|
|
|
|
| Author |
|
|
New-ish 911SC Targa Owner
|
Carrera 3.0 top end differences from SC
I'm trying to learn what might have be different on the carrera 3.0 to allow the 7200 revs.
As I understand it, the cams were the same and the valve size too. Anything else that mad 7200 safe for this motor compared to an SC?
__________________
'83 Targa 300k w/ freshened 3.0 with 930/52 case# 6770540 ARP and Raceware hardware - AEM Infinity 506, Triumph T595 ITBs, B&B headers, Dynomax muff, Fidanza FW, Alum PP-203whp |
||
10-25-2017, 11:50 AM
|
|
|
Moderator
|
Quote:
__________________
Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
||
|
10-25-2017, 12:41 PM
|
|
|
Registered
Join Date: Oct 2004
Location: Fayetteville, NC
Posts: 680
|
Bill,
What did that do? From what I'm hearing they used 95mm pistons?
__________________
'77 911S w/'81 3.0/MegaSquirt/MSD '81 911SC stock |
||
|
10-25-2017, 12:58 PM
|
|
|
Registered
Join Date: Apr 2003
Location: Maitland, Florida
Posts: 892
|
I don't beleive any CIS engine was reving to 7200.
A Carrea RS 3.0, which had the old S cams and a plunger type fuel injection. It would rev to 7200. I'm betting a Carrera 3.0 was redlined at 6300 like an SC. Jerry
__________________
82 911SC Targa (05 Boxster S ) gone, but not forgotten 87 Suzuki GSXR-1100 1953 MG TD Mk II |
||
|
10-25-2017, 01:23 PM
|
|
|
Moderator
|
Quote:
max hp was 2000@6k max revs was 6800+/200 The bottom end is lighter than that used in the '78 up 3.0 SC's the 2.7 conrod bush is 25.99+/-1mm the SC 24.9+/-1mm 2.7 conrod bigend width is 23.75+/-5mm SC is 21.75+/5mm 2.7 conrod small end width is 25.01+/-1mm SC is 22.025+/.025mm 2.7 main bearings 56.990-56.971 SC 59.71-59.990 2.7 conrod 51.990-51.971 SC 54.971-54.990
__________________
Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
||
|
10-25-2017, 02:01 PM
|
|
|
Moderator
|
Quote:
__________________
Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
||
|
10-25-2017, 02:02 PM
|
|
|
|
Registered
Join Date: Apr 2003
Location: Maitland, Florida
Posts: 892
|
Learn something new every day.
__________________
82 911SC Targa (05 Boxster S ) gone, but not forgotten 87 Suzuki GSXR-1100 1953 MG TD Mk II |
||
|
10-25-2017, 08:55 PM
|
|
|
Registered
|
Inch by inch the Carrera 3.0 emerges as something unique versus its younger brother the SC. Thanks Bill!
|
||
|
10-25-2017, 09:20 PM
|
|
|
Registered
|
Quote:
Was it a good idea? Doubtful. Did it do any harm? Nope. 
__________________
Mike 1976 Euro 911 3.2 w/10.3 compression & SSIs 22/29 torsions, 22/22 adjustable sways, Carrera brakes |
||
|
10-26-2017, 04:02 AM
|
|
|
Registered
Join Date: Sep 2015
Location: Costa Rica and Pennsylvania U.S.
Posts: 3,301
|
redline
Redline was 6800.Big difference was the crank weighed about 5 lbs.less so point A to B was quicker which is where most races are won.Ciao
|
||
|
10-26-2017, 06:24 AM
|
|
|
Registered User
Join Date: Jul 2016
Posts: 133
|
Quote:
|
||
|
10-26-2017, 07:29 AM
|
|
|
New-ish 911SC Targa Owner
|
Here is a pic of my 2.7L crank. notice the counterweights are thinner in addition to the smaller diameter journals.
 Here is a 3.0 crank for comparo:  Thanks for the info Bill. I had seen 7200 mentioned elsewhere but I'll trust your 6800.
__________________
'83 Targa 300k w/ freshened 3.0 with 930/52 case# 6770540 ARP and Raceware hardware - AEM Infinity 506, Triumph T595 ITBs, B&B headers, Dynomax muff, Fidanza FW, Alum PP-203whp Last edited by pampadori; 10-26-2017 at 08:27 AM.. |
||
|
10-26-2017, 08:25 AM
|
|
|
|
Registered
Join Date: Apr 2008
Location: Houston TX
Posts: 8,740
|
Someone here did a 3.2SS engine with the C3 block. That thing must just SCREAM.
__________________
Mike Bradshaw 1980 911SC sunroof coupe, silver/black Putting the sick back into sycophant! |
||
|
10-26-2017, 10:12 AM
|
|
|
Reiver
Join Date: Nov 2011
Posts: 57,631
|
The Euro 930-10 SC is also rated at 6800 +/- 200 rpm....at least for the 82/83 model years.
__________________
De Oppresso Liber Strength and Honor 5th Legion |
||
|
10-26-2017, 12:24 PM
|
|
|
Moderator
|
Quote:
the interesting thing is the catless cars w/ that motor govern it w/ a distributor rotor which cuts the spark, just like the C3 the same year SCs which have cats govern the 6500+/- limit w/ a fuel pump cutoff
__________________
Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
||
|
10-26-2017, 02:47 PM
|
|
|
Registered
Join Date: Jan 2012
Posts: 1,244
|
Funny everyone here seems to think a lighter crank enables higher revs?
|
||
|
10-28-2017, 01:54 AM
|
|
|
Bland
|
In my 2.7 with webers, mod40 cams, 9.8:1 pistons, RS advance curve, I run to 7300. I made this change so I wouldn't have to shift to 3rd in the hairpin at a track I used to race it. It was worth about 2 seconds for me.
__________________
06 Cayenne Turbo S and 11 Cayenne S 77 911S Wide Body GT2 WCMA race car 86 930 Slantnose - featured in Mar-Apr 2016 Classic Porsche Sold: 76 930, 90 C4 Targa, 87 944, 06 Cayenne Turbo, 73 911 ChumpCar endurance racer - featured in May-June & July-Aug 2016 Classic Porsche |
||
|
10-28-2017, 05:27 AM
|
|
|
Bland
|
Bill - what direction does the rotor turn in a C3? Is it the same as a SC?
I guess I could just go check on my early Turbo 3.0
__________________
06 Cayenne Turbo S and 11 Cayenne S 77 911S Wide Body GT2 WCMA race car 86 930 Slantnose - featured in Mar-Apr 2016 Classic Porsche Sold: 76 930, 90 C4 Targa, 87 944, 06 Cayenne Turbo, 73 911 ChumpCar endurance racer - featured in May-June & July-Aug 2016 Classic Porsche |
||
|
10-28-2017, 05:29 AM
|
|
|
Registered
|
Quote:
|
||
|
10-28-2017, 06:02 AM
|
|
Jeanine
1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
1976 Porsche 911
Crop Duster
Kachow
1976 Porsche 930
