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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...

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...

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

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...

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

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

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...

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

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...

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

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

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...

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

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...

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...

Most manufacturers of medium to very large industrial natural gas engines also recommend a monograde (30 or 40) oil, except for cold starting applications. At least one manufacturer sites viscoity reduction due to shearing as the reason. Brian Bobyk - Hoerbiger Canada

Adding cores (and even thickness for that matter) has a diminishing return effect as each core added behind the first sees warmer air from the core ahead of it. Fit the biggest frontal area you can and then start adding cores as required. Talk to a manufacturer for their sizing recommendations...

With respect to bearing forces... You can take some load off the spindle/bearings with the caliper placement perhaps hoping to increase service life. However, I read somewhere that in racing applications this is not desirable as the driver can feel the bearing being unloaded and the resulting...

Before you go any further I would see how long it's going to take you to pay back a couple of thousand dollars for swapping gears (unless you can do this yourself properly) in fuel savings. Try this article for some suggestions but I doubt any of these mods are going to be economical though...

Your local gas code and NFPA 37 are good places to start looking for regulations and best practise. NFPA 37 states "combustible materials shall not be stored in enclosures housing engines" which pretty much means you need a dedicated room. Also, "engine rooms located in structures shall have...