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, t=
hat you truly have BDC?<o:p></o:p></span></p><p class=3D"MsoNormal"><span st=
yle=3D"color:#1F497D"><o:p> </o:p></span></p><p class=3D"MsoNormal"><sp=
an style=3D"color:#1F497D">TIA,<o:p></o:p></span></p><p class=3D"MsoNormal">=
<span style=3D"color:#1F497D"><o:p> </o:p></span></p><p class=3D"MsoNor=
mal"><span style=3D"color:#1F497D">Clayton<o:p></o:p></span></p><p class=3D"=
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0in"><p class=3D"MsoNormal"><br></p></div></div></div></blockquote></body><=
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