Oil Pump Trick by Nick's Garage

Engine, Trans & Driveline

  1. themechanic

    themechanic Oklahoma is OK FBBO Gold Member

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    I recently saw a tip on Nick's Garage's video on new oil pumps. The entire video is worth watching but the clip starts at the oil pump tip. You learn something every day.


     
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    • Mopars & Missiles

      Mopars & Missiles Well-Known Member

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      Yes, that is an important check when building an engine. Been doing that for years now. Here's a couple before & after photos of an oil pump on an engine I rebuilt a little over 10 years ago.

      P3290050.JPG P3290054.JPG
       
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      • Mopars & Missiles

        Mopars & Missiles Well-Known Member

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        This partial obstruction is pretty common on these oil pumps, here's a before & after comparison on another engine I built about 5 years ago.

        PC040016.JPG PC040019.JPG
         
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        • 68 HEMI GTS

          68 HEMI GTS Well-Known Member

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          I always work mine also. Gotta check every detail.

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          • vintage chromoly

            vintage chromoly Well-Known Member

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            Yep, did the same thing to mine when we went through it.
             
          • BeepBeepRR

            BeepBeepRR Well-Known Member

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            Glad this video was up. I just took mine off and did this. I purchsed a cheap set of burrs off amazon. I have to say I was impressed with the little things. Did a nice job doing this modification. Also used a dremel to do the work. I think the set was like 14 dollars. If you are cheap like me they fit the bill. HERE

            IMG_1747[1].JPG IMG_1748[1].JPG
             
            Last edited: Mar 13, 2018
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            • BSB67

              BSB67 FBBO Gold Member FBBO Gold Member

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              Check the alignment between the two pump body halves. I have 4 Melling pumps here where the misalignment is so bad it probably blocks 25% of the cross sectional area on the pressure side. I elongate the bolt holes, twist and roll pin the two halves, then enlarge the smaller of the two holes to match the larger one.

              IMO, the aftermarket pumps are very poor. I now buy used OEM for $5 instead.
               
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              • BeepBeepRR

                BeepBeepRR Well-Known Member

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                I have the OE pump that was on the engine when i got it. I can install it on the engine just to see if it was any closer to the aftermarket pump as far as alignment. I will post pictures of that. I confirmed it is an actual mopar part number.

                OE was no better than aftermarket.

                OE Pump.
                IMG_1757[1].JPG
                IMG_1752[1].JPG


                Aftermarket Pump.

                IMG_1749[1].JPG IMG_1759[1].JPG
                 
                Last edited: Mar 13, 2018
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                • BSB67

                  BSB67 FBBO Gold Member FBBO Gold Member

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                  Split the halves and let us know what you find
                   
                • BeepBeepRR

                  BeepBeepRR Well-Known Member

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                  Umm the pictures are posted.

                  OEM

                  IMG_1757[2].JPG IMG_1752[1].JPG IMG_1755[1].JPG

                  Aftermarket.

                  IMG_1749[1].JPG
                   
                  Last edited: Mar 13, 2018
                • BSB67

                  BSB67 FBBO Gold Member FBBO Gold Member

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                  Right. The pressure side hole between the halves, not the suction side between the pump body and block. Maybe Melling has fixed it, but the alignment was so bad, about half the width of the o-ring was exposed to the cover half hole.

                  And if you are truly interested in improving the flow, or flow efficiency of the pump, you need to start with the block suction side, and at least remove the square inside corner. That is a far greater flow hindrance than that suction block to pump alignment. There are probably 5 places that can use some work in the pump including the pressure side pump to block, although that one is not too bad. But the block and pump passage are on different angles so I enlarge the blend an inside radius. I think even the threaded filter adapter in the Melling had a slightly smaller ID than the original, IIRC.

                  At the end of the day, thousands, if not millions of these pumps are in service without issue, so they are clearly over engineered enough to make up for it all. But if you are actually interested in making an improvement, correcting that one misalignment is not doing much of anything.
                   
                  Last edited: Mar 14, 2018
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                  • BeepBeepRR

                    BeepBeepRR Well-Known Member

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                    OK I guess I wasn't understanding what you were saying. I will have to check that out too.
                     
                  • 68 HEMI GTS

                    68 HEMI GTS Well-Known Member

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                    That’s a must on any build, the suction side has a lot of room for improvement.
                    Along with working the turn I enlarge the passage to the pump as well as open up the pickup to 1/2” not on anything that’ll see rpm.

                    On more serous builds people use external lines to avoid the restrictions inside the block. I use a single -12 on my hemi as well as a few wedge motors I’ve built.

                    6C422275-0B96-4657-98DC-B256141A3A72.jpeg 672BE01D-F7EB-425B-BA46-770E9AE87914.jpeg

                    External set up, not something most need.
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                    Last edited: Mar 14, 2018
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                    • rrTor-Red

                      rrTor-Red FBBO Gold Member FBBO Gold Member

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                      Nick's garage on Youtube is a good channel to subscribe to if you haven't done so.:thumbsup:
                       
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                      • HEMI-ITIS

                        HEMI-ITIS STREETER FBBO Gold Member

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                        I have mad respect for you OEM guys!

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