Subject: Re: Cylinder heads
Author: Patrick Hayes
Date: Feb 28, 2002, 4:59 PM
Post ID: 1709749398
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In a message dated 2/28/02 4:41:16 PM Pacific Standard Time, kg8-@home.com
writes:
| IF you put them back on,LEAVE THEM OFF OF THE EXHAUST SIDE. Especially with the no lead gas a little oil on the Ex guide helps more than harms. |
Good advice. The source of oil is the rocker chamber. The real culprit is a
worn INTAKE guide. As the piston sucks down and a volume of air rushes
through the intake air port past the valve stem, it sucks oil down between
the stem and guide and pollutes the combustion mixture (=pinging).
Now, if you have an exposed valve single like my '46 SuperAlce, you have to
have some oil for lubrication (since there isn't any on top). The cast iron
head includes a neat little passage to feed oil down through the intake
guide. Not all is consumed by fire and some residual lubricates the exhaust
stem on the way out. A dead loss system.
Patrick
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<FONT FACE=arial,helvetica><FONT SIZE=2>In a message dated 2/28/02 4:41:16 PM Pacific Standard Time, kg8-@home.com writes:<BR>
<BR>
<BR>
<BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">IF you put them back on,LEAVE THEM <BR>
OFF OF THE EXHAUST SIDE. Especially with the no lead gas a little oil on <BR>
the Ex guide helps more than harms.<BR>
</BLOCKQUOTE><BR>
<BR>
Good advice. The source of oil is the rocker chamber. The real culprit is a worn INTAKE guide. As the piston sucks down and a volume of air rushes through the intake air port past the valve stem, it sucks oil down between the stem and guide and pollutes the combustion mixture (=pinging).<BR>
<BR>
Now, if you have an exposed valve single like my '46 SuperAlce, you have to have some oil for lubrication (since there isn't any on top). The cast iron head includes a neat little passage to feed oil down through the intake guide. Not all is consumed by fire and some residual lubricates the exhaust stem on the way out. A dead loss system.<BR>
<BR>
Patrick</FONT>
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