spark knock question

3

331 stang91

Member

Oct 16, 2004

261

0

16

wisconsin

May 22, 2005

#1

• May 22, 2005

• #1

Is spark knock something that is there or isn't or can it be very slight? The reason I ask is that I want to know how much I can push my motor without braking anything of course. Right now I have a very safe tune but wanted to advance the timing allitle. Will I definatly know is I have spark knock or can it be suttle. If it is very suttle wha tkind of damage can it due? I also ask because when I was playing with the timing the other day I thought maybe I heard a slight knock but it sounded more like a miss. Also a slight motor while in netural if i would rev the motor. I hope this makes sence sorry so long.

 

Funanin

Founding Member

Nov 26, 2001

356

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Horsham, Pennsylvania

May 22, 2005

#2

• May 22, 2005

• #2

detonation as far as i have seen is only there or not there. What you can do is have a buddy rev your motor up to about 4 or 5k and hold it there for a few seconds while u have your head under the hood and listen for any sort of pinging. If it is there you will hear it. Also it usually doesnt do it in neutral, you have to rev it up to hear it. You really should be using a timing light and setting it to around 14* max with 93 octane gas. Any higher and I would think it would start to ping.

 

3

331 stang91

Member

Oct 16, 2004

261

0

16

wisconsin

May 22, 2005

#3

• May 22, 2005

• #3

ya I have it at about 12 and was going to try 14 or 15 probablky willl go with 14 to be safe thatnks for the response

 

3

331 stang91

Member

Oct 16, 2004

261

0

16

wisconsin

May 22, 2005

#4

• May 22, 2005

• #4

The other thing is I thought I heard the knock at a steady speed but when I would race It would go away. So i probably wasn't hearing spark knock. I heard that flowmasters can make a missing kinda sound when crusing a a certain speed .

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

34

129

May 22, 2005

#5

• May 22, 2005

• #5

you need a load on the motor to hear detonation. I would not even bother being near detonation - a dyno pull should show you that you can go past the crest of the most beneficial timing and start to lose power (before detonation even onsets).

that is just me though. good luck.

 

3

331 stang91

Member

Oct 16, 2004

261

0

16

wisconsin

May 22, 2005

#6

• May 22, 2005

• #6

thanks

 

Funanin

Founding Member

Nov 26, 2001

356

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0

Horsham, Pennsylvania

May 22, 2005

#7

• May 22, 2005

• #7

didnt know that, thanks hissin.