Engine experts, I need some help.

Shifter · 10-02-2001, 08:47 AM

In the spring when we first put the engine in and started it, it made a "load specific" noise. Kinda like a knocking sound, at least that's how I'd describe it. The noise is non-existant at idle, and it does not do it revving it. You can stand over the engine and listen, and rev it from idle to 6,000 and all you hear is exhaust and the sewing machine sound from the roller rockers, it sounds good and strong. It only does it when the engine is under heavy load-lower rpms(rolling in 4th gear at about 2500 rpm's and rolling into the throttle increasing as you push on the throttle.) the noise goes away after about 4,000 rpms. Since spring I figured it would get worse and show itself. If anything I think it has gotten less. However it is still there. Oil pressure is good(75psi warm, driving), I now have about 800 miles on it and a day at the track(12.40's at 115) and a bunch of back road pulls. Its weird and has most of the people around here puzzled.
Please give some advice.
Thanks, Lou

------------------
'89 LX, Carbed 331, AFR 185's, Tremec, 8.8 with moser guts and 4.10's....
'90 GT (Wife's car) Custom Bright Red, mach one hood, Drag Lite's, Mostly stock with an AOD.
Daily driver-gets about 26mpg.

silver_pilate · 10-02-2001, 01:15 PM

Maybe too easy....but possibly a small header leak?

I have a leak in the #4 cyl. (back passenger), but it makes a heavy "TCK" noise progressing to a sound similar to a bad pulley. At first you could only hear it under load conditions similar to what you described, but it progressed to being audible at idle over time.

I'm going to swap that gasket when I install my intake week after next.

Who knows...maybe?

--nathan

------------------
--silver_pilate

'91 GT, Built 306, Wolverine 1087 cam, ported Windsor Jr. Irons, and all the goodies...click the link to the left to see a full list of my mods...

Tried and True 302 Being Built to Outrun You! heh heh heh...
--Texas Panhandle--
Check out my site

[This message has been edited by silver_pilate (edited 10-02-2001).]

10-02-2001, 08:47 AM	#1
Shifter Registered Member Join Date: Oct 2001 Location: PA Posts: 1	Engine experts, I need some help. In the spring when we first put the engine in and started it, it made a "load specific" noise. Kinda like a knocking sound, at least that's how I'd describe it. The noise is non-existant at idle, and it does not do it revving it. You can stand over the engine and listen, and rev it from idle to 6,000 and all you hear is exhaust and the sewing machine sound from the roller rockers, it sounds good and strong. It only does it when the engine is under heavy load-lower rpms(rolling in 4th gear at about 2500 rpm's and rolling into the throttle increasing as you push on the throttle.) the noise goes away after about 4,000 rpms. Since spring I figured it would get worse and show itself. If anything I think it has gotten less. However it is still there. Oil pressure is good(75psi warm, driving), I now have about 800 miles on it and a day at the track(12.40's at 115) and a bunch of back road pulls. Its weird and has most of the people around here puzzled. Please give some advice. Thanks, Lou ------------------ '89 LX, Carbed 331, AFR 185's, Tremec, 8.8 with moser guts and 4.10's.... '90 GT (Wife's car) Custom Bright Red, mach one hood, Drag Lite's, Mostly stock with an AOD. Daily driver-gets about 26mpg.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Rare Mustangs....Got One?	1969Mach1	Blue Oval Lounge	22	09-25-2010 04:59 AM
Very bad experience with Engine Dynamics of San Jose CA	JAGraff	Classic Mustangs	8	06-16-2005 11:43 AM
Very bad experience with Engine Dynamics of San Jose CA	JAGraff	Small Ponies	0	05-12-1999 02:27 AM
Very bad experience with Engine Dynamics of San Jose CA	JAGraff	Racer's Club House	0	05-12-1999 02:27 AM

10-02-2001, 01:15 PM	#2
silver_pilate DURKA DURKA!! Join Date: Sep 1997 Location: Lubbock, TX...(TX panhandle) Posts: 1,418	Maybe too easy....but possibly a small header leak? I have a leak in the #4 cyl. (back passenger), but it makes a heavy "TCK" noise progressing to a sound similar to a bad pulley. At first you could only hear it under load conditions similar to what you described, but it progressed to being audible at idle over time. I'm going to swap that gasket when I install my intake week after next. Who knows...maybe? --nathan ------------------ --silver_pilate '91 GT, Built 306, Wolverine 1087 cam, ported Windsor Jr. Irons, and all the goodies...click the link to the left to see a full list of my mods... Tried and True 302 Being Built to Outrun You! heh heh heh... --Texas Panhandle-- Check out my site [This message has been edited by silver_pilate (edited 10-02-2001).]