Let’s Tune This Engine

Discussion in 'Cams, Heads and Valve Trains' started by DorianL, Feb 22, 2021.

  1. Loves302Chevy

    Loves302Chevy "One test is worth a thousand expert opinions."

    Well, now you are alert.
    You can take a screwdriver sharpened to a point, attach a wire to it connected to ground, and push the point through the plug wire boots at the distributor, grounding out 1 cylinder at a time.
     
  2. DorianL

    DorianL solid fixture here in the forum Staff Member

    Took it out for a drive. Smooth performance. Missing some top end. I’ll have to look into the timing at higher rpm.
     
  3. DorianL

    DorianL solid fixture here in the forum Staff Member

    Like poking a hole in the boot to ground it out ?
     
  4. Loves302Chevy

    Loves302Chevy "One test is worth a thousand expert opinions."

    Yes, but just a pinhole. You do not want to destroy the integrity of the boot.
     
    DorianL likes this.
  5. DorianL

    DorianL solid fixture here in the forum Staff Member

    Took car for a drive today. At start up the valve train is a bit noisy. It sounds like one rocker is loose. Drive a couple of miles and it goes mostly away.

    Hm. I do really wonder if these Comp Cams lifters are, as the brits put it: shite.

    I don’t want to replace them unless, a.) I’m sure they’re the problem; and b.) new lifters will solve the problem.

    I’m not even sure that this is a problem.
     
  6. rlphvac

    rlphvac reliable source of info

    Maybe 1 lifter is taking a little longer to pump up or leaks down a little more as for what 302 said you can go to an auto parts store and buy a cheap pick set they all have sharp pointed ends and are small Harbor Freight sells them for 1 dollar over here look on their site to get an idea but I see them in most Auto Parts stores
     
  7. Loves302Chevy

    Loves302Chevy "One test is worth a thousand expert opinions."

    I see your problem - or at least the indication to your problem.
    Look at your video again. I don't know what side of your engine this is.
    One rocker is not getting oil like the other seven are, and you can hear the tick as you pass the camera over that rocker.
    Dorian NO OIL.PNG

    And in the SLO Mo rocker video, from what I can see, your pushrods look like they are too long.
    It could just be the camera angle, though.

    Unfortunately, you are not going to like the solution. I have been through this before.
    And it seems that I am the only one in the world that has figured this out - right here on Grumpy's. ;):D:rolleyes:
     
    Last edited: Apr 4, 2021
  8. Loves302Chevy

    Loves302Chevy "One test is worth a thousand expert opinions."

    This could be your problem Dorian: http://garage.grumpysperformance.co...ulic-lifters-mystery-solved.12263/#post-60159
    And yes, I know your lifters are hydraulic roller. The insides are still the same.
    Because you have a roller camshaft, your lobes M-I-G-H-T be fine.

    In my case, there was no oil to the rockers below 1700 rpm. Once you revved the engine above that, oil began to flow. But less than the proper amount.
    The cheap offshore crap lifters I used were made wrong. No spoiler here, you will have to read about it. Mike.
     
    Last edited: Apr 4, 2021
  9. DorianL

    DorianL solid fixture here in the forum Staff Member

    Hmmm. Thanks Mike. I think it is becoming clear that there is a lifter problem. It ticks more at start up and then fades after about 2 miles of driving.

    It’s quite a pleasant drive once it’s running.

    More testing will be required. It seems like the lifter bleeds down within a few hours. At least that is the interval I checked.

    Rats ! Replacing all the lifters will be expensive. I take it I should go with Howard’s lifters ?
     
  10. busterrm

    busterrm solid fixture here in the forum

    ya know Dorian, I might pull that push rod and run a pipe cleaner through it, might have a clogged up pushrod!
     
    DorianL likes this.
  11. DorianL

    DorianL solid fixture here in the forum Staff Member

    Good idea as well.
     
  12. busterrm

    busterrm solid fixture here in the forum

    Morley makes good lifters, I use Howards lifters myself!
     
    Unforgiven and DorianL like this.
  13. Loves302Chevy

    Loves302Chevy "One test is worth a thousand expert opinions."

    Well, when I had my lifter problem, Brian recommended ISKY.
    I took his advice and the ISKY parts do indeed function the way they are supposed to.
     
  14. Thunderbolt

    Thunderbolt Active Member

    This is a bit OT, but since we are talking lifters, good hydraulic flat tappet sbc lifters, do they must have a hardened surface? How to recognize a good lifter?
     
  15. Loves302Chevy

    Loves302Chevy "One test is worth a thousand expert opinions."

    Grumpy can field this question.
    My 2 cents...….
    Offshore crap has infiltrated everything.
    I guess you will have to buy from a reputable brand name company and hope they stand behind the product.
    That's really hard to do with engine parts, because by the time you figure out something is wrong, the entire engine might be trashed.
    And they will only refund the cost of their part, not your entire (now ruined) engine.
     
  16. Grumpy

    Grumpy The Grumpy Grease Monkey mechanical engineer. Staff Member

Share This Page