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Honda/Acura B and D series Compression Calculator

This calculator is intended for use as a general estimate of your compression only. Certain variables that cannot be accounted for may cause the actual compression ratio to vary - such as a head that has been milled. Please use your own descretion.

Default values have been provided for your convenience. You can enter your own custom values in the edit boxes below to match your personal setup as needed.

Block
B16A/B
B17A
B18A/B
B18C1/C5
B20B/Z
Other
D15B7
D16A6 - D16Z6
D16Y7 - D16Y8
 Bore (mm)
Stroke (mm)
Head
B16A/B - B18C5
B17A
B18A/B - B20B/Z
B18C1
Other 		D15B7 - D16A6
D16Z6
D16Y8 - D16Y7
ZC
 Combustion Chamber Volume
(cc per cylinder)
Piston
pr3 (USDM B16A)
p30 (JDM B16A)
p61 (B17A)
pr4 (B18A/B)
p72-A0 (USDM B18C1)
p72-00 (JDM B18C1)
p73-A0 (USDM B18C5)
p73-00 (JDM B18C5)
p3f (B20B)
phk (B20Z)
pct (JDM B16B)
Other
pm6 (USDM D16A6)
p28-A01 (USDM D16Z6)
p2p (USDM D16Y8)
pm7 (JDM ZC)
p29 (USDM D16A1)
 Piston Dome Displacement
(cc per piston)
Headgasket Thickness
OEM B-series 3-layer
B-series 2-layer
B-series 1-layer
Other
 OEM D15B7 - D16A6
OEM D16Y8 - D16Z6
2-layer D16Y8
 Thickness (in)
* Bore difference (mm)
[Gasket Bore - Cylinder Bore]
Piston-to-Deck Height
OEM B16A/B
OEM B18A/B/C1/C5 - B20B/Z
Other
 OEM D15B7 - D16A6
OEM D16Y8
OEM D16Z6 - D16Y7
OEM ZC
 Height (in)
[negative value = out of the hole]


COMPRESSION RATIO
: 1cr

Displacement
cc
* It is not necessary to do so, however for slightly better results, enter the difference between the bore diameter of the headgasket in use and the actual cylinder bore to increase accuracy of the calculations. (ie. Actual cylinder bore may be 81.50mm whereas the headgasket bore is 82.00mm, therefore there is a difference of 0.50mm - enter this value into the edit box) Otherwise leave it at the default value 0.00

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