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  #16 (permalink)  
Old 09-05-2002, 04:23 AM
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Not a dumb question, yes new lifters. I do only run the restrictors on solid lifter cams. Both motors were solids. Good ol rules dictate no mushroom lifters either. I tend to agree with the oil restriction theory. Both engines were heavy into oil control devices. Windage trays, scrapers, plugged but vented lifter valley, lifter valley pan, vacuum pump scavenging (etc.) For a while I'm going to keep out the restrictors and concentrate on ensuring a good oil film.

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  #17 (permalink)  
Old 09-05-2002, 04:16 PM
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Have you considered a high pressure additive like STP?
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Old 09-06-2002, 05:46 AM
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I've used them in the past. My concern this time was how quickly the cams went away. It just really left me (and my customers) scratching our heads. This forums input has helped me greatly with a sanity check and some good thoughts on possible causes/fixes.
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Old 09-06-2002, 06:36 AM
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Send Jon a few close up pics of the lifter and cam lobes so we can see the failure mode, without seeing the type of metal fatigue it really is impossible to guess.

Have a look at this.
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Old 09-14-2002, 07:08 PM
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This is just a tip for you guys using lighter springs for break in. I noticed that speedway offers 1.3 ratio rockers made exclusively for cam break in. It looked like a handy deal to me.
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Old 09-15-2002, 02:40 PM
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Were these new blocks.Is there a lifter bore alignment problem?Other then that,I would look at you engine assembly methods.Restricting oil to the lifter passeages wont really hurt the bottoms of the lifters unless you were running drilled lifters or grooved lifter bores and needed the extra oil.The number on source of lobe lube is rod bearing side clearance and if you have been using different rods that fit tighter then your previous setups it will hurt oiling to the cam.Another problem could be if you are running heads you arent familiar with.Tight retainer to guide clearance could leave you with a retainer that is bashing the valve seal but isnt hitting hard enuff to bend the pushrods,and that will dramatically increase the surface load on the camshaft.Another problem is chevy oiling,but tis pretains to all chevy engines,and wouldnt have surfaced out of the blue.I would check those items before blaming the cam and lifters.
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Old 09-15-2002, 08:03 PM
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http://www.cranecams.com/instruction...in/camfail.htm

[ September 16, 2002: Message edited by: Quepas00 ]</p>
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Old 09-15-2002, 08:12 PM
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Is there an echo in here?
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Old 09-16-2002, 03:39 AM
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I just received word back from the cam manufacturer. After reviewing the cam and lifters he said the problem lies with the lifters. According to him they have had MANY failures with lifters since the current lifter shortage began. Personally I'm a little relieved. I was hoping that after 20 years of building numerous engine assemblies my brain hadn't finally seized up.
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Old 09-16-2002, 06:07 AM
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That is a good point and I hadn't thought of it. With the current shortage of lifters, all manufacturers (including OEM) are scrambling to find new sources. Most are using sources that they haven't used before, including a lot of "stuff" coming from offshore.
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Old 09-16-2002, 04:09 PM
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a few things i didn't know about 1 synthetic oil on a new break in. since your dumping the engine oil after break in isn't that a big waste of money? and wouldn't it increase ring break in time if you put more back in? also, i never heard of -pardon my ignorance- lifters that go in from the bottom and can't figure out how they could go up and down if the bottoms were fatter than the tops; plus, lifter shortage? what lifter shortage. ps. a note on chinese steel, their govt. inspectors consistently pass inferior steel off as higher grade steel that just as consistently fails our inspections, ala Alaska Airlines that fell out of the sky a few years back. things haven't changed. the nations largest scaffolding supplier will not use anything made in china for that reason. <img src="confused.gif" border="0">
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Old 09-17-2002, 04:57 AM
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all cost aside, synthetic oil is a no no for break in. The rings either take forever to seat or won't seat at all. Plus it's so slick the lifters have a tough time rotating during break-in. I agree about Chinese steel. Too many companies are using it. Unfortunately the bean counters aren't generally Hot Rodders.
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Old 09-17-2002, 06:36 AM
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What's next? Another toilet paper shortage like in the 60s? Life stinks.
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