Pistons
Turbo Mini Forums

Did well on Saturday.

Got the engine out, stripped and pistons out in 6 hours. Not bad for a first timer on my own!

Anyway, what do you guys think to these?

Edited by theoneeyedlizard on 27th Oct, 2008.

In the 13's at last!.. Just

Mmmm doesnt look good. Looks like the engine sucked in some dirt at a stage.......

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"Try to take over the world!"

Also looks like the oil wasnt doing a very good job -was it very dirty or low?.
Maybe just overstressed/overheated?.

Hhmm you didnt try the old trick of porting your head by feeding it with sand did ya?

Isnt there a document on here somewhere on Piston Wear (causes)

Twas a PDF with loads of different failures in pistons and why it happend.

Maybe worth a look.

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


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I've seen worse.

You need to measure the ring lands. If these are ok, then a good clean and new rings should be possible.

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That's given me some hope Will.

I've got Joe (mini13) coming over to have a look first hand and have a measure up during the week.

I'd really like to keep them if possible as they are Avonbar Accrilites. Don't really want to fork out an other £450 just yet.

I had a look at the pdf with the images of damaged pistons and suggested causes. From that and what Joe has said. I think the damage on the sides above the rings is probably down to overheating/det.

Oil has been in perfect condition since I've had it. I've changed the head 6 times in under 100 miles and it's had fresh oil each time.

In the 13's at last!.. Just

iam afraid in my book there scrap!
the first two pics

detonation has caused this

to happy with the bleed valve Mr Ross is spot on these are scrap in my book. If they are re fitted the wil fail no Question imho.

They are scrap, but i believe the failure to be caused by overheating of the crown, the crown then grabs the bore and leaves metal behind. i say pre ignition

Scuffing on the skirt is down to metal pic up from the oil

Edited by Sprocket on 27th Oct, 2008.

Definitely looks like overheating, and looking at the crowns more than likely Det. The worst 2 look the worst, were they inners or outers, or a picture of the same piston?

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

I agree Matty. The worst 2 do in fact look the worst. lol

I will make a note of what is where and post some pics.

The top 2 images are of the same piston.

Edited by theoneeyedlizard on 27th Oct, 2008.

In the 13's at last!.. Just

Lol I meant the top 2 look the worst! One of them days!

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

It is Monday after all!

In the 13's at last!.. Just

I don't wake up properly until at least Thursday!

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

As per Sprocket and matty IMHO,

The damage is overheating, initial cause may have been detonation/pre-ignition (call it what you want) but the initial rub sheds little bits of alloy to provide all the other vertical scores.

Before you spend hours with a file trying to salvage them, or spend £hundreds replacing them, determine the root cause properly.

EDIT - Any pictures of the bores to help confirm diagnosis ???

Edited by Rod S on 27th Oct, 2008.

Schrödinger's cat - so which one am I ???

talking about buggerd pistons what do you think about this...




are they re-usable or not?

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Schrödinger's cat - so which one am I ???

You would consider using a piston with a broken skirt?

Yes there seems to be small signs of det or some thing around the top part of the pistons, as for all the scuffs along them, not sure what that is as that how mine ALWAYS are, when ever engine i've had.

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this is a good thread......... detonation is the cause here ..................

keep out off DET ...... if you here a PING! LIFT YOUR FOOT

Compression ratio, octaine, intercoller MORE CAKE!! ++.... ... is the KEY!!

do you home work guys ......its cheaper that the above

anyway, last year with the price of scrap on rebuilds, i made £25 in scrap.

The pistons which i weighd in ................ cause!
detonation ..... sad but True

Edited by BENROSS on 28th Oct, 2008.

Forget the pistons again I agree these should not go in what the hell do the bores look like

Own the day

Right

I've made a note of where the damage is on each piston and made a little diagram.

In the 13's at last!.. Just

Pot 4 was the worst and is the piston in the 1st 2 pics at the top of the thread.

In the 13's at last!.. Just

gary, pics of the bores please!

Unlucky Gary!! Hope you can get it sorted asap