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Join Date: May 2007
Location: Sebastopol, the land of wine and redwoods in The Republic of California.
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Cam choice oppinions?

Hello, I'm building a motor based on an 3,0 SC motor. And I would like some expert opinions on my cam choices. I know this has been discussed, but would still like to hear experiences and recommendations from you all.

Motor specs:
3,0L
Heads, '78 SC 39mm intake ports
Ignition, Single plug, re-curved SC distributor
Pistons, JE 9.5 to 1
ARP rod bolts
CR, 9,7 to 1
Carbs, 40mm Webers
Exhaust, '71 stock w/sport muffler
Transmission, '72 915, stock gears
Car, 71 911, 2300 lbs, with driver
Use, 75% AutoX, 20% DE
91 octane gas

I am after a broad flat torque curve. Not necessarily the ultimate in high end HP. My normal shift point would be 6500RPM, but would want to be able to go to ~7200RPM to save a shift.

I am thinking something along the lines of a DC 35, DC 40, or DC 43.

Thanks,
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'71 911 Coupe 3,0L outlawed
#56 PCA Redwood Region, GGR, NASA, Speed SF
Trackrash's Garage :: My Garage

Last edited by Trackrash; 06-20-2016 at 01:57 PM..
Old 06-20-2016, 01:29 PM
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Give DRC A Call

Gordon,

Give John a call - I had similar goals and a similar build. He recommended the GT-2 102 cam profile.

Couldn't be happier, torque comes on at a much lower RPM range as compared to stock (~185 ft lb @ 3,500 RPM equals neck snapping acceleration).

Dyno Results - Gordo's 3.2L

Good luck,

Gordo
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Old 06-20-2016, 08:05 PM
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I was just re-reading your post. It is exactly what I am looking for. I see the GT2 turbo on his site, is that the one?

I have sent Dougtery.com two requests for info, but have not heard back. Thus my post. I guess my next step is to get on the phone if he doesn't chime in.
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Trackrash's Garage :: My Garage
Old 06-20-2016, 09:03 PM
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He's camgrinder here on the forums if you want to send him a private message.
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Kevin L
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Old 06-21-2016, 10:11 AM
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Web 120/104 would also be a good choice. Hot street and club racing, good idle and torque.
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Last edited by Mark Henry; 06-21-2016 at 11:20 AM..
Old 06-21-2016, 11:16 AM
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Quote:
Originally Posted by Mark Henry View Post
Web 120/104 would also be a good choice. Hot street and club racing, good idle and torque.
I was going to suggest those too. I have them in my racecar's engine and so did a friend in his 3.3L short stroke racecar engine.
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Old 06-22-2016, 07:23 AM
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Quote:
Originally Posted by KTL View Post
I was going to suggest those too. I have them in my racecar's engine and so did a friend in his 3.3L short stroke racecar engine.
I was told Web cam was the way to go.

What springs, retainers, rockers are you using and what is your red line?

Thanks,
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#56 PCA Redwood Region, GGR, NASA, Speed SF
Trackrash's Garage :: My Garage
Old 06-22-2016, 10:44 AM
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I have EBS Racing's springs and Ti retainers and so did the 3.3L Original rockers refurbished with cgarr's low friction bushings. Redline is 7500. Both cars had Weber 46. Mine was a 3.2 short stroke
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Kevin L
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Old 06-22-2016, 11:40 AM
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Quote:
Originally Posted by KTL View Post
I have EBS Racing's springs and Ti retainers and so did the 3.3L Original rockers refurbished with cgarr's low friction bushings. Redline is 7500. Both cars had Weber 46. Mine was a 3.2 short stroke
What is your maintenance schedule for your TI retainers? Do you ever replace them?
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Gordon
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'71 911 Coupe 3,0L outlawed
#56 PCA Redwood Region, GGR, NASA, Speed SF
Trackrash's Garage :: My Garage
Old 06-22-2016, 05:23 PM
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Not sure what a projected time-out is for the springs and retainers. My engine build is rather mild, so I planned on 120+ hours of sustained track driving.

Henry @ Supertec or chris_seven @ Fenn Lane would have a better answer than me!
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Old 06-23-2016, 06:54 AM
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