piston damage
Turbo Mini Forums

hi i recently bought this turbo engine and have found some damage when stripping it one of the cam bearings has a big chunk out of it, the thrusts are absolutly knackered and this damage to the piston...

at first i thought i may just dress the sharp edges and use it again but i am hoping i can just buy one replacment piston and a new set of rings for all 4 its a +020 forged omega not sure on dish volume yet any ideas?
can you buy them singularly? and if so where from?
thanks lee

Speeding is like masturbating, everyone does it, but not all of us film it and put it on the internet

[quote=fab,8th Oct, 2010]fuck off

are the trusts knacked to the point of resembling blue shrapnal? im just wondering where that damage came from

Check the thust faces on the crank too. Mine were trashed.

This looks to have just the same damage as mine when I pulled it apart.

In the 13's at last!.. Just

your engine has had some bongo!

the damage to the piston is caused with detonation,
for replacement pistons ask for STEVE from MED. i doubt if he will sell you just one but you can ask ?
they will be +20" 10cc dish

as on the wanted section on here you never know your luck ?

the cause of the detonation needs adressing PRONTO! on your new engine

yes i have found tiny slithers of thrust bearing stuck to the underside of the piston crown. well and truley fooked! the crank looks to have survived its not got any hot marks on it or scoring...

i had a feeling det may have caused the prolem with the piston thanks for the diagnosis on it... i'm hoping it wa just a matter of too much boost and silly high inlt temps causing the det as i'm not running as big a turbo or as much boost as iain

Speeding is like masturbating, everyone does it, but not all of us film it and put it on the internet

[quote=fab,8th Oct, 2010]fuck off

Id try dressing it up first as long as the ring slot hasnt closed up

Paul

I seriously doubt it!

im guessing your running a grey or orange clutch cover, id oil feed the thrusts as its so simple to do. if your not confident then get force to do it. at my mates mini garage he had 2 minis a month coming in with dead thrusts due to heavy clutches

hi emailed med turns out they dont do forged pistons in 10cc dish +020 so thats interesting, are there any guides as to how to oil feed the thrusts?
thanks lee

Speeding is like masturbating, everyone does it, but not all of us film it and put it on the internet

[quote=fab,8th Oct, 2010]fuck off

yep, fastcarl invented this back in 1742 AD

Just screw them to the block and drill right through them intot he oil feed in the centre web, im in the middle of doing this right now

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=218790

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

bit of a shitter if they ain't forged as it was sold with forged pistons.

Looks like they've changed them - they are listed as a 6.5cc dish on the MED website, but it looks like an offset dish. I'm sure they used to do a 10cc forged piston.

12cc??i know they make an 18cc

As far a I know, old Omegas were 10cc. Now you can get a 6.5 offset or not and the 18cc of course. How do I know? I've got them all

so the question now is... do i use it again or not? :) anyway going to local engineers in new year armed with pictures to see if they will do the thrust mods... then i'l re asess the budget for pistons
lee

Speeding is like masturbating, everyone does it, but not all of us film it and put it on the internet

[quote=fab,8th Oct, 2010]fuck off

If the top ring slot hasnt been damaged Id use it

I seriously doubt it!

thanks for the advise paul i bought a tiny file set today to dress it will post pics when i'm happy, see what you guys think... Top ring slot has survived by the looks of things :)

Speeding is like masturbating, everyone does it, but not all of us film it and put it on the internet

[quote=fab,8th Oct, 2010]fuck off

be Assured! in my experience, if you reuse that piston it will fail in the ring lands in a short time ........... sorry to be a doubter or pi** on you parade

I stand corrected, go with the above advice

Paul

I seriously doubt it!

i have the same on my engine that i took to med and he said the ring lands would eventually let go

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for the sake of a piston are you happy to risk the whole block?

Thats the way I would look at it!

AlexF

The piston has overheated to the point that it has expanded and partialy siezed in the bore. This is most likely down to over advanced ignition, and it has not nescisarally suffered detonation. over advanced ignition is basicaly compressing an already hot and expanding gas, and when you compress a gas it heats up. The piston expands more along the pins because there is more metal in that region, so the hotter you get it, the more it expands.

I would clean that up and re use it, it looks better than one of my pistons, lol, but do make sure you get the engine correctly set up

As above ^^^Ive used pistons in similar condition with no prblems. I'd re-use it.

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1/4mile in 13.2sec @ 111 terminal on 15psi

I would agree with Carl, spocket and Matt I have seen the exact same marking on a piston I took from a race engine where trusts had failed. I dressed refitted it and have had no problams to date.