Visit The Dirt Forum for More Information

Author Topic:   cam problems
mark akins
Dirt Maniac

Total posts: 131
posted July 12, 2005 08:33 PM  
What would cause the back two rocker arms to have less travel than the rest? It looks to me like the cam may be ruined. Why would two on one side be the only ones bad? This is a new cam that had approximately ten laps of racing on it. What should I be looking for when I tear the engine apart?

Thanks
Mark Akins

sc1 racing
Dirt Freak

Total posts: 419
posted July 12, 2005 09:39 PM  
could be cam flattened, if using stock studs they could be pulling out, or bent push rods..

break in is the #1 reason for cam failures. is it solid or hydraulic? if hydraulic possible you have lifters not pumping up...

mark akins
Dirt Maniac

Total posts: 131
posted July 13, 2005 04:07 AM  
it is a solid cam and we looked at the push rods and they look good, but will have it apart later today.

Dirt-Tracker
Dirt Maniac

Total posts: 182
posted July 13, 2005 06:29 PM  
Either cam or lifters........probably both. Just went through this at beginning of season. Engine had nothing except break in time and six lifters had worn and one cam lobe was almost completely worn off. Been breakin engines in hte same way last 5 yrs......this one didnt make it. Comp replaced cam.

mark akins
Dirt Maniac

Total posts: 131
posted July 13, 2005 07:39 PM  
i just got it apart most lobes and lifters are shot , but only on the pass side of the car. the ones on the other side look good. this does not make sense to me .any ideas on cause?

sc1 racing
Dirt Freak

Total posts: 419
posted July 13, 2005 08:31 PM  
most likely just one side would be valve adjustment.. sure cam was patricized good or both sides would be worn..

also check rocker for clearances, push rod length, and spring heights and pressures..

nine finger
Dirt Forum Racer

Total posts: 76
posted July 17, 2005 05:11 AM  
are you restricting oil on one side of block. if so open it back up

POPACAP45
Dirt Newbie

Total posts: 3
posted July 31, 2005 10:22 PM  
Ok guys this is why I install all of my own cam bearing and clean my block the right way. I have been building race engines since I was inHigh school and have had only one wear of cam lobes. it was a block and bearing problem. take time when doing your engine. don't just throw one together and wonder why it breaks every week. my last engine I built has ran 3 years in a row and still dominates when its on the track. oh and all you guys who think you need $$$'s in the engine well this little 383 runs a $239 scat crank, $259 6 in scat rods, and wiesco pro tru pistons. just take your time, trust me it will pay off. oh a bad oil restrictor can cause this as well. I hope this has helped

Back to the Archives