61 replies to this topic

[DukeNik'em]

Sleeves don't lower the friction.
How the hell did you come to that conclusion? .

Well the sleeves are usually composed of a metal with lower friction than the block's metal. So one would think the friction would be less, and of course the less friction the lower the kinetic heat.

Nick

[Soop]

They're usually steel IIRC. And they're still bored out and honed to created a surface that is suitable to let the rings seal and do their job. So no, they don't provide less friction.

[WillC]

So guys... We've established that the Lib B4 EJ20TT has. - Open Deck - Factory forgies. My next question would be what would be the likely hood of the ports to crack :| as soop said... makes me think these engines are quite fragile

[Jeff]

Big End failure is prolly the most common misfortune on our "fragile" B4 engines without a tune or an over aggressive tune. Yours should be fine though as its a KoSTI-Tek tune Edit: Brain fart

[Soop]

Ports are the bits that lead the intake to the valve, and the exhaust to the exhaust manifold mate. Are you talking about the cylinders cracking? You won't have an issue with them cracking though mate, as Jeff said. Pinging will kill it before you split a bore. EJ's are made from butter though dude.

[WillC]

Ports are the bits that lead the intake to the valve, and the exhaust to the exhaust manifold mate.
Are you talking about the cylinders cracking?

You won't have an issue with them cracking though mate, as Jeff said. Pinging will kill it before you split a bore.

EJ's are made from butter though dude.

Oh yah those things : ) told ya i was a noob.

thanks for the reassurance guys : ). I was just worried about Dylans stories of how he was just driving along and gave it a bit a blew his engine sideways ....

[Jeff]

No matter what the engine is and what modifications have been done to it.... if any...... there is still a risk of engine failure... regular maintance is the best prevention of anything going wrong next to not driving it at all lol

[Soop]

Dylan wasn't educated enough at that time to diagnose a blown head gasket. It essentially run the engine dry of oil and spun a bearing. He continued to drive it not know the severity of the damage being done, untill the piston managed to slap the bottom of the block (I presume anyway) and smash the piston skirt, the movement also mangled the rings and bore.

[DukeNik'em]

Subaru Boxer's, when given care and attention, will last forever, it's just misinformed modifications that will shorten the life span. And irresponsible/reckless driving. Nick

[Soop]

No they won't. Forged engines will always have a limited lifespan, given its gotten alot better over the last decade. Forged pistons expand when hot. Therefor they need to be smaller when cold. During the time it takes to heat up and expand the pistons bounce of the cylinder walls. Which DOES damage the bores and the rings. The will last quiet a few years, but certainly not for ever.

[Jeff]

Subaru Boxer's, when given care and attention, will last forever, it's just misinformed modifications that will shorten the life span. And irresponsible/reckless driving.

Nick

Agreed

[Richo]

piston slap (or what ever its called) sounds cool

[B4TT]

About the cracking.. well the heads crack around the valves.. I have had it happen . with a decent oil the amount of damage done to the bore with forgies is pretty minor, look after it properly and there is a good chance it will last as long as any other engine. Tis also a very good idea to let the engine run a while before you out load on the engine (when its starting from completely cold) let everything heat up and pistons expand etc.

[XXB4XX]

Will, you have woken subyclub!, all the boys are right and wrong as it's all very opinionated, jeff knows his shit, The Standard b4 tune was the death of these cars, ej's are not that weak at all, as there are some big ass boxers out there. Change oil every 5-7k like I did, use Only 98 ron! And you'll be sweet, oh and don't, I repeat don't! Give it a hard time on hot days, as with all turbo cars, it's a recipe for disaster. Correct me if I'm wrong, I believe the b4 had sti internals?

[B4TT]

I think you may be right, although I dont think the cams are as aggressive as STi ones.. then again its for a completely different turbo system. Most of them do have the 550cc STi Injectorz but (pink)

[WillC]

heh didn't mean to rock the boat... : ) just had an honest question and couldn't find the answer on the google! and the people i talk to just said .. its a strong engine... Cheers Guys Will C : )

[XXB4XX]

it's a good thing will, your asking good questions a mate

[Jeff]

Will, you have woken subyclub!............ jeff knows his shit.

Awwwwwwww Thanx Brenda, that makes me all warm and fuzzy inside.

[Soop]

Get a FMIC ffs. TMIC are shite for driving in traffic. Regardless of how "Speshal" they are. You'll have far less issues with heat soak.

[ams]

Get a FMIC ffs.

If I didnt spend so much on a new tmic and given my time again, i would have gone front mount...

Uhh...what I meant to say was that Will - if you want to buy a near new bolt-up Hyperflow TMIC for your silver sovereign, uhh...damn.

(yes soop, shuddup...)