H/C Ticking
Thread Starter
Burning Brakes
Joined: Nov 2006
Posts: 892
Likes: 1
From: Pittsburgh PA
H/C Ticking
Well I did H/C and upgraded the valvetrain of my corvette including lifters..
Now I know of the typical sewing machine noise but there is a certain instance from around 1400-1200 RPMS as the car slows down the ticking is slightly different.
Is this knock, because I don't know the actual noise of knock Im just worried because it is slightly louder at those RPMs.
It is not super loud though as the windows must be up and radio off.
Thanks, Cody
Now I know of the typical sewing machine noise but there is a certain instance from around 1400-1200 RPMS as the car slows down the ticking is slightly different.
Is this knock, because I don't know the actual noise of knock Im just worried because it is slightly louder at those RPMs.
It is not super loud though as the windows must be up and radio off.
Thanks, Cody
Race Director
Joined: Jun 2004
Posts: 19,459
Likes: 48
From: Schaumburg IL
CI 7-8-9-11 Veteran
St. Jude Donor '06-'10, '13
Well I did H/C and upgraded the valvetrain of my corvette including lifters..
Now I know of the typical sewing machine noise but there is a certain instance from around 1400-1200 RPMS as the car slows down the ticking is slightly different.
Is this knock, because I don't know the actual noise of knock Im just worried because it is slightly louder at those RPMs.
It is not super loud though as the windows must be up and radio off.
Thanks, Cody
Now I know of the typical sewing machine noise but there is a certain instance from around 1400-1200 RPMS as the car slows down the ticking is slightly different.
Is this knock, because I don't know the actual noise of knock Im just worried because it is slightly louder at those RPMs.
It is not super loud though as the windows must be up and radio off.
Thanks, Cody
Drifting
Joined: Jul 2001
Posts: 1,312
Likes: 2
From: Lake Havasu City AZ
Thanks,
Mike V
Last edited by MikeV; Jul 29, 2008 at 03:14 PM.
Thread Starter
Burning Brakes
Joined: Nov 2006
Posts: 892
Likes: 1
From: Pittsburgh PA
Im new to all the mechanicals but managed to do a bunch, but I have yet to hear a knocking motor, I'm just hoping Im just paranoid because I went on youtube and listened to some videos with engine knock and mine wasn't as loud or violent. Mine is more sewing machine.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Le Mans Master
Joined: Jul 2005
Posts: 7,405
Likes: 353
From: New Castle Del.
St. Jude Donor '09
Drifting
Joined: Jul 2001
Posts: 1,312
Likes: 2
From: Lake Havasu City AZ
Thread Starter
Burning Brakes
Joined: Nov 2006
Posts: 892
Likes: 1
From: Pittsburgh PA
Yes pushrods are the correct length. I just don't know if it is paranoia because the difference between the typical valvetrain noise and this occassional tick is just slightly different.
Le Mans Master
Joined: Jul 2005
Posts: 7,405
Likes: 353
From: New Castle Del.
St. Jude Donor '09
Drifting
Joined: Jul 2001
Posts: 1,312
Likes: 2
From: Lake Havasu City AZ
Racer
Joined: Dec 2005
Posts: 287
Likes: 2
From: Bay Area California
Getting back on topic...
Did the H/C, intake and header change late last year and yes, the mechanical noise from the engine increased, including some very moderate "ticking" at lower RPM. I do have true roller rockers which also tend to make a bit more noise. And, the mechanical noises are more pronounced when the cabin is closed up in my vehicle too. FYI, there was a post within the last two weeks in which the forum member gave a very good common sense comparison of the sound differences of a "tick" and a "knock" -- a search should find that easily. Trust this is useful...
A1
Did the H/C, intake and header change late last year and yes, the mechanical noise from the engine increased, including some very moderate "ticking" at lower RPM. I do have true roller rockers which also tend to make a bit more noise. And, the mechanical noises are more pronounced when the cabin is closed up in my vehicle too. FYI, there was a post within the last two weeks in which the forum member gave a very good common sense comparison of the sound differences of a "tick" and a "knock" -- a search should find that easily. Trust this is useful...
A1
Team Owner
Joined: Jul 2004
Posts: 124,404
Likes: 288
From: .... NJ
Cruise-In VII Veteran
St. Jude Donor '05 thru '19
I think it is just the typical ticking sound you get with heads, cam and headers. I first noticed it as well when I got mine done. It is most noticeable at the low RPMs with a small load that is with your foot just about on the gas.
I don't think it is knock because if the knock sensors are doing their job you should never be able to hear it.
I don't think it is knock because if the knock sensors are doing their job you should never be able to hear it.
Tech Contributor
Joined: Jan 2007
Posts: 19,465
Likes: 1,166
From: Dyer, IN
I got news for you sweetie, some guys don't have tuner close to them, and have to drive 270 miles to get work done and have their cars tuned. A supporting tuner offered his help, it's up to the OP if he wishes to make the drive or not. In this case, the OP is not even in town, but it was nice for Frans96SS to offer all the same.
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
At least you can ease your mind about engine knock. That only occurs under load. Since your tick/knock is during decel, it's not detonation. 
My car has a very loud wooshing sound that it didn't have before all my mods. I've been kind of worried there's a vacuum leak, but it's probably the thin-walled FAST, and attendant valvetrain noise. It's always something when you mod.
My car has a very loud wooshing sound that it didn't have before all my mods. I've been kind of worried there's a vacuum leak, but it's probably the thin-walled FAST, and attendant valvetrain noise. It's always something when you mod.
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
When you say the pushrods are the correct length, how did you determine that? I'm asking just in case the selling vendor gave them to you and said "they're correct" because that doesn't always cut it. Unless you used a pushrod length checker and used it properly, the pushrods are in question.