1.66rr
Thread Starter
Instructor
Joined: Mar 2003
Posts: 158
Likes: 0
From: Greenwood Indiana
Well, here's an update. I went to the little ba$tard that was making noise and pulled off the new 1.6rr and put the stock 1.5 rocker back on. Quiet as a mouse now.
Of course, I have the same problem on the passenger side, so I'm going to move over there and see if I can find the noisy lifter over there. I'll try the same thing and see if that fixes the problem.
Bad rockers or weak lifters????
Of course, I have the same problem on the passenger side, so I'm going to move over there and see if I can find the noisy lifter over there. I'll try the same thing and see if that fixes the problem.
Bad rockers or weak lifters????
!["swamp rat"'s Avatar](data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 50 50'><circle class='avatar-circle-default' fill='%2391a5cf' cx='25px' cy='25px' r='20px'></circle><text class='avatar-text-default' x='49%' y='53%' fill='white' text-anchor='middle' alignment-baseline='middle'>"</text></svg>)
Instructor
Joined: Jan 2009
Posts: 151
Likes: 0
Well, here's an update. I went to the little ba$tard that was making noise and pulled off the new 1.6rr and put the stock 1.5 rocker back on. Quiet as a mouse now.
Of course, I have the same problem on the passenger side, so I'm going to move over there and see if I can find the noisy lifter over there. I'll try the same thing and see if that fixes the problem.
Bad rockers or weak lifters????
Of course, I have the same problem on the passenger side, so I'm going to move over there and see if I can find the noisy lifter over there. I'll try the same thing and see if that fixes the problem.
Bad rockers or weak lifters????
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
How'd the inspection of that one little - whatever you called it - turn out? Any sign of hitting or any witness mark?
If no sign of interference, I'm now wondering how noisey is really "noisey". If you expect rollers to be as quiet as the stockers, I wish you luck; most aren't.
As i said, GM went with a modified knock module when they went to roller rockers on the LT4. There has to be a reason they did that.
I'd hate to see have to go through all the work and expense to change all the lifters only to end up with the same situation.
In fact, I've read that the second most common cause of flat tappet camshaft failure is new lifters on a used cam. The first being reusing old lifters on a new cam.
You could still swapping them around, hoping to find the sweet spot.
Jake
West Point ROCKS!
If no sign of interference, I'm now wondering how noisey is really "noisey". If you expect rollers to be as quiet as the stockers, I wish you luck; most aren't.
As i said, GM went with a modified knock module when they went to roller rockers on the LT4. There has to be a reason they did that.
I'd hate to see have to go through all the work and expense to change all the lifters only to end up with the same situation.
In fact, I've read that the second most common cause of flat tappet camshaft failure is new lifters on a used cam. The first being reusing old lifters on a new cam.
You could still swapping them around, hoping to find the sweet spot.
Jake
West Point ROCKS!
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
I only included that remark because many times when responses like mine are posted, I'd see a flood of responses to the tune of "Well, I've been doing so and so since Hector was a Pup with no problem", etc.
We all probably know how many guys just love to defend their decision. I just didn't want to get off-topic and foster a debate about which preload setting is best, that's all.
No offense intended.
Jake
West Point ROCKS!
We all probably know how many guys just love to defend their decision. I just didn't want to get off-topic and foster a debate about which preload setting is best, that's all.
No offense intended.
Jake
West Point ROCKS!
Thread Starter
Instructor
Joined: Mar 2003
Posts: 158
Likes: 0
From: Greenwood Indiana
I did not see anything really out of line with the RR that I took off. Weird..but with the stock rocker arm on there the whole system is quiet as can be. I'll probably order a new push rod and get the 1.6 RR replaced and try to install it again. If not, 15 out of 16 RRs isn't bad!!
I did not replace the lifters when I replaced the rockers..I'm on the same page with Cam failure. I will probably replace the cam and rockers in the future, but I would at least like to avoid that until the economy improves.
I did not replace the lifters when I replaced the rockers..I'm on the same page with Cam failure. I will probably replace the cam and rockers in the future, but I would at least like to avoid that until the economy improves.
Le Mans Master
Joined: Dec 2006
Posts: 5,139
Likes: 482
From: H-Town Texas
I didn't see in your original post, did you replace the springs when you did the rocker swap? I'm not for sure, but it seems that by not going with a new stiffer spring, you could be experiencing a little coil bind or perhaps there isn't spring pressure causing the lifters to "hop" on the camshaft a little bit?
I just mention this because in just every thread about swaping to bigger RR's in the LT1's it is always mentioned to change springs for this reason.
I just mention this because in just every thread about swaping to bigger RR's in the LT1's it is always mentioned to change springs for this reason.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
I did not see anything really out of line with the RR that I took off. Weird..but with the stock rocker arm on there the whole system is quiet as can be. I'll probably order a new push rod and get the 1.6 RR replaced and try to install it again. If not, 15 out of 16 RRs isn't bad!!
I did not replace the lifters when I replaced the rockers..I'm on the same page with Cam failure. I will probably replace the cam and rockers in the future, but I would at least like to avoid that until the economy improves.
I did not replace the lifters when I replaced the rockers..I'm on the same page with Cam failure. I will probably replace the cam and rockers in the future, but I would at least like to avoid that until the economy improves.
Jake
West Point ROCKS!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
