knock please? - Subaru WRX Forum
LinkBack Thread Tools Display Modes
post #1 of 2 Old 10-10-2005, 08:46 PM Thread Starter
WRXtuners Member
NickCParker's Avatar
Join Date: Jun 2005
Location: Washington
Posts: 62
Send a message via AIM to NickCParker
knock please?

SO.. i searched the forums about knock and found that knock occurs when your a/f ratio is running lean. aka not enough fuel? correct? anywho. what actually happens because of knock? i still dont understand whats going on really?

knock most commonly happens when you dont monitor / upgrade your fuel systems w/ mods riiight???

thanks for your time
NickCParker is offline  
Sponsored Links
post #2 of 2 Old 10-10-2005, 09:40 PM
Vew's Avatar
Join Date: Feb 2004
Location: West Virginia
Posts: 3,487
Images: 10
Send a message via AIM to Vew
Basically, the idea behind turbocharged cars work is the more air you can put into the cylinder, the more fuel you can put in. That in turn gives you more bang, which means more power. The problem with this is that if we take a look back at chemistry, we learn that as pressure increases (more air the cylinder), temperature increases.

What happens is that it gets so hot, it detonates before the spark plug can do it's thing. Thus knock. It can be very damaging to an engine, which is why we have intercoolers, higher octane (more resistance to burning), and whatnot.

Adding more fuel is an easy way to cool down the temperatures. A bigger intercooler, water/methenol injection, lowering the pressure are a few other ways.

A side note, a smaller turbocharger (less lag) will generate more heat than a larger turbocharger because the smaller turbo has to work harder to pump in all that air.

This is also a good read.

Subaru Ambassador
Vew is offline  

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome