big end

[wrxboy]

i have a slight knock from my engine, only heard when you listen under bonnet closly. ive been told its the big end bearing on its way out by the garage ??

im going to take to another to get a second opinion

im sure its done it for 1 and a half years so if it was a big end wouldnt it of gone bang already??

[boon]

Unless they're Subaru specialists I wouldn't get overly worried right away. All subarus make a variety of individual and unique noises

Could be a little bit of piston slap... does it go away when it's warm?

[wrxboy]

There is one guy that works there that was a subi specialist so I'm guessing he looked at it? They said they could hear it when it was warm but I had a listen and I couldnt, but you can when it's warming up. I just want to make sure it is that before I start saving for a rebuild.

[Timmah]

You should youtube big end to give yourself an idea of what it sounds like. It's a very noticeable noise.

[WRXONP]

Big ends are loud . And a big end will all ways be knocking ... . The more revs the louder with a big end . . Easy way to tell if its piston slap is it normally will make the noise up until around 2500 to 3000 . . So rev it up under the hood and take revs up and see if it goes away . . . . Other thing is if your engine has hydraulic lifters then you might be hearing them

[rex-leggy]

either way should still save for a failure you own a subaru after all .

but seriously with any car i could happen

[WRXONP]

Piston slaps pretty normal on a old worn motor

[wrxboy]

I've also been told that if the big end is on it's way out then the rings will probaly be screwed aswell?Is that correct?

[WRXONP]

The big end cant really be on its way out. Its either stuffed or not . . . . . Some may say other wise but realisticly its when the big end spins in the rod . . . When it starts going . It doesnt take long to be fully farkeed

[Guest]

i sketch out sometimes on those hydrolic lifters.they sound shit at night.best option man dont rebuld you motor.get your self a possum bourne short block.they sell 2 types.one thats forged and one thats not,price vairys.get you head reconditiond and youl be sweet.the blocks thy sell come under warrenty so youl be safe.

itl probly end up costing you about 6k.

[boon]

 sti8u said:

i sketch out sometimes on those hydrolic lifters.they sound s*** at night.best option man dont rebuld you motor.get your self a possum bourne short block.they sell 2 types.one thats forged and one thats not,price vairys.get you head reconditiond and youl be sweet.the blocks thy sell come under warrenty so youl be safe.

itl probly end up costing you about 6k.

Maybe a good option if he wants to build a 500hp motor but if it turns out the big end IS shagged it's way cheaper just to buy a front cut or some random un-opened long block off tardme... $6k, jesus I could probably replace my EJ207 for that.

[funkytown]

i have an factory ej207 going for half that loom, turbo and ecu as well

[WRXONP]

Shit yea . In my opinion those possum bourne motors are well over priced . . . But thats because im a mechanic and never pay labour to no one ha ha ..

[Guest]

 WRXONP said:

s*** yea . In my opinion those possum bourne motors are well over priced . . . But thats because im a mechanic and never pay labour to no one ha ha ..

haha but are you trade qulifiyed?if you bild the motor and it fuks out its your problm to fix it again

once again it come down to do it once do it right.i only used possum borne as a example cause i was fully satisfyed with what they did wth my car.the forged short block in on 3900$ the other ej20 is only about 2000$ or something like that

[WRXONP]

Mate im trade qualified and certified for a whole bunch of things . . Personally id have allot more faith in a motor ive built then one some one else built . . . But thats me down to a T . I do all my own work . Every ones different and not everyone can build a motor . . . So thats where the know how is an advantage . . . . Yes buying a motor you get a warrenty for piece of mind . But if its built properly it shouldn't need a warrenty unless you do stupid shit to it like detonation or running lean etc

[WRXONP]

But for the price of a possum bourne motor I could build a few motors any way

[Guest]

gues it depends then.for me id rather have the peice of mind and pay for the short block.

so im guessing youv done apprenticeshps ect?

[WRXONP]

Yeap apprenticeship . Tec courses . Cert assessments etc jack of all trades I like to think lol

[DRFVDR]

 WRXONP said:

Yeap apprenticeship . Tec courses . Cert assessments etc jack of all trades I like to think lol

You do know that old saying dont you

Jack of all trades, Master of none

[Guest]

 DRFVDR']

[quote name='WRXONP said:

Yeap apprenticeship . Tec courses . Cert assessments etc jack of all trades I like to think lol

/quote]

You do know that old saying dont you

Jack of all trades, Master of none

;D

[wrxboy]

so if a big end goes fast mine wouldnt be that?? im sure its done it for a long while.

[Guest]

hava closer listen bro.if it down by your cambelt it could be something diffrent.

[WRXONP]

Ha ha cheeky guy aye . . . I like to think that any way . . . But some noises that people think are big end can turn out to be failed cam belt tensioner . Noisy hydraulic lifters. Piston slap . . Normally a big end will take a matter of seconds to go from being quiet to being crazy loud . . . . . Take revs up with you under the bonnet and see if your noise goes away after around 3k . . . Thats normally a "common" subaru piston slap

[Guest]

 WRXONP said:

Ha ha cheeky guy aye . . . I like to think that any way . . . But some noises that people think are big end can turn out to be failed cam belt tensioner . Noisy hydraulic lifters. Piston slap . . Normally a big end will take a matter of seconds to go from being quiet to being crazy loud . . . . . Take revs up with you under the bonnet and see if your noise goes away after around 3k . . . Thats normally a "common" subaru piston slap

yeh what he said.what is piston slap.like i know what it is kinda.but what is the piston 'slapping'?lol

[WRXONP]

It means the tolerance between the piston and bore is too great and the piston is rocking in the bore . . . . It normally happens when cold with forged pistons as forged pistons need quite a large tolerance (compared to a cast piston) to allow for expansion of the piston. In my opinion . Piston slap when cold is not really an issue. Piston slap when hot means she must be pretty worn in the bores .