Cascade Crew

Danked · Posted: Tue May 23, 2006 8:44 pm Post subject: crapppppppp

i took the valve covers off again *gasp* cant find any problems.. no broken push rods, no lifter problems, no rocker arms broken............... what do i do Confused

my dad said it COULD be a broken piston rod or something Sad

Xophertony · Posted: Tue May 23, 2006 9:09 pm Post subject:

it is intermittent right?

iansane · Posted: Tue May 23, 2006 9:29 pm Post subject:

There any way you can get a vid clip with the problem?

aaron_sK · Posted: Tue May 23, 2006 9:30 pm Post subject:

That's a good thing. Compression test it, and check for exhaust leaks.

Edit: Are you sure it's not detonating?

Danked · Posted: Tue May 23, 2006 10:48 pm Post subject:

well when i start it, it ticks, then i push the gas and the ticking goes faster, and faster, when its idling it barely ticks at all
no exhaust leaks, what do u mean not detonating? it'll start, i could get it to a local mechanic, but id rather not, and i dont have that kind of cash to spend since i plan on selling it within a few months anyways
i MIGHT be able to get a video clip of it, but id rather not put it back together AGAIN then take it back apart..

Xophertony · Posted: Tue May 23, 2006 11:04 pm Post subject:

our engines are "internal combustion" engines. combustion means burning. the air/fuel is compressed and then set on fire with spark. this RAPID combustion causes pressure which throws the piston down, creating power to move your 3000LB car.

"detonation" means EXPLOSION. this is caused by pressure. if your air fuel is warm (as it always is in your engine) and it is compressed too much for it's octain level it will detonate BEFORE the spark sparks, or when the engine sparks. this causes interesting issues.
1. decreased power. (due to bad "timing" sort of, see 2)
2. your "timing" means nothing, since spark no longer has anything to do with when your engine fires
3. it can bend piston rods if it's bad enough and eat holes in your pistons.

there are two reasons an engine will detonate (that i know of) the first is compression. our engines run 8.xx:1 that is prety low. i don't think you need to worry.

one way to fix this is to run premium fuel, since it has more octain it will be less prone top detonation. i don't know why but i am sure somone will fill us in

the second is timing, if your spark is after (retarded) the piston hits Top Dead Center (TDC) you will likely have detonation, or even if it is not far enough before (advanced) TDC.

to fix this check your timing. adjust.

hope this helps

aaron_sK · Posted: Wed May 24, 2006 5:48 am Post subject:

If you don't know whether or not it's detonating, I'd say set your timing back to stock, and throw in a bottle of STP octane boost. If that doesn't do it, try the compression check.

Twilightoptics · Posted: Wed May 24, 2006 8:04 am Post subject:

iansane · Posted: Wed May 24, 2006 8:29 am Post subject:

aaron_sK · Posted: Wed May 24, 2006 1:46 pm Post subject:

Xophertony · Posted: Wed May 24, 2006 4:57 pm Post subject:

QwkTrip · Posted: Wed May 24, 2006 5:23 pm Post subject:

Alright! This thread needs some clarification.

Nearly any engine is an internal combustion engine. Diesels are generally "compression ignition" engines. There is no spark plug. Your 3rd gens have a "spark ignition" gasoline engine. A spark plug is used to ignite the air/fuel mixture. Engine knock in a spark ignition engine occurs when there is sudden autoignition of the air-fuel mixture. The orderly combustion process becomes uncontrolled with a huge spike in cylinder pressure and release of heat. That can cause damage.

To prevent engine knock, the air-fuel mixture should have a low temperature, a low density, a long iginition delay, and either a lean or a rich air-fuel ratio. This means you will increase the likelihood of engine knock by,

1. Raising compression ratio, or supercharging
2. Raising inlet air temperature
3. Raising coolant temp
4. Raising temperature of combustion chamber walls, or opening up the throtte (increasing engine load)
5. Advancing the spark timing

The knock rating of a gasoline is found by matching the knock under prescribed conditions of operation in a special engine with specific reference fuels. Those fuels are n-heptane, with an octane rating of 0, and iso-octane, with an octane rating of 100. An octane rating of 89 indicates that a fuel has the same tendency to knock in a volume of 89 parts iso-octane and 11 parts n-heptane. The higher the octane rating the less susceptible the fuel is to autoignition.

At least that's what my internal combustion engineering book says.... you didn't think I knew all this crap, did you? Very Happy

Xophertony · Posted: Wed May 24, 2006 5:38 pm Post subject:

Danked · Posted: Wed May 24, 2006 5:44 pm Post subject:

my knocking sound is more like metal on metal, not just some simple gasoline problem solved by adding octane booster ~_~
gah i think im gonna just leave it like this, put it back together, drive it to the back of the yard, and leave it alone until someone comes over in 20 years and asks *you wanna sell that old thing back there?* Crying or Very sad

QwkTrip · Posted: Wed May 24, 2006 5:50 pm Post subject:

Xophertony · Posted: Wed May 24, 2006 5:51 pm Post subject:

Danked · Posted: Wed May 24, 2006 6:01 pm Post subject:

i just dont know what to do, and its bumming me out i wanna drive the camaro again Sad