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  1. R1100S

    The Bajulaz engine

    The surface area is huge, the compression ratio is low, and the amount of pumping working is increased. It is more complicated and expensive to produce.
  2. R1100S

    multiple processor

    I usually get the best performance from multiple processors by running multiple load or geometry cases simultaneously. Each instance of Nastran runs on one processor. The other advantage with multiple processors is that you can run one load case and still have processing power for drafting...
  3. R1100S

    4cyl. crank damper

    I've seen plenty of harmonic balancers on 4 bangers. I think the reasons for leaving them off is economics, and the fact that in econo-boxs no one minds a little extra vibration.
  4. R1100S

    Industrial gas engine exhaust backpressure minimum?

    Why do you want one exhaust system to work over such a wide range of displacements and powers? It seems that the system would be too big for the little engines and too little for the big engines? As for back pressure, the engine was designed to work with a certain level of back pressure. If...
  5. R1100S

    What stress Concentration Factor to use for Crankshaft Bending Calcs

    Finding the stress concentration factor for a crankshaft in bending is a complicated problem. Fortunately it is also a well studied one. Unfortunately most of the research was done in the 1930's and the books detailing it are long out of print. If you spend some time looking around you local...
  6. R1100S

    Gas Mileage Gears

    Are the 4:10 gears factory installed or aftermarket. It may be that GM reprograms the ECM for less peak torque, and less peak power, with the lower gears installed. However, if you take a car with 3.42 gears, pull them out, and install 4.10 gears, you will not effect rwhp. Rear wheel torque...
  7. R1100S

    Features of NX Nastran compared to NEi Nastran

    Previously Noran used Femap from UGS for there pre and post processor. Noran sold there own solver, NEiNastran, while UGS sold NX Nastran. Currently Noran is in charge of marketing, selling and supporting NX Nastran. See their newsletter from last April...
  8. R1100S

    A very simple plate Problem doesn't want to be resolved.

    What happens when you drop the rbe2 element and just apply the load to a node, point or edge? Also, I believe your rigid element must be rigid in the 2 direction if you want to it to transfer your force in the 2 direction.
  9. R1100S

    Dynamic Analysis

    If you are using the same mesh for both, it is relatively straightforward. If you're using Femap to set up the problem, go to model, loads, load from output.
  10. R1100S

    Mesh refinement with FEMAP V9.2

    Yes, the newer versions of NEi Nastran (I'm assuming that is what you are using) allow for mesh discontinuity between contact surfaces.
  11. R1100S

    Gas Mileage Gears

    I wouldn't answer your efficiency question. It depends on too many factors. Speed you drive, BSFC vs. speed and load of the engine, when you shift transmission gears, etc. However, the 10 less rwhp is almost certainly an effect of bad dyno operation (miscalculation by the operator) and not a...
  12. R1100S

    4000 bhp natural gas dyno

    What sort of test are you looking to have done?
  13. R1100S

    Buells anyone?

    tripleZ, Maintenance on the Buells is simple enough. It's a Harley engine is a simple chassis. Compared to a 600 they're much easier. Parts shouldn't be too hard to come by. They new ones are VERY reliable. Unfortunatly, they are not good motorcycles. Their fuel injection is off, the...
  14. R1100S

    Metric Keys - Are they commonly available?

    I've seen english keys on metric parts. I also see quite a few NPT pipe threads and UNC threads on metric parts, the english threads are for machine shop handling. However, any supply house (McMaster, Fastenal, MSC, etc.) carries metric keys. If you're going with a metric shaft diameter, I'd...
  15. R1100S

    Eccentric crankshaft engine design?

    Needs boost to run, otherwise no intake stroke. Contact stress is not your friend.
  16. R1100S

    Slipper Clutch, back torque limiters call them what u want

    I've heard of several MotoGP and other race teams trying what you are suggesting. The main problem they have is with the rider. It is easier for the rider to adapt to engine brakeing or a slipper clutch that to the inconsitant engine braking the servo controlled butterflies produce.
  17. R1100S

    2005 Concours and Honda linked brake system.

    If you want front brake, hit the front brake, if you want back brake, hit the back brake. Linked brakes seem like a complicated solution to a problem that can be solved by squeezing the right lever a little harder.
  18. R1100S

    the best type of steel

    An awful lot of those bikes have been modified and have new drive shafts on them, what are other people using?
  19. R1100S

    Dry Clutches for Motorcycles

    I shouldn't say special oil for wet clutches. Just different oil. In a dry clutch bike any automotive grade oil will do just fine. In a wet clutch bike the friction modifiers make the clutch slip more than it should so you need motorcycle specific oil without the additives.
  20. R1100S

    Dry Clutches for Motorcycles

    Ducati, BMW and Moto Guzzi all use them. They work well, but are easier to abuse than wet clutches. Wet clutches require special oil and have parasitic loses.

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