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-   -   Flat tappet lifter failure (https://classracer.com/classforum/showthread.php?t=85341)

Terry Cain 07-26-2023 08:23 PM
Flat tappet lifter failure
 
1 Attachment(s)
Curious how many have had this problem regardless of reasoning in last 5 years or so.

GTX JOHN 07-27-2023 01:18 AM
Re: Flat tappet lifter failure
 
My boy has had issues that have cost engines while
running the expensive billet stuff.

Run to Rund 07-27-2023 09:34 AM
Re: Flat tappet lifter failure
 
Spring pressure and lifter diameter are factors as well. Stock lifters are good at 380 lb. open and .921" diameter. 500-550 lb. open are another story.

Gmirza 07-27-2023 08:51 PM
Re: Flat tappet lifter failure
 
I lost one cam lobe, I noticed it after about 100 runs. I’m not sure when it went away. Most likely caused by lack of oiling at low rpm. From what I’ve been told the tool steel lifter, cast cam combination is only good for maybe 200 runs if you’re lucky. Go fast stuff can be a P.I.T.A.

Paul Precht 07-27-2023 09:30 PM
Re: Flat tappet lifter failure
 
Quote:
Originally Posted by Gmirza (Post 683587)
I lost one cam lobe, I noticed it after about 100 runs. I’m not sure when it went away. Most likely caused by lack of oiling at low rpm. From what I’ve been told the tool steel lifter, cast cam combination is only good for maybe 200 runs if you’re lucky. Go fast stuff can a P.I.T.A.
Hi George, do you know what your spring pressures were open and closed.

Demon340 07-28-2023 04:06 PM
Re: Flat tappet lifter failure
 
Quote:
Originally Posted by Gmirza (Post 683587)
I lost one cam lobe, I noticed it after about 100 runs. I’m not sure when it went away. Most likely caused by lack of oiling at low rpm. From what I’ve been told the tool steel lifter, cast cam combination is only good for maybe 200 runs if you’re lucky. Go fast stuff can a P.I.T.A.
Lost a Tool Steel lifter after 6 runs..

Gmirza 07-28-2023 07:46 PM
Re: Flat tappet lifter failure
 
Quote:
Originally Posted by Paul Precht (Post 683591)
Hi George, do you know what your spring pressures were open and closed.
Hi Paul,
I’m not sure. I didn’t check them.

Bench Racer 07-29-2023 12:25 PM
Re: Flat tappet lifter failure
 
Terry you have a PM

Terry Cain 10-05-2023 08:11 AM
Re: Flat tappet lifter failure
 
https://rehermorrison.com/tech-talk-...-flat-tappets/

Billy Nees 10-05-2023 09:09 AM
Re: Flat tappet lifter failure
 
Quote:
Originally Posted by Terry Cain (Post 686967)
What's your point. If you want to use a roller cam then either run SS or build a newer Corvette Stocker!


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