Welcome to the SR20 Community Forum - The Dash.
Register
SR20 forum logo

Thread: Detonation or Timing Chain? (Dyno Video)

+ Reply To Thread
Posts: 1-10 of 23
2011-10-24 18:18:40
#1
Detonation or Timing Chain? (Dyno Video)
As title says...what do you think the rattling noise is in the video?? detonation or timing chain or other? Why it might be timing chain? Because it's known to be loose. The sound is also quite loud. People there thought it was the timing chain, but wanted to see what others thought.





-G
Last edited by gomba on 2011-10-25 at 23-54-28.
2011-10-25 15:26:06
#2
Thoughts?
2011-10-25 15:37:24
#3
doesnt sound like timing chain
2011-10-25 16:13:47
#4
Need to get a closer vid from where it's coming from. Otherwise I can't tell..
2011-10-25 16:58:14
#5
I call detonation.
2011-10-25 20:08:57
#6
Originally Posted by Wayne
Need to get a closer vid from where it's coming from. Otherwise I can't tell..


no more videos exist
2011-10-25 20:19:58
#7
check the plugs that sounds like detonation. What did the dyno graph look like.
2011-10-25 20:29:36
#8
Originally Posted by cortrim1
check the plugs that sounds like detonation. What did the dyno graph look like.


I checked the plugs(a day or so after dyno..cold)..nothing seemed out of the ordinary. Gap was still the same on all 4 and no odd coloring.

It was quite audible. I heard it inside the car during the dyno and it's very noticeable on the video. I've been hearing this for a while, but wasn't so aware of it until the car was on a dyno in a closed space(easier to hear). I also wasn't sure what it was, I thought at first it was my boost solenoid clicking on and off but after hearing it it's either timing chain or pinging..I'd guess if it's been pinging this loud for so long my engine would pretty much be destroyed by now (it may be :/)

idk what boost this was at..my BC was all fucked up..dyno was a waste of money..maybe 12-15psi.

Last edited by gomba on 2011-10-25 at 20-37-55.
2011-10-25 20:35:52
#9
you need a graph that does not have the smoothing set to 5. This covers up detonation. Depending on the ecu timing will be pulled which make the graph have dips where the detonation is happening. check the plugs for black specs or divots around the electrode.
2011-10-25 20:40:49
#10
I had some detonation on my last motor but it was not audible. I knew it was there by reading the plugs. I verified the issue on the dyno and found I was running a little lean. I saw the result when I pulled the motor apart. piston 1 and 3 had spots on the edges.
+ Reply To Thread
  • [Type to search users.]
  • Quick Reply
    Thread Information
    There are currently ? users browsing this thread. (? members & ? guests)
    StubUserName

    Back to top