02-04-2005, 03:24 PM
hey, wouldya look at that! 8)
http://www.deltahawkengines.com/index.htm
....these guys are making them for airplanes! Their tests so far are for a non-intercooled one, making ~240ftlbs/50HP @ 1200 RPM and ~330ftlbs/165HP @ 2700RPM. They predict 200HP with an intercooler. So at least it looks like they don't HAVE to be room sized. Doesn't look like it has much of an RPM range, but it looks like they're making progress....
I just talked to Dean, an engineer there, sounds like exciting stuff. (to me) The 2700 RPM's it turns is mostly a limit of injection technology, he siad there's not much reason it couldn't be designed to turn faster if the injectors could keep up. Make sense since current 4-stroke diesels usually top out at 4-5k, and in a two stroke they have to fire twice as often, so I'd say they're doing pretty good. He did say the for automotive applications, there's more of an emissions hurdle, and their engine currently is too dirty for that. Aviation standards are more relaxed. Neato.
a few highlights from their site:
upright 90 degree V-4, turbocharged, direct drive, two-stroke diesel with oil pump and external air-oil separator/sump
160 and 200 hp models, at 2,700 rpm
currently about 327 lbs including starter, oil pump, fuel pump, water pump, turbocharger, all internal lines and internal exhaust system
lower part count and fewer potential leakage points than the current 4-cylinder gasoline-powered aircraft engines:
no cam shaft or valve train
no head gaskets to blow and no head bolts
fully doweled, four bolt main construction (12 studs)
inherently stout block and compact V-4 design
no ignition system
http://www.deltahawkengines.com/index.htm
....these guys are making them for airplanes! Their tests so far are for a non-intercooled one, making ~240ftlbs/50HP @ 1200 RPM and ~330ftlbs/165HP @ 2700RPM. They predict 200HP with an intercooler. So at least it looks like they don't HAVE to be room sized. Doesn't look like it has much of an RPM range, but it looks like they're making progress....
I just talked to Dean, an engineer there, sounds like exciting stuff. (to me) The 2700 RPM's it turns is mostly a limit of injection technology, he siad there's not much reason it couldn't be designed to turn faster if the injectors could keep up. Make sense since current 4-stroke diesels usually top out at 4-5k, and in a two stroke they have to fire twice as often, so I'd say they're doing pretty good. He did say the for automotive applications, there's more of an emissions hurdle, and their engine currently is too dirty for that. Aviation standards are more relaxed. Neato.
a few highlights from their site:
upright 90 degree V-4, turbocharged, direct drive, two-stroke diesel with oil pump and external air-oil separator/sump
160 and 200 hp models, at 2,700 rpm
currently about 327 lbs including starter, oil pump, fuel pump, water pump, turbocharger, all internal lines and internal exhaust system
lower part count and fewer potential leakage points than the current 4-cylinder gasoline-powered aircraft engines:
no cam shaft or valve train
no head gaskets to blow and no head bolts
fully doweled, four bolt main construction (12 studs)
inherently stout block and compact V-4 design
no ignition system