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Old 03-04-2013, 07:57 AM
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Quote:
Originally Posted by BOBCRMAN@aol.com View Post
About the worst thing you can put in a small block
Here here!!

peace
Hog
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Old 03-04-2013, 10:56 PM
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I looooooooooove mine. It's noisy. Family says they can hear it coming before anything else. When driving though, even after a few hours, it doesn't bother me.. At all.. Dont really notice it unless pointed out. Although, driving something without one, I just feel, empty lol Just a natural sound to me now I suppose.. Very snappy throttle response.
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Old 03-05-2013, 08:59 AM
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I have my gear drive for over 20 years and never had any valve train failure at all. Have travel from Long Island to Maple Grove Penn. and far north to Mass.
The noise level I hardly hear it while driving once the motor is warmed up. I Love the sound of it.
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Old 03-05-2013, 10:14 AM
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The floating idler gear drives may not be a good choice if you have a lot of valvespring pressure, as the bigger idler gear is trying to wedge itself between the crank and cam gears. The harder it is to spin your cam, the worse the wedging force will be. The front cam bearing will show a lot of wear up top, in severe cases the cam can actually bend. A bigger idler gear would help, but these things are usually limited by the designer's need to use a stock timing cover.

In my experience with an sbc/solid roller (200 lbs on the seat), the cam didn't bend but severe front cam bearing wear allowed the cam timing to retard quite a bit. Luckily i had plenty of piston to valve clearance. A simple change to a timing chain and the car picked up the several tenths that it had lost. When the geardrive was removed, the idler gear axles/bushings were quite sloppy, had about .100" of clearance.
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Old 03-05-2013, 12:25 PM
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"Noisy" gear drives are for the "Hey! Look at me!" crowd, they are not for performance. The Milodon is a REAL "race" piece. The Pete Jackson (dual idler) is pretty tough. We had 300-plus seat pressure in Dirty Bird and used the Pete Jackson (the Milodon for the Pontiac would take 6 mos. to get). We had exactly zero issues. 9,200 RPM each pass. It wasn't the "added noise" unit, of course. That engine uses "roller" cam bearings as well.

Gear drive has its "place". High-end racers with serious spring loads can benefit. One piece of advice given me a long time ago, NEVER use a gear drive if you have a two-step or "stutter box" for bracket racing. it can break the gears. A belt-drive is the "way to go" there.

FWIW

Jim
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Old 03-05-2013, 01:39 PM
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Many years ago I had double roller chain in my 350 and after one year of driving it, the chain was loose. That was only a year of use. That's one reason why I switch to gear drive. I never had any problem ever since. And that same gear drive is in my 406.

Last edited by lg1969; 03-05-2013 at 01:46 PM.
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