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Air Medal or two
Join Date: Jul 2003
Location: cross roads
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Switch cams From SC to 964 What HP Gain?
I have a 2.7 with SC Cams. Puts 155 to the ground.
What would be the expected HP if I switch to 964 cams ? Your thoughts? thanx
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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11-01-2013, 08:51 AM
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ROW '78 911 Targa
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156 HP...
 The gains are in mid range performance. You're really just moving the torque curve around. |
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11-01-2013, 09:15 AM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
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If thats all then i am not interested. the SC Cams made a huge difference......but was just dreaming...
Maybe 964 would be better.......
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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11-01-2013, 09:25 AM
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Registered
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Location: Glorious Pac NW
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964 generally gives slightly more power at high RPM than SC, at the cost of less low and mid range torque.
I'd be surprised if 964 made more than 5% difference to peak HP over SC - and for a car that sees street time, I would just stick with SC unless you have EFI - on the grounds that you'll probably never notice 5% at WOT - but you'll feel low/mid-range pickup every time you accelerate in traffic. You can experiment with the SC cam timing to move the power band around, see if you like this/can put up with it, without needing to actually change the cams out. Factory used the same profile for a long time, with varying timing specs for different years.
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'77 S with '78 930 power and a few other things. |
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11-02-2013, 03:44 AM
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Quote:
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'06 Cayman S '16 Cayenne '08 Audi RS 4 |
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11-02-2013, 04:04 AM
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Air Medal or two
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I will stay where I am at
2.7 - 155 HP / 155 TQ @ at 5500 RPM I guess that is as gooder as it gets with out dropping the heads and cylinders.......not in the mood..LOL
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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11-02-2013, 04:15 AM
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Registered
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Location: Atlanta
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If you are going to pull it all the way down to change cams, go ahead and do pistons with reliefs and get some mod S cams. Of course you will need carbs and SSIs....and and and :-)
Dream of mine to build one with matched cams/pistons/intake exhaust. Probably would not be that great as a street car. Although I had a 3.2 with PMOs and it almost ran like it was fule injected. Just amazing that they have the carbs worked out that well.
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erik.lombard@gmail.com 1994 Lotus Esprit S4 - interesting! 84 lime green back date (LWB 911R) SOLD  RSR look hot rod, based on 75' SOLD 73 911t 3.0SC Hot rod Gulf Blue - Sold. |
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11-02-2013, 07:01 AM
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Air Medal or two
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Thanx for the advise.....but carbs are too stone age for this Old guy.
Maybe some other kind if injection,,,(Not CIS) which i currently run. The point being...if i can extract more HP with cams i am interested.... The SC cams have a LOT under the peddle, not all hype, not all tweekie.
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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11-02-2013, 09:42 AM
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With 964 cams you will need to enlarge the valve pockets in the pistons in a 2.7. Thats what I have been told by John Dougherty.
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Magnus 911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI. 911T Coupe -69, 3.6, G50, "RSR", track day. 924 -79 Rat Rod EFI/Turbo 375whp@1.85bar. 931 -79 under total restoration. |
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11-03-2013, 03:29 AM
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Heinz
1977 Porsche 911 Targa 2.7s
