Quiet gear drive or roller chain? - Team Camaro Tech
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post #1 of 10 (permalink) Old Sep 16th, 12, 10:24 PM Thread Starter
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Quiet gear drive or roller chain?

So I have a PJ Noisy gear drive. The whine is too much for me as a driver. So I'm thinking of going with the PJ Quiet, but I am wondering if it is quiet enough. I want to stay with a gear drive for accuracy of timing. PJ is dual idler. Is there a quiet single idler out there? Would you chose gear drive over roller?
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post #2 of 10 (permalink) Old Sep 16th, 12, 10:50 PM
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Re: Quiet gear drive or roller chain?

In my experience, "quiet gear drive" is an oxymoron.

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post #3 of 10 (permalink) Old Sep 17th, 12, 04:35 AM
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Re: Quiet gear drive or roller chain?

Gear drive goes right along with open headers.........
Otherwise, roller chain if mufflers are used.

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post #4 of 10 (permalink) Old Sep 19th, 12, 01:26 AM Thread Starter
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Re: Quiet gear drive or roller chain?

Not looking for gear drive bashing comments. There is enough of that in other threads on the subject. Just facts and experience please!! Thanks!
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post #5 of 10 (permalink) Old Sep 19th, 12, 01:35 AM
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Re: Quiet gear drive or roller chain?

1.
Quote:
Originally Posted by BTELL67 View Post
So I have a PJ Noisy gear drive. The whine is too much for me as a driver.
2.
Quote:
Originally Posted by BTELL67 View Post
So I'm thinking of going with the PJ Quiet, but I am wondering if it is quiet enough.
3.
Quote:
Originally Posted by BTELL67 View Post
Is there a quiet single idler out there?


Quote:
Originally Posted by BTELL67 View Post
Not looking for gear drive bashing comments. There is enough of that in other threads on the subject. Just facts and experience please!! Thanks!

Who is bashing? You expressed concerns about noise three seperate times in one paragraph and both Everett and I basically said the "quiet" gear drives are still loud.

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post #6 of 10 (permalink) Old Sep 19th, 12, 04:17 AM
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Re: Quiet gear drive or roller chain?

As Steiner and I said, gear drives are noisy, whether tagged 'quiet' or not.
Nobody is bashing here, sorry if you read it as such.

However, gear drives goes with open headers, meaning headers are loud and covers up the gear noise, if equipped.
Gear noise does go away if one submerges the gears in oil, but I haven't seen this invention, yet.
If you use mufflers, then use a roller chain, much quieter.

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post #7 of 10 (permalink) Old Sep 19th, 12, 06:27 AM
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Re: Quiet gear drive or roller chain?

I am someone who, after years, is pulling their PJ noisey out for a cloyes true roller. I think the accuracy of the gear drive is a misnomer. I think when something absolutely works in any area, you find it on everything. This is why guys going 150 mph+ use pharachutes to slow down and not empty tin cans. How often do you hear a gear drive at the track? You hear chains and jesel belts (which means you hear nothing). I really believe a gear drive these days is strickly for noise and do not provide accuracy in timing over today's true double rollers.


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post #8 of 10 (permalink) Old Sep 19th, 12, 09:52 AM
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Thumbs up Re: Quiet gear drive or roller chain?

Quote:
Originally Posted by dubs68camaro View Post
I am someone who, after years, is pulling their PJ noisey out for a cloyes true roller. I think the accuracy of the gear drive is a misnomer. ...
... I really believe a gear drive these days is strickly for noise and do not provide accuracy in timing over today's true double rollers.
I agree with everything 'Dub' said

Back-in-the-day the OEM cam drive systems were not up to the task of driving HP cam systems and the use of a gear drive was the only way we could get a cam drive system to hold up under high loads (placed on them by higher valve train rates, higher oil systems demands and ...) and rapid transition RPM use in high performance endurance engines.
The 'match-race' guys still stuck with chains, as most the gear systems added more issues than they cured ... You'd never see a Gear Drive in a "Grumpy" or any other 'name' engine at any drag strip
They are not more 'accurate' at all - they induce odd harmonics and resonance into the systems that can not be easily dealt with, and will be detrimental to the overall performance and life of most engines.
We didn't like some of the other problems they added to the mix - spark scatter, cam wear, additional heat load, ... - but they were the only game in town for quite some time in serious performance endurance engines.
In a modern performance endurance engine - they have no place
We now have chain and belt systems that are well suited for our needs and way capable of handling any cam load demands we can put on them.

Don't get me wrong, I still at times use one in an engine - but those are marine builds that require something other than a standard drive system ...

There's really only one reason to spec. one for a street driven vehicle these days - but stating that would most likely be seen as "bashing"

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post #9 of 10 (permalink) Old Sep 20th, 12, 04:14 AM
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Re: Quiet gear drive or roller chain?

gear drives rob horsepower and the harmonics of engine travels thru gear drive to cam and valve train-if you hear the noise dont you think the noise is being traveled thru your valve train in hense robing hp and wearing parts
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post #10 of 10 (permalink) Old Sep 20th, 12, 04:42 AM
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Re: Quiet gear drive or roller chain?

Roller.....or get some earplugs

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