Quick question for Grant or anyone in the know

[micky1786]

Hi,

Would like to know what the 996 crank case housing is made out of?

Thanks

Edited by micky1786 on Saturday 11th March 02:49

[micky1786]

Hi,

Would like to know what the 996 crank case housing is made out of?

Thanks

Edited by micky1786 on Saturday 11th March 13:15

[SRT Hellcat]

which vehicle ? but probably aluminium will be your answer

[Wozy68]

Grant wouldn't have a clue, he's an accountant. Tobias would probs know though .

[micky1786]

Thanks guys,

I've got my answer, it's a carrera 996 fyi

[Pope]

Appreciate you have your answer but thought I would add; the chemical composition is cast into the casing

From memory it's something like AlSi9 (Fe)

Edited by Pope on Saturday 18th March 06:41

[hartech]

Just for clarity - if you are referring to Grant of Hartech - he is not an accountant. He is trained in financial management but also has been trained as a technician and spent many years working on all aspects of Porsche cars - although admittedly some years ago. He is more knowledgeable than most about all aspects of the cars and the engines hence why his advice is so appreciated by the majority.

The 996 crankcases have two constituents - a cast in core of 6 tubes of Lokasil (which is a composite of silicon and a binder creating a porous tube that when the molten aluminium is forced into the metal moulds burns off the binding agent and filters through the Lokasil tube to create a silicon rich surface only where the tubes were located I.e. the cylinders) and a commercial aluminium similar to LM25 (everywhere else making it easier to machine but unsuitable as a piston/ring wear surface).

Alusil is a high silicon alloy (in excess of 13% silicon) and it is the excess silicon that comes out of solution when hot to form evenly distributed well bonded small concentrations of silicon to provide the harder areas to resist piston ring and thrust face wear with a softer aluminium area that can be exposed back to form a microscopically cratered surface of silicon particles.

The only way to properly asses the actual 996 alloy would be to send a sample for analysis.

I am sorry that we don't often have the time to answer all the questions contributors seem to think we have a duty to whenever they ask!

Baz

[PistonBroker]

hartech said:

I am sorry that we don't often have the time to answer all the questions contributors seem to think we have a duty to whenever they ask!

Baz

Blimey, you're not trying to run a profitable business that pays employees wages and contributes to the economy are you Baz?! ;-)

[hartech]

Thanks for that - you know if I spent all the time that I presently spend on Internet answers and creating video and guides to explain about the issues with these engines - on production work instead - I could probably permanently retire! Oh but then I really would get bored!

It's been a really pleasant change this last 2 weeks designing the next Cylinder replacements for a new model and machining the prototype cylinders while our machine shop have been machining the cases - real engineering and the bit I enjoy the most still!

Baz

[micky1786]

Ouch!!!

[micky1786]

Pope said:

Appreciate you have your answer but thought I would add; the chemical composition is cast into the casing

From memory it's something like AlSi9 (Fe)

Edited by Pope on Saturday 18th March 06:41

[MrJingles705]

hartech said:

Thanks for that - you know if I spent all the time that I presently spend on Internet answers and creating video and guides to explain about the issues with these engines - on production work instead - I could probably permanently retire! Oh but then I really would get bored!

It's been a really pleasant change this last 2 weeks designing the next Cylinder replacements for a new model and machining the prototype cylinders while our machine shop have been machining the cases - real engineering and the bit I enjoy the most still!

Baz

This for the 997 DFI?