detination

Can somebody please define detination/tip in detination. I know its caused by not getting enough fuel, but what really happens to the engine? Is there anyway to detect this problem ahead of time? I don't know what happens, but it doesn't sound good! I'm about to install a revhard stage 2 kit on my 2000 Si and i really don't feel like buying or rebuilding an engine just yet. Any help on the topic would be great. :help:

try looking online for "detonation" (instead of "detination") and you might have better luck.

Originally posted by slate
Can somebody please define detination/tip in detination. I know its caused by not getting enough fuel, but what really happens to the engine? Is there anyway to detect this problem ahead of time? I don't know what happens, but it doesn't sound good! I'm about to install a revhard stage 2 kit on my 2000 Si and i really don't feel like buying or rebuilding an engine just yet. Any help on the topic would be great. :help:

Detonation (also known as ping or knock) is caused by a part such as the spark plug electrode getting so hot it ignites the air feul mixture before the piston is on the downward stroke, useualy it is on the upward stroke (known as the compression stroke) when detonation accurs. If you are tring to prevent it the best thing to do is make sure your feul system is able to handle the boost. Also don't run lean and don't go crazy with the boost. Also use 93 octane gas, this sometimes can help reduce the chance of detonation. Hope that helped!:D

perhaps you should look it up too. As far as I can tell, you've half-described pre-ignition, and half-described autoignition (knock). They're not the same, although preignition can lead to knock.

To summarize (and you should still look up more info), detonation occurs when the pressure & temperature within the cylinder get high enough to cause unburned charge to autoignite (compression-ignite). This auto-ignited charge burns simultaneously (instead of a little at a time), and a huge pressure spike results. This can be caused by a number of things, such as:
* spark timing that's too far advanced (fuel starts burning too early, and the pressure gets too high near TDC)
* compression ratio that's too high (cyl pressure gets too high on compression)
* too much boost (cyl pressure gets too high)
* poor charge cooling (cyl temp gets too high)
* low-octane fuel (octane rating reflects a fuels ability to resist knock)

Thanks guys that helps clear things up. I knew how to prevent detonation, just didn't know what exactly i was preventing, LOL. So I can detect detonation by a pinging or knocking sound? I really want to know before its too late. Thanks again for all your help.

You cannot always hear it happening.... Best thing is keeping a sharp eye on the condition of the plugs, for any warning that it's doing it...