Tapping motor
Thread Starter
8th Gear
Joined: May 2014
Posts: 8
Likes: 0
Tapping motor
Hello all,
I'm at my wit's end. Pulled my heads and replaced my lifers with LS7 lifters...nothing. The tapping continues. The tapping frequency traces the rpms (gets faster as the rpms go up). My rocker arms are adjusted. The strange thing is, I feel the tapping pulsating in my clutch and shifter. The only metal shavings I've found are on my magnetic oil drain plug. None in the bulk of my oil. My oil pressure is good even when driving around. It starts at 45 psi when cold and settles at 35psi when at ops temperature. It doesn't vary very much. I'm at a loss. Is it a spun bearing? Is it rod knock? Im at a loss.
HEEEELLLLPPP!!!!!
2007 Corvette LS2
My mods are:
SLP Blackwing intake
SLP Full exhaust
Nick Wilson 102mm Throttle Body
Fast LSXR Intake Manifold
Trickflow 235cc Heads
Harland Sharp 1.8 rocker arms
trick flow 7.400 pushrods
LS7 lifter (brand new)
Cam...Unknown
I'm at my wit's end. Pulled my heads and replaced my lifers with LS7 lifters...nothing. The tapping continues. The tapping frequency traces the rpms (gets faster as the rpms go up). My rocker arms are adjusted. The strange thing is, I feel the tapping pulsating in my clutch and shifter. The only metal shavings I've found are on my magnetic oil drain plug. None in the bulk of my oil. My oil pressure is good even when driving around. It starts at 45 psi when cold and settles at 35psi when at ops temperature. It doesn't vary very much. I'm at a loss. Is it a spun bearing? Is it rod knock? Im at a loss.
HEEEELLLLPPP!!!!!
2007 Corvette LS2
My mods are:
SLP Blackwing intake
SLP Full exhaust
Nick Wilson 102mm Throttle Body
Fast LSXR Intake Manifold
Trickflow 235cc Heads
Harland Sharp 1.8 rocker arms
trick flow 7.400 pushrods
LS7 lifter (brand new)
Cam...Unknown
Last edited by Rafman60; May 21, 2014 at 10:46 PM. Reason: update
Melting Slicks
Joined: Mar 2009
Posts: 2,321
Likes: 69
Its your bottom end bearings or crank might be on its way hey you never know, you seem that you could handle taking the oil pan down and looking also easy way is get am oil analysis done while the car is down.. But dont drive it anymore save the engine... I would also suspect the cam.. Can you pull the lifters and take a look at them also. Start from drain oil. Then pull oil pan inspect turn crank. Then pull heads and check lifters and valves.. Just my opinion I guarantee you will find the problem...
Last edited by RamAir972003; May 21, 2014 at 11:42 PM.
Thread Starter
8th Gear
Joined: May 2014
Posts: 8
Likes: 0
What does a loose timing chain sound like?
Melting Slicks
Joined: Feb 2001
Posts: 3,376
Likes: 4
From: Hershey, PA, USA
Cruise-In VI Veteran
St. Jude Donor '12
Did those rockers come with valve cover spacers? Pull your valve covers and see if the rockers are touching the silver baffle on the inside of the valve covers.
I know the Yella Terra's need additional space for the 1.8 ratio to clear. And it sounds like every rotation something is hitting. When I've heard rods or mains go they are a lower tone (yes, its hard to tell by the video) but this sounds like its on the top end for sure.
I know the Yella Terra's need additional space for the 1.8 ratio to clear. And it sounds like every rotation something is hitting. When I've heard rods or mains go they are a lower tone (yes, its hard to tell by the video) but this sounds like its on the top end for sure.
Last edited by C5kid; May 22, 2014 at 09:43 AM.
Melting Slicks
Joined: Nov 2013
Posts: 2,577
Likes: 68
From: Memphis Tn
Did those rockers come with valve cover spacers? Pull your valve covers and see if the rockers are touching the silver baffle on the inside of the valve covers.
I know the Yella Terra's need additional space for the 1.8 ratio to clear. And it sounds like every rotation something is hitting. When I've heard rods or mains go they are a lower tone (yes, its hard to tell by the video) but this sounds like its on the top end for sure.
I know the Yella Terra's need additional space for the 1.8 ratio to clear. And it sounds like every rotation something is hitting. When I've heard rods or mains go they are a lower tone (yes, its hard to tell by the video) but this sounds like its on the top end for sure.
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Race Director
Joined: Feb 1999
Posts: 12,772
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From: Indianapolis IN
the noise sounds high up like the push rods are too short, just my .02
Le Mans Master
Joined: Apr 2011
Posts: 7,820
Likes: 408
From: Montreal
St. Jude Donor '13
Did those rockers come with valve cover spacers? Pull your valve covers and see if the rockers are touching the silver baffle on the inside of the valve covers.
I know the Yella Terra's need additional space for the 1.8 ratio to clear. And it sounds like every rotation something is hitting. When I've heard rods or mains go they are a lower tone (yes, its hard to tell by the video) but this sounds like its on the top end for sure.
I know the Yella Terra's need additional space for the 1.8 ratio to clear. And it sounds like every rotation something is hitting. When I've heard rods or mains go they are a lower tone (yes, its hard to tell by the video) but this sounds like its on the top end for sure.
Tech Contributor
Joined: Oct 1999
Posts: 41,013
Likes: 9,775
From: Charlotte, NC (formerly Endicott, NY)
Noise is too fast for rod or bearing noise. Rod knock at idle is slower, deeper, louder and would occur on the power stroke of the affected cylinder which is every other revolution. Your tapping noise sounds more like it is in the top end. Almost sounds like a bunch of things aren't adjusted correctly so there is a lot of slop.
Bill
Bill
Thread Starter
8th Gear
Joined: May 2014
Posts: 8
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Yea I know...I'm hoping I can just undo the motor mounts and raise the motor 3/4s of an inch or so to get clearance. If not, then I will have to go through a days worth of *** pain.
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Oh, if it were only that easy. Unfortunately it's about a 5 hour job involving the dropping of the cradle and supporting the engine with either a hoist or support brace that most dealerships use.
Thread Starter
8th Gear
Joined: May 2014
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Damn...maybe I should just sell the vette and buy a honda fit. Hahaha
Supporting Vendor
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2024 C6 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (track prepared)
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