looks like head gasket failuer more than poor mapping?


Though i am pissed so who knows

 

not good

 

opps just noticed the piston too

But how come u had greys etc. with out cut outs in the piston?

What bhp was u running?

 

just trying to load up more pics to show the full dammage

 

looks like sum stupid amount of bore wash going on there in number 2

or have you cleaned the piston


number 1 doesnt look to hot either but why is it that black compared t the otheres and the bore doesnt look to good


but id say get it live mapped nxt time

but everyone learns from there mistakes

 

thats my 3rd in 2yrs 4x4rs and yes had cleaned the piston to see the extent off the damage but only just found out that it was a wire rung block and had a cometic head gasket on plus was surposed to be low comp but there is not alot took of the tops in my opinion

 

RHYS apharently it had a 7.2:1 low comp pistons but looking at a set of 7.5:1 pistons today has not ,28psi of boost on greys on near standard compression no wonder it would not run right

 

Erm... are you sure it was a steel gasket?

 

so whats the problem with that ??? i runmore boost and more compression than std, teh problem with that is that it wasnt setup to do what you were doing with it

 

i used to run 25psi on greens and a completely standard engine bar grp a head gasket



got cained everyday and no problems

set up properly you wont have any problems

 

That piston has done that due to either oil contamination causing det, or through too much advance or through not enough fuel.

Too much advance or not enough fuel are mapping issues.
oil rings failing due to bore wash and allowing oil past is a mapping issue if thats killed it
head gasket overheating and allowing oil to leak into the chambers could well be a mapping issue too

So whatever the reason for failure, there is a high chance a decent map could have saved it, either that or its just tht the engine is worn out through too many miles.

 

On this very subject, ive a car in right now that reminds me 100% why i refuse to do greys OTS.

This car is running greys, T34, 7.4:1 and a BD14.

At cruise.. 4th gear and 40mph its running 8.09:1

At cruise.. 80mph 5th gear its running 8.56:1

On boost, 28Psi above 5500rpm, its running lean at 13.6:1
It melted the same day he bought it or very soon after as i recall?

It cost the fella approx.. wait for it...



Ł250 in fuel to get it here approx 500Miles!! Thats 2miles per Ł1

This engine is faultless and ive spent an hour on it datalogging the outputs.. its a pure mapping fault. Its rich everywhere but where it matters

 

look at it this way stu , at least when he leaves with his car - he's gonna fookin love you

 

yes Stu the block was wire rung and it had a cometic multi-layer gasket on which inow understand is a big no no ,i did not know as this engine was built for me after the one before had blown it had never been right and i now know why

 

If it was built and mapped properly the cometic would have been fine.
Providing the surfaces are flat they work really well.

 

Not with wire rings it wouldnt chip, the rings cannot bite into the steel properly to serve their intended purpose.

 

but on a wire rung block understand they conflict each others purpose ?

 

The cometic appear to be unreliable and aint ya surposed to use a diff gasket for coopers rings ?

 

Yeah without the rings, like i said "providing the surfaces are flat"
You cant get much less flat than little rings poking out of them!

 

Wire rings are different from Coppers rings are they not??

 

so would the fact that a cometic gasket was used over a wire rung block have caulsed the head to pit and melt away as in pic 2 ?

 

there is nothing wrong with cometic gaskets if fitted properly.

and that block in the pics isnt coopers rings its just machined to take mig wire.

 

never said it was cooper ring s ian that was mentioned later in the topic

 

i know you didnt but dingy said they where.

 

coopers rings are different to just wire ringing with mig.

NEITHER should be used with a cometic MLS gasket though.

 

Yep, one of them works if done properly, the other is just leaky shite (imo)

 

 

Where is the car now neil at steves again ?

I am so gutted for you to have another go.

Havent seen it since germany and it was running ok then and pretty dam quick.

Will be at next meet as dont do nights no more

Then off to kill me and chip at the ring end of may you have got me addicted

 

LOL@Markk

@ guys engine, time to seek advice from a different tuner.........

 

no not going to take it back how many times do i have to have it done to be right ,it was not even running right at germany was only using low boost and it seems to be a compression issue +wrong gasket on fire rung block +bad advice this engine is totally fucked not just a set of pistons mate

 

Your gasket failed due to wrong one...keep the block and use a std head gasket...proper sorted Probably blew on that cylinder cause it to run lean as all other pistons look mint (so not mapping)

Greys dont need to be mapped imo...i had a collins chip for greys and a did the AFR and ok had a 7% co at idle but once running was very good imo flat out in 4th holding around 10.9 which to be fair on an off the shelf chip pretty good

If you was running a lo comp chip in a higher comp engine then it would be very safe due to less ignition advance used....infact you could have run it on 80 ron fuel

 

ahaaaaa the master has spoken

 

is it advised to use greys then or not!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

Greys are fine and Dandy.. done correctly, as are 8 or them for that matter.

 

phil, your dreaming if you think theres less advance in a low comp chip quite the opposite infact unless you go to paul hills.

 

Sorry wrong way round

 

so i wasnt just me that noticed then

 

Phil,

I thought there was more ignition advance in the lower CR chips to account for the drop in CR?

 

Doh! Too late!!