Engine Blue Printing - 1275cc A-series - Cylinder head #1
LEGEND: ORANGE
= measurements, GREEN
= calculations, PINK
= Needs to be figured out someday, YELLOW
= notes, Bright Yellow
= To Do
DISCUSSION:
- Not much to say about the #1 cylinder head since
everything seems to be pristine. About the only
thing that is evenly slightly odd is the variation of
combustion chamber volume. It has a range of 2.0
cc or 0.12 in^3 in volume. This seems to be a
significant difference, but maybe not for an as-cast
cylinder head. Well, this really doesn't matter
too much since the combustion chamber needs to be
reshaped as specified by Vizard. However, I
think I must have made a mistake in measuring the
volumes since only one of them is really out in left
field, cylinder 2.
- Measurement of the combustion chamber volume was
made using a sheet of Plexiglas, medical syringe, Vaseline
and rubbing alcohol. The Plexiglas has a hole
drilled in it so that you can feed the alcohol into
with the syringe. All you have to do is smear
Vaseline onto the cylinder head around the combustion
chamber and press the Plexiglas onto it, sealing the
gap between the two surfaces. Then you careful
count the amount of alcohol that you place into the
combustion chamber. Ah, don't forget to put
spark plugs to seal the big gapping holes!
Alcohol is used because of it's lower surface tension
which creates a smaller meniscus. Also, it
evaporates so you don't have to worry about rusting
the head with leftover water.
- Additionally, the ports need to be reshaped
according to Vizard.
- Can't forget that the smog ports need to be plugged.
SUMMARY:
- Well, whomever touched the #1 block also had their
hands on the #1 cylinder head. Wow, what a
pristine head. It appears to be completely stock
except maybe one skimming cut having been taken.
And, to make things even better, this head is one of
the good cast iron cylinder heads according to Vizard.
- I have a few follow-up measurements to make on this
head to complete the BPing. And, then somewhere
along the line I have to pick compression ratio and
figure out the desired thickness.
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- The next three photos are basically
self-explanatory. Level the surface to be
measured and get measuring.
- I believe the photos on this page are all photos of
cylinder head #2, whereas the data above is for #1.
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- These are the valves from cylinder head #1.
Pretty clean, eh. They are the stock sized
valves.
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