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Teeroy 
Samba Member
Joined: April 20, 2003
Posts: 3685
Location: Eastern WA
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 Posted: Fri Feb 23, 2024 9:41 pm Post subject: Lifter Pitting |
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So I pulled my 1776 apart to reseal, repaint tins and change heads. It's about 15-20 years old unknown miles, been in 5 different cars now. Anyway all looks great except pitted exhaust lifters, cam and intake lifters look new? Berg/Engle cam EP 12 blank, Berg lifters (all circa 2000). Any theory why exhaust would pit and not Intake? Engine has been spun over 7000 rpm many times, Berg dual springs, good oil.
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67rustavenger
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Joined: February 24, 2015
Posts: 9767
Location: Oregon
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| Posted: Sat Feb 24, 2024 10:16 am Post subject: Re: Lifter Pitting |
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I've had a similar experience recently, with a minor exception.
Tore down my 1679 and found the lifters were pitted. The difference in my experience is, the camshaft exhaust lobes were worn and the intake lobes look unaffected.
Web cam 119 and old school reground lifters of unknown origin.
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modok
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Joined: October 30, 2009
Posts: 26787
Location: Colorado Springs
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| Posted: Sat Feb 24, 2024 11:32 am Post subject: Re: Lifter Pitting |
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| I've thought the exhaust lobe by the flywheel might wear out first, because it's farthest from the thrust bearing and gets the least oil, but i can't think of why the other exhaust lobe would wear faster. |
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Teeroy
Samba Member
Joined: April 20, 2003
Posts: 3685
Location: Eastern WA
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| Posted: Sat Feb 24, 2024 3:14 pm Post subject: Re: Lifter Pitting |
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4 is worst followed by 3,1 then 2, but just exhaust, intakes and all cam lobes perfect.
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Dan Ruddock
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Joined: October 25, 2012
Posts: 3594
Location: Sarasota, in my adopted state of Florida
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| Posted: Sat Feb 24, 2024 5:07 pm Post subject: Re: Lifter Pitting |
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| Check the spring installed height, maybe the exhaust springs are too tight. |
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Teeroy
Samba Member
Joined: April 20, 2003
Posts: 3685
Location: Eastern WA
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| Posted: Sat Feb 24, 2024 6:15 pm Post subject: Re: Lifter Pitting |
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I'll take a peek at that, interesting thought. Putting different heads on it anyway.
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vw_chuck
Samba Member
Joined: May 05, 2004
Posts: 6
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| Posted: Mon Mar 11, 2024 9:17 am Post subject: Re: Lifter Pitting |
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| Yes your exhaust has more force on the lifter face when it opens against cylinder pressure. |
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Teeroy
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Joined: April 20, 2003
Posts: 3685
Location: Eastern WA
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| Posted: Mon Mar 11, 2024 1:19 pm Post subject: Re: Lifter Pitting |
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How about too tight of have lash? Was only running.004 on exhaust.
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Teeroy
Samba Member
Joined: April 20, 2003
Posts: 3685
Location: Eastern WA
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| Posted: Mon Mar 11, 2024 1:22 pm Post subject: Re: Lifter Pitting |
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New heads only have HD single springs, will the orange box C B lifters hold up? Or should I run the CB Light weights? Nicely broken in EP 12 cam
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