ok 1st off i did use the comp. calc. but it wasnt too much help.....heres the problem: i have a dohc zc and <U>allmost</U> nobody makes pistons for the zc, so i plan on using srp's. now i need to stay standard bore and my comp. range is 8.8-9.5:1 ....the pistons all say 9:1 or 9.5:1 but those pistons are for the a6 or z6 engines...so could someone please tell me how to figure out the compression for these pistons in a dohc zc??

 

Just look for pistons made for the 88-89 Integra...same thing as the ZC.

As far as figuring compression with the calculator...just select everything ZC except the actual piston. It will give you the compression ratio if you use an oem spec piston.
If none of those work, start looking aftermarket.

 

with SRP part no. 149196 pistons for D16A6 - stock undecked DOHC ZC block, stock unmilled ZC head, OEM 88-89 Integra head gasket, your compression ratio would be 9.44:1

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlicrx &raquo;</TD></TR><TR><TD CLASS="quote">with SRP part no. 149196 pistons for D16A6 - stock undecked DOHC ZC block, stock unmilled ZC head, OEM 88-89 Integra head gasket, your compression ratio would be 9.44:1 </TD></TR></TABLE>thank you, but can you tell me how you got that?? because if i go to the comp. calc. and enter everything dohc zc , except for the pistons (i enterd z6) it bumps me down below 8:1 even thought the pistons are supposed to be 9:1??

 

I entered:

Block
ZC – Bore = 75mm – Stroke = 90mm

Head
ZC – Combustion Chamber Volume = 43.80cc

Piston
Other – Piston Dome Displacement = +4.3cc (From SRP #149196 Piston Specs)

Head Gasket Thickness
D16A6 – 0.048” Bore Difference = 1mm (I forgot this the first time and got 9.44 –with it entered, I got 9.40)

Piston to Deck Height
OEM D16A6 – 0.020” (you can’t use ZC, which is 0.040, as the SRP pistons have a compression height of 29.5mm where the ZC is 29mm – SRP closer to deck)

Compression Ratio = 9.3998:1