Timing; Gear Vs. Chain
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Lead Driver
Joined: Jun 2005
Posts: 8,465
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From: Calgary Canada
Timing; Gear Vs. Chain
OK guys and gals, I've searched for this and came up empty.
What is the point of using a timing gear instead of a timing chain? I've heard mention of it a couple places, but I still can't figure out why anyone would bother.
Thoughts?
What is the point of using a timing gear instead of a timing chain? I've heard mention of it a couple places, but I still can't figure out why anyone would bother.
Thoughts?
Playing in the Dirt
Joined: Oct 2005
Posts: 2,302
Likes: 1
From: Southwest Georgia
If you are spending the money to rebuild an engine, go with a good set of double roller timing chains & gears. Hardened & prestretched are the best. I usually use timing sets from the same company that I get the cams from (ie. Comp, Crane, etc.)
Now if you are building a race/high performance engine, gears are only way to go. More timing options, (degrees of advance or retard). And with gears and you don't have to worry about high RPM's, fast rev.'s, or high temps. stretching the chain. But they do make noise.
Now if you are building a race/high performance engine, gears are only way to go. More timing options, (degrees of advance or retard). And with gears and you don't have to worry about high RPM's, fast rev.'s, or high temps. stretching the chain. But they do make noise.
Moderator
Joined: Aug 2002
Posts: 6,103
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From: Southern California
FYI, if you chat with most engine builders who own dyno's, they will confirm the gear drives cost you about 10 hp due to inherient friction. Cloytes double roller nylon coated timing chain (which is what Crane and others sell under their own lables IIRR), is the best way to go.
Mountain Pass
Joined: Dec 2005
Posts: 133
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From: Mackinaw City, MI
I ran an Edelbrock gear drive on a previously owned and built F-150, no problems whatsoever. I put over 50k on that motor, had all crane roller valvetrain, headders and 4bbl. I drove it year round. The gears made a lot more noise at -20F than it did at +80F. Motor pulled real hard all the way to 6k. Not sure I buy the 10hp power loss due to friction. It seems like there would be less friction ...
Elder User
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Senior User
Joined: Jan 2006
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From: Little Falls,New York
Originally Posted by F250Wheels
I'm In The Middle Of Building A Blowin 73 Nova, We Will Be Running A Gear Dive For The Noise.
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Butt-Head
Joined: Apr 2004
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From: Reed Point, MT
Originally Posted by Tech-man
Not sure I buy the 10hp power loss due to friction. It seems like there would be less friction ...
Cody
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Gear drives come in two varieties: Spur cut which are very noisy are fairly efficient. Helical cut are less noisy but they loose some power to friction in the gears and the thrust bearing. Chain drives have friction losses also.
Postmaster
Joined: Feb 2003
Posts: 4,074
Likes: 1
From: Las Vegas
[QUOTE=Blurry94]Me personally, for a daily driver, I'd stick with a good double roller timing set. The gears transmit unwanted harmonics/vibrations between the cam and crank.[/QUOTE
Waaay back when, Honda motorcycles went from gear drive back to chain or belt on the V4 race motors for the exact reasons stated above.
I understand that was for motors that pulled double (or more) the RPM's a V8 would pull but I'd bet the same principles apply.
Waaay back when, Honda motorcycles went from gear drive back to chain or belt on the V4 race motors for the exact reasons stated above.
I understand that was for motors that pulled double (or more) the RPM's a V8 would pull but I'd bet the same principles apply.
Cargo Master
Joined: Oct 2003
Posts: 2,833
Likes: 4
From: Jefferson, Iowa
there are chain sets out there that have much more timing adjustability than gear, ex. the cloyes hex ajust, double true roller, and you can adjust anywhere from 6 deg adv. to 6 deg ret., also has the 3 keyway sproket.actually around here, i seen a lot of the big dogs running dry belt systems, way better timing they say. not very good for street use though.
