What size Oil Restrictor

Engine, Trans & Driveline

  1. 2quick

    2quick Well-Known Member

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    Here is a video of the new Comp Spotsman Lifters 96829B-16 installed and primed. Looks like the oil flow is about half what the Crower lifters were letting out. Hope it's enough of an improvement.


    Here's a couple pictures I took to compare the 2 Lifters.

    IMG_5462.JPG IMG_5463.JPG IMG_5464.JPG IMG_5466.JPG IMG_5467.JPG IMG_5468.JPG
     
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    • PRHeads

      PRHeads Well-Known Member

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      Well, it’s an improvement for sure....... but still more than I’d “prefer” to see.

      The used 87019’s I have here have a .028” feed hole to the axles....... and I bet there can be a pretty good flow of oil going through that size hole.

      I think the new lifters would show an improvement in the oil presssure.

      Did you put smaller restrictors in the heads?

      After watching the video a few times........ at the beginning you see the oil start to flow from between the wheel and the strut, then it starts flowing from what looks like between the lifter body and the bore....... like there is excessive clearance.

      Have you tried a “wiggle test” with both the lifter and bore clean and dry?

      If it’s still apart, and you had a friend with a pair of 829’s you could borrow....... I’d try them in that same pair of bores and see what you got.....”just to see”.
       
      Last edited: Apr 16, 2019
    • 2quick

      2quick Well-Known Member

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      Yea, I was hoping the body diameter of the Comp lifters would have been a bit larger then the Crower but the Comps are actually .00045 smaller, Which is a minute amount I know, but still. They felt good in there. Could it have been a .001 tighter probably, but nothing I'm going to fix at this point.

      As far as the restrictor goes..... I installed a .062 restrictor and it's still lots of oil pouring down the sides, you can see it in the video. I'm thinking to go to .050 and see what happens.

      I also opened up the pushrod passages, clearanced the rockers, and resized the pushrods, so going back together tonight. Hopefully I have good oil pressure and no noise and I'll be a happy camper. Trying to get out to Ocean City maryland foe the Cruisn show on May 17. Don't need anymore head aches.
       
      Last edited: Apr 16, 2019
    • PRHeads

      PRHeads Well-Known Member

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      “Resized” the pushrods?

      Judging by the oil running down the block, I’d say a .050 restrictor wouldn’t be a problem.
       
    • 2quick

      2quick Well-Known Member

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      Pushrods were to long after switching from the crower lifters to the comps. Pushrod seat is higher on the Comp lifters.

      Better then to short though......only 82 bucks to resize at Smith Brothers.
       
    • PRHeads

      PRHeads Well-Known Member

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      Got it, thanks.

      I checked with one of my customers who runs those 96829B-16 lifters in an unbushed 440 block.
      His motor uses the stock “through the cam” oiling to the heads.

      Hot oil pressure is 25psi@700rpm, jumps to 60psi@1000rpm, then from 1500-2000rpm and up its 70-75psi.
       
    • Challenger340

      Challenger340 Well-Known Member

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      FAR better than before !
      I would agree you still have a little more Oil coming out/around the Lifter in the Bore itself than we normally see(Lifter Bore Clearance), but it shouldn't be an issue to adequate oil Pressure at either idle or rpm using a 20-50 Oil.
      Ditto the .050" Restrictors like Dwayne said, should be fine.
       
    • 2quick

      2quick Well-Known Member

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      Here's a better video of the Comp lifters.
      I'm sure someone will find it useful in the future.
       
    • PRHeads

      PRHeads Well-Known Member

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      That still seems like a river of oil coming down from the heads.

      I suppose if the feed hole to the axles on those lifters are as big as the 87019’s I checked(.028”)......... they could flow that much oil just through those holes.
      Look how much oil is coming down from the heads....... and that’s only one .062” hole per side.
       
    • 2quick

      2quick Well-Known Member

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      Actually that's with .052 hole in the heads. I took the .062 out. I'm going down to .046.......
       
    • Hemirunner

      Hemirunner Well-Known Member

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      Interesting thread. I’ve always run .040 restrictors in the indy feeds with no issues. As to the lifters, there’s not a lot of choices besides the 829 on an unbushed block. I understand the failure difference between a bushing lifter and a needle bearing lifter, but I don’t understand the recent fear of using the needle bearing lifters. If the valvetrain is setup correctly, there shouldn’t be any abject failure of the bearing over the bushing assuming we’re not talking extreme applications. I ran a set of 829s in a street/strip build for nearly a decade with no issues.
       
    • PRHeads

      PRHeads Well-Known Member

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      You just want to make sure the feed hole to the top is big enough to allow for oil to be pushed uphill and reach the front of the rocker shafts, at hot idle, while there is a bunch of leakage from around every rocker.
       
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