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  • JE, Arias, BRC, Weisco,....

    Does anyone know if there is an "off the shelf forged piston" that anyone makes for the stock W series engine that uses the stock wrist pin size? Or is this a "you have to get your rods machined out" Kinda thing only. I know you can have a set custom made but my friend is doing pistons and he doesnt care what piston he gets just so long as it is forged and it has the stock W series wrist pin. He will machine them if he needs to but doesnt want to if he doesnt have to.

    Thanks guys.
    85 Z31 6.0 LSX turbo 766whp/792wtq
    04 GTO, LS6, big cam, porting, N20... underway for summertime daily driver.

  • #2
    do our rods have pin bushings? i havent seen a rod without a piston attached to it so i don't know ,i do know porsche rods do have bushings/journal bearing loooking thing at the small ends .

    would you ream the rod to fit the z32 type bushhing/bearing or just ream the bushing/bearing itself? also i thought you would have to get the rod/piston combo balanced anyway? (machining)

    anyway ... this site has a bunch of different brands listen under z31 but i don't know if its the right pin diameter , its the only thing i could ever remember seeing having forged pistons listed under z31 sooo...blah!

    https://www.amzperformance.com/z31/?pag ... be095e3a4e

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    • #3
      IIRC, ford 4.6 forged pistons use the same pin size as the Z31, but they are a few thousandths different on compression height (shouldnt be much of a difference) and a bigger bore. If you were willing to bore your vg30 out a few mm, they would fit.

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      • #4
        yes the rods have pin bushings. I would assume that you would machine out the actual rod to twin turbo size and then get a bushing that fits. Also when you get your rotating assembly balanced they do not machine out the rods to fit the pistons on. That costs extra LOL.

        Defrag010- Thats pretty interesting. Is it the same pin size as the W series or the non W series? I am pretty sure they are different.Also, how many millimeters is a few? stockers are 87mm. You are not supposed to bore it at all, but a few guys have taken it to a 3.1 liter. but I think anything more than that would be too big from what I have learned.

        EDIT: Just looked on AMZ and they sell the escort pistons that have a bore of 90mm making it a 3.2. also a 32mm wrist pin. but they want like $1500 or somthing like that LOL. I guess he can just get his rods machined out. No biggie.
        85 Z31 6.0 LSX turbo 766whp/792wtq
        04 GTO, LS6, big cam, porting, N20... underway for summertime daily driver.

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        • #5
          Or you could get a set of TT rods for $60 like me. I had people PM'ing me like crazy when I put up a WTB ad on 300zxclub
          1987 300ZX Turbo - http://www.z31performance.com/forum/vie ... php?t=3114
          2001 Tiburon Turbo 60-1 270whp/268tq

          No cupholders? Where am I gonna put my beer????

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          • #6
            Evil Z31 wrote: Or you could get a set of TT rods for $60 like me. I had people PM'ing me like crazy when I put up a WTB ad on 300zxclub
            I have a set of TT rods I could sell him right now but he wants to see if he can retain the stock rods as they are plenty strong. BTW, its not for me. My engine is fully built.
            85 Z31 6.0 LSX turbo 766whp/792wtq
            04 GTO, LS6, big cam, porting, N20... underway for summertime daily driver.

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            • #7
              I "think" Ross has a set. When I got mine they made a comment about the stock size. Since mine are oversize I didn't pay much attention.
              http://z31performance.com/forum/viewtopic.php?f=5&t=147

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              • #8
                Did you measure the small end of his rods already? (why does this always sound gross when I read it?) How about big bore out of round? Unless they are well in spec, they would need to be reamed and perhaps reconditioned, which costs at least $100/set anyway so you might as well find some Z32 rods. Of course then I would never feel right reassembling without new rod bolts, blah blah. Maybe I'm just a freak for doing too much work.

                Steve88t wrote: I "think" Ross has a set. When I got mine they made a comment about the stock size. Since mine are oversize I didn't pay much attention.
                I probably forgot to tell you that Ross was unwilling to sell me a single set of 6 pistons for less than an astronomical price as a private buyer. When I provided a taxID the price came down a lot, but it was still more than a set of the weisco pistons that are oh so popular. This is for the next project, I guess I was very lucky in finding the BRC pistons my 84T engine has for so cheap.

                Arias seems like the next logical avenue to investigate. The nice thing is I hear they will let you select the alloy of the pucks they are machined from so you can get what you need in terms of strength AND noise/longevity. Piston slap is annoying, and hypereutectic pistons are nice for the low expansion rate... which is why most factory pistons are cast to begin with but meh.

