Thread: Noisy gear drive etc?

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Originally posted by lt1s10
gears did do some good in round track motors 20 yrs ago. from 4,000 rpm's to 8,000 rpm's every lap is hard on a chain. they broke big time. nothing like drag racing. belts might be the answer now, but they didn,t have them then.

as far as harmonics go i wroked for UPS in the 1970's and they had about 125,000 300 ford 6 cyl's (with gear drives) running up and down the road like crazy and they adv. 115,000 miles, before the motors was replaced, i dont see where the harmonics had anything to do with it.

Originally posted by lt1s10
gears did do some good in round track motors 20 yrs ago. from 4,000 rpm's to 8,000 rpm's every lap is hard on a chain. they broke big time. nothing like drag racing. belts might be the answer now, but they didn,t have them then.

yes and that is rigth .but just think back 18 years ago when the best you could do was a the iron gear chain set with a true roller chain now look at the rollmaster chain set what a pice of art . not to many of us could afford to have a chain set made like this back then . so thing have come along way and the jesel belt drive is the way to go but hi on price but i have one on my gto they make some killer stuff. so i think the gear drive time has past and they sell them to guys for the street that a good chain set would do the job and use the money some were it will do more good

I think the hype about harmonics is blown out of proportion. Name one person that has had an engine failure due to a gear drive. Document one article that has been written on engine failures due to the use of gear drives. One, just one. True a belt is best, but most of us street rodders as well as other street enthusiasts are not building engines to run on the drag strip or the oval track. If I was building a state of the art Hi Po engine and dropping over 10 grand on the build, of course I would use a belt. But on a street rod or street machine that will never see 100,000 miles, I seriously doubt that it makes any difference.
This has been debated ad nauseum on the Chevytalk.com Performance forum. And like the discussion has gone here, there are gear drive likers and gear drive haters. There is no clear cut answer.

Originally posted by rumrumm
Name one person that has had an engine failure due to a gear drive. One, just one.

i can valve spring and a ups truck is not running any rpm and are not running steel gear like you gear drive. you guys just do not get it ?they are not the way to go . but they sell them to guy s like you do you see them in any hi hp engine if so tell me in boats ? top engine builder ??

I respect your opinion, Pat. I think we may be debating over different applications.

i've seen blown up round track chevy. motors from broken chains, i've never seen a blown up motor where the gear drive broke.. may have happen , but i've never seen one. i've never run one in my life , but i dont see nothing wrong with them either, depends on what you want.

i guess no one here has spent $350.+ for a set of valves springs a was hoping they would last as long as they could or did not want spark scater? or you like to think that harmonice will not kill a engine do you know what amplitude of harmonices will break a valve spring ?? but you will put a gear drive in a engine that will put more harmonices in one i guess i do not know what the hell i am talking about and people like tci atc jack roush fluidamper and jesel and me do not know that harmonices are good. and guys like you want to put more in

i am trying to help you look at this harmonics kill and for you to look for things that make better engines so you can build a better engine i will not try any more

Originally posted by rumrumm
I think the hype about harmonics is blown out of proportion. Name one person that has had an engine failure due to a gear drive. Document one article that has been written on engine failures due to the use of gear drives. One, just one. True a belt is best, but most of us street rodders as well as other street enthusiasts are not building engines to run on the drag strip or the oval track. If I was building a state of the art Hi Po engine and dropping over 10 grand on the build, of course I would use a belt. But on a street rod or street machine that will never see 100,000 miles, I seriously doubt that it makes any difference.
This has been debated ad nauseum on the Chevytalk.com Performance forum. And like the discussion has gone here, there are gear drive likers and gear drive haters. There is no clear cut answer.

IN THE EARLY 90'S I HAD A STRANGE WEAR PATTERN ON MY MAIN BEARINGS I TRACED IT BACK TO A GEAR DRIVE.THE ENGINE HAD ABOUT 70 PASS'S ON IT WHEN I PULLED DOWN FOR RINGS.RODS,MAIN BEARINGS AND VALVE SPRINGS.I BOUGHT A NEW CLOYES TRUE ROLLER NO MORE WEIRD LOOKING BEARINGS.

Originally posted by rumrumm
I think the hype about harmonics is blown out of proportion. Name one person that has had an engine failure due to a gear drive. Document one article that has been written on engine failures due to the use of gear drives. One, just one. True a belt is best, but most of us street rodders as well as other street enthusiasts are not building engines to run on the drag strip or the oval track. If I was building a state of the art Hi Po engine and dropping over 10 grand on the build, of course I would use a belt. But on a street rod or street machine that will never see 100,000 miles, I seriously doubt that it makes any difference.
This has been debated ad nauseum on the Chevytalk.com Performance forum. And like the discussion has gone here, there are gear drive likers and gear drive haters. There is no clear cut answer.

you're 100% right, rumrumm .

Yup, probably just comes down to whether or not you want the extra noise. Gassersrule had a gear drive come apart awhile back on his sbc, went back to a chain. Back in the sprint car days we ran the Pete Jackson set up, but the engines got opened up and checked every week anyway....... I guess it depends on which you are trying to justify using as to that being the exception or the rule.

Personally, I hate the extra noise (I like to be able to hear what the rest of the engine sounds like). Horsepower wise, when compared to a quality double roller chain you would have to have the engine on a dyno to see any difference.

JMO, but I would still rather have any engine run like a race engine instead of just sound like one....... Maybe the geezer in me still likes to sneak up on people with a mild sounding engine exhaust note, then blow them away !!!!!!!