[Healeys] Forged pistons

[Roger Grace <roggrace@telus.net>]

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Late model BJ8

In the process of changing out the block (because of a porosity coolant
leak into the oil drain back).

Managed to find a Wolseley 110 saloon block of similar vintage. I do
believe that it was original and had not been previously opened. Everything
seemed the same and interchangeable with my original bock. Well almost ...

While the engine is in bits decided to do some upgrades - pots re bore,
crank grind, balancing, new pistons etc. etc. Now discover that the pots
are about 25 thou shorter than the original. Any thought as to reason ? I
note that the Wolseley block had concave piston crowns. Maybe to reduce
compression for a saloon car and the block decked to set the final
compression ?

To add to this problem decided to spring for a set of AH Spares forged
pistons. Surprise surprise the compression length is about 18 thou longer
than standard BJ8 pistons. These variances might seem trivial but they are
consequential. So now will likely have to machine the forged piston crowns
or as a last resort consider a block shim. All rather painful !

Any thoughts or ideas appreciated.

rg


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<p style=3D"margin-bottom:0cm">Late model BJ8</p>
<p style=3D"margin-bottom:0cm">In the process of changing out the
block (because of a porosity coolant leak into the oil drain back).</p>
<p style=3D"margin-bottom:0cm">Managed to find a Wolseley 110 saloon
block of similar vintage. I do believe that it was original and had not bee=
n previously opened. Everything seemed the same and interchangeable
with my original bock. Well almost ...</p><p style=3D"margin-bottom:0cm">Wh=
ile the engine is in bits decided to do
some upgrades -  pots re bore, crank grind, balancing, new pistons
etc. etc. Now discover that the pots are about 25 thou shorter than
the original. Any thought as to reason ? I note that the Wolseley
block had concave piston crowns. Maybe to reduce compression for a
saloon car and the block decked to set the final compression ?</p>
<p style=3D"margin-bottom:0cm">To add to this problem decided to
spring for a set of AH Spares forged pistons. Surprise surprise the
compression length is about 18 thou longer than standard BJ8 pistons.
These variances might seem trivial but they are consequential.  So
now will likely have to machine the forged piston crowns or as a last
resort consider a block shim.  All rather painful !</p>
<p style=3D"margin-bottom:0cm">Any thoughts or ideas appreciated.</p><p sty=
le=3D"margin-bottom:0cm">rg</p>

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