Hallo,
ich abe noch einen Hinweis im amerikanischen Fliegerforum
http://www.vansairforce.com gefunden. Denke die 130 Kg sind mit allen Nebenaggregaten, weil ich schon an anderer Stelle etwas von 180 lbs für den Rumpfmotor gelesen habe, was aber nicht zu verifizieren war.
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Im curious about the cooling system and other claims (not a lot of detail in the dwgs)- the btu's generated by an engine to produce x hp is going to be similar to other engines at the same power/fuel flow. The lower weight is interesting, but it is unclear just what is included. FWIW, My renesis shipping weight was just under 200 lbs dry with the big/heavy OEM intake manifold, wiring harness, and a welded steel pallet that have been discarded. The thing that I really like is the new modular design- just add another rotor assembly to increase power. Im guessing the advertised flat torque curve is a function of turbocharger's boost at low rpm and that power tapers off after 6000 rpm (possibly due to intake flow restrictions, similar to the older 13B's ???).
The 2-rotor turbocharged output seems to be very close to the NA Mazda renesis engine (also 2-rotor) at the same rpm: 180hp @ 6000 and 160hp @ 5000, peak torque 160 ft/lb at 5000. The biggest difference (I believe) is that the Mazda is capable of higher rpm and additional HP (up to 210 @ 7200 rpm); probably because of a slightly better fuel delivery/intake porting.
BTW, the "new/ slightly used for emissions testing" renesis motor cost $2000 complete, shipped to California from Australia. Id guess the normal renesis cost is closer to $5000 for used motors, but they are still hard to find. If one takes the effort to change an older/ much cheaper used 13B to peripheral intake ports, the power output is as good as the renesis or better. Depending on the actual weight difference, I'm not convinced that these motors are better than the Mazdas, given the huge difference in cost. Cooling is not a problem with well designed rads/ducting. BTW, you can get aluminum end housings from the Mazda racing after market, but they are expensive and not really needed, assuming that "equivalent to O-320/360" is our weight target in RV's.
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Gruß
Jens K
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