Valve Noise
09-10-2008, 09:09 AM
#1
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Valve Noise Need some help. I'm getting a lot of valve noise that I'd like to try and reduce. Here's my setup.
LS2
L92 heads ported, shaved .030" with .051" gasket (11.6:1 comp)
L76 intake, ported
throttle body ported
Cam is 232/236 116 lsa
Comp 921 springs
GM L92 rockers
hardened pushrods 7.40"
Comp R lifters (875-16)
Tuner says that the lifters called for .020 preload, but they set them to .050 to keep the noise down. I get ticking when cold and a lot of noise even when warm. A mild start on a quiet day is down right embarassing with all the racket coming from under the hood. The car makes good power (482 at the tuners shop, less elsewhere).
Any suggestions?
LS2
L92 heads ported, shaved .030" with .051" gasket (11.6:1 comp)
L76 intake, ported
throttle body ported
Cam is 232/236 116 lsa
Comp 921 springs
GM L92 rockers
hardened pushrods 7.40"
Comp R lifters (875-16)
Tuner says that the lifters called for .020 preload, but they set them to .050 to keep the noise down. I get ticking when cold and a lot of noise even when warm. A mild start on a quiet day is down right embarassing with all the racket coming from under the hood. The car makes good power (482 at the tuners shop, less elsewhere).
Any suggestions?
09-10-2008, 09:55 AM
#3
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Would there be any difference in power? Tuner says they like these lifters because they make better power. I don't understand how one lifter could make more than another.
09-10-2008, 12:08 PM
#4
I used LS7 lifters in my nearly identical build...and my preload was at 0.050". It is more quiet under the hood and driving than I think it was stock. Also used Yella Terras.
http://www.youtube.com/watch?v=aORkvjwg0ok
Gerry
http://www.youtube.com/watch?v=aORkvjwg0ok
Gerry
09-10-2008, 12:46 PM
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I used LS7 lifters in my nearly identical build...and my preload was at 0.050". It is more quiet under the hood and driving than I think it was stock. Also used Yella Terras.
http://www.youtube.com/watch?v=aORkvjwg0ok
Gerry
http://www.youtube.com/watch?v=aORkvjwg0ok
Gerry
09-10-2008, 02:43 PM
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I am running LSL lobes on my cam, .61x intake lift and .62x exhaust lift. My car makes hardly any valvetrain noise at all. Here is an idle video....at one point I walk up to the front of the car and you can tell there is almost no valvetrain noise. Stock lifters and Comp 912 springs
http://www.youtube.com/watch?v=16Yn34vuhC0
http://www.youtube.com/watch?v=16Yn34vuhC0
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09-10-2008, 02:49 PM
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I am running LSL lobes on my cam, .61x intake lift and .62x exhaust lift. My car makes hardly any valvetrain noise at all. Here is an idle video....at one point I walk up to the front of the car and you can tell there is almost no valvetrain noise. Stock lifters and Comp 912 springs
http://www.youtube.com/watch?v=16Yn34vuhC0
http://www.youtube.com/watch?v=16Yn34vuhC0
I'll have to get a video of mine idling cold and then hot. Not sure I can capture the noise as it's worse with a little load between 1500 and 2500 RPM.
09-10-2008, 04:04 PM
#11
I have been fooling with many LS Comp cams and the noise seems almost entirely related to the lobes. Comp seems to like the real aggressive ones cause they get the valve open fast but in my experience they are noisy and hard on components. Picture a lobe that looks like an equilateral triangle vs a sine wave.
09-10-2008, 04:50 PM
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I have LQ9 with the same heads, but mine our not milled. For .030" preload mine required pushrod lenght of 7.325". If geometry is not correct (to long of pushrods or too much preload) has caused noisey valvetrain is some of my other applications in the past.
09-11-2008, 01:54 AM
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ben diss,
remove your pushrods and check for grazing half way up,i had one not so long ago and the cheap pushrods were bending,making all the noise,i replaced the with manley pushrods and it was quiet as amouse.
cheers dave
vn commodore,iron 427,dd,11.28@128mph.
remove your pushrods and check for grazing half way up,i had one not so long ago and the cheap pushrods were bending,making all the noise,i replaced the with manley pushrods and it was quiet as amouse.
cheers dave
vn commodore,iron 427,dd,11.28@128mph.
09-11-2008, 06:53 AM
#16
I just happened to read a thread with the designers answer...
Nearly thirty years in this business... I have thick skin.
The SS-HT is a very popular choice right now. Though its design was considered a *custom* when it was first developed, it's proven history of success in many combinations, has made it more of a staple item on the FTI web site. Yes, you are correct that the lobes are custom, and it's not some XER "catalog spec" generated camshaft like other similar grinds. However, it is a very popular and proven design so maybe we'll call it a FTI catalog grind.
Those HPTS grinds you mention are just the typical cam profiles using the everyday Comp Cams or Lunati lobes. These are the grinds everyone has and as such, there's no real "tech support" required or even offered with them. These HPTS grinds will be offered soon once the HPTS E-store is up and running. Kind of a "cash and carry" type of operation my wife is going to handle. The FTI stuff will remain more high end products with full technical support whereas the HPTS pieces are more commodity items.
228*-232*-111* with just around .600" lift...
OK?
Ed
Nearly thirty years in this business... I have thick skin.
The SS-HT is a very popular choice right now. Though its design was considered a *custom* when it was first developed, it's proven history of success in many combinations, has made it more of a staple item on the FTI web site. Yes, you are correct that the lobes are custom, and it's not some XER "catalog spec" generated camshaft like other similar grinds. However, it is a very popular and proven design so maybe we'll call it a FTI catalog grind.
Those HPTS grinds you mention are just the typical cam profiles using the everyday Comp Cams or Lunati lobes. These are the grinds everyone has and as such, there's no real "tech support" required or even offered with them. These HPTS grinds will be offered soon once the HPTS E-store is up and running. Kind of a "cash and carry" type of operation my wife is going to handle. The FTI stuff will remain more high end products with full technical support whereas the HPTS pieces are more commodity items.
228*-232*-111* with just around .600" lift...
OK?
Ed
