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CC Advertisers
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01-19-2004, 10:47 AM
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CC Member
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Join Date: Jun 2003
Location: ALBUQUERQUE,
NM
Cobra Make, Engine: West Coast Cobra weber fuel injected 557 C.I.. 800H.P 760LBS. TQ. Magnum T56
Posts: 330
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Not Ranked
0 +4 Or +8 Timing Setting On 514 C.i.
I just purchased a Gear Drive system to replace my timing chain with. Why do they give you 0 deg. +4 deg. and +8 deg. settings on the main gear? I was going to just intsall it at zero but is it to my advantage to use one of the other settings?Can someone shed some light on this subject for me?
Thanks Gary 
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WHEN YOU HAVE MORE HORSEPOWER THAN YOU NEED ITS STILL NOT ENOUGH!!!!!!!
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01-19-2004, 12:28 PM
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Senior Club Cobra Member
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Join Date: Jul 2000
Location: Chilliwack,BC,
BC
Cobra Make, Engine: F5 Roadster
Posts: 1,422
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Not Ranked
Gary,
the ajustments will move your powerband up or down a bit.
If you retard the cam timing it will give you more top end,
If you advance the cam, it will give you more bottom end.
In general you would run the cam straight up at 0*. The marks are also usefull to DEGREE the cam in. There is good info on how to do this at crane cams or comp cams website.
Perry.
PS- Ford retarded all the smog 460 engines 8* from the factory to reduce emmissions, so if you had a smog engine and just replaced thetiming set with a performance set, you would gain major power.
Last edited by HighPlainsDrifter; 01-19-2004 at 12:32 PM..
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01-20-2004, 09:25 AM
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CC Member
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Join Date: Mar 2002
Location: so cal,
Cal
Cobra Make, Engine: I used to fix them for a living
Posts: 2,563
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Not Ranked
Why do you think a gear drive will be better than a chain?
You really should degree the cam after changing to the gear drive setup, unless you are comfortable with "hoping it's right" instead of checking to be sure it is right.
__________________
In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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01-20-2004, 09:54 AM
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CC Member
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Join Date: Dec 2003
Location: QUINLAN,
TX
Cobra Make, Engine: BDR 89 KEITH CRAFT ALL ALUMINUM 427 WINDSOR
Posts: 273
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Not Ranked
Gary, on other thing to consider in changing degree of cam is the piston to valve clearance. On my 514 clearance of PtV was only .085 fairly close. This was at 0 degree when degreeing cam.I played with setting it 2 degrees advances, loss about .028, valves barely touched, real tight. May not be as critical in your setup, was in mine with running over 800 lift on intake.
DON
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01-20-2004, 11:27 AM
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CC Member
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Join Date: Jun 2003
Location: ALBUQUERQUE,
NM
Cobra Make, Engine: West Coast Cobra weber fuel injected 557 C.I.. 800H.P 760LBS. TQ. Magnum T56
Posts: 330
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Not Ranked
Mr. fixit, I think a chain is just as reliable as gears. You just dont get the sound (which I personally like) and since I have a supercharger already I just thought it would sound that much better. The chain I removed had no setting, only zero. I just assume put the gear drive at 0 also and verything should be exactly the same as before. I was just curious as what the advantage/s were with other degree setteings and it seem best to leave it at zero. DC COBRA I dont have near the clearance problems ( IKNOW SOME PEOPLE THAT WOULD LOVE THOSE "PROBLEMS") that you do. I only "ONLY" have 620 lift. 
__________________
WHEN YOU HAVE MORE HORSEPOWER THAN YOU NEED ITS STILL NOT ENOUGH!!!!!!!
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01-20-2004, 12:24 PM
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CC Member
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Join Date: Mar 2002
Location: so cal,
Cal
Cobra Make, Engine: I used to fix them for a living
Posts: 2,563
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Not Ranked
advancing or retarding the cam are techniques used by engine builders to fine tune the valve timing. Also, many times the cam is not ground right where it should be so you have to advance or retard it just to get it where it should be. Degree it with the chain, repeat with the gearsetup, make sure they are the same.
__________________
In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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01-20-2004, 05:55 PM
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CC Member
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Join Date: Mar 2001
Location: Indianapolis, Indiana, U.S.A.,
IN
Cobra Make, Engine: Home built, supercharged 544cu/in automatic
Posts: 924
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Not Ranked
Gary - set that sucker to 0, retard the ignitition to a total of about 22 degrees, and fire that blown, noisey sucker up. What you are talking about is tuning stuff. That's better done later, after you start to work the car out. BTW - If you have to advance/retard that bumpstick any more than 4 degrees to get more power, then you've got the wrong cam grind. I personally think the number is closer to 2 degrees. A timing chain set is fine tuned using offset keys in the keyway, sold by all the cam producers. PSSSS! Also only the blower guys know this little secret. You don't have to do all of that trick stuff on a engine with a blower to make power. Fact is, the tricks will most likely work against you if you do. You "tune" blowers by in large with a pully change. The camshaft is almost secondary with a blower. The only thing that is important is the static compression number and the exaust work you've done. Now go get em.
cobrashock
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Ron Shockley
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