Not to bring up an old subject, the 13B rotary "KEG"" weighs right under 180# (dry). This number is fairly consistant across many references. Where it varies is when you get numbers for a "complete" engine. That 180# number includes the rotors, the housings, the irons, the eccentric shaft, oil pump, oil pan, and the front plate. - no accessories, no flywheel, no intake manifold or injectors, no exhaust manifold, no alternator, no oil injector pump, no water pump, no starter..... Just the basic equivalent of a long block engine. Any real world comparisons should be done similarly IMO.
I prefer the long block equivalent since many weights out there in the interweb are either just plain BS or do not mention the conditions of weight. Add to that, one person using a lightweight flywheel and the other including the factory flywheel/clutch assy really throws the comparison numbers for a loop. It is just too difficult to come up with real comparisons on weights.
The closest realisitic comparison I can come in short work was the 2.2L Ecotec coming in at 235# for a long block with water pump and front engine mounts.
http://www.locostusa.com/forums/viewtopic.php?f=4&t=10979&start=15 Of course, all of those missing ancilliaries add up and may close the gap fairly quickly if you are comparing stock vs stock running engines.
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Chuck.
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