Notices

# 2 cylinder detonation

 
Old 10-24-2010, 09:01 PM
  #1  
renvagn
User
Thread Starter
 
Join Date: Mar 2005
Posts: 1,056
Default # 2 cylinder detonation

# 2 cylinder in the track car was found to have a missing electrode and 1/2 it's insulator. Symptoms were an uncommon flatness on acceleration then an occasional miss with no real audible change until the car had cooled. At that point I suspect it went terminal.

Compression is good, and I didn't see anything upon scoping it. Pulling the ejector wire with the engine running is positive for decreased function then returns to normal once reinstalled.

Temps were in the 60's, 14 pounds of boost, 94 octane. So what do you think caused this??????

I am thinking I need to have the injectors flow tested or do you think visual inspection of the spray pattern if uniform with the other injectors would be sufficient. Thanks.
renvagn is offline  
Old 10-24-2010, 11:29 PM
  #2  
hp18racer
Addict
Rennlist Member
 
hp18racer's Avatar
 
Join Date: Apr 2006
Posts: 825
Default

I'd get the injectors flow tested, very cheap. http://www.lindertech.com/reconinj.htm

Also take a look at the wire harness for the fuel injectors. A problem with the wires to the injector could generate the same symptoms as a bad injector.
hp18racer is offline  
Old 10-25-2010, 09:29 AM
  #3  
Chris White
Addict
Rennlist Member

Rennlist Small
Business Sponsor

 
Chris White's Avatar
 
Join Date: Jul 2001
Location: Marietta, NY
Posts: 7,396
Default

That’s pretty bad detonation, I am surprised that the rings held up to that amount of abuse. Is the compression that same as all the other cylinders?

Could be the injector or the injector wiring. Also could be excessive oil in the intake – that will lower the effective octane of the fuel and increase combustion temperatures.
Chris White is offline  
Old 10-25-2010, 11:02 AM
  #4  
renvagn
User
Thread Starter
 
Join Date: Mar 2005
Posts: 1,056
Default

Chris,
Compression is from 1-4: 130+, 125, 130+, 110. In fact the # 4 looked to be the most carboned. I have had excessive oil use this year despite limited car use. I figured the engine is getting tired despite 57K of which 12-15 are track.
renvagn is offline  

Thread Tools
Search this Thread

Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: