Quiet valvetrain?
11-08-2009, 06:00 PM
#1
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Quiet valvetrain? My ls1 has a torquer 2 cam, with 130# beehive springs, and upgraded pushrods. The valvetrain ticks a good bit, the quietest I've ever heard it is always right after I put new oil in it.
I think there may be a minor exhaust leak too, but I'm interested in knowing if there's anyway to make the valvetrain of a cammed car quieter?
I think there may be a minor exhaust leak too, but I'm interested in knowing if there's anyway to make the valvetrain of a cammed car quieter?
11-08-2009, 07:10 PM
#5
It's a result of higher springloads, aluminum heads, thinner wall exhaust, and more aggressive cam rates that cause you to be able to hear the valves slamming shut.
You can always try some sound deadener on the valve cover to quiet things down a little also, check you exhaust for any leaks.
You can always try some sound deadener on the valve cover to quiet things down a little also, check you exhaust for any leaks.
11-08-2009, 08:13 PM
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Mines get sounds noisy when I'm next to another car. The way to solve the problem is check the pushrods see if you can go down. My tuner had 7.4 hardened after my H/C/I swap and it was very noisy but he told me when I got it if it doesn't calm down any after that then let him know and he will change them to 7.35 cause he said it was very very close. So the noise didn't stop so I he changed them to 7.35 and it calm down the ticking alot. Another way is to drive fast and past everything and put a loud exhaust system on so it can talk to you. lol
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11-08-2009, 08:42 PM
#8
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bad lifter? I gave one lifter that is making a lot of noise. I was told you can put cadillac lifters in that are better than stock but still cheaper that aftermarket ones. Does anyone know the part nummber to them. It has had a cam swap but not sure what cam. It was done before I bought it.
11-08-2009, 10:05 PM
#9
My ls1 has a torquer 2 cam, with 130# beehive springs, and upgraded pushrods. The valvetrain ticks a good bit, the quietest I've ever heard it is always right after I put new oil in it.
I think there may be a minor exhaust leak too, but I'm interested in knowing if there's anyway to make the valvetrain of a cammed car quieter?
I think there may be a minor exhaust leak too, but I'm interested in knowing if there's anyway to make the valvetrain of a cammed car quieter?
11-09-2009, 05:54 AM
#10
GM noticed this and intentionally put a layer of insulation on the ls2 intake if I remember correctly. I'm planning on putting a layer of sound deadener on my FAST to see what it does. Putting sound deadener on the valve covers, along with shorter pushrods helped considerably.
11-09-2009, 10:25 AM
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Is it possible you have the PR lengths backwards? Going to longer pushrods should add pre-load to calm down the noise. Going to shorter rods will result in less preload.
11-09-2009, 12:06 PM
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Well to everyone who oppose you yall can take it for what it's worth but, when I had the 7.4 you could hear the noise with the hood closed standing next to the car and once he changed them to 7.35 you can't hear it standing next to the car but when, I'm parked next to a car or driving next to a car you can hear the sewing machine. My heads where ported and milled and I'm not for sure what gaskets he used. All in all it quieted mine down, if you have a 100 laying around and you do it yourself it may be worth a try IMO.
11-09-2009, 12:54 PM
#17
Pushrod length should not be a guessing game. The only way to properly select a pushrod length is using an adjustable pushrod to observe the rocker arm contact on the valve stem. I dare say a lot of valvetrain failures could be prevented by proper geometry measurements and parts selection. Instead, the rocker arm or lifter manufacturer gets blasted on the forums. I would shy away from a mechanic that is just experimenting with pushrod lengths at your expense. A long term affect can be premature failure of valve guides due to extra valve stem side loading.
11-09-2009, 01:43 PM
#18
If the pushrod is too long, you'll actually bottom out the lifter as the lifter starts to rise on the cam lobe. It's a hydraulic lifter, so it's going to compress some under load. If the pushrod is too long, you run the risk of it bottoming out.
Just like stated above, pushrods shouldn't be a guess, they should be measured. If you're using stock rockers you don't have to worry about geometry because the pushrods won't change that.
Just like stated above, pushrods shouldn't be a guess, they should be measured. If you're using stock rockers you don't have to worry about geometry because the pushrods won't change that.
