Bore scoring

[Dunc355]

Hi guys

This is my first message as a newbie.
Bad news went to garage and had a borescope inspection and they came back with the dreaded news about 2 of bores have scoring marks.
Need to decide weather. A complete engine rebuild or just replace the 2 bores . As dug deep into this topic and. It only seems to happen to 1 or 2 bores is this correct ?

[Trev450]

Sorry to hear this and not the sort of thing you'd want as a topic for a first post.

Generally only one or two bores are affected and usually the right bank as it is the last to get cooled.

Contact Hartech and they will talk you through the options.

[FarQue]

As above, Hartech are recognised experts and Grant and Toby (Tobias) are easy to talk to. They'll give you all the options.

[Plu Tony M]

Dunc355 said:

Hi guys

This is my first message as a newbie.
Bad news went to garage and had a borescope inspection and they came back with the dreaded news about 2 of bores have scoring marks.
Need to decide weather. A complete engine rebuild or just replace the 2 bores . As dug deep into this topic and. It only seems to happen to 1 or 2 bores is this correct ?

Why did you have a bore inspection carried out? Did you have scoring symptoms (excessive oil consumption, sooting on near side exhaust etc.) ? Are you sure the bores are scored? I've heard of mistaken analysis of normal bore marking previously.

[wtdoom]

Bore score and seventy years ago our fathers bought forth on this continent etc etc

[Dunc355]

Reason for borescope inspection as my car seemed to be drinking a lot of coolant. So had a full service and a borescope inspection and then they showed me pictures of scored bores.

[Plu Tony M]

Dunc355 said:

Reason for borescope inspection as my car seemed to be drinking a lot of coolant. So had a full service and a borescope inspection and then they showed me pictures of scored bores.

Coolant?

[GregorFuk]

Plu Tony M said:

Dunc355 said:

Reason for borescope inspection as my car seemed to be drinking a lot of coolant. So had a full service and a borescope inspection and then they showed me pictures of scored bores.

Coolant?

Does not sound right. Not unusual for a cylinder wall to show signs of wear. Does not mean it is scored. If you did have scored bores you'd be drinking a lot of oil, not coolant. What's you oil consumption like?

[996TT02]

GregorFuk said:

Plu Tony M said:

Dunc355 said:

Reason for borescope inspection as my car seemed to be drinking a lot of coolant. So had a full service and a borescope inspection and then they showed me pictures of scored bores.

Coolant?

Does not sound right. Not unusual for a cylinder wall to show signs of wear. Does not mean it is scored. If you did have scored bores you'd be drinking a lot of oil, not coolant. What's you oil consumption like?

I'm assuming the coolant problem was incidental and the full service/inspection then revealed the unrelated existent or otherwise bore issue.

[Dunc355]

First I was told all bores were scored then I showed another independent garage the pictures and they said only 2 are showing heavy scoring marks.
But the car drives fine.
I know Hartech carry out rebuilds is their any other highly recommended garages ?

[DanoS4]

Is it -

1. losing OIL
2. tapping - noticeable from 800rpm
3. Is there soot on the left-hand pipe


If not, get another opinion imho.

My 996 had bore score, and had all these symptoms, but NO loss in performance.

If you can, get it to Grant & Baz @ Hartech - even for the once-over.

Dan

[Trev450]

Dunc355 said:

First I was told all bores were scored then I showed another independent garage the pictures and they said only 2 are showing heavy scoring marks.
But the car drives fine.
I know Hartech carry out rebuilds is their any other highly recommended garages ?

Autofarm are also highly respected but adopt a slightly different approach to the problem than Hartech, insomuch as they use steel liners (less expensive).

[monthefish]

Dunc355 said:

First I was told all bores were scored then I showed another independent garage the pictures and they said only 2 are showing heavy scoring marks.
But the car drives fine.
I know Hartech carry out rebuilds is their any other highly recommended garages ?

I've personally had positive dealings with Hartech and would recommend them, but another option is Autofarm.

[Dunc355]

Yes spoke to both at the moment speaking. To RPM technic
Any ideas anyone ?

[mollytherocker]

The only other real option is a second hand engine.

Probably cheaper but risky of course.

[alfaspiderman2]

DanoS4 said:

Is it -

1. losing OIL
2. tapping - noticeable from 800rpm
3. Is there soot on the left-hand pipe

Mine is:

1. using about 1 litre per 1300 miles
2. not tapping
3. sooting the left tail pipes somewhat more than the right

Does that spell trouble?

[DanoS4]

Would certainly benefit from someone looking at it imho.

Hope I'm wrong.

[anonymous-user]

alfaspiderman2 said:

Mine is:

1. using about 1 litre per 1300 miles
2. not tapping
3. sooting the left tail pipes somewhat more than the right

Does that spell trouble?

That is how mine started - at 4500 miles! Took OPC a further 3000 miles and a number of "fixes" (such as changing oil separator) before they got the bore scope out. By which time consumption and sooting of n/s pipe was worse. Mine never made a noise. They then tried to fob me off with a dealer rebuild (at 7500 miles and a year old). I held out for new engine. Porsche refused. Dealer made up the difference to get the new engine. Not that I am bitter or anything ;-)

[R26Andy]

How noticeable is the additional soot on the nearside tailpipe? Both mine have soot on after 80k miles. No oil consumption in last 1000 miles, no tapping noises either.

[Shurv]

If it's only losing coolant, it may be your plastic header tank, they split over time. Get another opinion and make your decision from there.