Arias Pistons

[proengines]

Going off that first picture I'd be 99% sure it's had a gudgeon pin come out and been running against the bore. Do you have any closer up photos?

[BOOSTD]

Here are some more pix.

The gudgeon pins were all siezed to the rods instead of being floating like they are supposed to be. The failure was not due to any fault in the piston but the stupidity of the engine builder.

Edited by Blitz

Sorry to hear about your woes Matt, but for legal reasons we cant allow businesses to be slandered on this forum, justified or not

Edited August 18, 2005 by Blitz

[Beer Baron]

bummer. can i ask what it was they did wrong? in the second pic it seems as if there is still a circlip poking out?

[discopotato03]

I'm no expert engine builder but I have seen gudgeon pins walk out and run on the cylinder walls . Generally the locating circlip (sp ?) has failed and no longer locates the gudgeon pin . I'm told Spiral locks never fail if fitted properly , may be worth a look .

Cheers A .

[BOOSTD]

The spiral locks didn't cause the failure. The gudgeon pin as I said was not floating on the rod causing the spiral locks be to simply smashed out. I also have 2 bent rods....

the spiral lock on number six was a bee's arse from coming all the way out also.

The gudgeon pin should fit into rod with only palm force and slide along the length....these are all rock soild.

Edited August 18, 2005 by BOOSTD

[Cubes]

Is it looking like one of those 'shit happens' moments or is it related to the assembly?

[BOOSTD]

100% assembly unfortunately

[B33st]

Well i'm glad the pistons are not at fault as my build using venoila is just about complete. This thread was starting to worry me with all the negative talk about their pistons.

leigh.

[BOOSTD]

No worries leigh, I'm also glad to report .0025" piston to wall/bore didn't cause any issues either

[B33st]

I've kept mine to .004", didn't want to go to tight.

[datsqik]

Ive built quite a few engines over the years and have found that i usually have to hone at least one conrod per build as they have been to tight.The last motor i recieved for rebuilding was a freshly built sr20 with hks pistons that started making death rattle noises.I thought for sure i would find at least one tight little end but ended up being tight piston to bore clearance (1 thou).Made a mess of one piston and bore and the others looked like they were ready to grab and tear.Had a lot of wear on the skirts for a motor that had only done a few hours work.

[proengines]

That's a really odd failure. The small end clearance is only .0002-4" which is really just enough for the pin to push through with light thumb pressure. How long did the engine run before this happened?

It's strange for there to be enough side load on the pin to force the side of the piston out, even with the pins seized in the rod.

Any decent engine shop will warranty their work though, have you spoken to the shop yet?

[BOOSTD]

The engine lasted 300km.

Side load was magnified by my rods being bent from the siezed pin.

The shop sent me packing with only an oil leak warrenty after trying to over charge me. The response was, "you didn't get a written quote so I can charge what I like" I am letting the authorities assist me in the right process for compensation.

[Blitz]

The engine lasted 300km.

Side load was magnified by my rods being bent from the siezed pin.

The shop sent me packing with only an oil leak warrenty after trying to over charge me. The response was, "you didn't get a written quote so I can charge what I like" I am letting the authorities assist me in the right process for compensation.

Thats bullshit! Best of luck with it all Matt - hopefully the car is sorted soon.

[BOOSTD]

Thanks Blitz, no worries with the edit. I'm sure if anyone wants more info they will pm me.

The Block and head are at ADVAN now. Will be fitted with CP 87mm pistons and new rods. So far ADVAN have been extremmely helpfull.

[Bl4cK32]

That warranty is bs.

Ive been through consumer affairs before, and it states if you dont get what you pay for, you are entitled to a refund...

ie if you pay $200 for a watch, you expect it to last / work properly...

Ring consumer affairs, and tell em your motor lasted 300km's..you will have a case for a refund, as no one expects a motor to die after that short of a time.

Good luck

[ido09s]

this picture does not do the damage justice the bit you cant see is the depth of the score, i was quite disturbed when i saw it.... but, we will sort you out and get you back on the road ASAP!!!!!

http://www.skylinesaustralia.com/forums/in...pe=post&id=1538

[BOOSTD]

ido09s..do you work at advan? =)

[druzilla32]

hopefully these pistons serve me well.

the new motor should be going in about 3 weeks. i will let you know how it all goes

[proengines]

hopefully these pistons serve me well.

the new motor should be going in about 3 weeks. i will let you know how it all goes

<{POST_SNAPBACK}>

Just a tip, have a very close look during assembly at the clearance between the oil squirter and the side of the piston, if you move the piston from front to rear in the bore you will see they run very close. We modify the locating lug on the squirter slightly to move the squirter away from the piston.