Hi,
Since the 2010 GT3 uses steel cylinder liners, what are the pros and cons of using the steel liners vs aluminum?
I know the new steel liners are weighing 7.7 pounds more than the previous version.
What are the reliability concerns about using steel liners?
Many Thanks.

 

I have a feeling the steel liners are a result of going to 3.8 ltr's. Probably a issue of thinner cyl walls needing more strength. IMO.

Peter

 

^^^ From what I read that is definately the reason why. With exception to the added weight, I am unaware of any potential reliability issues. I would also imagine that steel liners would actually be more reliable; not that there are any concerns whatsoever with the aluminum ones. Steel liners have the potential for better sealing properties under extreme conditions. (Again, I am NOT saying that any aluminum liner GT3 engine or other models have sealing issues.) Porsche also eliminated weight elsewhere; flywheel, exhaust for example, to compensate for the added weight. I believe they actually reduced the overall weight in the back.

 

Is Porsche still using the same GT1 derived block they've been using for the GT2/GT3 & turbo cars for the last several years?? Or, did they discontinue that idea, and simply go with a high performance version of the new direct injection engine that is in the regular production cars?

 

+1 on the added strength of the steel liners. due to the 3.8l motor, they opted for the same liners used in the cup/rsr motors of that size.

 

Only the current GT3/RS has the venerable GT1 block. The GT2 is the only wild card, however, I would very much imagine that that will follow the current wet sump(AKA integrated dry sump) DI turbo engine.

 

I wonder how they deal with the problem of corrosion at the aluminum block to steel liner interface. If the two dissimilar materials are allowed to touch, there will be corrosion.

 

Steel liners have been the only way to go for the high powered 996tt motors for several years now.

The steel liners are much stronger.

 

Cylinder liners are not aluminum....
Gen1 used cast iron liners
Gen2 uses steel liners