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@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
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