just as it says.... anyone have a Gear driven set up other than the single or double timing chain???

what are the cons or pro's for it

 

Cons- Its noisy, expensive, and will rob you of a few HP.

Pros- It will never wear out and has much more accurate timing control.

For most people, a double roller is the better choice.

 

Cons- On Computer systems noise may be interpreted as knock thereby causing the engine to retard timing causing power loss.

 

im not running a computer.. its a carb.. and the summit says they have noisy or quiet gears.

i was just wondering cause my car is about to get a few parts changed here and there and i was thinking about the timing chain while i change the cam.

so a double roller is better?

 

Prove it before you say it. That myth that it will set off the knock sensor is a load of crap.

As for whats better, if its just a mild street-strip type build you're best off with a good double roller, unless you really wanna hear the whine of a gear drive.

 

That’s why I said MAY BE, I am no expert and I do not have a gear drive on my car, but it has been brought up that it MAY BE an issue to look into. When the gear drive manufacturer [Edelbrock] does not even recommend it for computer-controlled applications with knock sensors it seems to throw up a red flag in my personal opinion.

Edelbrock Accu-Drive Timing Gear Drive

The Accu-Drive camshaft gear drive kit replaces a stock timing chain with a precision gear drive system. The gear drive can be easily installed. Just replace the stock crank and camshaft sprockets with Accu-Drive gears and slip in the idler assembly. The Accu-Drive gear drive system transmits power from the crankshaft gear to a full floating main idler which drives the camshaft gear. The unique feature of the Edelbrock Accu-Drive system is the ability of the main idler gear to float to an optimum position between the crankshaft and camshaft gears assuring absolutely equal load sharing between the crankshaft and the camshaft gears. Important Note: Accu-Drive Gear Drives are not recommended for use above 7,000 rpm or on computer-controlled vehicles with knock sensors.

http://www.jegs.com/cgi-bin/ncommerc...85&prmenbr=361


If I was Vic Edelbrock I would be pi$$ed that some one made up some myth about gear drives being unusable on computer controlled cars which would cost thousands of dollars in lost sales. But what the heck does Edelbrock know?? He probably only has a few hundred engineers working for him in R&D, wait until he reads this post and figures out it has all been a big mistake, heads are goanna roll!!!

Oh well, as I said before I personally don’t have a gear drive myself and I am not a gear drive expert. But, when the manufacturer of the part says not to use it because it will cause problems with my application I wont use the product. I have a hard enough time getting the stuff that they say is compatible to fit/work in the first place.

 

I think it's more myth than fact. I had a gear drive, and a cam that was way too steep on my engine when I first did my swap. The engine was very hard to turn over, but that could have been the combination of the gear drive and the cam.
I replaced the cam and have a double roller timing chain now. It turns right over. I loved the sound of the gear drive, but I think it was the culprit preventing my car to crank over, and yes, it does rob you of a little HP.
When I put the double roller, the car would turn right over without a hitch. I felt more power too.
(But then again it could be because of the cam too.) Hard to say, but I did enjoy the sound of the gear drive.
The whirrrrrrrrrrrrr is cool, but the con of it is that you may drain your battery and burn up your starter from it. (and possibly lose a little power...)
Other than that, it's cool.

 

Obviously.

I do have one, and I ignored all the advice from manufacturers (every single one of them says stuff about the knock sensor, not just Edelcrock) and listened to what people said who were running gear drives and engine builders who had installed them. Theres no false knock. In 4 years of being on this board looking for someone with a false knock problem, I havent found one. Its a myth.

 

when i first built my engine i let people talk me out of installing one. i put a new cam in this winter and love the sound,i've got the noisy one.it's not as noisy as i thought but you can hear it.gives people 1 more reason to look at you funny

 

I know when these first came out they were the "hot" item but everyone I've talked to at the track, and 2 local engine builders say they're hard on the internals cause they create too much harmonics. Are you guys using them for racing or daily drivers and have you had any problems with long term reliability? I'm running a double roller myself after hearing all the negatives from the guys on vavletrain wear, so I just want insight for future reference/arguing material.

 

No problems so far. Its been on the car 8 years, 11,000 miles. I had the valve covers off not too long ago and I didnt notice anything abnormal. The car obviously isnt driven much, but its seen WOT quite a few times. It shifts out of first at around 6500 and second at 6000, so I'm sure the RPM's are plenty high enough to create problems if there were to be any on most street driven cars. I know the tach has been way past that before a couple times out of curiosity to see how it fared, but it wasnt really making enough power up that high to shift there, so I dont.

I've heard about harmonics too, but I think thats mostly the guys who are running way closer tolerances and much more HP than I am that are having problems. Not to mention those guys are now running belt drives since they soak up less HP than a gear drive and supposedly transfer much less harmonics to the valvetrain. They are much more costly though.

 

I have a geardrive in my 84 corvette as i have said before on here it has been in the car for about 5 years and i have had no false knocks or anything else go wrong with it and it is very noisy.I agree with max i think it is a myth.
As for durability?I had a pj geardrive in another car with a 350 chev and we went on a roadtrip for about 2k miles there and back.On the way back i lost oil pressure and before i realised the engine had seized.
Once i got the car back home i pulled the engine apart to find
1:Hole in the oilpan.
2:Two broken conrods.
3:Hole in block
4:Cam broken into three bits.geardrive still connected.
The engine was running fine before we left just driving around my area and going to work and back.
I don't know if i am correct or not but i do believe at (constant highway speeds)the vibration of the camgear,crankgear and idlers in the middle caused the engine to blow up.
Like i said i don't if that is what happened but that is what i think caused it.
So me personaly i would have one in an everyday car if you are just driving around town or racing at the strip.
But if i was going to go on the highway on a regular basis or on long trips i would not have one.
Sorry for the long post.



Jeff