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Hp Vs. $

Discussion in 'Engine Building' started by punx04, Mar 22, 2003.

  1. punx04

    punx04 Member

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    which will get me the most hp for the buck....getting zc pistons or gettin srp 11:1 pistons...(remember i can get a bigger bore size on the srp pistons....soo that will ad even more)
     
  2. Domeskilla

    Domeskilla Senior Member

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    What head are you using? 'Course the forged pistons are better, but what do they cost? ZC pistons, with a Y8 head will yield roughly 12.X:1 (huge post with a chart on honda-tech about that).. ZC pistons are around 50 or so each. So, you decide. :)
     
  3. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    DOHC ZC pistons in a Z6 head will get you about 12.0:1 compression, and in a Y8 head will yield something like 12.6:1 to 12.8:1. I did the calculations a while back... and I'm pretty sure those are the right numbers. From a dealer, OEM pistons should cost you about $30-40 each, plus rings. OEM pistons are also available in .5mm overbore for engine rebuilds, so you might want to look into those as well.
     
  4. punx04

    punx04 Member

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    oh sorry i got a d16a6 (non vtec d series si) and how much of a hp difference do u think the forged 11:1 pistons with a, i deno...minor oversize bore compared to the oem .5mm oversized ze pistons?soo basicly coming back to my original question is it worth saving for srp pistons which are $400 and i have a minimum wage job with few hours....or should i jez go for the zc pistons
     
  5. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    By my calculations, ZC pistons in a D16A6 should yield 10.8:1 compression. You should be able to pick up a set new with rings for about $200 or less, used for even less than that. It's up to you. If you're staying all-motor, then OEM cast pistons won't be bad at all. Boost, you'll want to get forged pistons, but raising compression isn't something you usually want to do before boosting, so I assume you're staying all-motor. It's up to you to decide if you want to pay twice as much for 0.2:1 more compression.
     
  6. punx04

    punx04 Member

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    yea, i'll just stick with the oem pistons ....soo wut is the exact name for zc pistons i want? and wut car did it come from?and they came in a 75mm and 75.5mm? or how big can i get them?
     
  7. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    WHAT, not WUT.

    The ZC pistons carried the code of "PM7", and came in the 88-91 JDM Civic Si. The P29 pistons from the D16A1 (USDM 88-89 Integra) have the same specs, and might be a little easier to get through a US dealer. They should both be available in 75.0mm and 75.5mm from the factory. Larger bores will require custom pistons.
     
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