gear drive

[rickykline]

knock sensors dont detect a certian freq. ive hit the block of my 3400 with all kinds of different tools with the motor running and its yanked timing out of it... any vibration will set of a knock sensor.. its just a piezocrystal.. if it vibrates it makes current the pcm sees that and yanks timing to fix it..

[AaronGTR]

knock sensors dont detect a certian freq. ive hit the block of my 3400 with all kinds of different tools with the motor running and its yanked timing out of it... any vibration will set of a knock sensor.. its just a piezocrystal.. if it vibrates it makes current the pcm sees that and yanks timing to fix it..

What are you smoking? Yes, they do. Any old vibration won't do it... if that was the case then the motor running at all would set off the knock sensor. Vibrations have frequencies you know. Thats all they are is frequencies. A heavy vibration is a longer wave length and smaller vibration is shorter. A heavy strike or an explosion makes a large frequency. The knock sensor looks for something that makes enough resonance in the block, hence if you hit it with a hammer it makes a metallic impact and sets off the knock sensor. That impact simulates detonation because it creates enough vibration to reach the threshold of the sensor just like an explosion in the cylinder would do. If you just tapped the back of the block away from the sensor with a screwdriver though that wouldn't create enough vibration to set it off.

[427v8]

Gear drive? Ick
Maybe if you are running a drag only car, maybe.

A good double roller chain is more than enough for the 10 second + crowd

[rickykline]

what am i smoking? why do you want some??? PUFF PUFF pass... lol i know what frequencies are but can you give me an operation range for a knock sensor? i dont think there is one is there?

[bszopi]

It depends on the knock sensor, actually... Old PROMs have a KS filter installed on them. OBD-1.5 PCMs have a removable KS filter. I'm not sure about the OBD2 stuff. But needless to say, the filters are different between OBD1 and OBD1.5, because a KS meant for an OBD1.5 will trigger knock when mated with an OBD1 filter and vice versa. This is from experience...

EDIT: Check it out--> http://www.autoshop101.com/forms/h38.pdf

[Guest]

What are you smoking? Yes, they do. Any old vibration won't do it... if that was the case then the motor running at all would set off the knock sensor. Vibrations have frequencies you know. Thats all they are is frequencies. A heavy vibration is a longer wave length and smaller vibration is shorter. A heavy strike or an explosion makes a large frequency. The knock sensor looks for something that makes enough resonance in the block, hence if you hit it with a hammer it makes a metallic impact and sets off the knock sensor. That impact simulates detonation because it creates enough vibration to reach the threshold of the sensor just like an explosion in the cylinder would do. If you just tapped the back of the block away from the sensor with a screwdriver though that wouldn't create enough vibration to set it off.

I guess you haven't played with the genII 660 too much, where you could take a meduim sized screwdriver or small hammer and just tapping the plenum would cause the KS to become active and pull timing out. This could be seen at idle, and the engine would stumble, and drop in RPM.

I'll never even consider a gear drive, if I had a choice between a brand new gear drive and a used worn out chain, I'll take the chain. I've seen and heard of way too many problems in engines equipped with gears.

If I ever get back to building the FrankenBeast, I will be developing a belt drive for it, way more efficiant, lighter and if designed right, easier to make cam timing adjustmets .

[AaronGTR]

Nice to know... but you are correct, I haven't played around with the gen2 engine much. I've done all my modding on a gen3 engine and I can tell you it's knock sensor is far less sensitive. Newer engine, different sensor and pcm. They won't always behave the same.

[Guest]

Nice to know... but you are correct, I haven't played around with the gen2 engine much. I've done all my modding on a gen3 engine and I can tell you it's knock sensor is far less sensitive. Newer engine, different sensor and pcm. They won't always behave the same.

Take that and learn from it, only speak about what you know, don't assume that because one thing is one way, they all have to be that way. I learned that one a long time ago.

[Superdave]

I've had my pete jackson noisey drive in the T/A since 2002, never had any problems with it. Yes it's noisey but not that bad.

http://www.superdave81.com/AV/355-PeteJackson.wma

with the hood open you can hear it good, with normal driving i can't hear it unless the windows are down.

gear drives are dyno proven not to rob any power, i can see in a computer application being weary about the added noise though.

[AaronGTR]

Take that and learn from it, only speak about what you know, don't assume that because one thing is one way, they all have to be that way. I learned that one a long time ago.

Same goes to you on that. I never said I was speaking about all knock sensors, just mine. Not as many people are going to bother with an outdated gen2 engine. More people are modding gen3's now so we are more concerned with what the effects would be on a gen3. I was never considering what the effects on a gen2 would be for that reason. I was only taking about the gen3 from the start. Guess I should have been more specific.

[Young Whitey]

I always thought the knock sensor was set up to detect frequencies based on the bore size. I know on my old subaru if you swapped the 2.0 to the 2.5 blcok you had to modify the knock sensor sensitivity tables.