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Banned
Join Date: Sep 2006
Location: South of Heaven
Posts: 21,159
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Opposing piston engine
http://engineeringtv.com/blogs/etv/archive/2008/07/01/opposed-piston-opposed-cylinder-engine.aspx
Very cool. New type of piston engine. |
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03-13-2009, 03:50 PM
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Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,695
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The CEO said 40% efficiency? Is that gonna work in the long run? The second chap said 3 HP per cu. foot? I hope he meant per cu in.
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03-13-2009, 04:02 PM
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gotta love the first question from the reporter after a rather technical description:
"sooo you have one cylinder for two pistons, right?" 
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Silver '88 RoW Carrera Grey '06 A4 Avant |
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03-13-2009, 04:19 PM
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In the shop at Pelican
Join Date: Aug 2002
Location: Los Angeles, CA
Posts: 10,459
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Junkers tried this with a 2 stroke diesel engine in the 40's
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03-13-2009, 05:03 PM
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canna change law physics
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My former company has 2 compressor designs which has horizontal opposed cylinders, to reduce the force couple. It used a 3 rod design, of which 2 were split. They were considering going to a 4 rod, double split design, so that more of the parts would be common.
The real savings is in the foundation for a compressor, since you don't have to deal with that force couple from the offset crank. It would also help in a car engine, with the reduction in weight of the block and in the less vibration transmitted to the frame. I'm not sure why they think the design would be 40% thermally efficient.
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James The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994) Red-beard for President, 2020 |
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03-13-2009, 05:05 PM
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Cogito Ergo Sum
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Looks like a cool idea if they can keep it funded and get it more maistream. Add some fins to that baby and make an aircooled Diesel!
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03-13-2009, 05:07 PM
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abit off center
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I still don't like engines whos parts have to stop and change directions.
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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03-13-2009, 05:16 PM
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Registered
Join Date: Mar 2004
Location: Higgs Field
Posts: 22,606
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I believe Fairbanks-Morse had an opposed piston, two cycle diesel locomotive engine back in the '50's.
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Jeff '72 911T 3.0 MFI '93 Ducati 900 Super Sport "God invented whiskey so the Irish wouldn't rule the world" |
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03-13-2009, 05:29 PM
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Navin Johnson
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 8,773
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Quote:
Like a two stroke or a four stoke engine where the pistons instantaneously change direction? The piston reaches apogee, then changes direction at some point the pistons motion did stop... even if for micro seconds.. Flywheels and multiple cylinders smooth things out..
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Don't feed the trolls. Don't quote the trolls  http://www.southshoreperformanceny.com '69 911 GT-5 '75 914 GT-3 and others Last edited by TimT; 03-13-2009 at 05:36 PM.. |
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03-13-2009, 05:34 PM
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Navin Johnson
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 8,773
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Quote:
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Don't feed the trolls. Don't quote the trolls http://www.southshoreperformanceny.com '69 911 GT-5 '75 914 GT-3 and others |
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03-13-2009, 05:36 PM
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AutoBahned
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"extremely lightweight"
yes! |
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03-13-2009, 06:07 PM
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abit off center
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This is the one I like::
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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03-13-2009, 06:28 PM
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The Puff.
Join Date: Sep 2007
Location: U.S. Navy
Posts: 1,290
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'70 CT1B '11 GTS 300 Super |
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03-13-2009, 07:36 PM
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Banned
Join Date: Sep 2006
Location: South of Heaven
Posts: 21,159
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Quote:
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03-13-2009, 07:47 PM
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Dog-faced pony soldier
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Internal combustion engine efficiency is WAY less than 40% today.
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A car, a 911, a motorbike and a few surfboards Black Cars Matter |
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03-13-2009, 08:12 PM
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Registered
Join Date: Apr 2008
Location: Houston TX
Posts: 8,704
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Quote:
The RX-7 fanbois call them "boingers". For pure simplicity, adaptability, and power per pound, you don't get more better than a rotary turbo. Want more power? Add a rotor. Or...go newfangled: http://auto.howstuffworks.com/quasiturbine.htm
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Mike Bradshaw 1980 911SC sunroof coupe, silver/black Putting the sick back into sycophant! |
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03-14-2009, 06:29 AM
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Unregistered
Join Date: Aug 2000
Location: a wretched hive of scum and villainy
Posts: 55,652
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I wonder how they are going to deal with the unburned fuel and cylinder lube in the exhaust, which is why the 2 stroke died in the first place?
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03-14-2009, 07:03 AM
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canna change law physics
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HP per pound, it is hard to beat a turbine. Making a turbine work well in a car is another matter.
But then again, on a thurst per lb of weight basis, it's hard to beat a ram jet!
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James The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994) Red-beard for President, 2020 |
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03-14-2009, 08:07 AM
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AutoBahned
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Quote:
I also wonder about those super long conn. rods on the outboard pistons... well, we'll see what happens with it |
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03-14-2009, 01:18 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,079
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Quote:
At least they tried
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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03-14-2009, 03:50 PM
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1988 Porsche Carrera 3.2
1970/1982 Porsche 914-6/911SC 2.7 RS
1986 Porsche 944 2.5l
1969 and 1986 Porsche Targa and Coupe 1720cc and 3
