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Author
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Topic: Gear drive on a 302
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77 Cobra
Journeyman Posts: 35
From: Bladen,Nebraska
Registered: Jun 2002
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posted 10-29-2002 03:17 AM
   
Any help here is greatly appreciated.I got a 302 I am building and am putting in an edelbrock gear drive.For the best street performance etc.would I be best to install it 4 degees advanced or retarded or staight up?
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Mike Patterson
Journeyman Posts: 34
From: Huachuca City, AZ, USA
Registered: Mar 2001
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posted 10-29-2002 08:11 AM
It's really going to depend on the engine combination your running, (Compression, Intake, Exhaust, Cam etc). In general terms (as I understand it) advancing the cam usually builds more bottom end torque and less top end HP and retarding it makes more top end HP while giving up bottom end torque. Several years ago I would almost always go 4 degrees advance. I built 2 engines within a couple of weeks of each other that would heat, knock and not make the power they should. I found out later the cam grinder had started cutting 4 degrees advance into his cams (resulting in in 8 degrees when I advanced it 4). My suggestion would be to talk to the cam manufacture and see that they recommend. If you can't find out the info from them, I would recommend straight up.
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John Holloway
Gearhead Posts: 933
From: Romeoville Illinois
Registered: Jul 2000
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posted 10-29-2002 12:22 PM
77,I have a pete jackson and its straight up!
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77 Cobra
Journeyman Posts: 35
From: Bladen,Nebraska
Registered: Jun 2002
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posted 10-30-2002 03:44 AM
Thanks guys I installed it straight up even though I am aiming for low end HP.I think I will still have plenty with the gears etc. that I am running.Thanks again.
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Blue_coyote
Journeyman Posts: 10
From: North America's hemp basket(BC Canada)
Registered: Sep 2002
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posted 11-02-2002 10:53 PM
Hmmmm... Anyone know if this theory could be adapted to the gear-driven 2.8? I'm running one in my Bronco II (same engine), with about 200 hp, and since its an offroading 4x4, I'd be MUCH happier with more torque (and its not like I need top-end. I got an excessive speeding ticket with this truck, which cost me $345...) Could the cam be advanced a couple of degrees just by pulling the timing gear and moving it over a tooth or two?------------------
Blue coyote
78 T-top MII (was V8-now no driveline...)
84 BII trail beast (200hp 2.8 5-speed)
85 BII street beater (2.8 slushbox)
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Percy Hazel
Journeyman Posts: 58
From: Bellingham, WA, USA
Registered: Jul 2000
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posted 11-03-2002 01:51 AM
One or two teewt would probably = 10-20 degrees.
What you would have to do is contrruct a new zero [straight up] and cut a new keyway that would give you the 2-4 degrees that you want.
Check out one of the crank sprockets that have multiple settings to get an idea of what you need.
This kind of thing can be done on the cam gear also.
On the 2.3 4cyl we used to file the cam sprocket keyway about .06 wider than rotate the sprocket to take up the excess and than lock down the cam bolt. Was a big time low end improver and never really hurt the top end.
Good luck
Later
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perce111
78T-Top...IAM TOO
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Blue_coyote
Journeyman Posts: 10
From: North America's hemp basket(BC Canada)
Registered: Sep 2002
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posted 11-03-2002 05:25 PM
Cool. I haven't looked at the timing gears for a while, so I wasn't too sure on the math. I like the filing the keyway trick (well within my price range), and I have a couple of spare gearsets in case I mess it up.Thanks fer the info, eh?  ------------------
Blue coyote
78 T-top MII (was V8-now no driveline...)
84 BII trail beast (200hp 2.8 5-speed)
85 BII street beater (2.8 slushbox)
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