Pretty sure I found knocking noise - pics inside
#1
Pretty sure I found knocking noise - pics inside
I've made a few posts about a knocking sound coming from the bottom end of my Nutek 396. Here's the history of this problem:
http://web.camaross.com/forums/showthread.php?t=444059
http://web.camaross.com/forums/showthread.php?t=450783
http://web.camaross.com/forums/showthread.php?t=462667
http://web.camaross.com/forums/showthread.php?t=468293
Basically, the noise was faint when the motor was cold. When the motor would warm up to operating temp, the noise would get louder and was very consistent. After replacing header gaskets, swapping injectors, adjusting rockers, switching back to stock rockers, unplugging plug wires/injectors, etc. I think I have finally found the noise:
Click Here
The 'knicks' line up exactly with the #4 and #6 connecting rods, which is where the noise sounded like it was coming from. That is a Canton 7 Qt. oil pan, and it looks like the crank scraper needs to be clearanced a little for a 383/396.
I just wanted to verify that this is the noise I'm hearing. I can't imagine this ISN'T the noise, but just wanted to be 100% sure before I put it back together.
It looks like a few minutes with a dremel will fix the noise, and the bottom end is fine.
http://web.camaross.com/forums/showthread.php?t=444059
http://web.camaross.com/forums/showthread.php?t=450783
http://web.camaross.com/forums/showthread.php?t=462667
http://web.camaross.com/forums/showthread.php?t=468293
Basically, the noise was faint when the motor was cold. When the motor would warm up to operating temp, the noise would get louder and was very consistent. After replacing header gaskets, swapping injectors, adjusting rockers, switching back to stock rockers, unplugging plug wires/injectors, etc. I think I have finally found the noise:
Click Here
The 'knicks' line up exactly with the #4 and #6 connecting rods, which is where the noise sounded like it was coming from. That is a Canton 7 Qt. oil pan, and it looks like the crank scraper needs to be clearanced a little for a 383/396.
I just wanted to verify that this is the noise I'm hearing. I can't imagine this ISN'T the noise, but just wanted to be 100% sure before I put it back together.
It looks like a few minutes with a dremel will fix the noise, and the bottom end is fine.
Last edited by 97bowtie; 09-04-2006 at 08:10 PM.
#2
Re: Pretty sure I found knocking noise - pics inside
for that much crank i'm pretty sure your builder should have known to clear the block. i had clearance issues on my 383...sorry to say i'd bring it back to the builder and have them pay for everything.
#3
Re: Pretty sure I found knocking noise - pics inside
Originally Posted by Severous01
for that much crank i'm pretty sure your builder should have known to clear the block. i had clearance issues on my 383...sorry to say i'd bring it back to the builder and have them pay for everything.
#4
Re: Pretty sure I found knocking noise - pics inside
Originally Posted by SevenStars
Its looks like the block is fine, its just hitting the Canton pan... or am I missing something?
#6
Re: Pretty sure I found knocking noise - pics inside
i would say you have found your problem, i had to clearance my canton pan as well for my 383. I dont know why the sound would change based on temp though.
Scott
Scott
#7
Re: Pretty sure I found knocking noise - pics inside
Back in my ford days, We had to clearence a Canton pan on a 408 I had built. I was having the same issue. Just grind the spots back, clean it up and enjoy.
#8
Re: Pretty sure I found knocking noise - pics inside
Since it clearanced itself wouldn't the noise be gone? I know when people don't clear the pan for whatever reason it tends to make a nice dent in the pan and then the noise stops. I'd figure it'd be the same in this situation, no?
#9
Re: Pretty sure I found knocking noise - pics inside
Originally Posted by Black6spdZ
i would say you have found your problem, i had to clearance my canton pan as well for my 383. I dont know why the sound would change based on temp though.
Scott
Scott
#10
Re: Pretty sure I found knocking noise - pics inside
Originally Posted by ZBLKHELLRZR
Since it clearanced itself wouldn't the noise be gone? I know when people don't clear the pan for whatever reason it tends to make a nice dent in the pan and then the noise stops. I'd figure it'd be the same in this situation, no?
If the rods were striking the actual pan itself, what you say may be true.
#13
Re: Pretty sure I found knocking noise - pics inside
Originally Posted by JustNO
All Canton Pan need to be clearanced before installed on a 383 ?
#14
Re: Pretty sure I found knocking noise - pics inside
Oh then I hope my engine builder already done that.
97Bowtie: I just took a video, can you hear that noise?
BTW, I had a knock retard issue before I desentisized the knock module.
97Bowtie: I just took a video, can you hear that noise?
BTW, I had a knock retard issue before I desentisized the knock module.
Last edited by JustNO; 09-05-2006 at 03:28 PM.
#15
Re: Pretty sure I found knocking noise - pics inside
any decent engine builder will turn the engine over by hand a couple times before they put it in the car. It only makes sense to make sure you have everything right first.