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Post by jamminjames on Oct 30, 2013 21:00:43 GMT -6
Need a little help guys. Sbc 350 hydraulic cam and comp lifters. Been breaking the retainers holding the lifters together. We changed from 1.5 to 1.6 rockers, 6 races later went to adjust valves and found 5 lifters broken. Changed lifters ran hot laps and rechecked 4 broken lifters, changed lifters and rockers (back to 1.5) during intermission ran main and checked them again. 1 broken lifter. We are stumped. Not the same lifters everytime HELP. THANKS
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Post by jamminjames on Oct 30, 2013 21:03:05 GMT -6
425 LIFT. Springs are good. No sticking of the lifters. Getting good oil thru pushrods compression check is good thanks
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Deleted
Deleted Member
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Post by Deleted on Oct 31, 2013 7:16:52 GMT -6
I think I would try a better brand of lifter, doesnt sound like the ones you run can handle the RPM's
Dave
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Post by jamminjames on Oct 31, 2013 17:58:59 GMT -6
they were comp 858's we have ran them for years with never a issue we do turn around 6700 we were thinking maybe a bad batch but they had 25 races before starting breaking when we changed them at the track we put in comp 812's (new) which do have a wire retainer on them
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Post by street16 on Oct 31, 2013 18:18:58 GMT -6
I tried running 1.6 rockers on a 350 with stock heads and found that the push rod holes in the heads had to be elongated. Not sure if this helps.
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Post by jamminjames on Oct 31, 2013 18:51:09 GMT -6
that is why we changed back to 1.5 we thought it might be rubbing except no wear marks on pushrods. and it still happened
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Post by lizardracing on Nov 3, 2013 21:43:09 GMT -6
Are you breaking the tie bars or the small clip holding the guts in the lifters?
You can upgrade to snap rings(local hardware store} for pennies and set lash to -.oo2 so the retainer isn't being beaten on if your currently running 0 lash.
If the tie bars are breaking then check cam end play. The lifter may not but centered on the lobe.
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Post by jamminjames on Nov 4, 2013 4:57:37 GMT -6
Breaking the clips that hold the guts in first 2 sets had the the good clips holding them in the 3rd set were just the wire clips. It could possibly be cam walk but it does have cam button with a nice 2 piece alum timing chain cover. We ran this motor 20 some races with no problems then Bam lifter issues . Wish I could come up with a cause before I tear it down hate to rebuild and still have a issue thanks
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Post by rebel1mcelroy on Feb 14, 2014 20:48:23 GMT -6
Had the same prob with the comp 84000 running 0 lash last year and I turn about 72. Im switching to isky 202hy they can handle the rpms they claim. Hope this helps
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Post by motorman on Feb 15, 2014 12:23:17 GMT -6
425 LIFT. Springs are good. No sticking of the lifters. Getting good oil thru pushrods compression check is good thanks stamped snap rings have 2 side to them since they are a stamping. one side the edge is rounded and on the other side is the edge is sharp and you want the sharp side up in a lifter to get a better bite. same for them in pistons as the sharp side should be towards the outside |
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Post by flipflopoo1oo on Feb 23, 2014 11:28:23 GMT -6
Hydraulic lifters have to be adjusted down away from the top! I like to run mine at .020 off the bottom! If your valve springs are not with-in your RPM range, they could be pumping up! Wrong adjustment most likely!
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