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Old 06-10-2009, 11:46 AM   #1
miata_racer
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Member#: 109358
Join Date: Mar 2006
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Location: Pearland
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2007 STI
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Default BSP legal pistons

Are there any? I have a friend who needs to replace hers in here 07. And since they are getting replaced...why not put in something that will hold up better?

Looking for something forged of course. Not really caring if it's .020 or stock bore either. Just strong and reliable.
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Old 06-11-2009, 09:14 AM   #2
neilschelly
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Subaru stocks 0.010" and 0.020" standard overbore pistons (or at least they do for the EJ22). They were really cheap for my car too, only $45 or so apiece.

I doubt you'll find much of an aftermarket that would make 0.040" over pistons and be sure they have the same or greater weight as stock, but STis do get a lot more aftermarket attention. At the very least, they won't be as good a value as the Subaru ones.
-N
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Old 06-14-2009, 11:56 PM   #3
miata_racer
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hmmmm,....problem is...the pistons and rings need replacing because of the running too lean with the cobb program on the 07. I was hoping I could find something forged that might hold up better.
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Old 06-23-2009, 11:27 PM   #4
bcblues
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Forged would not be BSP legal.
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Old 06-24-2009, 07:22 AM   #5
mccanixx
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Quote:
Originally Posted by bcblues View Post
Forged would not be BSP legal.
Yes they would. You'd probably have to have them made to insure dimensions/dome, ring sequence, and weight were identical. Most aftermarket ones change some or all of these things.

Read 15.10 S.

To the OP I would just call Mahle, Weisco, etc...talk to them.
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Old 06-24-2009, 12:49 PM   #6
bcblues
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Blue w/ custom bug splat

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Yeah, you are correct. Since there are no BSP legal forged pistons (to my knowledge) available as off-the-shelf parts. I assumed this precluded using them. A clear case of me thinking inside the box.
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