has a v6 sti got forged pistons?
#1
has a v6 sti got forged pistons?
I just want to clear this up, a friend told me his new sti6 has not got these as standard but i thought all sti,s were forged. also while we're on the subject could someone explain what the changes were through the years with the sti's (engine wise). or is there a specification site i could go on to.
Cheers James
Cheers James
#7
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I think this is one for APIDavid to put us right on TBH.
I thought that forged pistons for STi Classics were offered as a cost OPTION when the car was ordered new from the factory? I'm sure I read that from a reputable source . So, if that was the case, then most STi's will probably have them... but not necessarily ALL
I'm sure if you ask David, then he'll proffer that Subaru's 'forged' pistons aren't really worthy of the name i.e. not all that good, in any case.
David?! Where are you when we need you?
I thought that forged pistons for STi Classics were offered as a cost OPTION when the car was ordered new from the factory? I'm sure I read that from a reputable source . So, if that was the case, then most STi's will probably have them... but not necessarily ALL
I'm sure if you ask David, then he'll proffer that Subaru's 'forged' pistons aren't really worthy of the name i.e. not all that good, in any case.
David?! Where are you when we need you?
Last edited by joz8968; 07 November 2008 at 08:48 PM.
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I have no problem admitting my retardedness, it's just something i have to live with unfortunately.
vaguely back on topic, there is probably the usual mix an' match of parts present, so I wouldn't guess at a clear cutoff. Someone who strips a lot like David at API could probably tell us better.
Interested in an above posters comments about the quality of OE forged pistons though - anymore gen?
vaguely back on topic, there is probably the usual mix an' match of parts present, so I wouldn't guess at a clear cutoff. Someone who strips a lot like David at API could probably tell us better.
Interested in an above posters comments about the quality of OE forged pistons though - anymore gen?
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Right you lot - pin your ears back
STi limited editions from 1994 quite often have Subaru brand forged pistons fitted. This may be where the " option " tag has come from, but it may also be that they originally had forged, but have had a rebuild at sometime/ somewhere and the wrong pistons were fitted then. It is a bit too far back in time to be definite about that.
Sti vers 2 RA has the Subaru produced forged pistons fitted as standard MOST Vers 2 RA have have Closed deck block [ let's not go there for the minute ]
Then all STI and STi RA up to Vers 7 [ Bug eye ] have Subaru Forged pistons as standard.
Blob eye & Hawkeye [ & EJ257 ] have hyperEutectic [ usually spelt bullsh*t ] pistons fitted - which are an extremely good product for a manufacturer to use - but totally crap for any sort of performance engine.
The Subaru forged type look similar to a cast piston in shape and design and do not at all look like the billet types that you get from: Cosworth, Omega, Mahle CP, Ross, Wiseco, Wossner, Jun [ cosworth] et al.
Cleared that up then ?
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STi limited editions from 1994 quite often have Subaru brand forged pistons fitted. This may be where the " option " tag has come from, but it may also be that they originally had forged, but have had a rebuild at sometime/ somewhere and the wrong pistons were fitted then. It is a bit too far back in time to be definite about that.
Sti vers 2 RA has the Subaru produced forged pistons fitted as standard MOST Vers 2 RA have have Closed deck block [ let's not go there for the minute ]
Then all STI and STi RA up to Vers 7 [ Bug eye ] have Subaru Forged pistons as standard.
Blob eye & Hawkeye [ & EJ257 ] have hyperEutectic [ usually spelt bullsh*t ] pistons fitted - which are an extremely good product for a manufacturer to use - but totally crap for any sort of performance engine.
The Subaru forged type look similar to a cast piston in shape and design and do not at all look like the billet types that you get from: Cosworth, Omega, Mahle CP, Ross, Wiseco, Wossner, Jun [ cosworth] et al.
Cleared that up then ?
David APi
Agents for:
Simtek, the most exciting new Ecu for years
Buddy Club exhausts
Scoobysportexhausts
Eibach suspension
Hybrid front mount intercooler kits
AP Racing brakes and clutches
And of course; the well known APi Performance Exedy organic clutch
www.apiengines.com
01926 614333
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Just one more point. Sti 3/4/5/6/7 Forged Subaru brand pistons are OK up to circa 400 hp depending upon their mileage.
I would have no hesitation in leaving them in [ assuming good condition generally ] for a 400 hp conversion.
David
I would have no hesitation in leaving them in [ assuming good condition generally ] for a 400 hp conversion.
David
#22
i have a v2 sti. From what your saying this has forged pistons? Im going for 380bhp using bolt on bits. Will the internals handle this on an sti v2? I thought the gearbox was the weekpoint. Soz to hijack thread.
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I'd guess at your gearbox popping before your engine.
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The vers 3 STi on are more modern design pistons and do a good job.
I'd be wary of upping the power too far on something of outdated design and old fashioned manufacture.
Update I reckon.
David APi
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It's one of those words that companies use to make something sound good like they do with womens cosmetics. You know, ' It has hyaluronic betones' OR ' co-ordinated enzymes' That sort of crap - that makes you feel good, but is no better than anything else.
The pistons run NO clearance. If you measure the new bore and the new piston with the sort of equipment that we have in the aftermarket they are exactly the same size.
Dropping names; I had a conversation with Matt Clark when they first came out; relating to ' what do reckon to this ' and we had no firm idea except - that it worked, but shouldn't .
But also that they looked just like the cast pistons from a WRX and therefore couldn't really be trusted as a high performance piston.
It seems that the alloy for the piston has been created to expand at exactly the same rate as the block - so that there is no need for a clearance at first build and therefore should last longer because the surfaces will start off from a lower point, than an engine with a 1 thou clearance.
IN OUR OPINION - Don't ask any more about the damn things I don't really know, I just work here........
David
The pistons run NO clearance. If you measure the new bore and the new piston with the sort of equipment that we have in the aftermarket they are exactly the same size.
Dropping names; I had a conversation with Matt Clark when they first came out; relating to ' what do reckon to this ' and we had no firm idea except - that it worked, but shouldn't .
But also that they looked just like the cast pistons from a WRX and therefore couldn't really be trusted as a high performance piston.
It seems that the alloy for the piston has been created to expand at exactly the same rate as the block - so that there is no need for a clearance at first build and therefore should last longer because the surfaces will start off from a lower point, than an engine with a 1 thou clearance.
IN OUR OPINION - Don't ask any more about the damn things I don't really know, I just work here........
David