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As said elsewhere TDC and BDC are not relevant, if you are referring to =
the piston. If you look at the valve timing the inlet lobe is at its =
peak 70-odd degrees before BDC, and the exhaust valve is at it's peak =
about the same distance after BDC. So the back of the lobes are under =
the followers 180 degrees from there, which is more than 70 degrees =
before TDC and after TDC respectively.
But it shouldn't make a difference, look at the cam profile, and the =
base circle should extend for significantly more than half way round the =
cam, in theory giving more than 180 of engine rotation where the =
clearance should be the same.
Note in theory, which is why I said it's one of the reasons why I find =
the position of greatest gap to adjust them, which on mine (and others I =
have done) can be several degrees either side of the strict RON point. =20
Also, whilst the dynamic forces on the piston etc. are slightly =
different on compression and expansion etc, statically TDC is directly =
above BDC, how could it be anything else?
PaulH.
----- Original Message -----=20
Regarding Rule of Nine, I understand having 8 all the way up to set 1. =
But there is a significant rotation between "real close to the top" 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?
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<DIV><FONT size=3D2>As said elsewhere TDC and BDC are not relevant, if =
you are=20
referring to the piston. If you look at the valve timing the inlet =
lobe is=20
at its peak 70-odd degrees before BDC, and the exhaust valve is at it's =
peak=20
about the same distance after BDC. So the back of the lobes are =
under the=20
followers 180 degrees from there, which is more than 70 degrees before =
TDC and=20
after TDC respectively.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>But it shouldn't make a difference, look at the cam =
profile,=20
and the base circle should extend for significantly more than half way =
round the=20
cam, in theory giving more than 180 of engine rotation where the =
clearance=20
should be the same.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV>
<DIV><FONT size=3D2>Note in theory, which is why I said it's one of the =
reasons=20
why I find the position of greatest gap to adjust them, which on mine =
(and=20
others I have done) can be several degrees either side of the =
strict RON=20
point. </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Also, whilst the dynamic forces on the piston etc. =
are=20
slightly different on compression and expansion etc, statically TDC =
is=20
directly above BDC, how could it be anything else?</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>PaulH.</FONT></DIV></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> </FONT>----- Original Message ----- </DIV>
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<DIV class=3DWordSection1>
<P class=3DMsoNormal><SPAN style=3D"COLOR: #1f497d">Regarding Rule of =
Nine, I=20
understand having 8 all the way up to set 1. But there is a =
significant=20
rotation between =93real close to the top=94 in front of, and after =
TDC. This can=20
be seen with rotation the engine and seeing very little to no =
movement. Also,=20
if I am not mistaken 8 TDC is not perfectly in line with BDC of 1; =
there is a=20
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,=20
that you truly have =
BDC?<o:p></o:p></SPAN></P></DIV></BLOCKQUOTE></BODY></HTML>
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