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ChrisP911's Avatar
 
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930 crank

How can you tell the difference between a 3.3 930 crank and a reg. Porsche crank.

Thanks
Chris
Old 05-08-2014, 12:53 AM
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^ that depends entirely upon what "regular Porsche" crank you are talking about. You need to be a bit more specific here to get a detailed answer.

The 3.3L 930 shares the crankshaft with the 3.2L Carerras...so no difference. 3.0L SCs have a different crank...I believe shorter stroke, and different rod journal sizing.
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Current: 1983 911 GT4 Race Car / 1999 Spec Miata / 2000 MB SL500 / 1998 MB E300TD / 1998 BMW R1100RT / 2016 KTM Duke 690
Past: 2009 997 Turbo Cab / 1979 930
Old 05-08-2014, 04:03 AM
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Quote:
Originally Posted by jwasbury View Post
^ that depends entirely upon what "regular Porsche" crank you are talking about. You need to be a bit more specific here to get a detailed answer.

The 3.3L 930 shares the crankshaft with the 3.2L Carerras...so no difference. 3.0L SCs have a different crank...I believe shorter stroke, and different rod journal sizing.

jwasbury you answered it thanks. DO you know if their are casting numbers on the crank.
Old 05-08-2014, 04:27 AM
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Check and make sure the distributor drive gear is the same. I remember reading some of them are diffferent and are for distributors that turn the opposite direction. I think it presses on like the cam chain sprocket and can be changed.
Old 05-08-2014, 05:31 AM
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Quote:
Originally Posted by JFairman View Post
Check and make sure the distributor drive gear is the same. I remember reading some of them are diffferent and are for distributors that turn the opposite direction. I think it presses on like the cam chain sprocket and can be changed.
Yeah thats the difference between the 3.2 crank and the 3.3 crank. The drive gears which can be changed.
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's.
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Old 05-08-2014, 05:57 AM
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Except 964 turbo 3.3, they use the 3.2 gear and normal rotation dizzys.
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Old 05-08-2014, 02:01 PM
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While we are on the subject of cranks. The issue of crappy glyco bearings keeps coming up. Aparently gt-3 crank main bearings work and are of much higher quality. There is a thread over on the engine rebuilding forum. main bearing alternative
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's.
05 Cayenne S lapis blue
Old 05-08-2014, 02:10 PM
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There are some differences in oiling holes. I don't remember what the differences are to do with years and 3.2 3.3
Old 05-08-2014, 08:55 PM
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Quote:
Originally Posted by turbo nut View Post
There are some differences in oiling holes. I don't remember what the differences are to do with years and 3.2 3.3
^^^ What he said.

I used a std/std 3.2 crank when I spun a rod bearing years ago and haven't had any bottom end issues since with 10's of 1000's of miles use, even with more power. Factory bottom end is tough, apart from the original rod bolts made from string cheese. ARP rod bolts are not only essential, they're re-usable.

But there are differences. Until you get into using very high power levels for sustained periods it's probably "meh, so what". If you were very serious, you'd likely be modifying or swapping out the crank and/or the factory oiling arrangements entirely anyway.
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Old 05-09-2014, 12:59 AM
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thanks guys
Old 05-11-2014, 01:57 AM
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