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Bore Score Self Check
- Thread starter deMort
- Start date
Hi
You can buy very inexpensive inspection scopes on Ebay/Amazon these days including wireless ones. I bought one just last week.
Im pretty sure you could get a half reasonable look at the bores with one of the smaller headed models.
I bought mine to help try to track down an oil leak and have a better look inside my sill.
All the best
Berni
You can buy very inexpensive inspection scopes on Ebay/Amazon these days including wireless ones. I bought one just last week.
Im pretty sure you could get a half reasonable look at the bores with one of the smaller headed models.
I bought mine to help try to track down an oil leak and have a better look inside my sill.
All the best
Berni
bazhart
Barcelona
- Joined
- 20 May 2009
- Messages
- 1,343
A word of warning - inexperienced views of different bore scope cameras can easily mislead the viewer into conclusions that are wrong.
There is no substitute for looking first, then fully stripping and inspecting hundreds of engines - after which you can at least reliably interpret the views from your own camera (as we can).
In realist there will be very few engines that on stripping and inspecting will not have some wear somewhere on a piston and/or bore but a lot of it is not serious and the car will probably run for high mileages afterwards as it is not usually a fault that stops it working.
By now there are plenty of specialists who can read into oil consumption, tail-pipe discolouration etc to decide of a boroscope would be advised and plenty who can then advise how soon remedial action is worth considering.
Overall mileages and the wear we see on crankshaft journals is also another factor that might combine with boroscope analysis to vary the advice resulting.
As a very general rule of thumb (and prone to exceptions) crankshaft bearings are usually worn to under the white metal bearing surface in the highest wear areas (about 24 degrees after TDC) by 75K and cranks too worn to re0use after 150 K (if they are still running by then).
Early 996 3.4's with hard coated pistons usually will not bore score by 150K but cylinders will have distorted oval and be prone to cracking or "D" chunking by then unless they were exceptionally good original castings in the first place.
Later engines with plastic coated pistons are more difficult to advise about since there are 3 different causes of piston coating loss and variations in the distribution of silicon in the cylinder bores and the bonding strength.
We created our oversized engine alternatives to try and provide an incentive to consider rebuilds before so much wear and damage has taken place that the cost escalates just to get back to a reasonable starting point and many are taking up that option now. Meanwhile those engines we have rebuilt some time ago are beginning to be reported to have covered high "second life" mileages and still be running very well.
We are also not sitting on our laurels with plenty of R & D continuing and new improvements under test while machinery and equipment are constantly being upgraded to pursue the best possible quality rebuilds at the most competitive prices.
Baz
There is no substitute for looking first, then fully stripping and inspecting hundreds of engines - after which you can at least reliably interpret the views from your own camera (as we can).
In realist there will be very few engines that on stripping and inspecting will not have some wear somewhere on a piston and/or bore but a lot of it is not serious and the car will probably run for high mileages afterwards as it is not usually a fault that stops it working.
By now there are plenty of specialists who can read into oil consumption, tail-pipe discolouration etc to decide of a boroscope would be advised and plenty who can then advise how soon remedial action is worth considering.
Overall mileages and the wear we see on crankshaft journals is also another factor that might combine with boroscope analysis to vary the advice resulting.
As a very general rule of thumb (and prone to exceptions) crankshaft bearings are usually worn to under the white metal bearing surface in the highest wear areas (about 24 degrees after TDC) by 75K and cranks too worn to re0use after 150 K (if they are still running by then).
Early 996 3.4's with hard coated pistons usually will not bore score by 150K but cylinders will have distorted oval and be prone to cracking or "D" chunking by then unless they were exceptionally good original castings in the first place.
Later engines with plastic coated pistons are more difficult to advise about since there are 3 different causes of piston coating loss and variations in the distribution of silicon in the cylinder bores and the bonding strength.
We created our oversized engine alternatives to try and provide an incentive to consider rebuilds before so much wear and damage has taken place that the cost escalates just to get back to a reasonable starting point and many are taking up that option now. Meanwhile those engines we have rebuilt some time ago are beginning to be reported to have covered high "second life" mileages and still be running very well.
We are also not sitting on our laurels with plenty of R & D continuing and new improvements under test while machinery and equipment are constantly being upgraded to pursue the best possible quality rebuilds at the most competitive prices.
Baz
Can i just .. Humbly point out ..
This post is about how when changing your spark plugs you can see if you might have an issue .. ie oil deposits on x1 plug and can get it checked if needed .
A simple diy if you like .
The scope pictures i posted leave no doubt as to the problem here but they were a secondary check after the plugs were removed .
This is kind of getting Hijacked into a general purpose discussion or Publicizing a business ..
That's fine but please .. if you want that .. Make your Own Thread ...
This post is about how when changing your spark plugs you can see if you might have an issue .. ie oil deposits on x1 plug and can get it checked if needed .
A simple diy if you like .
The scope pictures i posted leave no doubt as to the problem here but they were a secondary check after the plugs were removed .
This is kind of getting Hijacked into a general purpose discussion or Publicizing a business ..
That's fine but please .. if you want that .. Make your Own Thread ...
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