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                • #9
                  He hasnt measured his small or large end of the rods. If he does decide to go TT rods then he would have to make sure those rods are in spec too though. I guess, all in all it may just be easier for him to get a set of TT rods since his rotating assem. is going to have to be balanced anyways, no matter what pistons he ends up running. That and if he can get a set of TT's for under $100 then hell, why not right?
                  85 Z31 6.0 LSX turbo 766whp/792wtq
                  04 GTO, LS6, big cam, porting, N20... underway for summertime daily driver.

                  Comment


                  • #10
                    SATAN wrote: Is it the same pin size as the W series or the non W series? I am pretty sure they are different.
                    I believe the non-w wrist pins were of a larger diameter compared to the floating W series wrist pins.

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                    • #11
                      SATAN wrote:

                      Defrag010- Thats pretty interesting. Is it the same pin size as the W series or the non W series? I am pretty sure they are different.Also, how many millimeters is a few? stockers are 87mm. You are not supposed to bore it at all, but a few guys have taken it to a 3.1 liter. but I think anything more than that would be too big from what I have learned.
                      the ford 4.6 piston is .866 or 22mm wristpin. What's the stock wristpin size for early vg30's? I know one is 21 and the other is 22mm.

                      Stock bore 4.6's are 90.2mm, so that would be 2.2mm overbore. At work, we've had to bore out a VG30 to VG33 bore to use in an Xterra, and the block was fine... so a 4.6 piston should be at home. comp height on vg30 pistons are 1.26", comp height on 4.6 is 1.214". So, on stock rods, a 4.6 piston would sit down .046".. lowering your CR by .7.

                      If you could get some ford 4.6 5.933" rods, only thing is now your .184" in the hole.... surface .020" off the block, now you're about at .164"... lowering your comp down 1.5 points... Then, you surface the head to get the chamber size down and raise the comp up about a half to 3/4 of a point, and now you're at between 1.7 and 1.4 lower compression. To do that, you would just need to get some custom bearings made. Ford 3.8L rods might work better since they are .020" longer than stock VG30 rods, but I don't know the big end bore and wristpin size... and I don't know if anyone makes off the shelf aftermarkets for them..

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                      • #12
                        venolia and brc will make you any piston you want. Worst case you must send them one piston to guage by. I am sure these guys have vg30e/t pistons in their specs by now. Why your friend would spend on forged and not get rods built too? I dunno. He should seek out a TT guy that bought forged pistons and never completed the project, get the rods and pistons from him and hope they spec.

                        Ross doesn't make a vg30e piston off the shelf. Arias I am not sure. I have a set of Arias in my z31 and they have held up nicely for 6 years now. They are TT also. Arias does allow you to pick your silicon content so you can go full race or get some that don't slap as much when cold.

                        Again, sounds like your friend could probably find some project on tt.net that needs to sell out and be setup.
                        "If you don't hold it....you don't own it"

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                        • #13
                          defrag010 wrote: At work, we've had to bore out a VG30 to VG33 bore to use in an Xterra, and the block was fine.
                          I'd love to see some more information on that. There is a LOT of internet rhetoric on the subject of how far a vg30 can be bored. And as it is rhetoric, there is almost NO documentation or even quantified measurements to back up the claims either way.
                          http://z31performance.com/forum/viewtopic.php?f=5&t=147

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                          • #14
                            I called pretty much everyone for a set off the shelf, and everyone wanted a 3-4 week wait and the piston specs. I didn't feel like waiting when I could have found the TT rods and Wisecos in a week for $650 total. Then got the ARP rod bolts for $52.
                            It was too cheap, fast, and easy to pass up. :wink:
                            1987 300ZX Turbo - http://www.z31performance.com/forum/vie ... php?t=3114
                            2001 Tiburon Turbo 60-1 270whp/268tq

                            No cupholders? Where am I gonna put my beer????

                            Comment


                            • #15
                              Jason84NA2T wrote: This is for the next project, I guess I was very lucky in finding the BRC pistons my 84T engine has for so cheap.
                              I got an almost new set of brc pistons with je wristpins and what looks like reconditioned rods with new rod bolts for $360 :lol:

                              i will post pics later today
                              Bolt on, fast, z31. You can only pick two.
                              Old weaksauce numbers: 391hp/433tq

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