|
|
|
|
| Author |
|
|
Registered
|
2.4 vs. 2.7 crank shaft
Can anyone help me understand what the differences are between a 2.4E and 2.7E crank shaft?
I have a 2.0l aluminum case that I am preparing for displacement increase. I have 2.4 P&C for the engine and I have 2.4S heads and cams. Is there a difference in stroke between these two crank shafts? Thanks all, |
||
11-30-2007, 03:22 AM
|
|
|
GAFB
Join Date: Dec 1999
Location: Raleigh, NC, USA
Posts: 7,842
|
All production 6-bolt 70.4mm cranks are the same.
__________________
Several BMWs |
||
|
11-30-2007, 05:15 AM
|
|
|
Moderator
Join Date: Dec 2001
Posts: 9,569
|
They are both 70.4 stroke. You will also need rods for a 70.4mm crank, they are shorter and have a wider bearing saddle. The rod/stroke ratio is not as favorable as the 66mm crank.
__________________
'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
||
|
11-30-2007, 05:35 AM
|
|
|
Registered
Join Date: May 2003
Posts: 3,346
|
Your crankcase may need to be clearanced so the bottom of the pistons doesn't hit the case. A good Porsche machine shop can confirm this and do the work. My machinist is Ted Robinson at German Precision (408) 747-0728.
-Andy
__________________
72 Carrera RS replica, Spec 911 racer |
||
|
11-30-2007, 07:00 PM
|
|
