[Healeys] 100-4 Piston Depth

[Warthodson at aol.com]

Don't panic, yet. In general, It is not uncommon for a piston top to be  
above the surface of a block at top dead center. If necessary, it is probably  
possible to machine the tops of the pistons to lower the compression. It is  
necessary to take the head gasket thickness into account when figuring the  
compression ratio. Sorry, but I can't address the 100 engine specifically.
Gary
 
 
In a message dated 2/21/2009 3:24:50 A.M. Central Standard Time,  
coudesluijs at chello.nl writes:

You  could use custom pistons but you may be able to get away fitting a 
thicker  head gasket, e.g. one made from red copper plate ca. 2mm thick, 
using your  old gasket as a template and making sure that the gasket will 
not faul the  pistons. Check that the all the channels/holes still line 
up between head  /gasket/block. Heat the copper plate to cherry red and 
immerse in water  first to make it softer.
Kees Oudesluijs


rrengineer  @dslextreme.com schreef:
> Can anyone tell me how close you can get the  top of your pistons to the top
> of the block?  The bare block I  got for nothing that I built my motor from
> does not have the head on  it yet.  I am having the head ported and
> polished.  During  this process, the polisher asked me to take some modeling
> clay and  fill one of the piston tops at TDC and skim the excess off the
>  top.  He said to wad up what would fit in this void and he would drop it  
in
> a measured beaker to see how many CCs it displaced to get an idea  of how
> much he could grind out of the combustion chamber in the  head.  When I went
> to fill this area with clay I discovered that  the piston sits approx. 
1/16th
> of an ich ABOVE the top of the  block.  This is something I did not notice
> before because none of  the pistons were at TDC before.  I'm guessing that
> this will be a  problem.  I have no idea how much was cut from the block
> before I  got it.  All I had done was a clean-up cut during machining.   
Could
> the cheap Moss pistons be too tall?  I'm thinking not, but  maybe I'm gonna
> need some custon pistons for this engine.
> Mike  MacLean
> 56 BN2
> 60 AN5
>  _______________________________________________
> Support Team.Net  http://www.team.net/donate.html
>
> Healeys at autox.team.net
>  http://autox.team.net/mailman/listinfo/healeys
>
> You are  subscribed as coudesluijs at chello.nl
>
>  http://www.team.net/archive
Healeys at autox.team.net
http://autox.team.net/mailman/listinfo/healeys

You  are subscribed as  warthodson at aol.com

http://www.team.net/archive


**************A Good Credit Score is 700 or Above. See yours in just 2 easy 
steps! 
(http://pr.atwola.com/promoclk/100126575x1218822736x1201267884/aol?redir=http:%2F%2Fwww.freecreditreport.com%2Fpm%2Fdefault.aspx%3Fsc%3D668072%26hmpgID
%3D62%26bcd%3DfebemailfooterNO62)