Horses from a new crankshaft?

[Ganja Porsche]

Do they make 'performance' crankshafts or anything of that such?
I have an 83 944 and have my engine torn down. I'm going to make it best as possible when I put it back together... Could using a 968 crank or something gimme more horses?

[Britwrench]

Well, firstly, as used engines are so cheap I'm just wondering why you are bothering to rebuild yours?

Numerous modifications are possible, the only limiting factor is your budget. Obviously, the rest of the car is still nearly 20 years old......

2.8 engines are possible, figure about $10000 upwards..

[Pilot_951S]

You could have your stock crank lightened, knife edged and balanced. Of course this begs the question if you are going to spend your money on upgrades, why not go 2.8?

A 968 crank will not simply bolt in, you'll need new pistons with a different wrist pin location, new rods, and some block clearancing.
10-12,000 is about right for a proffesional rebuild.

[Mike B]

Hi Craig...I thought you were going to buy a toyota or something...and whats up with the Ganja Porsche name...

and Porsche crankshafts are over-engineered...You can improve them as listed in the previous posts but when is the last time you ever heard of a crankshaft failing ????

[Britwrench]

Mike,

Quite often the thrust face of the crank wears and then it has excessive end-play...something to check on a PPI or during maintenance.

[drew1]

Maybe I'm wrong, since I've never pulled a 944 crank, but I thought there was the danger of bearing failure due to poor design with the oil holes drilled wrong. I have read the oil to the rod journals has to fight centrigugal force at high rpms. Is this a problen & if so was it corrected in latewr motors?

drew1

[Pilot_951S]

Drew,

I'm not sure about the specificity of the problem but the #2 rod bearing is known to have oil starvation issues during track use. This problem is usually solved by simply changing the rod bearings approximately every two seasons. (approx 50-100 engine hours).

928 cranks have been known to have oiling issues. I'm not sure if this problem is also endemic to the 944.

[Dan Himan]

Oil windage is an general engine design issue, not a Porsche engine design problem.

[nynor]

knife edge the crank, a crank scraper, perhaps some old school bore/stroking. there are some threads regarding new and larger cylinders. i can't remember the name of the company doing the work off the top of my head.