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Old 01-12-2014, 06:25 PM   #76
makofoto
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Is that green "teflon" coating on new Suby engines on the pistons or the cylinder walls?

And correct me if I'm wrong ... it's suppose to help protect against piston slap on the boxer engine?

Thanks ... [email protected]
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Old 11-20-2014, 05:32 AM   #77
TGM2
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Many thanks for this Unabomber. Great information.
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Old 12-03-2014, 09:29 PM   #78
Kcwiro
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Unabomber.. my head just asploded... good info long over due thank you for providing!
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Old 12-10-2014, 11:28 PM   #79
neven22
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great read ,,,,
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Old 04-29-2015, 08:45 AM   #80
GotMeUnderPressure
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Quote:
Originally Posted by Kcwiro View Post
Unabomber.. my head just asploded...
I'm glad I was not around to witness your "digestive malfunction". Another failed ringland?

Thanks for this FAQ!
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Old 05-31-2015, 12:08 AM   #81
joe_r
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Quote:
Originally Posted by RalliSpec View Post
A few comments....


3) It is only assumed that USDM STI pistons are hypereutectic although their problems seem to bear this out. Older JDM STI models with forged pistons (Ver.7 and older) used 4032 alloy pistons. There are some newer cast alloys that have been developed with higher tensile strengths and improved ductiliy...its possible that they are being employed on JDM STI models rather than hypereutectic alloys. Who knows. But the change from forged to cast pistons was probably necessary to meet stricter emissions standards.
JDM sti motors used forged pistons?! This was the information i was looking for, but didn't know i was looking for.
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Old 06-07-2015, 11:06 PM   #82
shoemaker6009
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Awesome thread new to the world of engines really appreciate all the information contained within your threads.
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Old 06-26-2015, 01:51 PM   #83
J.B.M.
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Well done, lots of great stuff in there!

I'm rebuilding a stock NA ej251 with OEM pistons and rings and would like to know what is a good approach for determing the proper fit of the oil expander ring? Should it have a similar gap as the oil rails?

I have the sensation the tension from the expander ring is a little high and the gaps from the oil rails can be seen on the cylinder walls when dropping in the pistons.

Any help would be much appreciated!
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Old 01-14-2017, 09:03 PM   #84
OliAnon
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Thanks for all your FAQs, Ron!
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Old 02-16-2017, 11:45 AM   #85
2014wrxct
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Good Info thanks
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Old 02-03-2018, 02:14 PM   #86
SpreadmasterFresh
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Wow guys ths is why this site is so awesome. So much useful information.
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Old 03-21-2018, 05:27 PM   #87
_WRXwv_
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this is all great stuff i learned more about pistons and rods in the last hour than ever. i am rebuilding my engine on my 2012 wrx.. i want to post a thread about it but i have to have 3 legit posts
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Old 06-15-2018, 11:57 AM   #88
Jput97
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Thanks man I’ve been debating whether or not I should make the change but could never find anything to really help me out that much!
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Old 10-24-2020, 10:50 PM   #89
GeoNV
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Just got my Manley 100mm 612005-c pistons in and wanted to post the weights.

Pretty close weights. I’ll weigh the wrist pins tomorrow.
416.8 grams
416.2
416.6
416.1
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Old 01-27-2021, 05:19 PM   #90
Rootini
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Really good info, thanks for the read
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Old 02-03-2021, 04:27 PM   #91
jetjaguarxp
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Excellent write up.

Thank you for the information!
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Old 07-31-2022, 11:35 AM   #92
Ollieparker1990
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Really good read. Helps making the decision which pistons to use in the wife’s new build
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Old 03-27-2023, 10:33 PM   #93
iamabillionaire
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Hi,

I am new and trying to understand navigation of the site/forums, etc. I'm looking to get some info on repairing/replacing the engine of a 2005 Saab 9-2x, which is just a Subaru WRX, four-door wagon, with a 2.5L Linear. Everything under the hood is Subaru. Although, I'm sure you are familiar. It recently has been diagnosed as having a blown head gasket, after initially thinking it was the water pump(water pump and timing belt replaced). It still cranks and runs, etc. The crazy part of it all is how ironically good the engine is-to it's own detriment. Now, in hindsight I realize the issue came to a head after running for over a year, with no overt symptoms/signs of not having any fluid in the system; until eventually and finally beginning to stall the engine, once hot enough, in order to save itself. However, it was too late.

Any information on most affordable parts, best sources, options, ideas or best way to seek buyers for a good fixer upper, would be greatly appreciated.

Thank you
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Old 03-27-2023, 10:35 PM   #94
iamabillionaire
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Hi,

I am new and trying to understand navigation of the site/forums, etc. I'm looking to get some info on repairing/replacing the engine of a 2005 Saab 9-2x, which is just a Subaru WRX, four-door wagon, with a 2.5L Linear. Everything under the hood is Subaru. Although, I'm sure you are familiar. It recently has been diagnosed as having a blown head gasket, after initially thinking it was the water pump(water pump and timing belt replaced). It still cranks and runs, etc. The crazy part of it all is how ironically good the engine is-to it's own detriment. Now, in hindsight I realize the issue came to a head after running for over a year, with no overt symptoms/signs of not having any fluid in the system; until eventually and finally beginning to stall the engine, once hot enough, in order to save itself. However, it was too late.

Any information on most affordable parts, best sources, options, ideas or best way to seek buyers for a good fixer upper, would be greatly appreciated.

Thank you
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