Lifter Video
04-22-2012, 11:50 PM
#1
Lifter Video Sorry, I didnt know how to edit my old post and just add this video
So I started a new one
I know you can hear the exhaust, but listen to the higher pitched noise. It's kinda in the backround of the exhaust noise
http://www.youtube.com/watch?v=VmPJ5...ature=youtu.be
So I started a new one
I know you can hear the exhaust, but listen to the higher pitched noise. It's kinda in the backround of the exhaust noise
http://www.youtube.com/watch?v=VmPJ5...ature=youtu.be
04-23-2012, 02:48 AM
#4
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Dear Ryan,
Thank you for proving my statement about how fickle and tempermental these cars can are. Especially when you mod the **** out of them.
-Cole
And to answer your question, does sounds like something is not quite right in the valuetrain. My guess as to the most likely cause is a spring is going out, bad rocker arm, or like you think, the lift is messed up.
Thank you for proving my statement about how fickle and tempermental these cars can are. Especially when you mod the **** out of them.
-Cole
And to answer your question, does sounds like something is not quite right in the valuetrain. My guess as to the most likely cause is a spring is going out, bad rocker arm, or like you think, the lift is messed up.
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04-23-2012, 04:54 PM
#11
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Get a bottle of GM EOS (Engine Oil Supplement), pour it in and see if the noise changes any. Pull the valve covers and check for any loose rocker arms (only takes about 10 minutes).
Has it always made this noise? If you are sure the lifter preload is correct (it may not be), I would go ahead and replace the lifters. Keep in mind that if the preload is off, the noise can get louder as the oil thins out and the components wear in, so it may be worth it to spend the $10 on the tool and double check.
Noises are hard to narrow down b/c they echo throughout the motor, exhaust, frame, etc. Good luck man.
Has it always made this noise? If you are sure the lifter preload is correct (it may not be), I would go ahead and replace the lifters. Keep in mind that if the preload is off, the noise can get louder as the oil thins out and the components wear in, so it may be worth it to spend the $10 on the tool and double check.
Noises are hard to narrow down b/c they echo throughout the motor, exhaust, frame, etc. Good luck man.
04-23-2012, 05:34 PM
#13
how hard would it be to take the belt off the maggie to see if that's making the sounds? i listened on my phone, but there's really nothing telling me you have a bad lifter (again, i listened on a phone speaker). I stole this from a website:
Try doing an adjustment on that rocker while the engine is running. Back it off until it really ticks, then take it down to where it doesn't tick (0 lash), then go another (however many recemmended turns) in 1/4 turn increments. After each 1/4 turn you'll have to wait for the lifter to recover. Time how long it takes for the engine to smooth out after each 1/4 turn. If its a few seconds, you have a lifter that is bleeding down too fast. If it takes 20-30 seconds thats a little more appropriate.
Try doing an adjustment on that rocker while the engine is running. Back it off until it really ticks, then take it down to where it doesn't tick (0 lash), then go another (however many recemmended turns) in 1/4 turn increments. After each 1/4 turn you'll have to wait for the lifter to recover. Time how long it takes for the engine to smooth out after each 1/4 turn. If its a few seconds, you have a lifter that is bleeding down too fast. If it takes 20-30 seconds thats a little more appropriate.
04-23-2012, 06:07 PM
#14
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You cannot do that on an LS motor, only the earlier SB chevy motors with adjustable stud mounted rocker arms. The LS rocker arm bolts have to be torqued to 22 ft. lbs and then measured with an adjustable pushrod length tool. Once you have this "zero lash" measurement, you have to add the lifter preload, usually in the range of 0.80" - .100" depending on what cam you are running.
I generally tend to go closer to 0.80" with more aggressive cams over .600" lift, but lobe design plays into this as well and will also greatly contribute to the dreaded "sewing machine" noise.
FYI - its pretty common for the OE LS lifters to take a **** after a cam has been installed (breeze through the GEN III internal engine section and see for yourself), if nothing else seems wrong (miss, etc) I think you are on the right track.
I generally tend to go closer to 0.80" with more aggressive cams over .600" lift, but lobe design plays into this as well and will also greatly contribute to the dreaded "sewing machine" noise.
FYI - its pretty common for the OE LS lifters to take a **** after a cam has been installed (breeze through the GEN III internal engine section and see for yourself), if nothing else seems wrong (miss, etc) I think you are on the right track.
Last edited by DMM; 04-23-2012 at 06:14 PM.
04-25-2012, 06:55 AM
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That sure sounds a little like what I had but could be anything. I'm assuming the sounds are new here.
Few things you can try to diagnose:
1. Get a metal bar/mechanic's stethoscope, put it on valve covers, heads etc to try to isolate the side
2. Listen to maggie, you can as suggested try to run the car a little with the belt off
3. Does the ticking increase with rpm consistently?
4. You can take the covers off and do a manual plunge test on each rocker.
5. Try a much heavier oil (think 50 weight) and see if it makes a difference in sound
What spring/cam combo are you running?
Few things you can try to diagnose:
1. Get a metal bar/mechanic's stethoscope, put it on valve covers, heads etc to try to isolate the side
2. Listen to maggie, you can as suggested try to run the car a little with the belt off
3. Does the ticking increase with rpm consistently?
4. You can take the covers off and do a manual plunge test on each rocker.
5. Try a much heavier oil (think 50 weight) and see if it makes a difference in sound
What spring/cam combo are you running?
