Do all 997 have bore scoring?
Bore scoring isn’t a problem for the direct fuel injection engines of the second generation Porsche 997 or for the first generation Turbos and GT models. With the first generation flat-six engines, it is most likely to occur on the 3.8 but is rare on the 3.6.
What causes bore scoring Porsche?
A lack of cylinder & piston lubrication is the major cause of wear or bore scoring. The minimum grade gasoline for all street production Porsches is 91 octane. A rich mixture can wash the oil off your cylinder walls, so by driving off immediately you will help burn more of the excess fuel.
What does bore scoring mean?
We believe scoring occurs when small (but larger than previously) particles of silicon break free from the surface of the cylinder bore and become trapped between the piston and the cylinder bore, rubbing up and down between them until they either escape from the top or bottom of the piston to be taken away with the …
Why is bore scoring bad?
Wear debris from the scored bores is very hard, and abrasive. As the cylinders lose ring seal, due to the bore scoring, harmful fuel contaminates the oil as it bypasses the piston rings. This fuel enters the engine oil, thus reducing oil viscosity as it intrudes into the oil.
What causes scoring on cylinder walls?
In general, scoring of the cylinder wall and piston skirt first presents itself as scuffing that then, over time, leads to scoring. There are a number of main reasons for this to occur which include: Poor fit of piston to bore. Poor oiling of the bore from a failed or stuck ring.
Is a Porsche 997 A Good Investment?
The 997 is a great all-rounder that represents excellent value for money. Moreover, it can be driven any day of the year, and that will get you into the prestigious 911 club for an affordable price.
Is cylinder wall scoring bad?
If the cylinder walls are scored it will definitely effect the compression. If you haven’t already, do a compression test. If the rings are leaking it is allowing gasses from the combustion chamber (top side of the piston) into the crankcase. It is probably burning oil too.
Does honing a cylinder make it bigger?
The problem lies in the process of honing, where if a little does a good job, certainly a few more strokes to make it better looking can’t hurt anything. When I hone a block, each cylinder sees between 4 and 6 strokes, no less, no more. That will increase the bore size between .
Is there a problem with bore scoring on a Porsche 996?
There are many articles online and various posts in Porsche forums about bore scoring issues and engine failure! While cylinder bore scoring has been an issue on a relatively small percentage of 996 and 997 models, it isn’t a universal problem. How does bore scoring happen?
What causes wear and scoring on a Porsche engine?
This raw fuel mixture can wash the oil off your cylinder walls which in turn will cause a lack of cylinder & piston lubrication. A lack of cylinder & piston lubrication is the major cause of wear or bore scoring. The minimum grade gasoline for all street production Porsches is 91 octane.
Is the Porsche 997 Gen 2 a good car?
The failure itself didn’t match up the Gen 1 problems and it is nowhere near as widespread. It would be foolish to try to explain the cause, but we may find out eventually when Indies start fixing them. If you want a 997 then I’d still suggest Gen 2. It’s a great car and the vast majority don’t have engine problems. Gen2 is vastly improved.
What causes a Porsche bore to get scarring?
Once the protective cylinder lining is damaged, the cylinder is in direct contact will the wall which causes scarring. In addition, lubrication of the cylinders is also compromised by a two year oil change interval.
