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  1. overmod

    Rationale for coolant system temps

    I know of some experiments with GM 6.5TD diesel engines where lower thermostat setpoints were used to counteract higher EGTs. There are marine versions of this engine that have 160-degree thermostats, and several people installed these thermostats in trucks. I was told this was a bad idea...
  2. overmod

    Why did the Caminez engine fail?

    Doesn't look to me like there's side-loading on the pistons at all -- the interior of the skirts rides on the outer races of the large roller followers... I can see several problems: First is the very large mass of the pistons in this design, due to the heavy bearings that communicate the...
  3. overmod

    electric constant flow injection thoughts?

    Not sure I understand exactly what you're thinking here -- seems like several different kinds of fuel system being mixed up... If I understand correctly, you want something that: 1. Provides appropriately metered fuel and air to the intake ports on a V-8 engine; 2. Has the *appearance* of a...
  4. overmod

    Gasoline vs. Diesel Turbo longevity

    Much as I hate to say it, we may never know the actual 'longevity' of most turbocharged air engines *in that service.* There are mandated rebuilds (e.g. TBOs) at specified engine-time intervals which are well short of the effective hours-of-operation equivalents for the mileages being...
  5. overmod

    ducted fan use for air intakes on carbed engines

    Yah. But for a very specific purpose: short-term boost to allow better NA engine speed change under load. As a supercharger, this idea suffers from the same problem as electrically-driven superchargers in general -- very high currents are required for the desired hp. of boost. The efficiency...
  6. overmod

    Axial Flux PMDC design motor noisy

    This may be simplistic, but what happens when you VARY the load and adjust motor for constant speed? If you don't have access to a brake dyno of appropriate size and characteristics, you might want to gin something up that can be continuously adjusted in small, measurable increments. Then...
  7. overmod

    I am in the process of investigatin

    At first guess, a 2MW genset using a single engine would be up in the range of EMD power. Belt drive to fans with these engines can be tricky. Most locomotives I've seen use electric fan drive (the fans are remote from the engine, and operate in a different plane). One locomotive (a Baldwin...
  8. overmod

    cam timing mod question

    Take a look at the BMW Valvetronic actuation mechanism. You might, in fact, be able to adapt some of these parts to your specific application. A shifting-cam approach, although involving much more initial complexity in cam design and grinding, does allow the exhaust-cam optimization to follow...
  9. overmod

    LPG expert needed

    Could be either. Just another reason for careful reading and research! If you have a critical mixture going into the cylinders -- e.g., just lean enough for stoichiometry -- and the spark lights it, you get detonation. (That counts as ping!) (Any leaner, and the engine won't run...) If you...
  10. overmod

    Gas Engines Running on Lighter HC

    I agree with Pat about in-depth searches -- but, in brief: Thermodynamically, the power from a given mass of fuel is related to its phase (e.g., gas vs liquid) and to the energy release from oxidizing reactions (breaking of chemical bonds in the fuel, and making of bonds between fuel elements...
  11. overmod

    Liquid propane injection

    I'm also with Pat and Retracnic. The whole point of the system that "carburetes" the LPG on your vehicle is to mix the (cold) LPG with air correctly, and raise its temperature for clean vaporization. A fairly 'cheap' way to get intake-charge cooling on acceleration might be to...
  12. overmod

    Diesel Truck fuel flowmeter ?

    Seems to me that the 'cheap MPG gauges' are vacuum gauges. You may recall that we're talking about diesels. Compression-ignition engines do not have manifold vacuum correlated with fuel consumption... in fact, shouldn't have manifold vacuum at all ;-} Also remember that the compression for...

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