Wiped Out Lobe Symptoms....
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Depends on how wiped out the lobe is. I have seen some cams with lobes that are pretty bad and it seems to run fine. Of course it was a mild cam to start with. Your power level will drop off and yes it will start to miss at a higher rpm. If you suspect anything pull the valve covers and measure the lift.
Pro
Joined: Jun 2002
Posts: 538
Likes: 7
From: Johnsonville Wi
In my case (solid lifter 365 hp), a worn exhaust lobe resulted in pressure in the crankcase and some excess oil backing up into the aircleaner. This caused eventual fouling of plugs - but still ran strong.
Daffy2
Daffy2
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,713
Likes: 31
From: Shreveport LA
LA Events Coordinator
What if you have hydraulic lifters? What would be the symptoms?
Pro
Joined: Mar 2008
Posts: 716
Likes: 1
From: Albuquerque New Mexico
I experienced a wiped lobe with Hyd. lifters (comp cam 268XE). First symptom was excess play in the valvetrain on this particular lifter which showed itself in the form of a ticking sound. Same sound as if you had a slightly loose rocker that needed adjusting. I verified was a wiped lobe by removing valve cover, remove spark plugs, turn engine slowly with wrench on crank and watch the valve train while looking for rockers that don't move as high as others.
