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Thread: Indian four oil pump adjustment.

  1. #41

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    Ha, funny that you say that, I did wonder if that could be the cause, and I messaged JG to see if he would post such a small part over to me. I remember you suggested that I put a new spring in, but it measured up the same as a new replacement one, so I carried out the test with the existing one, but I was hoping to get one shipped over before I assemble it.
    I will test it again as soon as I put the new spring in, and post the results on here.
    Thanks again Larry.

  2. #42
    Join Date
    Jan 2013
    Posts
    127

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    Just like a valve spring, they weaken and embrittle with heat and time. Remember, this is a pressure system, not a high volume racing system, at low rpm you want oil to the mains and not spilling. Pressure will fall into lower teens even less if you idle down and lug the bottom end.

    This is why knowing the accuracy of your running oil gauge is important....set and regulate your pump using a good "instrument". Then check the difference between the instrument (modern gauge) and your old US Gauge.
    Last edited by L Burke; 12-04-2018 at 08:09 AM.

  3. #43

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    That is really a question for the original manufacturer, if there is no information available I would recommend a pressure in the region of 25 - 30 ibs/ft and certainly not exceeding 40 ibs/ft unless there is solid information to the contrary.

    This is the reply that I just got back from the engineers that made and babbited the bearings.

  4. #44
    Join Date
    Jan 2013
    Posts
    127

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    They know their babbit!

  5. #45

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    Hi Larry,
    With this information, and if you were in my position, what pressure would you set the spill at ?
    Thanks again for all this help,
    Ivor.

  6. #46
    Join Date
    Jan 2013
    Posts
    127

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    I do not know how the bottom end was sat up on your engine. If I had beaded the crank.......in my bike, I would set my spill no greater than 40 lbs at a nice fast idle.......checking the speed on my drill with a machinist tachometer, a little over 1/2 spees is about 850rpm. I am quite sure there are motor builders out there who might or might not agree with me. This is the heart of your engine, call someone who does this for a living and buy a little of their time. It will be worth you peace of mind considering the value of your bike.

  7. #47

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    Hi Larry, I don't understand why the speed that the pump is turned should affect the spill rate. I can see that the pump produces more pressure when it is turned fast compared to slow, but irrelevant of how much pressure the pump produces, I thought the spill valve was just a pressure relief valve that is adjusted to open at the maximum pressure you want the oil to arrive at the bearings. I really want to be comfortable about these details while I complete this build, because I think if the previous builder had paid more attention to these details, I wouldn't be going through all this now.

  8. #48
    Join Date
    Jan 2013
    Posts
    127

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    Hi Ivor, you are probably correct with your concern of the previous builder and the setup of the bottom end. Just remember, at lower rpm range the majority of the oil is passed throughout the system, at higher rpm oil is spilled back into the sump pan, all this is determined by the lubrication needs of the bottom end.

    Some bearing materials and bearing types you will want as much oil as possible flowing over the bearing surfaces. Modern insert type bearing ran at higher speeds, demand more oil, which will be delivered at a higher pressure setting on the spill. Spill rates are set as high as 50-55lbs using modern insert bearings. With this style of pump, you can not have your cake and eat it too! It is pressure driven and not a volume pump, a volume pump in which you actually flood the bottom end with oil at any rpm.

    With the 4 pump if you run a high flow of oil delivered at a higher pressure, some babbit compounds can actually be worn away or mined out with high pressure delivered oil. The rate of wear is determined by the composition of the babbit. Hope this helps.

  9. #49

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    Thanks again Larry.
    I have just put the new spring in from JG's and the pressure is clocking 95lbs and that's just turning it slow with cold sae50 and the spill adjuster wound out as far as I dare.
    The pump looks exactly the same as Roy's. I just don't know where to go from here ?

  10. #50
    Join Date
    Jan 2013
    Posts
    127

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    I can not tell from here, but you might try this.....take the spring to a auto machine shop, use their valve spring tester....might have to build a gig to hold this smal spring and check the compression poundage of the spring.
    Your approach correct, I am unsure how you are doing the set up process. You might consider sending the pump to Roy Davies and let him set it up. This step is important. Roy can be reached by private message on the Indian4 Club face book page or pm me and I will send his contact info

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