» Site Navigation | | » Recent Threads | | | ![](http://www.318ti.org/forum/clear.gif) | ![Reply](http://www.318ti.org/forum/images/buttons/reply.gif) | ![Share/Bookmark](http://static.addtoany.com/buttons/share_save_171_16.png) | 06-13-2008, 09:52 PM | #1 | Senior Member Join Date: Mar 2005 Location: NJ Posts: 1,625 | Metric Pistons Finally! just got my package from Metric Mechanic! 86mm Turbo Pistons (10:1 comp. ratio maintained) $780 H Beam Rods $780 Moly Rings $80 Tri Metal Rod Bearings $140 Expensive as hell, but WTF, you live once right... LOL | | | 06-13-2008, 10:04 PM | #2 | Senior Member Join Date: Oct 2007 Location: Eugene Oregon Posts: 6,182 | nice!! let us know how it goes! __________________ -Josh Sold-1995 318ti, Club Sport, Hellrot Sold-1996 318ti, Active Model, Boston Green Current- 1995 318ti, sport model, schwartz | | | 06-13-2008, 10:05 PM | #3 | Senior Member Join Date: Jan 2008 Location: San Diego Posts: 340 | What manufacturer are those rods / pistons? I'm a little surprised that the piston skirts on plasma-moly coated, considering the price point. The rods look nice, with bushed full floating wrist pins. Are they 5140 chromoly? They look shot peened, properly finished. They look like the Eagle rods I bought for my vette. Are those ARP rod cap bolts? Be sure to get torque specs from the hardware vendor, the rod vendor, and Metric. Compare the torque specs, and if there is any discrepancy, raise hell to find out why... When I did my last build, everyone was quoting a different number. The way to do it correctly is to buy a jig that measures rod cap bolt stretch while under torque, but who the hell has one of those anyways? I certainly don't. Are the pistons dished, relieved, or both, or just flat-topped? Just curious about how they achieved their specific CR. I'm assuming you went through and calculated the dynamic CR? I'm assuming they're forged? 4150? What rod bearings? That's really pricey for rod bearings. A top-end set of Clevites should only set you back about $80 for their H-series. Course I dunno, perhaps they charge a premium for import parts. Using a stock crank? Check that the journal fillets match up with the rods... e.g. if the rods have wide journal fillets and the crank is stock, you might end up with problems. __________________ ![](image.php?s=45389236ec113f024c8fcc524533b713&u=5368&type=sigpic&dateline=1207589119) 1/1997 M44 ti M-Sport Schwartz II | | | 06-13-2008, 10:06 PM | #4 | Senior Member Join Date: Jan 2008 Location: San Diego Posts: 340 | ooh... and you're going to have the whole assembly balanced, right? it's well worth the $250... and no, they shouldn't be charging you much more than $250-300 for a full balance. __________________ ![](image.php?s=45389236ec113f024c8fcc524533b713&u=5368&type=sigpic&dateline=1207589119) 1/1997 M44 ti M-Sport Schwartz II | | | 06-13-2008, 10:14 PM | #5 | Senior Member Join Date: Oct 2007 Location: Eugene Oregon Posts: 6,182 | ohhh mark send me one of those please and i'll reproduce a set for myself, i have a buddy with a cnc and i have the software to design __________________ -Josh Sold-1995 318ti, Club Sport, Hellrot Sold-1996 318ti, Active Model, Boston Green Current- 1995 318ti, sport model, schwartz | | | 06-13-2008, 10:45 PM | #6 | Senior Member Join Date: Mar 2005 Location: NJ Posts: 1,625 | What manufacturer are those rods / pistons? **not sure - Teddy from Metric mention mentioned that they got someone who CNCs all the pistons for them - I never asked who though. I'm a little surprised that the piston skirts on plasma-moly coated, considering the price point. The rods look nice, with bushed full floating wrist pins. Are they 5140 chromoly? They look shot peened, properly finished. They look like the Eagle rods I bought for my vette. **again, not sure who makes them - only markings they have are as follows: Y5430 on the rod arm & UE398 on rod caps. Are those ARP rod cap bolts? Be sure to get torque specs from the hardware vendor, the rod vendor, and Metric. Compare the torque specs, and if there is any discrepancy, raise hell to find out why... When I did my last build, everyone was quoting a different number. The way to do it correctly is to buy a jig that measures rod cap bolt stretch while under torque, but who the hell has one of those anyways? I certainly don't. ** Yes they are 3/8" ARP 2000 bolts & the spec simply saiz 45 ft. lb. Are the pistons dished, relieved, or both, or just flat-topped? Just curious about how they achieved their specific CR. I'm assuming you went through and calculated the dynamic CR? I'm assuming they're forged? 4150? **Yes they are flat top & certainly forged - 13% silicone content too. Metric has an entire explanation on their site as far as piston design - rings are moved lower down the piston for heat dispersion (that much I do remember) LOL What rod bearings? That's really pricey for rod bearings. A top-end set of Clevites should only set you back about $80 for their H-series. Course I dunno, perhaps they charge a premium for import parts. ** they are Clevite 77 Tri Armor - CB 1775 HK1. Using a stock crank? Check that the journal fillets match up with the rods... e.g. if the rods have wide journal fillets and the crank is stock, you might end up with problems ** Yeah its gonna be a stock M44 crank & I will check but I'm sure they'll fit - these guys (Metric Mechanic) seem amazing as far as knowledge... I will have the whole assembley balanced - I already found a reputable race shop to open up the cylinders & put everything together. I'm also excited they managed to keep my 10:1 (well, 9.68:1 + Cometic head gasket = 10:1) compression - by means of using (I think he said) M42 rod & wrist pin design - and so appearently when combined with a M44 crank maintains 10:1 comp while increasing displacement to 2.0... It should all work flawlessly (I hope). Check them out - freaking sick stuff & they are super friendly to boot. http://www.metricmechanic.com/pdfs/m...ne-booklet.pdf http://www.metricmechanic.com/ | | | 06-13-2008, 10:55 PM | #7 | Senior Member Join Date: Mar 2005 Location: NJ Posts: 1,625 | ![Biggrin](http://www.318ti.org/forum/images/smilies/biggrin.gif) too funny... LOL Quote: Originally Posted by thesk8nmidget ohhh mark send me one of those please and i'll reproduce a set for myself, i have a buddy with a cnc and i have the software to design ![Smile](http://www.318ti.org/forum/images/smilies/icon_smile.gif) | | | | 06-14-2008, 08:38 PM | #8 | Senior Member Join Date: Sep 2007 Location: asdfasdf Posts: 10,002 | Quote: Originally Posted by marko ![Biggrin](http://www.318ti.org/forum/images/smilies/biggrin.gif) too funny... LOL | I have a better idea, send them to me and give me the money to have them installed in my car | | | 06-14-2008, 08:56 PM | #9 | Junior Member Join Date: Jan 2008 Location: U.S. Posts: 19 | Nice set off upgrades you got there. | | | ![Reply](http://www.318ti.org/forum/images/buttons/reply.gif) | Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | | Posting Rules | You may not post new threads You may not post replies You may not post attachments You may not edit your posts HTML code is Off | | | |