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Old 10-15-2009, 08:23 PM   #1
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what forged piston to use in my setup????

I'm trying to find forged pistons that are in the same factory compression (11:0:1), anyone know where I get one??? or what piston setup do you recommend for mi case? my engine is a k20z1 @ 11 psi , if somebody have a part number will be good.

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Old 10-15-2009, 08:29 PM   #2
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look into 4032 pistons, unless you plan on putting nitrous on it and going for gt35 turbo type power levels. the 4032 piston has a higher silicon content and will not expand and contract as much as 2618 pistons. much friendlier on your bottom end. it's still a forged piston and plenty strong enough to hold up to anything (within reason) the m62 can throw at it.
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Old 10-15-2009, 08:31 PM   #3
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86.5mm will be my new size
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Old 10-15-2009, 08:31 PM   #4
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I agree with Wes on that. 4032 is where you want to be. I believe both Mahle and Supertech use that alloy. Also, OEM pistons are fine for your application as long as the car is well tuned.
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Old 10-15-2009, 08:49 PM   #5
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Originally Posted by wesessiah View Post
look into 4032 pistons, unless you plan on putting nitrous on it and going for gt35 turbo type power levels. the 4032 piston has a higher silicon content and will not expand and contract as much as 2618 pistons. much friendlier on your bottom end. it's still a forged piston and plenty strong enough to hold up to anything (within reason) the m62 can throw at it.
you know where i can find pistons with that alloy in 86.5mm and 11:0:1?????
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Old 10-15-2009, 08:55 PM   #6
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I agree with Wes on that. 4032 is where you want to be. I believe both Mahle and Supertech use that alloy. Also, OEM pistons are fine for your application as long as the car is well tuned.
i thinking put forged pistons , but the issue is that y check both websites and they dont have 11:0:1 cr, my last option is the oem pistons over size to 0.25 . what you think about my idea o the oem pistons ??? is good????
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Old 10-15-2009, 08:59 PM   #7
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11 psi needing forged pistons? I could understand wanting to replace the rods to something beefier. Are you replacing rods AND pistons and researching some piston info? That would make sense, and i would also recommend a 4032 alloy.
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Old 10-15-2009, 09:07 PM   #8
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11 psi needing forged pistons? I could understand wanting to replace the rods to something beefier. Are you replacing rods AND pistons and researching some piston info? That would make sense, and i would also recommend a 4032 alloy.
theres no problem if i want to continue using the stock pistons???? how many psi the stock piston can handle???
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Old 10-15-2009, 09:15 PM   #9
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a good portion of the time, those companies will make something that's not necessarily mentioned. you can ask chris (k20a2) the site owner, or email one of those companies and ask if they offer what you're looking for. back in my b-series days wiseco was known for offering more than what they listed, though i think they only deal in 2618. like mentioned by these fine fellas, forged isn't necessary. the only person i know of on this board to go through pistons from their heat tolerance is scuffers, who races... i don't mean like going to the drag strip every now and then.
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Old 10-15-2009, 09:25 PM   #10
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Quote:
Originally Posted by wesessiah View Post
a good portion of the time, those companies will make something that's not necessarily mentioned. you can ask chris (k20a2) the site owner, or email one of those companies and ask if they offer what you're looking for. back in my b-series days wiseco was known for offering more than what they listed, though i think they only deal in 2618. like mentioned by these fine fellas, forged isn't necessary. the only person i know of on this board to go through pistons from their heat tolerance is scuffers, who races... i don't mean like going to the drag strip every now and then.
thanks for your help guys ,
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Old 10-15-2009, 09:29 PM   #11
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Quote:
Originally Posted by ditorsx View Post
theres no problem if i want to continue using the stock pistons???? how many psi the stock piston can handle???
the weak point on your motor is the rods, scuffers talked about how they werent as tough as the a2 rods. With a good tune you wont have much to worry about with 11 psi.
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Old 10-16-2009, 09:03 AM   #12
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The Supertechs I'm running are holding up well. I would recomend them.

They show a 11.2:1 version, call Chris at the CRSX store, he'll get them for 'ya. http://www.supertechperformance.com/

Piston part# P4-HK86-P6
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Old 10-17-2009, 09:06 AM   #13
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Quote:
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The Supertechs I'm running are holding up well. I would recomend them.

They show a 11.2:1 version, call Chris at the CRSX store, he'll get them for 'ya. http://www.supertechperformance.com/

Piston part# P4-HK86-P6
thanks sharper , i will check those
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Old 10-17-2009, 09:09 AM   #14
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what you guys think about the acl bearings, im trying to get the oem , but i dont know what color i have to use ,my engine is relative new , like just 20k miles only , what you guys suggest me????
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Old 10-17-2009, 10:15 AM   #15
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what you guys think about the acl bearings, im trying to get the oem , but i dont know what color i have to use ,my engine is relative new , like just 20k miles only , what you guys suggest me????
Have used ACL a lot...

they are great, HOWEVER!

1) you have to spend the time sizing them - this takes hours
2) they are hard as nails (compared to OEM), so they will not tolerate *ANY* contamination, clean room builds are essential

if you don't have the skills/tool/etc to do this, then stick with OEM.
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