All Things Mk5 > How to Guides / Troubleshooting
Cylinder Bore Scoring
Octoparrot:
--- Quote from: bobby_fodge on January 30, 2023, 06:29:40 pm ---Could break your car to get some money back and get another car?
--- End quote ---
Unfortunately that's probably the most economic / sensible / likely outcome unless the car is absolutely mint otherwise.
rhyseyness:
The car is by no means absolutely mint, but I've been working towards getting it that way. One day it will be if I can get it through this!
The most financially sensible decision would definitely be to sell it in parts or otherwise, but I'd much rather keep the car.
It holds sentimental value!
I'd like to bring it back to full working order with effectively a "new" engine.
If I can do this, I wouldn't be selling the car for many many years, so I don't mind spending the money.
I've done a massive amount of work on the car already so don't want to start from 0 again, so to speak.
bobby_fodge:
If you are looking at these two options,
Anyone know of a good shop to supply/fit a new engine for me?
I'm assuming that's more cost effective than having this engine re-bored, head repaired and rebuilt.
I'd start by getting some prices for an engine rebuild and also quotes to refit it. I'd look at engine builders to do the engine and a garage to just fit it. It may be slightly more hassle but you'll then get the choice of which builder sorts you engine and won't have to pay the profit a garage would charge extra to get the engine built for you.
A call to VW will get you the cost of a new block and valves and whatever else you need.
Once you have all those prices you'll be better placed to make a decision on which option to take.
pudding:
Scratches like that normally happen from overheating. The piston ring gaps close up and they have no where to go except up or down, which breaks the ring lands, or expand outwards, which scratches the bore.....or a combination of the two. Pretty common on remapped engines (most folk don't realise they are driving around with broken pistons until it starts smoking badly) but it never happens on standard engine unless cooling issues occur and it over heats.
Sorry to see this btw, always a gutting experience seeing a paper weight of a block after lifting the head. It isn't recoverable financially as you'll need oversized pistons and the machine work to suit, which is mega money.
I think chancing a second hand engine is the most cost effective way forward. Rebuilds and/or new blocks from VW are easily around the £3K mark.
rhyseyness:
--- Quote from: Pudding on February 01, 2023, 10:38:23 am ---Scratches like that normally happen from overheating. The piston ring gaps close up and they have no where to go except up or down, which breaks the ring lands, or expand outwards, which scratches the bore.....or a combination of the two. Pretty common on remapped engines (most folk don't realise they are driving around with broken pistons until it starts smoking badly) but it never happens on standard engine unless cooling issues occur and it over heats.
Sorry to see this btw, always a gutting experience seeing a paper weight of a block after lifting the head. It isn't recoverable financially as you'll need oversized pistons and the machine work to suit, which is mega money.
I think chancing a second hand engine is the most cost effective way forward. Rebuilds and/or new blocks from VW are easily around the £3K mark.
--- End quote ---
As far as I know car isn't and has never been mapped, but that is very interesting as I had an overheating issue previously due to dead radiator fans, so could well have been the cause!
Thanks for the info, very good to know.
I've had a ballpark quote from AKS for a full forged rebuild with rebore and they reckon about £5.5k.
As you say, mega money, and even if I did have that laying around, they're not taking bookings at the moment.
They've recommended a couple of other garages who I'll contact and see what they reckon.
I'm leaning towards a reconditioned engine from "volksmine" which looks like it'll be about £2.5k for the engine plus all the other bits (seals, fluids, cam follower etc.) bringing it up to just over 3k.
Obvious downside is that I'll have to do all the work myself.
Still not cheap, but that's near enough a brand new engine which seems worth it to me.
https://www.volksmine.co.uk/audi-a3tt-20-petrol-200-bhp-4-cylinder-bwa-re-con-engine-166-p.asp
Anyone with first hand experience of this company would be massively valuable!
Was probably the worst I've ever felt about my car when I saw the scoring after lifting the head.
It put my brand new clutch slipping immediately after I put it in last year to shame! (Since replaced with a Helix performance one)
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