revikan

My friend bought a b16 from hmotors, turbo'd it with a t3 turbo, and lost all compression. Tore the motor apart, found out it had CTR pistons and he cracked all of his ringlands. He wants to rebuild the motor with low compression pistons, but doesnt have the money for aftermarket. I've been researching and on zealautowerks compression calculator GSR pistons in a b16 would be 9.0:1 compression. So i got on ebay looking for gsr pistons and rings, and the seller claims the pistons will yeild an 8.5:1 compression ratio. What is the right ratio and/or do you have a better idea?

912

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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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Joseph Davis

I'm getting 9.0:1 to 9.1:1 for USDM GSR pistons. You'll be in the 9.6-9.7:1 area if they are JDM GSRs, make sure you get USDM as that lower CR is a good thing for reliability. Also, set your piston to wall and ring end gap a bit looser, and get your car tuned.

blinx9900

just use LS pistons and be done, thats what i did, make sure you open up the intake valve reliefs to make room for the larger vtec valves though, i made 333whp 91octane GT3076r.