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To those of you considering aftermarket forged pistons... - Page 4 - Subaru Legacy Forums

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#46: 03-22-2010, 04:39 PM
 
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Title: Living the dream
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what are you willing to give up to get what you think you need?


Stay Stock Stay Happy
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Stay Stock Stay Happy
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#47: 03-22-2010, 04:42 PM
 
Title: Too Big to Fail
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Nothing - forged pistons are better than stock POS pistons!

That's what I've read Image (Asset 21/32) alt=
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#48: 03-22-2010, 04:53 PM
 
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Quote:
Originally Posted by rao Image (Asset 26/32) alt=
nothing - forged pistons are better than stock pos pistons!

That's what i've read Image (Asset 27/32) alt=
+1
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Stay Stock Stay Happy
#49: 03-23-2010, 06:27 AM
 
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Title: Burning Monkey
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If stock are POS Rao, how come there are so many people running ~50% more power than stock for so many thousands of miles without problems? Huh? Why?

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#50: 03-23-2010, 06:39 AM
 
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Quote:
Originally Posted by rao
Nothing - forged pistons are better than stock POS pistons!

That's what I've read
Goddamn you with your sarcasm!!! I never know when you're being serious.
#51: 03-23-2010, 06:49 AM
 
Title: Flying W00t Monkey
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I had the same trouble when I lost my cyl#4 ringland... very tough to separate the sarcasm (or humor, depending on how you are looking at it) from the good info.

Your goals are not that far off from mine, power-wise. My engine rebuild thread may be relevant for you, since I hashed out the whole aftermarket/OEM piston thing too.
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#52: 03-23-2010, 07:00 AM
 
LGT-NY
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I'll take a look, thanks bro.
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#53: 03-23-2010, 11:00 AM
 
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Quote:
Originally Posted by bosco
Stay Stock Stay Happy
The older I get, the more wisdom I see in this statement.
#54: 03-25-2010, 01:02 PM
 
Title: AARP fuhrer
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A compromise between piston strength and engine durability would seem to me to be what many people would be looking for in a somewhat modded daily driver. Wondering if such a thing exists
#55: 03-25-2010, 01:22 PM
 
Title: RS4 killer
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Quote:
Originally Posted by ScoopMan
A compromise between piston strength and engine durability would seem to me to be what many people would be looking for in a somewhat modded daily driver. Wondering if such a thing exists

It does.

Top-notch machining, a competent builder and cossy pistons.
#56: 03-26-2010, 10:13 AM
 
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Quote:
Originally Posted by Boostin
The extra clearance means a couple things. It gives the aftermarket pistons more room to expand in the cylinder, and this may be good for very intense driving and high horsepower setups. You don't want your pistons to seize. However, because the clearance is greater, your motor will have increased blowby and increased wear on the cylinder walls.
I thought rings did the sealing between piston and cylinder, so why would you get increased blowby with forged pistons?
I do a leakdown test and still measure less than 12% leakage. So what would you get from a stock setup?
#57: 03-26-2010, 10:18 AM
 
Title: Twinscroll troll
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The blowby is there when the engine is cold. Should seal right up when hot.

12% leakage is fairly high. Any oil consumption?
#58: 03-26-2010, 10:24 AM
 
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That's measured cold.
No not a drop in about 10,000km so far.
#59: 03-26-2010, 11:00 AM
 
Title: Twinscroll troll
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Yeah, cold leakdown would be ok. Who built your engine?
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#60: 03-26-2010, 12:01 PM
 
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Fix it you mean...Me
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