Valve issues

mephisto · Jan 30, 2017

Been informed i may have issues with and inlet/exhaust valve (burnt) which needs replacing. Any idea what sort of costs im looking at from this, non stealer prices.
I guess it will be head off regrind or reseat valve cylinder head kit and refitting, no idea of parts/labour if someone could approximate? TIA

S3Alex · Jan 30, 2017

mephisto said:
Been informed i may have issues with and inlet/exhaust valve (burnt) which needs replacing. Any idea what sort of costs im looking at from this, non stealer prices.
I guess it will be head off regrind or reseat valve cylinder head kit and refitting, no idea of parts/labour if someone could approximate? TIA

You'd be best advised to replace the entire valvetrain rather than trying to salvage a mix of worn and new parts.

The approximate cost would be....

Around £1000 for Supertech inlet and exhaust valves,plus springs and retainers....I know as I've just had the same lot delivered for my car.
That's a pretty accurate estimate,and you won't find it much cheaper in terms of parts,either from the UK,or the US,where mine came from,via Integrated Engineering.

Tim Radley at Race Developments has just rebuilt the head on mine,and whilst you can get cheaper,you won't get better to do the work.

Also need to know why it's burnt a valve.....thats usually excessive cylinder temps,and your mapping may need checking.

SootySport · Jan 30, 2017

Yeh, why burnt? If they are black they may just be coked up, in which case just a clean up is required.

S3Alex · Jan 30, 2017

mephisto said:
Been informed i may have issues with and inlet/exhaust valve (burnt) which needs replacing. Any idea what sort of costs im looking at from this, non stealer prices.
I guess it will be head off regrind or reseat valve cylinder head kit and refitting, no idea of parts/labour if someone could approximate? TIA

SootySport said:
Yeh, why burnt? If they are black they may just be coked up, in which case just a clean up is required.

Coked inlet valves is a very common issue on all TFSi engines of this type,but exhaust valves obviously won't be coked.

What sort of problems have you had?.....and who told you that they needed replacing?

The price estimates I've given you are pretty much spot on,for good components and labour will be on top of that.
The head on mine was previously stripped,cleaned and rebuilt,again with about the same overall costs,but any other work such as valve seats etc will be more costly.

If you go for stock parts, @mjr901 is the man to ask for prices.

mephisto · Jan 31, 2017

Hi all thanks for your responses so far, been told an error code thrown up due to abnormal pressure in manifold. Further checks found low compression in cylinder 4 about 75psi. Said he inspected bore with camera and said it looked like valve seat damage, not sure how credible but i have had but original garage who inspected also indicated low compression on cyl 4.

SootySport · Jan 31, 2017

If the valves/seats are burnt it usually means timing is out and fuelling is very lean, not what you would expect from an ECU controlled car with knock sensors . Low compression in any cylinder can mean rings worn, valve seat recession, valve spring broke. Only way to be sure is to remove the head and check yourself.

mephisto · Feb 1, 2017

S3Alex said:
You'd be best advised to replace the entire valvetrain rather than trying to salvage a mix of worn and new parts.

The approximate cost would be....

Around £1000 for Supertech inlet and exhaust valves,plus springs and retainers....I know as I've just had the same lot delivered for my car.
That's a pretty accurate estimate,and you won't find it much cheaper in terms of parts,either from the UK,or the US,where mine came from,via Integrated Engineering.

Tim Radley at Race Developments has just rebuilt the head on mine,and whilst you can get cheaper,you won't get better to do the work.

Also need to know why it's burnt a valve.....thats usually excessive cylinder temps,and your mapping may need checking.

OK so 1000 all in thats labour and parts?

Me too, i spoke to REVO who said burnt valves would never be a remap fault, not possible apparently. Ive been told

S3Alex · Feb 1, 2017

mephisto said:
OK so 1000 all in thats labour and parts?

Me too, i spoke to REVO who said burnt valves would never be a remap fault, not possible apparently. Ive been told

That would be parts alone.

Labour on top.

Burnt valves can occur if timing and fuelling are pushed,especially with a small turbo creating high EGTs....but unlikely unless that's done.

mephisto · Feb 1, 2017

S3Alex said:
Coked inlet valves is a very common issue on all TFSi engines of this type,but exhaust valves obviously won't be coked.

What sort of problems have you had?.....and who told you that they needed replacing?

