Anyone have new lifters do this?? - Team Camaro Tech
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post #1 of 7 (permalink) Old Jan 12th, 06, 06:53 PM Thread Starter
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Angry Anyone have new lifters do this??

I'll try to make this as short as possible while still trying to make things clear.
350 motor, 1970 441 heads with 2.02's, screw in rocker studs, Crane full rollers rockers 1.5's. Mild Comp 270H cam, Stock springs, Bronze guides. Pretty basic. Since this motor was new I've had problems.
First 45 miles # 8 exhaust valve siezes in guide, (I'm thinking) and smacks piston, bends valve. Pull heads change piston, engine builder says valve guides little tighter than he likes & free's them up.
I bolt all back together.
11 miles later I'm hearing valve to piston again. Not over heating and has great oil pressure.
Pull heads & go to another machinist & explain. Different cylinder this time. Hmmm. Put steel guide in valve that bent to see what's up. (Experimenting) It was mild this time, just enough to knock it off it's seat & drop comp. to 50 lbs.

Bolt all back together. All's good. Put 159 miles on her pulling the Siskyious going to Medford Or. (Steeep climb)
Weeks later I think alls well and valve to piston rattle again!!

We're still thinking the valves are siezing in the guides. Only the exhaust valves are doing this.
We pull all the guides & go to steel and put new seals in. (the others rode up on the valve stem!?)
As I'm bolting all back together I decide to check all push rods.
Hmmm. I find 4 that are bent. 1 really bad.
I put new set in. All of them.
I adjust valves, but this time leaving them a little loose. (I'm kinda doing some experimenting now.) She fires right up, alls good.
I drive 5 miles and she's strong, just like the other times. But I notice some backfire a few times and big drop in power.
I pull the valve covers & hook up a remote starter switch so I can watch the rockers move.
HUHH??? As the rocker pushs the spring down & the valve open I stop rotation. And as soon as I do the rocker lifts back up and the valve is closing!! What? The lifters are bleeding down that fast! ALL OF THEM?
Looking at the row of rockers they're almost all in the same position after bleeding back up, or, the lifters bleeding down. You know what I mean.

Then the light bulb goes off. My valves are bending because They're adjusted too dam tight because they're not staying pumped up for me. (just long enough for me to get a bad adjustment without realizing it.)

THEN, for some reason 1 here and there decide to pump up and throw the valve too far bending a push rod etc. while I'm under load with my foot in it.

Has Anybody ever heard of such a thing as a bad set of new lifters? All of them? At once? I can understand a couple out of a batch but..... every one?

OR, are they having some sort of oil starvation. I'm shooting good oil to the rockers and have a nice steady oil pressure in the motor. But.....EVERY LIFTER?

Any thoughts or experience with this issue?
Yes, I'm buying a new set & put them in this week.

I think I can stop scratching my ***, er ah, I mean my head now. I hope.

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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post #2 of 7 (permalink) Old Jan 12th, 06, 07:54 PM
 
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Re: Anyone have new lifters do this??

I have never heard of all the lifters in a single engine going bad or being bad at once. Probably made on a Monday or Friday!!. I would be guessing by saying that maybe some part was left out of the lifter during assembly.
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post #3 of 7 (permalink) Old Jan 12th, 06, 08:43 PM
wdf
 
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Re: Anyone have new lifters do this??

I have heard of high bleed lifters-used to make a high lift cam mild at low rpm, this would efectivly shorten the duration also
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post #4 of 7 (permalink) Old Jan 12th, 06, 09:26 PM
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Re: Anyone have new lifters do this??

Sounds like you may have "coil bind" going on with the stock valve springs, have you checked for that?
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post #5 of 7 (permalink) Old Jan 12th, 06, 11:31 PM
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Re: Anyone have new lifters do this??

Quote:
Originally Posted by wdf
I have heard of high bleed lifters-used to make a high lift cam mild at low rpm, this would efectivly shorten the duration also
Ditto this sound to be more the case. At the low rpm you turning the engine over at the lifters may not even pump all the way up. Put a set of standard lifters hydraulic in,and replace the pushrods and you should be good to go.


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post #6 of 7 (permalink) Old Jan 13th, 06, 06:50 AM Thread Starter
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Re: Anyone have new lifters do this??

Quote:
Originally Posted by wdf
I have heard of high bleed lifters-used to make a high lift cam mild at low rpm, this would efectivly shorten the duration also

Hmm, like a Rhoads pump up lifter? That makes sense. It should've had stock lifters put in but.....? Maybe they got a set mixed up during a hangover the next morning, or a fat splib the night before.

The 2nd machinist checked the springs for coil bind & they're good.

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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post #7 of 7 (permalink) Old Jan 28th, 06, 05:28 PM Thread Starter
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Re: Anyone have new lifters do this??

Update: Put new lifters in and all seems good. These lifters aren't collapsing letting the valves close like the others. Sounds better & runs better.
Fingers are crossed. Only miles will tell.

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
stevo camaro is offline  
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