BIG 928

i used this crank in my 993 gt2 engine, porsche want a chassis number to order a crank! does anyone have a part number for these as my dad managed to sort it last time but hes away on holiday at the moment. the engine threw 2 rods out at silverstone last week so it needs a new crank etc etc etc! also is the cup crank the same?

thanks mark

claykos

I don't have the 2000 GT3R manual...
but from the 2002 GT3RS manual: 996.102.021.91
04 RSR is 996.102.021.92
2003 cup is same as 04 RSR

I believe that the only difference is in the way the harmonic damper attaches (press on vs. bolt on). GT3R should be the same number as the 02 RS. Note these numbers are the same as for street GT3s (2001 for the .91 number and 2003-2005 for .92 number).

Rickard 993 Turbo

Whats the cost of does beauties

Geoffrey

Your local dealer can order the crankshaft from a 997 GT3 (non 4.0l) for about $1300 which is the same crankshaft (or rather an updated crankshaft ending in .94 but dimensionally the same).

BIG 928

thanks for the info guys, i should of said my engine is 3.6 can i still order the 997 gt3(non 4.0l) crank? is it the stroke the same as mine, if the 997 is 3.8 does the 997 just have a bore size difference to get to 3.8l.

many thanks this place is great!

regards mark

claykos

3.8 is bigger bore....stroke is the same on both 3.6 and 3.8

Rickard 993 Turbo

Any ide to uppgrade to this crank if you have the turbo/gt2 crank..?

Geoffrey

You will need different connecting rods since the connecting rod journal is smaller than the 993 crank in your car. I've had Carillo make specific rods for that applicaiton.

Rickard 993 Turbo

But is it better ?

BIG 928

thanks, i wasnt sure about the bore and stroke 3.6 v 3.8 so im clear on that now. im gonna order 1 of these cranks . do i need special order rods to suit the crank or was you talking to rickard? dont wanna sound like a idiot but i gotta get this right for obvious reasons lol.

thanks mark

Geoffrey

The GT3 crankshaft is better than your 993 crankshaft (996/997 turbo use the same 993 crank) in several significant ways.

The GT3 crankshaft is fully counterweighted whereas the 993 crankshaft is not. There is about a 2lbs weight penalty for this.

The GT3 journals are smaller, so the bearing speed is slower.

The GT3 has racing bearings available. The 993 bearings are junk and you really need to use the Smart Racing bearings to make it last.

The GT3 has a wider bearing area than the 993 (which I think is one of the largest reasons 993 crankshafts have issues on the track)

The GT3 crankshaft has 180 degree oiling to prevent oil starvation at higher RPM (not really relavant on a common plenum turbo engine)

The GT3 crankshaft again, has a larger internal oiling passage to prevent oil starvation at higher RPM

The GT3 crankshaft is $1300 from the dealer - why in the world would you install anything different in a track based engine? You can sell 993/964 crankshafts for $1800-2500 all day long depending on how badly someone needs one.

You will need a connecting rod with the large end diameter for a GT3 which is smaller than a 964 or 993 and the journals are wider than the 993 and the same as the 964. When you order the connecting rods, I would run a wider rod side clearance than the factory .005"

Glen

Geoffrey, You never cease to amaze me. Thank You for all of Your contributions over the years!
Best,
G

Rickard 993 Turbo

Geoffrey

Super info, thanks a lot now i know what i need to do..

Red9

plus ++++

BIG 928

thanks for the info, im glad they are still the crank of choice. i would still have no problems with the old gt3r crank if the oil starvation hadnt of wrecked mine!!

thanks again