OK, it may sound stupid, but it's a doubt that's been with me fore some time now, and I never found the right person to ask it.

Now, we all know, that knocking can be cause by several factors, but all of them, lead to cylinder pressure and temperature.

We also know, that too much timing can cause it, but my question is HOW?


Is it caused because the high cylinder pressures can make some air/fuel burn before the flame front reach it?
Or it is caused because the high cylinder pressures lead to high cylinder temperatures and after some cycles it can make it ignite before the spark?

Or both?





I got some books regarding engine tuning they should arrive soon. I've tuned my car in the dyno and got pretty good results, but it was a fairly easy motor to tune, as it is a 12:1 compression 84.7mm stroke B16A2 running ethanol, which is very knock resistant so it was not the biggest deal.

It run on stock TB+IM, blox B cams and ebay 4x1 header.


Made 176whp dynojet whp @ 8350rpm (not pushing further, crank was .50mm cut, lets save the bearings for now) which I consider good power for unported head, and cheap header.



But now this same engine is going to be rebuilt 1.9L with 14:1 CR, bisi header, performerX intake and some other upgrades so I want to learn as much as possible about the theory, so that I can tune it safely and get most power out of it.



If you have any imputs, I'll be happy to hear.


thanks HT

 

http://www.amazon.com/Internal-Combu...2781880&sr=8-4

Get a copy of that and it'll tell you everything you've ever wanted to know about knock and more.

I just read the section on knock a week ago and it is very helpful.

 

First of all, detonation appears after spark ignition, its explosion of unburned fuel in the combustion process, it can be cause by many factors, when fuel starts to burn/explode befor spark, its called pre-ignition, it can be caused by prior detonation, or wrong spark plugs, wires etc...

I got really nice info in attachments, download it!

Glad to help you with info 2x

 

Thanks!

This article was an amazing read.


It made it 100% clear in my mind now

 

I'm glad rep from you! :D