Knock in New Engine?

***Ed Blown Vert*** · 09-27-2009, 02:31 PM

Still tuning the car. But have been hearing a knock from the engine. I first thought it was my exhaust hitting. But can't find anything wrong. I hope its not the engine.

When I bring the idle up, I can't hear it. So not sure it is the engine. but it sounds nasty.

Going to talk to the builder tomorrow.

[MEDIA]http://www.ls1.com/ed/engine/knock.wmv[/MEDIA]

**blackSS01** · 09-27-2009, 03:04 PM

Sounds like a rod knock to me and my buds. I don't know what to say... I would talk to him asap.

***Ed Blown Vert*** · 09-27-2009, 04:29 PM

God I hope not. Shouldn't the knock speed up with the engine?
When I rev it, it gets quiet. The tune isn't quite there yet, so the idle is very rough.
I was thinking something was hitting.

**Smittro** · 09-27-2009, 04:35 PM

All I can hear is a sqweeky belt or a bad vac leak..

***Ed Blown Vert*** · 09-27-2009, 05:01 PM

That damn blower and bypass valve.

**Hi-Po** · 09-27-2009, 05:32 PM

Originally Posted by Smittro

All I can hear is a sqweeky belt or a bad vac leak..

Originally Posted by Ed Blown Vert

That damn blower and bypass valve.

That never stops being funny to me

If it was a knock, it would 9/10 increase with engine RPM. I can barely hear it over the whine actually. Im sure its more loud in person. Really need to get that engine builder in person to listen to this.

**blackSS01** · 09-27-2009, 05:36 PM

Didn't read your whole post until now, but if you rev it up and the knock goes away, then it wouldn't be a rod. Builder asap and then back to report to us asap

***Ed Blown Vert*** · 09-27-2009, 05:58 PM

I am thinking its not a Rod. But damn, in person it sound nasty.
I just uploaded another tune and my idle is much better. So the engine isn't shaking as much. So that knock isn't as profound.

Still going to talk to the builder.

**Hi-Po** · 09-27-2009, 06:25 PM

How many miles on this current shortblock Ed? Is this the same shortblock you had oil pressure issues with a while ago? After being able to turn my volume up more, I do hear it... and it sounds nasty. Did the builder give you the bearing clearances that he got? Its weird that a different file made the 'knock' more quiet. You sure nothing is hitting?

***Ed Blown Vert*** · 09-27-2009, 06:31 PM

About 100 miles. Same engine, different block and springs.

No I am not sure, I am still hoping something is just hitting. But not sure where it is.

The different file made the engine smoother at idle. So less shaking.