|
|
|
|
| Author |
|
|
No Expert
|
S-Cam or GE40
I'm building a 2.7 HC right now, and I've gotten conflicting opinions on cam selection. Should I go with the old stand-by S-cams or go with GE40s?
The engine will be a 2.7 9.8:1, w/ Webbers and early sports exhaust. The car is street legal, but mostly used for Non-competitive track events. There are no smog or safety inspections in Florida, and 93 octane, and even race gas is available at the pumps here. Any opinions would be appreciated.
__________________
-- Last Engine rebuild project, Now a coffee table. -- New engine rebuild project, Alive and well. -- '72 911 Martini RS, '69 911E Targa, a 2004 Cayenne S, and a Miata too... Looking for a Cayman S |
||
04-11-2003, 08:09 AM
|
|
|
Registered
|
Have or will you port the heads?
__________________
John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman |
||
|
04-11-2003, 11:16 AM
|
|
|
No Expert
|
No, I'm leaving them at 35mm. This is close enough to RS specs not to bother (36/35mm).
__________________
-- Last Engine rebuild project, Now a coffee table. -- New engine rebuild project, Alive and well. -- '72 911 Martini RS, '69 911E Targa, a 2004 Cayenne S, and a Miata too... Looking for a Cayman S |
||
|
04-11-2003, 01:46 PM
|
|
|
Registered
|
OK; at 36 mm's the factory RS was slightly port constricted, which is why the torque curve more resembed an engine with an E cam rather then the S that it really had. So your engine with...
S Cam: Similar to an RS, but with slightly less top end, but just as good as an RS below 6000 RPM. So 195-200 HP on carbs. E Cam: Better then an S cam below 4000 RPM, not quite as strong as the S above 4000 RPM but I doubt that you'll notice. GE40: About half way between the E and the S. It sounds like a GE40 might be a good fit.
__________________
John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman Last edited by jluetjen; 04-11-2003 at 02:03 PM.. |
||
|
04-11-2003, 02:00 PM
|
|
1969 Porsche 911E 2.2
911 Martini RSR look alike
Cayenne S
Cayman S
1969 Porsche 911E 2.0 E
