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03-15-2024
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#1 |
 
Join Date: Jul 2004
Location: Kalamazoo MI
Posts: 1,738
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Any Idea what that noise is?
Looking for opinions what do you hear?
It is a DRM 500 package top end ported It has aftermarket connecting rods, after market pistons marked PMI388/I not sure about the cylinder liners, and I am pretty sure it had Nitrous run on it from the holes drilled in my storage compartment. I have no idea the abuse this engine had prior to me getting it but it has been fine for 19 years with a couple of misfire issues here and there. I have been driving it as a daily for years and it has always puffed a little oil smoke. I know I have something going on so im not to worried about it just want to figure it out before I yank it out. Video https://www.youtube.com/watch?v=5V4tnQdGc6Q I had Amsoil 10w40 high zinc in it put in last spring. I checked all over the place with my mechanic stethoscope couldn't really isolate it. Oil pressure was still good Last compression test was good but I have not checked it yet. I am pulling the oil pan to check for anything obvious I'm guessing a rod bearing. lifter? piston ring? piston slap or a rod knock. I cut open the oil filter and I have small ferrous metal in the filter not a lot but some. Anyway why do you all think it is?
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JOHNNY P Currently own 90 ZR-1 #845 DRM 500 engine package 90 #226 Might be a parts car not sure yet Last edited by phrogs; 03-15-2024 at 04:23 PM. |
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03-16-2024
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#2 |
 
Join Date: Apr 2007
Location: Northern VA
Posts: 2,644
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Re: Any Idea what that noise is?
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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03-16-2024
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#3 |
 
Join Date: Jul 2017
Location: West Chester, PA
Posts: 361
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Re: Any Idea what that noise is?
Seems to be one "tick" per engine revolution (i counted 15 ticks in about 2 sec at idle).
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1990 Black/Black ZR-1 #1155 1993 White/Red coupe (Regrettably sold) 
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4 Weeks Ago
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#4 |
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Join Date: Mar 2024
Location: Northeast
Posts: 9
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Re: Any Idea what that noise is?
The ticking noise sounds sort of like an exhaust leak. Does it go away when it warms up?
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4 Weeks Ago
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#5 |
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,186
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Re: Any Idea what that noise is?
when my 90 was stock it made that noise 90-966, and when I put a different engine in it made the same noise.... 90-702 motor. There were some cam noise issues on 90s, I never figured it out on my car.... and it never showed knock.
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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4 Weeks Ago
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#6 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,186
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Re: Any Idea what that noise is?
Noise also came and went w/weather...
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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4 Weeks Ago
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#7 |
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Join Date: Jul 2004
Location: Kalamazoo MI
Posts: 1,738
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Re: Any Idea what that noise is?
well I found my knock sensor plug melted still have to check if that may be part of it.
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JOHNNY P Currently own 90 ZR-1 #845 DRM 500 engine package 90 #226 Might be a parts car not sure yet |
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4 Weeks Ago
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#8 |
Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,030
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Re: Any Idea what that noise is?
Johnny, maybe it just as simple as this... --Bob
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2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" |
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3 Weeks Ago
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#9 | |
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Join Date: Jul 2004
Location: Kalamazoo MI
Posts: 1,738
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Re: Any Idea what that noise is?
Quote:
**** I wish. Lee mentioned a little thicker oil so I'm going to try that and see if it changes. I needed to fix a rear main seal leak and that pan gasket as well so almost ready to fire it up. So we'll see.
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JOHNNY P Currently own 90 ZR-1 #845 DRM 500 engine package 90 #226 Might be a parts car not sure yet |
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3 Weeks Ago
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#10 |
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Join Date: Jan 2024
Location: Boston, MA
Posts: 55
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Re: Any Idea what that noise is?
Totally different engine, but my L98 had a loose valve guide sound very similar to that clicking. I kept adjusting my rockers thinking one was loose.
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1987: Z51 Coupe, Z51, 4+3, Yellow / Graphite 1994: ZR-1 #150, Admiral Blue / Black 2015: Z06 Coupe, Z07, M7, Arctic White / Red |
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