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  1. Gary_321

    Can an NSN number be used to cross-reference a fastener?

    If you are buying the part, it is irrelevant whether it is a primary or a secondary reference. It is more important to know whether the part number is fully defined, or if it is not, what additional information you need to give. If you order an NSN, you should be issued with the part that NSN...
  2. Gary_321

    Can an NSN number be used to cross-reference a fastener?

    Search results for MA13601-048-2 The first record (5310-01-333-2853) is the only one with MA13601-048-2 as a reference. The other records are close matches, not "hits". Opening 5310-01-333-2853 (link), we can see that... 1. The primary reference is MA13601-048-2. It is a 3-2 reference. The...
  3. Gary_321

    Can an NSN number be used to cross-reference a fastener?

    Search results for MA13601-048-3 The first record (5310-00-809-7437) is the only one with MA13601-048-3 as a reference. The other records are close matches, not "hits". Opening 5310-00-809-7437 (link), we can see that... 1. MA13601-048-3 is a 5-9 reference. The 9 is the most significant...
  4. Gary_321

    Can an NSN number be used to cross-reference a fastener?

    If by NSN, you mean NATO Stock Number (called National Stock Number in the US), I might be able to help. I used to codify NSNs. You have to know what the codes mean. The most common are... A 3-2 reference is the prime reference. It is the manufacturer's part number who actually makes the...
  5. Gary_321

    How does sphere diameter affect bulk density in a given volume?

    Here's the best that I can do in a couple of hours whilst watching telly... It is only the bottom layer, but I think the maximum density can only be achieved if the bottom layer is as full as possible. A is a single sphere in a cylinder B is the next smallest diameter cylinder C the next...
  6. Gary_321

    How does sphere diameter affect bulk density in a given volume?

    Can you tell us the internal diameter of the cylinder and the smallest sphere diameter that you consider practical? If the base layer is a full layer of spheres, the answer will be denser than if the base layer is not full. A full base layer will be a function of sphere diameter to cylinder...
  7. Gary_321

    E90 bmw mileage tampered with

    I'm not sure about the E90, but I have an E36 & E46 and... Most of the ECUs hold the mileage (in kilometres). It is held so any faults can be pin-pointed. The ECU that is used to display the cluster mileage is probably the only one that is tampered with by someone. I use INPA to access the...
  8. Gary_321

    Can somebody help me with this scavenging dilemma?

    PDF requested from ResearchGate. Thanks for the steer[cheers]
  9. Gary_321

    Is a Split Plenum a good idea?

    No problem with being advised that I shouldn't go down a certain path. I've seen enough posts on the internet to know that not being face-to-face can cause the wrong thing to be inferred. If I thing that I've got a problem, I'll ask for confirmation before assuming the worst [thumbsup]. How...
  10. Gary_321

    Is a Split Plenum a good idea?

    I wish that I had done the calculations earlier... I reckon that only 35cc would be "pushed" into the inlet tract. The volume of the inlet tract from trumpet-to-valve is 700cc.
  11. Gary_321

    An engine design they think is new

    Deltic locomotives took opposed piston engines to a whole new level... https://www.youtube.com/watch?v=D3bj47TAYiU Not very practical for automobiles, but an interesting engine to see in action.
  12. Gary_321

    Is a Split Plenum a good idea?

    I agree with this ATDC, but from approx 70° BTDC, the inlet valve is open and the piston is rising. From around 70° BTDC, the exhaust is closing, the inlet is opening and the piston is rising. I think there is the possibility that "air" at 23psi in the cylinder could choose the 15psi plenum...
  13. Gary_321

    Is a Split Plenum a good idea?

    I've done the analysis of the valve timings. The timings are different for each variation of the VANOS* angles. These timings are for a VANOS position during a 0-60mph test At least 2 inlet valves are open 100% (720°) of the time. At least 2 Inlets PLUS an overlapping exhaust valve are open...
  14. Gary_321

    Is a Split Plenum a good idea?

    I think that I need to do a short video to explain what I am thinking. It helps me to get my head around it, as well as being able to seek advice. At times like this I wish I didn't have variable valve timing! It would make the "problem" much easier to understand. At the moment, I'm charting...
  15. Gary_321

    Is a Split Plenum a good idea?

    jgKRI - I've expanded the graph to show all 720° and the net intake value is obviously wrong [hammer]. I need to have another think about this. I agree with your suggestion about no plenum, but I would need six new MAFs and an ECU to control the fuel.
  16. Gary_321

    Is a Split Plenum a good idea?

    I've only shown the intake overlap period as that is the period when the cylinders interact. The maths that I used was the in-cylinder pressures from http://performancetrends.com/Definitions/Images/Cylinder-Pressure-Lrg.gif]here[/url] and the minimum between the inlet valve curtain area or the...
  17. Gary_321

    Is a Split Plenum a good idea?

    It's a BMW S50B32. I have an M Roadster. It is the same engine that was fitted to the Euro spec E36 M3.
  18. Gary_321

    Is a Split Plenum a good idea?

    I've noticed something glaringly obvious. My six-cylinder engine is effectively two three-cylinder engines with a common crankshaft. Cylinders 1-3 have a common exhaust manifold as do cylinders 4-6. The intake has individual throttle bodies with all six cylinders have a common plenum. A...
  19. Gary_321

    Can somebody help me with this scavenging dilemma?

    I don't think that I would be able to source the equipment for a reasonable cost. I could have a go at making a rotary valve and use an electric drill and compressor. I don't think that I would be able to sense the reversion wave, let alone mesure it. I've been busy since I downloaded...
  20. Gary_321

    Can somebody help me with this scavenging dilemma?

    I've done some calculations and discovered that the pressure in the cylinder drops from around 125 psi to atmospheric in less than 50 milli-seconds at idle, and around 6 milli-seconds at max rpm. I was planning to pulse some air from a compressor to test the full exhaust system, but there is no...

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