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Old 12-03-2006, 08:38 AM
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Timing Chain Stretch??

Has anyone here heard of eliminating timing chain stretch via this method: Mix a little moly lube in a pan with some oil,put timing chain in it,heat to 200 deg F for an hour or so? I read this in one of my big block Chevy books,apparently Gary Grimes of Grimes Automotive Machine does this,strange but true!!

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Old 12-03-2006, 08:44 AM
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Never heard of it. I always used true roller double roller chains and never were bothered with stretch.

Vince
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Old 12-03-2006, 08:50 AM
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I can see how it might lube the chain somewhat, but resistance to stretching would be a physical characteristic unchanged by a stint in a 200 degree oven.
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Old 12-03-2006, 10:24 AM
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Quote:
Originally Posted by 302/Z28
Never heard of it. I always used true roller double roller chains and never were bothered with stretch.

Vince

I don't know how you would measure stretch, but wear will cause up to 4* retarded timing.

Just set your engine on the timing mark and rock the crank back and forth to see how much slack is in the timing set by watching the rotor for movement. I have seen 4* lots of times. Stock silent chains have had 6*.

I always time an engine with 2* more cam advance than specified because it is only going to get slower.
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Old 12-05-2006, 08:29 PM
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I suspect the heat just helps the lube flow better into all the nooks and crannies of the chain, prelubing it.
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Old 12-05-2006, 08:36 PM
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i dont think that will do anything other than pre-lubricate the chain before startup...a good way to eliminate timimng chain stretch is with a gear drive lol
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Old 12-05-2006, 09:11 PM
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???

Is a gear drive that much better??
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Old 12-05-2006, 09:12 PM
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Double roller

Ive always used a double roller chain, Sorry about the double post..

Last edited by DV8; 12-05-2006 at 09:13 PM. Reason: double post...
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Old 12-05-2006, 09:22 PM
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gear drives have the best timing accuracy but they do transfer some of the crank harmonics to the valvetrain instead of absorbing them liek a chain or belt drive would.......but i know a guy that has ran a gear drive on a 400 small block for 165,000 miles not a single problem so idk i say go gear!!!!
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Old 12-05-2006, 10:07 PM
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Plus most of your over the road diesel truck engines have gear drives for a bunch of things. They go a million miles so must be something good about them. I will stick to chain though.
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Old 12-06-2006, 05:38 AM
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Change the chain and gears every 200000 miles - easy cure.
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Old 12-06-2006, 06:34 AM
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i changed from double roller to gear drive and noticed alot more power
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Old 12-06-2006, 06:35 AM
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Quote:
Originally Posted by xntrik
I don't know how you would measure stretch, but wear will cause up to 4* retarded timing.

Just set your engine on the timing mark and rock the crank back and forth to see how much slack is in the timing set by watching the rotor for movement. I have seen 4* lots of times. Stock silent chains have had 6*.
Your example is most likely the best to determine. Also spark scatter on the light may be a major result and measuring the chain deflection while the front cover is off.

Quality parts and double chains will also keep it tight. You also have to consider cam/crank CL's being off (as a result of initial machining (built-up tolerances) and squaring the deck/saddle. CLOYES can make custom length chains.

Actually, in gear drive, the outer gears have the ability to float somewhat as opposed to direct gear drive (upper-lower gears) (reverse valve train rotation)
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Old 12-06-2006, 08:15 AM
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Quote:
Originally Posted by runn141
i changed from double roller to gear drive and noticed alot more power

Must have changed the installed ICL???
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