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Old 06-16-2003, 20:44   #1 (permalink)
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Gear driven v Chain Driven

Hey ppls, just had a thought of a gear drive in my clevo, was just wondering what the performance and durability difference between the two are???

just havent seen a discussion bout this yet...

Cheers boyz
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Old 06-16-2003, 23:15   #2 (permalink)
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they make a hell of a mess when a tooth snaps off:)
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Old 06-16-2003, 23:44   #3 (permalink)
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Gears are stronger, make more noise, and are more expensive.
Chains are quieter, cheaper, and strong enough for most applications.

Gears do give more accurate valve timing, but some also say they are harder on the valve train. In a street engine I'd have to agree.

I'd use a chain.

Rick.
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Old 06-17-2003, 01:57   #4 (permalink)
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ive also heard the gear drives push the intermediate gears into the side plates and fail. im going a chain.

about strengh, a 700hp at the wheels NA windsor at summernats used a belt!
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Old 06-17-2003, 03:26   #5 (permalink)
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from what I know a good chain ( I prefer Ford Motorsport ones as my experience shows they tend to stretch less) will work just fine. The accuracy you may or may not gain from gear drive will be offset by the noise if nothing else. I have also heard they can make cams more likely to break because of harmonics but thats just anecdotal.. never seen it happen my self.
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Old 06-17-2003, 03:39   #6 (permalink)
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Quote:
Originally posted by xa-coupe
I have also heard they can make cams more likely to break because of harmonics but thats just anecdotal.. never seen it happen my self.

I can confirm this . I don't know about the harmonics , but coming home from the pub around 12 years ago , my solid cam ( Crow ) snapped in half at 7000rpm . The only redeemable features of my beloved cleveland were the intake manifold , carby , heads and sump .
Admittedly , this thing was revved to 7000 rpm for almost 3 years every day of its life . It ran a set of Pete Jackson straight cuts .
A good double row timing chain is just as good , and won't piss the neighbours off either.
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Old 06-17-2003, 04:11   #7 (permalink)
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Admittedly , this thing was revved to 7000 rpm for almost 3 years every day of its life
hrmm... I sense a connection
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Old 06-17-2003, 05:43   #8 (permalink)
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Yer , I reckon you're right with the connection , BUT , we never knew what actually caused the cam to snap . The motor just stopped dead at high revs , It snapped valves ( due to cam , but not the cause ) smashed the oil pump , and bent 3 rods ( I sheared completely in half and went through the side of the bore wall . Funny thing is , the crank had a huge gouge on the counterbalance ( I think due to the floating oilpump ) .
My thoughts were the oil pump snapped and got caught , causing the thing to come to a grinding halt . Still don't know to this day .
What a bummer . $8000 down the drain
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Old 06-22-2003, 04:22   #9 (permalink)
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Re: Gear driven v Chain Driven

dual idler gear drives are crap, but dont stretch or generally break. they do transfer harmonics from the crank, then double them for the cam, and cause top end flutters. a proper gear drive is a single idler, not a cheapo pete jackson! a single idler isolates the crank from the cam.we ran dual idlers on a 600hp alloy headed clevo, and they left light marks on the timing cover over a few years, but not enough to worry about, bigger problem is the water pump threads, which we drilled out, and welded nuts to.the gear drive and timing cover has been used in a lot of our engines, to no improvement, in the end we just use a rollmaster adjustable
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Old 06-25-2003, 01:22   #10 (permalink)
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Re: Gear driven v Chain Driven

Quote:
Originally Posted by Fordhead
I can confirm this . I don't know about the harmonics , but coming home from the pub around 12 years ago , my solid cam ( Crow ) snapped in half at 7000rpm . The only redeemable features of my beloved cleveland were the intake manifold , carby , heads and sump .
Admittedly , this thing was revved to 7000 rpm for almost 3 years every day of its life . It ran a set of Pete Jackson straight cuts .
A good double row timing chain is just as good , and won't piss the neighbours off either.
running it to 7000 for so long, did u notice oil pressure go down? what bearing were u using in the block? i can see my clevo seeing 7000 in the future.
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