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Recent content by Bribyk

  1. Bribyk

    Engine Dyno Practise

    You can use anything that will absorb rotational energy: a friction brake, air brake (fan), water brake, eddy current, alternator/generator, etc... or a combination of these. There's at least 8 common types of dynamometers but 4 of them are most common. They all have inherent advantages and...
  2. Bribyk

    Finding torque on a rotating disk.

    You could also put compression load cells under the engine and/or generator mounts to measure the torque transmitted between the two, since the reaction torque is absorbed by the frame or base. If your shims or chocks are thick enough you may be able to use the engine/gen jacking bolts to get...
  3. Bribyk

    Chassis Dyno. Am I missing figures in my calc? Torque looks high!

    You have another gear ratio to consider, the difference between the diameter of the roller and the diameter of the tire. Brian Bobyk - Hoerbiger Canada
  4. Bribyk

    Test Cell Exhaust system for large v engine

    Based on your handle, I'm assuming these are diesel engines. Do you really need a piped exhaust system? The easiest (and probably best) design is a "fume hood"-type exhaust where you have an open collector above where the exhaust outlets are and a large fan to extract the fumes from the test...
  5. Bribyk

    Compressor aftercooler cleanliness criteria

    There is an SAE standard related to cleanliness of engine intercoolers that may give you some direction. Brian Bobyk - Hoerbiger Canada
  6. Bribyk

    HP turbo LPG engine: Advice re Fuelling Ignition, & CR

    You can keep the same power (and get better efficiency) at those lean air fuel ratios, you add more air not cut back fuel. Brian Bobyk - Hoerbiger Canada
  7. Bribyk

    HP turbo LPG engine: Advice re Fuelling Ignition, & CR

    With industrial gaseous-fueled engines you typically lean out the mixture to avoid detonation. Check out the link for a pretty handy (if general) diagram. It is for natural gas so it will be similar, just your detonation zone will be lower on the chart (as propane is more prone to detonation...
  8. Bribyk

    HX coolant too fast to cool?

    Some industrial nat gas engines have a minimum recommended external restriction to prevent "coolant flow rates [from becoming] excessive." The consequences of "excessive" flow are not given though. Brian Bobyk - Hoerbiger Canada
  9. Bribyk

    Exhaust Header Design.

    One aftermarket header design for similar cast-iron head engines that I have seen used a two-piece flange split between ports 3 and 4, presumably for the reasons Mike stated. It also used slotted or half-moon mounting bolts to allow for expansion. Since you have dissimilar materials I would be...
  10. Bribyk

    Loads for Trailer Design

    Surely there's an SAE Standard for trailer design. I also recall a 1g lat/long load for securing cargo from somewhere...
  11. Bribyk

    Techniques for measuring pipeline surge/shock/hammer?

    ...Or a piezoelectric sensor and charge amplifier. Look up ballistics or engine cylinder pressure sensors.
  12. Bribyk

    tyre coefficient of friction vs speed

    Physics often has little to do with driving instruction. Hence the fact that you're supposed to reduce your following distance when behind both motorcycles and tractor-trailers. My instructor mentioned that this was because motorcycles stop quicker (true, no explanation given for the truck...
  13. Bribyk

    Information on GM Vortec 8.1 turbo engine

    This is the thread but I see you've probably already read it :) thread71-252760 Brian
  14. Bribyk

    Information on GM Vortec 8.1 turbo engine

    A turbo doesn't appreciably reduce peak (full load and speed) fuel consumption on these types of engines (rich burn, nat gas or propane). You do however get more power out of the same engine footprint/weight and better fuel consumption at lower loads. Also, keep in mind you probably won't...
  15. Bribyk

    Information on GM Vortec 8.1 turbo engine

    I believe the engine you are referring to is called the "8.1LT" and is commonly used for portable power generation. A search of "8.1LT generator" should turn up a few generator packager's datasheets. GM doesn't show a turbo as an option on their Industrial Engines but it's common to add an...
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