2 Weird Oil System Problems

Discussion in 'PSI Superchargers Tech Questions' started by Comax Racing, Mar 19, 2013.

  1. Comax Racing

    Comax Racing Member

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    I am in the process of priming my engine and I have 2 odd problems I can't explain at the moment. I primed the engine (drill) and get a solid 90psi, all the rockers oiled in about 20 min, I had a few lazy ones but to be expected. I should say all but 1, this one has been over an hour of drill priming with constant engine rotation, its mate on that rocker assemble went no problem. Can't figure that one out, any help would be great.

    Next odd problem,I have a Big m block and have my datalogger sensor in the large 1/2" port in the rear at the bellhousing (driver side) and my guage at the smaller 1/4" port below it. The guage comes up perfect and goes down when the drill is off, the datalogger read the pressure (90 psi) but when the drill is off it holds the pressure!! i varified this by removing it and you could hear a hiss then the display indicated 0 pressure. Re-installed the sensor,hit the drill 90psi, stopped the drill and it held the 90PSI. I turned the engine over 2 full revs to try to release any pressure, nothing. Pulled out the priming tool, pressure still there.

    Its like there is a check valve in there or something??

    Any help would be awesome, getting frustrated.

    Corey
     
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    Last edited: Mar 19, 2013
  2. SoDak

    SoDak Active Member

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    Problem #1:
    I had a lifter once that the oil hole did not get drilled, maybe you have on too.


    Problem #2:
    I would take those pipe thread reducers and fittings out of the Big M block and look with a flashlight and a blow gun to try to figure out what is going on.
     
    #2
  3. Comax Racing

    Comax Racing Member

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    I was hoping that I wouldn't have to pull the manifold but... A little update however, I put the drill on it again this morning before I had to go to work. It ran for about 20min, I pulled the rocker while the drill was on and I was getting "some" oil out the pushrod. It wasn't pouring out but it was there.
     
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  4. Dave Koehler

    Dave Koehler Member

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    Do you rotate the engine 90 degrees every now and then while priming?
    All those oil galleys need to line up to send oil on to the next point.
     
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  5. Comax Racing

    Comax Racing Member

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    Yup, rotatated the engine 1/4 turn every couple minuites for damn near an hr. I've had BB Chevy engines that have had a few rockers that are lazy but this is the longest I've ever seen.

    Corey
     
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  6. aj481x

    aj481x Member

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    Oil restrictors?
     
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  7. Comax Racing

    Comax Racing Member

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    Yes it has restrictors (.125" pretty big), funny all the rest of the rockers are pouring oil, (more than I would have expected with restrictors).

    Corey
     
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  8. aj481x

    aj481x Member

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    .125" is really no restrictors.
     
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  9. Comax Racing

    Comax Racing Member

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    Figured I'd Start big and go down from there.

    Corey
     
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  10. atelier HP Rich

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    Wich rocker/pushrod assembly is the laziest one??
     
    #10
  11. Comax Racing

    Comax Racing Member

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    Number 8 Intake. As of last night I have 2 1/2 hrs of priming on that rocker and virtually no oil. I'm going to pull the manifold and start swapping lifters to see if I have a bad one.

    Corey
     
    #11
  12. Comax Racing

    Comax Racing Member

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    We have a winner!!
    I had a bad lifter, swapped the suspect one to a different hole no oil! While old postion has oil with the different lifter.

    Thanks for the advice.
    Corey
     
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    Last edited: Mar 20, 2013
  13. SoDak

    SoDak Active Member

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    Awesome, I'm glad it helped you!

    On your other issue, we have 3 of the Big M blocks and also utilize the 2 oil ports in the back fo the block. One for a gage and one for an idiot light. The gages hold psi also but I thought it was the fact that the oil line was too long? You have me thinking now...

    As far as restrictor size, over the years we have always used .080" restrictors in our Mark IV, Gen VI and Big M blocks, until this winter... I drilled one of the Big M blocks restrictors to .113" which is twice the area of .080", to see what happens. I've only run it once since and noticed nothing different, but we'll see after a season of running.
     
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  14. Comax Racing

    Comax Racing Member

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    Suprised about the lifter, its a Morel, supposed to be real good, oh well, it happens.

    About the other problem,:eek: Ya, that was my fault.:eek: I had a 1/8" pipe nipple in the mix but didn't notice it was an old one from a blower boost memory kit, grabbed it by mistake. So basically the reason it seemed like there was a check valve holding the pressure was because there was. Thats been fixed.

    Thanks for all the help
    Corey
     
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  15. Ron C

    Ron C Jr. Dragster

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    I've never tested it, but to my understanding anything over .090 is like no restrictor.

    Blessings.........Ron C
     
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  16. Comax Racing

    Comax Racing Member

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    When I was troubleshooting my lifter issue, I pulled the bad one out of its bore with the drill turning the oil pump and it was like there was nothing restricting at all. So I believe that statement Ron. I've never run restrictors and that was a huge lesson. Solid column of oil flowing through the gallery. I'm just going to leave them as is for now. I'll just have to really watch things. Accumulator is going in before the car gets run, 15 ltrs of oil in the system.

    Corey
     
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