Vance, I milled my head down to 3.400 inches but figured my compression ratio
to be more like 9.97 to 1. My combustion chambers, when I cc'd them using
rubbing alcohol ended up with the following volumes; 44.7, 44.9, 44.9, 45.1,
45.2, and 44.8. This meant the variations from highest to lowest is 0.5 cc
which is a little over 1% which seemed OK. The car seems to run fine on the
best Sunoco gas.
Darcy Hunter
'73 TR6
No Easton, MA
----- Original Message -----
From: Navarrette, Vance
To: Darcy Hunter
Sent: Friday, February 06, 2004 5:26 PM
Subject: RE: Head CC's
Darcy:
Mine came out at 45cc for a 9.5:1 compression ratio after I added the
head gasket volume (4cc according to David Vizard. I never actually measured
my head gasket). The chamber itself came out about 41-42cc. For a 9.5:1
compression ratio, the head thickness should be 3.410 or so. Since I bored my
engine out 0.020" over and decked the block 0.010", the final compression
ratio was actually closer to 9.6:1.
I measured mine with the spark plug inserted. I recommend that you add a
little dishwashing soap to the water when making the measurement to reduce
surface tension.
Vance
------------------------------
1974 Mimosa Yellow Triumph TR6
Cogito Ergo Zoom
(I think, therefore I go fast)
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From: Darcy Hunter [mailto:darcyhunter@comcast.net]
Sent: Thursday, February 05, 2004 5:26 PM
To: Navarrette, Vance
Subject: Head CC's
Vance, just catching up on emails and noticed you talked about cc'ing your
head. I milled mine down to 3.4" and measured combustion chamber volume to be
44cc up to about 46cc. And that was after making all the adjustments I could.
What was your experience.
Darcy hunter
'73 TR6
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