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04-21-2018, 08:14 PM | #1 |
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Flat tappet lifters
Hi all
Looking for advice on solid flat tappet lifters for a maximum effort sbc 311" with factory cast iron heads restricted to a maximum tappet diameter of 0.904" and mushroom tappets are not allowed as per class rules (Australian Superstock). Whilst we have used Schubek/Smith lifters in the past with one failure (what a mess) were looking at going a different way. Given the rpm (8500-9500) and the aggressiveness of a newer style camshaft we are running (Cup style cam) we are looking to get some recommendations on lifters. I have read in some older forums that racers have had good results with DLC tool steel lifters. So i would just like to get some feedback and past experience with these and if they require any special break in or oil to be run with them. The cam shaft is a steel core 55mm cam with all the latest surface treatments for increasing surface hardness. Any input would be highly appreciated. |
04-21-2018, 09:29 PM | #2 | |
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Re: Flat tappet lifters
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Your choices are NASCAR Nextel Tool Steel lifters with the DLC coating made by Trend, PPPC and Ferrea. The PPPC tool steel lifter can be sent back to PPPC for resurfacing later on. For your application, make sure to get a lifter for an AMC application since they have the proper pushrod oiling for a Chevy engine. Both Trend and PPPC make the oiling modification. Ferrea already has a modified lifter under P/N LF1004. http://trendperform.com/b-94213-1149...rformance.html https://www.pppcenter.com/06Catpgs/C5.pdf |
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04-22-2018, 05:46 AM | #3 | |
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Re: Flat tappet lifters
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04-22-2018, 06:21 AM | #4 |
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Re: Flat tappet lifters
Yes, you can run DLC coated tool steel lifters on an 8620 steel core camshaft. I strongly suggest the high end finish that Comp Cams has recently introduced. I use and sell only Trend lifters. I suggest you ask your lifter supplier about motor oil, as certain DLC coatings do not always work with just any motor oil.
We use the Trend tool steel lifters (without DLC) with as much as 550# open pressure on 0.842" lifters. We do this on nitrided cast iron core cams, and we do not use the EDM oil hole.
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Alan Roehrich 212A G/S |
04-22-2018, 07:28 AM | #5 | |
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Re: Flat tappet lifters
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04-22-2018, 08:45 AM | #6 | |
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Re: Flat tappet lifters
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We're not using DLC coated lifters, we may try them in the future. The guy to talk to at Comp is Dave McCarver. The new finish is one actually developed for the LSx series roller cams. However, the idea behind it is to provide the smoothest possible surface, so that more of the roller contacts more of the lobe. The gain for a flat tappet application is that the breaking is pretty much a process of burnishing and polishing. So the more polished a surface is to start with, the easier it is to finish the break in. Realize that DLC is just like the foot on a Schubeck in that it absolutely does not tolerate impact or abrasives. That's the reason DLC does not work on cast iron, cast iron is a really nasty abrasive.
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Alan Roehrich 212A G/S |
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