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PR3 or P73 pistons

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PR3 or P73 pistons

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    PR3 or P73 pistons

    Need some help deciding which to go with. I am rebuilding a B17 with Skunk IM, CTR cams, and either PR3 usdm b16 or P73 usdm itr pistons. I want to stay with OEM pistons. I also have I/H/E already. I live in cali so I need to pass smog. Thanks in advance!

    #2
    Increasing CR will raise exhaust temps and probably raise NOx. It looks like the P73's will give you a little less CR, but they do take machining to fit onto b17 rods. The .01 difference in CR is probably not significant.

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      #3
      curious, are skunk2 IM's even smog legal in cali?

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        #4
        Yep the Skunk2 IM for B series engines are carb legal in cali its one of the main reasons I bought it. Does anyone know how high of a CR I can go? I checked both C speed and Zeal calculators for the CR on my car the C speed had 10.7 with PR3 and 10.2 with P73A0 (which I think is a little off) And on zeal 10.7 with PR3 and 10.5 with P73A0

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          #5
          are you going to boost it or stay na?

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            #6
            Originally posted by Squeezethis View Post
            curious, are skunk2 IM's even smog legal in cali?
            Just remember that intake manifold maybe legal but if you add a header and intake it will void that out.


            And for the pistons look for some Y.C.P/Vitara Pistons

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              #7
              staying NA

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                #8
                The pr3's would be good. If you want higher cr go with p73-00 since it's not going to take rod machining.
                Im in a similar boat with my b17 I lost my rings in #1 so Im throwing new parts in all around...
                Though like scratchy said you're going to raise those NOx levels... I don't know cali's rules on emissions and stuff so all I can say more CR:More power =p

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                  #9
                  Originally posted by akuma03 View Post
                  Yep the Skunk2 IM for B series engines are carb legal in cali its one of the main reasons I bought it. Does anyone know how high of a CR I can go? I checked both C speed and Zeal calculators for the CR on my car the C speed had 10.7 with PR3 and 10.2 with P73A0 (which I think is a little off) And on zeal 10.7 with PR3 and 10.5 with P73A0
                  carb legal........ but is there a carb # thingy? if so is it year specific cuz i'm pretty sure everything that has a carb # has a year range. i work right next to a referee station, and i've seen many many many hondas and other vehicles fail bcuz the year of the carb stamp was off cuz they do look at those #'s. and i dunno if u have a gsr or just have b17 in there...... but if that or anything else isn't legit with ur year then you're screwed.

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                    #10
                    go with pr3 or JDM p30s

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                      #11
                      It's a 93 GSR no swap. I'm in colorado though so emissions are less strict... it's hard enough to get the dam things to run at this altitude. I know min has a cali carb legal aem intake cause that's where it came from. Also running the dc 4-2-1 header that came from out there so... it should be coo to go with the type-r pistons and intake/exhaust.... my 0.02

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                        #12
                        I rebuilt my B17A1 with some PR3 pistons.

                        Plus they dont require any machining unlike the Type R pistons.

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                          #13
                          Originally posted by thatblkguy View Post
                          And for the pistons look for some Y.C.P/Vitara Pistons
                          vitaras are for the d-series engines.


                          OP: have you smogged already? i dont think that ctr cams will pass.

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                            #14
                            yall sure the jdm-r pistons require machining?

                            I've got a set with b17 rods that will be up for sale soon...just need rings =)

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                              #15
                              Originally posted by 90DB1T View Post
                              vitaras are for the d-series engines.


                              OP: have you smogged already? i dont think that ctr cams will pass.

                              y.c.p are the makers of the vitaras.

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                                #16
                                Originally posted by thatblkguy View Post
                                y.c.p are the makers of the vitaras.
                                as with other makers.. not the point. i was busting your nuts about the minor mistake of including "vitaras" in your post. relax

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                                  #17
                                  CTR cams should pass smog as long as you have a good cat

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