72 lifter noise
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Instructor
Joined: Jul 2007
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72 lifter noise
I have a recently rebuilt 72 350 that has had valve train noise since the rebuild. I have adjusted the valves several times and they still get loud when the temp comes up. I am planning to replace the lifters but am not sure if I can do that with the old cam (Break in ?) I have 9.75:1 pistons,original heads slightly ported, stock intake, carb and exhaust manifolds. How much cam can I put in it if I change cam and lifters? need sugestions.
Thanks
Thanks
Burning Brakes
Joined: Aug 2005
Posts: 1,164
Likes: 1
From: Europe, France
If your lifters are worn, the camshaft lobes are probably too.
It wouldn't be a good idea to replace all lifters and keep the old camshaft.
You say the lifters get noisy when the engine temp comes up.
Do you have enough oil pressure ? How much ? What is your oil viscosity ?
It wouldn't be a good idea to replace all lifters and keep the old camshaft.
You say the lifters get noisy when the engine temp comes up.
Do you have enough oil pressure ? How much ? What is your oil viscosity ?
Last edited by 73StreetRace; Oct 5, 2009 at 10:27 AM.
Burning Brakes
Joined: Dec 2008
Posts: 971
Likes: 45
From: Middlesex NJ
You cant use new lifters on an old cam or vice versa... unless its a roller cam. You will destroy the cam.
Sounds like your oil pressure is too low when the oil is heated up. Possible that the builder forgot to put the lifter gallery plugs in behind the timing chain.
Not sure what all was done to the motor and if its all the lifters after the engine heats up then something has changed for the worse since the rebuild.
Sounds like your oil pressure is too low when the oil is heated up. Possible that the builder forgot to put the lifter gallery plugs in behind the timing chain.
Not sure what all was done to the motor and if its all the lifters after the engine heats up then something has changed for the worse since the rebuild.
Thread Starter
Instructor
Joined: Jul 2007
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base engine. Its not all the lifters but sounds like a few on the left bank. The sound is more evident from under the car for some reason, maybe an echo but when its cold its as quiet as a church. I'm pretty sure its not exhaust because I can here it by the valve cover. New oil pump and oil pressure hot is 35psi.
Burning Brakes
Joined: Aug 2005
Posts: 1,164
Likes: 1
From: Europe, France
What method did you use to adjust the valve lash ?
Cold engine, set to zero lash and then 1/2 turn more on the nut ?
There are other methods you could try, for instance with engine running, just to be sure valve lash is correctly set on all cylinders.
With engine running you can hear the difference immediatly and easily determine which lifters are noisy.
Cold engine, set to zero lash and then 1/2 turn more on the nut ?
There are other methods you could try, for instance with engine running, just to be sure valve lash is correctly set on all cylinders.
With engine running you can hear the difference immediatly and easily determine which lifters are noisy.
Thread Starter
Instructor
Joined: Jul 2007
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I adjusted the first time with engine cold and not running zero lash and eighth turn. No change in sound! Then I added a 1/2 turn to all. Still no change in sound. Then this weekend I adjusted the left bank hot and running with a half turn ( the side where I here the noise) Still no change in sound. Its not really loud but it is not right! One or two are louder than the others although I can't tell which they are.
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Burning Brakes
Joined: Dec 2008
Posts: 971
Likes: 45
From: Middlesex NJ
I did a little searching on the web and found several indications that if the lifters get noisy at idle while hot it indicates the plunger is scoured or some other issue with the lifter and the lifter is leaking down too quickly.
I still find it odd that your indication seems to be all of the lifters or at least allot of them.
Outside of the lifter gallery plugs missing from behind the timing chain, could you have very thin oil, too much oil (causing foaming) etc. I've also heard plenty of leaky headers that can sound like terrible engine problems.
I still find it odd that your indication seems to be all of the lifters or at least allot of them.
Outside of the lifter gallery plugs missing from behind the timing chain, could you have very thin oil, too much oil (causing foaming) etc. I've also heard plenty of leaky headers that can sound like terrible engine problems.
Thread Starter
Instructor
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I changed oil pumps and it made no differance but its not all the lifters. I can hear them all slightly but only one or two are noticeable to the novice. the oil is 10w-30 Brad Penn racing oil. I used the Brad Penn 30w break-in oil when I first started the engine as well as GM EOS for the first 75 miles. If it was a wiped lobe wouldn't it have a miss and be loud all the time? When its cold I can't hear any valve train noise. When its hot I can hear all the lifters slightly but most people would say they can't as there not very noticable except for a few(the few that ar driving me nuts!).
Burning Brakes
Joined: Aug 2005
Posts: 1,164
Likes: 1
From: Europe, France
I remember that I used an oil additive called "Bardahl Hydraulic Valve Lifter Treatment" a few years ago, which was very efficient concerning lifters noises.
It's a small bottle ( 300ml ) you just add to the motor oil.
As they say on the notice :
Bardahl Hydraulic Valve Lifter will ensure that the critical lubrication channels are kept free of gum and varnish,
thus allowing a continuous flow of oil.
Using this product:
•Dissolves and eliminates deposits throughout the whole engine.
•Reduces engine noise generally but the upper cylinder area in particular.
•Forms a protective anti-wear film on valve lifters, valve stems for reduced friction and greater efficiency.
•Extends engine life generally.
•Will not block the oil filter and increases oil flow throughout the engine in general.
•Suitable for use in both petrol and diesel lubricants.
•Suitable for all types on engine, diesel, common rail, LPG and high pressure petrol engines with or without turbochargers.
You can find the home page here :
http://www.bardahl.se/sidor/produkte...tillsatser.htm
It's not very expensive so perhaps it's worth a try before removing anything...
It's a small bottle ( 300ml ) you just add to the motor oil.
As they say on the notice :
Bardahl Hydraulic Valve Lifter will ensure that the critical lubrication channels are kept free of gum and varnish,
thus allowing a continuous flow of oil.
Using this product:
•Dissolves and eliminates deposits throughout the whole engine.
•Reduces engine noise generally but the upper cylinder area in particular.
•Forms a protective anti-wear film on valve lifters, valve stems for reduced friction and greater efficiency.
•Extends engine life generally.
•Will not block the oil filter and increases oil flow throughout the engine in general.
•Suitable for use in both petrol and diesel lubricants.
•Suitable for all types on engine, diesel, common rail, LPG and high pressure petrol engines with or without turbochargers.
You can find the home page here :
http://www.bardahl.se/sidor/produkte...tillsatser.htm
It's not very expensive so perhaps it's worth a try before removing anything...
Last edited by 73StreetRace; Oct 6, 2009 at 05:11 AM.