If you go for stock parts, @mjr901 is the man to ask for prices.

Error code reports with inlet manifold. And the note about low compression in one cylinder so i would of guessed this is issues with inlet valve?

Going to see if i can plugin and get the error code myself tomorrow.

S3Alex · Feb 1, 2017

mephisto said:
Error code reports with inlet manifold. And the note about low compression in one cylinder so i would of guessed this is issues with inlet valve?

Going to see if i can plugin and get the error code myself tomorrow.

It would certainly fit,but until it's been stripped down and inspected,there's no way of knowing what the problem is,and what it's going to amount to.

mjr901 was fantastic in helping me with a new head for my engine after one of the cam journals failed.

mephisto · Feb 1, 2017

Alex thankyou v much for your input here, appreciated.

mephisto · Feb 7, 2017

Ok turns out cracked piston

and apparently Audi only supply in 4 pistons con rods and rings and thats 1500 parts alone, anyone offer help here, can i get alternative from audi parts?

HHS3 · Feb 7, 2017

Sorry to hear mate, that is some real cr@p news! All I can suggest is to speak to mjr901 (Mike) on here as he's been especially great recently by helping out leshkin and S3Alex with parts, so he might be able to sort you out as well.

What error code was you getting in the end?

mephisto · Feb 7, 2017

Thanks mate yeah real ***** but there you go

the error code was in fact engine misfire in cyl4 which was why they proceeded with a wet and dry compression test. Which i guess made them assume it was rings. On removal of head i believe they found a cracked piston.
Further explanation was that the pistons in my model were superceded by Audi so the new modified piston will not fit original con rod.
I looked for mjr901 and can you believe it, he's on holiday this week!! Of all the weeks.
3k its a bitter pill to swallow, i mean im not doubting what they say but ive tried googling this and not found any issues with cracked pistons on 8p TFSI anyone care to comment?

S3Alex · Feb 7, 2017

If mjr901 can't help then I'd recommend either PEC or Integrated Engineering for complete rod and piston sets that would come in below that price for parts.

Mine has PEC rods and Wossner pistons.

mephisto · Feb 7, 2017

Okies, thanks again Alex will call them up

S3Alex · Feb 8, 2017

mephisto said:
Okies, thanks again Alex will call them up

May also be worth a call to Andy at Storm,who's just rebuilt my engine,and seeing what sort of price they could do the work for.
I can also recommend AMDTuning for an engine build.

Here's PEC's Audi page...

http://www.steelconrods.co.uk/index.php?cPath=22_28&osCsid=661bc3f5989a7a2d75adced55e2bb285

and their contact page....

http://www.steelconrods.co.uk/contact_us.php

And Integrated Engineering...

http://www.performancebyie.com/

You could also speak to Tim at Race Developments...

http://www.racedevelopments.co.uk/

He's not cheap but he builds race engines....

HHS3 · Feb 8, 2017

mephisto said:
Thanks mate yeah real ***** but there you go the error code was in fact engine misfire in cyl4 which was why they proceeded with a wet and dry compression test. Which i guess made them assume it was rings. On removal of head i believe they found a cracked piston.
Further explanation was that the pistons in my model were superceded by Audi so the new modified piston will not fit original con rod.
I looked for mjr901 and can you believe it, he's on holiday this week!! Of all the weeks.
3k its a bitter pill to swallow, i mean im not doubting what they say but ive tried googling this and not found any issues with cracked pistons on 8p TFSI anyone care to comment?

I bet mate it's a bitter blow! Hopefully mjr901 will be able to sort you out a great deal when he's back off holiday.

I haven't heard of any cracked pistons on the TFSI either, nor has a quick google revealed much on the subject but like you said, your pistons were superseded due to a bad batch of pistons and rings (with their tolerance levels) which together were affecting oil consumption. If you do indeed have a cracked piston, then finding the cause of it won't be easy and in any case getting Audi to cover the costs is a challenge but here's some information which might be of use: post #454 http://www.audi-sport.net/xf/thread...ngoing-thread-2009-2011-models.237270/page-12

kash_v · Feb 8, 2017

Maybe fit a newer engine instead with the revised pistons?

S3Alex · Feb 8, 2017

kash_v said:
Maybe fit a newer engine instead with the revised pistons?

It may well be that the existing block,with uprated pistons and rods,will be cheaper,but depends very much on what condition both are in.

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