4 cylinder head question

["John Fielding" <johnf@xxxxxxxxxxxxxxx>]

Hi All,

I would answer this question myself if I had a head handy, but!

The head in question is either a 2L or 1750 engine.

Can someone who has a head off the engine measure the combustion chamber depth and
diametre?  The measurement can be either in mm or inches, I can convert into the form I
require.

I am having an offline correspondence with another digestee and trying to
figure out the ratio of metal removed to CR increase.  It seems the Alfa hemispherical
head is anything but.  The combustion chamber bowl depth is much less than a true
hemisphere and hence the CR increase for a particular amount of metal removed is highly
non-linear.  From data I have from official Alfa documents the combustion chamber volume
is 61,3cc for the 1750 and 2L engines, but the actual volume is closer to 50cc, which
means the chamber is a truncated hemisphere.  How much it is truncated is hard to tell
without an accurate measurement of the depth and diametre.

TIA

John
Durban
South Africa
Alfetta 1.8L turbo - resting at present :(
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