Specs and Compression
calculators
D14A3/D14A4/D14Z1/D14Z2
This page is mentioned for people who want to
calculate the compression ratio of their engines when swapping out parts with
other D-series engines. Since most available (if not all) compression calculators
do not cover D14 engines, you’ll find the missing specs here. Also I present
some links to compression calculators. Use them at your own risk,
Errors may be present in the numbers on my website and on the websites of these
calculators. One of the most common errors is that gasket thickness is not
corrected for tensioning. Many thanks to hondaNickx
for his very accurate measurements.
D14 rods:
-rod length, centre to centre 138 mm
-big end bore: 43
mm
-piston pin: 19
mm
-piston to deck height 0 mm
P3Y pistons found in D14A3/A4 (D14Z1/Z2 is different,
piston is P3HG or alike):
-compression height: 29.5
mm
-dish shape: -5.4
cc
Block
-bore 75
mm
-stroke 79
mm
-deck height 207
mm
[-half stroke 39.5 mm ]
[-rod length 138 mm ]
[-compression height 29.5 mm ]
[-piston to deck height + 0
mm ]
[-total 207
mm ]
Combustion chamber D14A3/A4
-volume 34.6
cc
-stock compression ratio 9.1