Re: 6 lobes off a camshaft?!?
[Re: Jonnyj00]
#898502
01/07/11 12:13 PM
01/07/11 12:13 PM
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Joined: Mar 2006
Posts: 9,910 Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
What would cause 6 lobes on the camshaft to get rounded off? (590 lift purple flat tappet) We used proper breakin procedure(25 min @ 3000)valve lash was never too tight. We were wondering if it could be defective camshaft? Any opinions would be appreciated!
2 things come to mind,something wasn't right and 25 minutes at 3000 rpm.Seriously,for six lobes to wear off,I would look at proper oiling and ajustments.What did you lube the cam and lifters with?Did you prime the oil system before starting?Are the spring pressures,and assemble heights and clearences correct?
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Re: 6 lobes off a camshaft?!?
[Re: Jonnyj00]
#898508
01/07/11 01:13 PM
01/07/11 01:13 PM
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Joined: Jan 2003
Posts: 3,031 Erda, UT
67Charger
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master
Joined: Jan 2003
Posts: 3,031
Erda, UT
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Did you remove the inner springs for break in? Anything over about 250 open is asking for trouble. A lesson I learned the hard way too.
11.33 @ 118.46 on motor 10.75 @ 125.35 w/ a little spray Now, high Speed Open Road Racing - Silver State Classic Challenge, Nevada Open Road Challenge, Big Bend Open Road Race Rocky Mountain Race Week 2020, 2022 2.0, Sick Week 2023
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Re: 6 lobes off a camshaft?!?
[Re: Jonnyj00]
#898509
01/07/11 01:14 PM
01/07/11 01:14 PM
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Joined: Aug 2006
Posts: 614 Michigan
Get-X
mopar
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mopar
Joined: Aug 2006
Posts: 614
Michigan
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How old was the cam? Was it sitting around on a shelf for a while? MP had soft core problems through out the '90's. Not sure if it ever got corrected as I've been gone from there since 2000.
'65 Belvedere '68 GTX '57 Dodge pickup
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Re: 6 lobes off a camshaft?!?
[Re: Jonnyj00]
#898512
01/07/11 01:59 PM
01/07/11 01:59 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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did this happen during breakin or after some miles were put on it?
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: 6 lobes off a camshaft?!?
[Re: sixpackgut]
#898514
01/07/11 02:14 PM
01/07/11 02:14 PM
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Joined: Oct 2007
Posts: 3,884 Oregon
hooziewhatsit
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master
Joined: Oct 2007
Posts: 3,884
Oregon
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When you put the lifters in, did they go in smoothly, or take a little work? If they don't spin when the engine is running, the cam will wipe in no time (when you took them out, how much force did it take?)
If you ever find yourself in a fair fight, your tactics suck.
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Re: 6 lobes off a camshaft?!?
[Re: emarine01]
#898519
01/07/11 05:47 PM
01/07/11 05:47 PM
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Joined: Aug 2003
Posts: 8,716 Baltimore/Denver
64Post
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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Roller lifters come apart too, albeit not at break-in. Solids take a bad rap from improper break-in/installation. This is just another case of improper break-in (likely too much spring pressure over the nose). I'd add EDM lifters (in addition to pulling the inner spring) to the rebuild next time (assuming it gets rebuilt).
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Re: 6 lobes off a camshaft?!?
[Re: Sixpak]
#898522
01/07/11 10:36 PM
01/07/11 10:36 PM
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Joined: Nov 2009
Posts: 2,177 ill
dennismopar73
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,177
ill
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i will agree i believe the cam was most likley bad i too had a 590 m p cam take off lobes as well mine was older version ,, i know know they had issues then sure they still do
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