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Old 07-30-2009, 04:53 PM   #1 (permalink)
 
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Default Urgent Help needed What pistions are these

Hey guys ive come all the way from nzcrx.com and nzhondas.com

Im looking to find out what sort of pistions these are so i can buy rings accordingly
according to this post [URL="http://nzhondas.com/forum/forced-induction/96753-high-boost-dohc-zc-parts-suggestions-rings.html"]


I know my rods are eagle 5394AHO

But pistions have no brand or markings on them at all







Sorry about this photo its just to show they are not dished at all




Anyone seen them before?
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Old 07-30-2009, 04:54 PM   #2 (permalink)
 
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sorry should add they give 8.8:1 cr with a 3mm headgasket with a 43cc combustion chamber on a dohc zc
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Old 07-30-2009, 04:55 PM   #3 (permalink)
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make your pictures smaller. looks like srp pistons
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Old 07-30-2009, 04:55 PM   #4 (permalink)
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Use feeler gauges to meaure the ringlands. They're not stamped anywhere on the inside?
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Old 07-30-2009, 04:55 PM   #5 (permalink)
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pm3 pistons. they came in b7 and b8 d15's.
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Old 07-30-2009, 04:56 PM   #6 (permalink)
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make your pictures smaller. looks like srp pistons
SRP's are stamped on the inside.
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Old 07-30-2009, 04:58 PM   #7 (permalink)
 
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they are definitly not factory pistons, would have been built in 2001 (last owner)

No stamps at all if they were pm3 they would have be stamped

so id say at a guess non dished gives aprox 9:1 cr on a stock headgasket like a stock motor but forged ? cant be out of a sohc as would give a way lower cr in the dohc

Last edited by thecrx; 07-30-2009 at 05:02 PM.
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Old 07-30-2009, 05:02 PM   #8 (permalink)
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they are definitly not factory piston
How do you know?
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Old 07-30-2009, 05:03 PM   #9 (permalink)
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they are definitly not factory pistons, would have been built in 2001 (last owner)

No stamps at all
how do you know there not factory if you see no marks on them?
they look like a normal piston from like a b7 or a6
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Old 07-30-2009, 05:05 PM   #10 (permalink)
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they are definitly not factory pistons, would have been built in 2001 (last owner)

No stamps at all if they were pm3 they would have be stamped

so id say at a guess non dished gives aprox 9:1 cr on a stock headgasket like a stock motor but forged ? cant be out of a sohc as would give a way lower cr in the dohc
I had forged srp's out of an a6 in my dohc zc.

And I agree with cervan and sleepy...PM3's.
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and yes, i is a accedentally bamf status
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Holly hell man! I couldn't do that much damage to a motor on a three day weekend/bender with a jackhammer and a quest from the Lord.
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Old 07-30-2009, 05:18 PM   #11 (permalink)
 
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wouldnt they have pm3 stamped on them? and they all machined up awsome just like a srp
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Old 07-30-2009, 05:21 PM   #12 (permalink)
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wouldnt they have pm3 stamped on them? and they all machined up awsome just like a srp
If they were OEM yes. The could be aftermarket cast PM3's, in which case they wouldn't be stamped.
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Tyranny does not always burst through your front door wearing body armor and brandishing an assault rifle. Sometimes, it waltzes through your living room and sweeps you off your feet. Sometimes, it promises warmth and safety. Sometimes, tyranny invites you out to the party and makes you feel like you belong.
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and yes, i is a accedentally bamf status
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Holly hell man! I couldn't do that much damage to a motor on a three day weekend/bender with a jackhammer and a quest from the Lord.
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Old 07-30-2009, 07:56 PM   #13 (permalink)
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if they are SRP's look for forged marks, if they are cast they are stock pm3 pistons trust me on this. And if they arent stock, they are aftermarket nippon or mahle pistons.
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Old 07-30-2009, 08:01 PM   #14 (permalink)
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the op should def be able to tell if they are forged or not... totally differnet looking material.
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NEW best 60' 1.56!!!
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Old 07-31-2009, 12:54 AM   #15 (permalink)
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NO way those will give 8.8:1 compression in a DOHC ZC head.

Need better pics and the numbers off the pistons.
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Old 07-31-2009, 07:56 AM   #16 (permalink)
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NO way those will give 8.8:1 compression in a DOHC ZC head.

Need better pics and the numbers off the pistons.
I got 8.6:1 with a dished SRP A6 piston (dish was smaller than stock) in my DOHC ZC and the comp height of the PM3 is higher + no dish of the Pm3 = he should be good to go.
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Tyranny does not always burst through your front door wearing body armor and brandishing an assault rifle. Sometimes, it waltzes through your living room and sweeps you off your feet. Sometimes, it promises warmth and safety. Sometimes, tyranny invites you out to the party and makes you feel like you belong.
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and yes, i is a accedentally bamf status
Quote:
Holly hell man! I couldn't do that much damage to a motor on a three day weekend/bender with a jackhammer and a quest from the Lord.
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