33* of Knock!

[SpeednV6]

Well, this should be on a kill site, however, I have a question.
I was crusing when a newer vette came up on me, I knew that he was itching to race. I let him get a 1/2 car in front of me and I noticed he punched it. I punched it too, and I must have kept my trans in Drive. The rpms jumped to double red line on the factory dash. I did not catch overdrive and I beat him by a few car lengths. He gave a thumbs up after the race. Because I overreved the motor, I looked at my Scanmaster and noticed 732 o2 volts and 33.1* knock. I had to look twice to make sure this was correct!!! I just finished putting on headgaskets, Do you guys think that I dameged the headgaskets?

Thanks

 

[NoNos38]

Sounds like a Scammaster brain fart. I am very suprised your motor is still alive if your knock was really that bad..

 

[salvageV6]

What speed did it occur at?

I'd check the drivers side motor mount.

I had 39* KR when mine was broken.

 

[SpeednV6]

I could not tell the speed that it occured. We raced, I won I took a peek at the SM and..33.1*. I just took the car out for a quick spin. I took a look at the oil, no coolant. I will monitor the coolant temp to make sure I do not have any pressure build up. I will have to check the motor mount as well. Last week, I got on it and broke the eyebolt to my engine tie down strap.

Salvage, when you got that kind of knock, did it do anything to your gaskets?

 

[REDS HOT AIR]

you will hear it at them levels for sure.. you can usually jear it good anything over 12 degrees

 

[Buick Mark]

What your seeing is how much timing the computer took out, its not really "Knock" that the tool is showing, its knock retard (timing) thats removed. If your showing that much timing retard, you need better gas or less boost Mark

 

[blackbuick87]

How fast were you going when you shut it down? anything over 110 in drive and you are getting into overrev range

 

[TurboDave]

Originally posted by SpeednV6
I could not tell the speed that it occured.

Sure you can. Next time you view the data with the button, push the other button at the same time and the numbers will change to the mph that the O2 and knock numbers were taken at.

 

[salvageV6]

When the motor mount was broken it created false knock.

Wasn't real at all in the motor so there is no headgasket damgage.

I am sure the ECM compensated with reduced timing and all but you normally don't hurt the engine with false knock.

If the bolt has broken on the tie down strap it may be due to a bad motor mount and the strap was doing all the work.

Open the hood put it in D in a safe open area with your foot on the brake hard. Then try to slowly put the gas down a bit.

If the engine moves out of the engine bay you've found your problem.

 

[LUZ_2_A6]

I can hear my knock when it is only at 2 or 3deg. I have seen outrageous KR numbers on my scanmaster also, up in the high 30's i think, i can't remember. It used to do it ever once in a while when i would punch from 70 or so, but i just ignored it since my motor was still running.

 

[BUICKTR]

I once got 19 degree knock on my stock engine. This is what my scanmaster read. Guess what it must of been right because I blew my headgaskets and spun a rod bearing. Don't know why it happened but it did. Make sure your have that octane and right chip.

 

[OneLethal87GN]

I know that no knock is safe, but at what levels does it start to become dangerous for the engine? My highest k.r. so far was about 8.9 and that was with 93 octane and about 20+ psi.