Re: a really BORING question

[Bill Watson <wwatson5@xxxxxxxxx>]

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Yes, for a 4.000" bore the piston is slightly less than the bore to make
space for the rings, which do press against the cylinder wall.   They need
to press against the wall to ensure you have compression.  Which is is why
it is extremely important the cylinder walls get oiled otherwise the rings
will score the cylinder walls and destroy themselves.  And why the ends of
the rings have a small space between them - to provide room for expansion /
contraction whille keeping the ring pressed against the cylinder wall.

When you bore the engine .030" the pistons are also increased in diameter by
.030".  That way the piston is still slightly less in diameter than the bore
to make space for the rings.  If, say, there is a .0025" gap between a
standard piston and the cylinder wall in a standard bore, the piston
diameter must be increased by the same amount as the bore or the
piston-to-cylinder wall gap will be incorrect.    In this scenario,  a
4.000" bore takes a piston that is really 3.9975" in diameter.   If you
increase the bore to 4.030", the piston must be increased .030" to 4.02975"
to maintain that .0025" gap.

The pistons have compressions rings and oil rings.  It is important the oil
rings be installed right way up, by the way.  They act as a dam to prevent
oil from getting into the combustion chamber.  On some oil rings if they are
installed upsidedown the oil will be pushed up into the cumbustion chamber.

Bill
Vancouver, BC

----- Original Message ----- 
From: "Robert neal zimmerman" <northwestweirdo@xxxxxxxxxxx>
To: <1962to1965mopars@xxxxxxxxxx>
Sent: Saturday, June 04, 2005 2:52 AM
Subject: Re: a really BORING question




i appreciate the responses but I think u guys are missing my point.
   Let me put it another way-
    There cant be zero tolerance in the cylinder, there has to be a
    clearance.
     The hole cant measure 4.030 AND the piston as well, nothing could
     move, there has to be a slip,
      Where is the slip???
       Either the piston has to be slightly LESS than the 4.030 of the
       hole
       OR
       the hole must be slightly MORE than  the 4.030 of the piston.
        Is that more clear?
         Neal Zimmerman, Eugene oregon

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