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AFM Destruction

Just an idea why

Re: AFM Destruction

Postby Bradley21sanders » Feb 13 2020, 8:27pm

Qualified mad scientist huh? ha

maybe I need to reverse engineer those plastic trays and make some that are stronger hmm
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Re: AFM Destruction

Postby MIKE91B [OP] » Feb 13 2020, 8:39pm

I’m going to do something with this idea. The goals are eliminate the rotation of the lifter and keep it cheaper than the $1000 tie bar lifters.
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Re: AFM Destruction

Postby DYNAMICAL » Feb 14 2020, 2:40am

Interesting...so youre thinking because of the special operation of the AFM lifter they are more susceptible to get loose in the tray = the problem?
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Re: AFM Destruction

Postby MIKE91B [OP] » Feb 14 2020, 3:38am

Yes an no. The plastic lifter tray contributes to more valve train failures than the AFM lifters. The AFM system creates enough problems. I’m just trying to eliminate wiping out a cam lobe while using non AFM lifters. When I take apart the other side of this LT1 I will be able to show how even the non AFM cylinders can rotate lifters in the trays. It has destroyed lobes on cylinder 6 and on 5. The AFM lifters are on a huge back order so this may take some time to go back together but I will show everyone the destruction on both banks of this engine. AFM and regular lifters can rotate and eat cams up.
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Re: AFM Destruction

Postby DYNAMICAL » Feb 14 2020, 1:27pm

Right, but wouldnt it be fair to say the average guy driving around with NON AFM wont see any problems? We've had these NON AFM engines running around forever. We hear about problems from AFM all the time. The guy in the vid obviously had a problem with the tray but I'm under the impression he put that 4.8 through hell with "testing". I'm assuming the original 4.8 he was using was NON AFM. If it was AFM lifters I bet there would of been a worse problem. I think its possible the AFM lifters magnify problems with the tray. This is good stuff thanks for posting, looking forward to seeing what else you come up with.
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Re: AFM Destruction

Postby GBSierraSLE » Feb 14 2020, 3:13pm

I'm wondering if there aren't different trays for different engines. Are the trays in a LS7 the same as those in a 4.8 truck motor?
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Re: AFM Destruction

Postby MIKE91B [OP] » Feb 14 2020, 4:28pm

There is a difference in the trays based on what generation the engine is and if it has afm. Also the LSX blocks use a lifter tray like this.
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Re: AFM Destruction

Postby DYNAMICAL » Feb 14 2020, 4:48pm

Thanks for that! Ever since I saw this thread iv been wondering about what was in my ls1 camaros. I owned a 98 z28, 99 z28
and 01 ss. First 2 lightly modded, ss was a 10.9 1/4 mile car. I know all ls engines had some tapping and such that nobody could ever figure out. Whats your opinion on the ls trays? Just curious, youre pretty knowledgeable.

MIKE91B wrote:There is a difference in the trays based on what generation the engine is and if it has afm. Also the LSX blocks use a lifter tray like this.
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Re: AFM Destruction

Postby MIKE91B [OP] » Feb 14 2020, 5:09pm

It seems that the early motors did not show near the failure rate. Somewhere about the time of the LS2 and LS3 this started from what I can gather. I heard the trays were changed but how or why is beyond me.
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Re: AFM Destruction

Postby MIKE91B [OP] » Feb 26 2020, 3:00pm

Even more evidence today. This is out of a 4.8l 2010 Sierra. It has 130000 miles and spun cylinder 6 lifter. Look at the tray it actually broke.
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