well some of you mite know a couple of weeks ago i took my saff to AVA to get set up as i had rebuilt the engine etc. all was well untill the last run on rollers the suddenly lost power and car cut out

Got the car started about 20mins later when cooled down but engine was knocking like fook again but as i was 220 mile from home i had to drive it got me home ok ish lol. So today i decided to strip the engine down to have a look and found this





so it looks like my problem is a melted piston first time ive melted a piston on a cossie in 10 year

 

that be poor fueling at a guess!

 

So what was the AFR like ??

 

nasty mate

 

surely its impossible to tell what the original failure is if you drove it 220 miles until it seized?

there is no way that det was missed while on the rollers...

 

according to alan at ava the fueling etc was spot on the injectors were brand new also

he didnt tell me what the afr was

 

it didnt seize at all euan even after the 200 mile trip home still started up the next day was just knocking like fook

 

was it number 4 piston

 

whats the crank like?

 

no mate was the dreaded number 3

euan crank is fine but oil pump is scored to fook inside

 

bet it was no 3.

 

Bad luck Dicko, was reading your thread a few months ago when you had your top end knock.....

 

Doesn't really look like det has caused that (although det has been present for a breif period). It looks more like the engine was over heating and the piston has nipped up in the bore before freeing itself off as it cooled down (hence the 20 minute delay before it would start again).

It could be that the det has been mild enough for it just to heat the piston up enough for it to expand and grip in the bore.

 

There are signs of det but no melting.

Looks more like oil starvation to me..... ????

 

do you run a oil pressure gauge?

If so was the oil pressure ok?

 

Dazc

so what would of caused that any idea?

 

yes mate but it wasnt wired up as sender unit was fooked i thought faulty oil pump at first tbh

 

surely cant be det as they would of picked it up that she was running lean on the previos r/r runs??

 

mapping error could be 1 too much ignition or 2 fuel starvation not a dig at any one

 

wasnt getting mapped mate just a set up etc to make sure was running ok guess it wasnt pmsl

 

I blame the engine builder!


Only Kiddin Lee...shame was a lovelly car

 

Dicko&Sarah
well ither way it ran lean to a point it was melting the piston dosnt have to have been at the rollers could have been a few weeks before that and just melted through

 

It hasnt melted....

 

When a car is on the rollers at AVA there is always a head under the bonnet and a probe up the exhaust.

There is no way lean running or det could have been missed.

the scored oil pump could have been giving low oil press and caused what DazC said.

 

That's fuelling or ignition simple as......... and it was on AVA's rollers for a setup??? I would be having words I have to say....

What were other pistons like?

 

it has melted but not first degree

 

looks like it got bloody hot to me

 

God unlucky mate at this time of year too

really hate putting my car on the rollers, always seems sore for it because you are right there next to it

whats the plans then, big power build?

 

cars being broke up for spares

 

rab check parts for sale pmal its in a thousand pieces already

 

Was it knocking all the way home bud? Did it get any better or worse?

 

yeah it was lol i asked alan if it would get me home he said only one way to find out pmsl

it got worse but not that much

 

I think i would just joined the AA mate, probably cost less than i did in fuel to get it back anyway lol.

Proper gutted for you though

 

Annoying thing was sarah is in the AA but as she wasnt in the car they wouldnt come out

only cost Ł60 in fuel, to join the AA you have to wait 24hrs before you can use it

 

why not use someone elses AA card ?

tbh if you got in contact with anyone on here they would have gave the details to you,,, i know i would of as since i bought the BMW ive called them out once in 18 months

id say its what DazC says,,,, not just cause hes one of the smartest people on this forum who keeps quiet about it,,, but because oil also cools the engine and cossies doing top speed runs with normal sumps have been known to help them melt on motorways ect racing bikes ect

 

she could have added you to the AA policy and paied a premium based on being her car blah blah and she forgot to add her other half on the policy if that makes sence

but thats pointless now as the cars in bits

 

who built that engine?

 

thanks for that mate, if i had thought in advance id have done that

 

myself, whats that got to do with anything?

 

oil spray bar blocked mate??? ?