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#61
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Opposed piston engines have two crankshafts and no cylinder head. Instead, two pistons share a cylinder and move towards and away from each other. As far as I know, this design has only been used on two-stroke diesels.
Voila! My mental invention has done already been patented, I guess. Long ago I conceived of an engine whose pistons "bumped heads" to create a combustion chamber fired by one plug. Thus, it had to have two crankshafts. I thought this would be "cool" for watercraft where the "twin screw" is provided by one engine with gearing to control the driveshaft output. Do you know when this design was developed, & what the application was. Ron (Gotta' patent the rubber band concept soon).
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Good s**t happened. 69 was worth the wait. '92 stock semi-pristine ebony - 160K '96 Grand Caravan - 240K '01 Miata SE - 79K '07 Chrysler Pacifica - 60k - future money pit. |
#62
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#63
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Pearl '92 LS-L 179K (Historic 1st 5-speed SVX) Mods: 5-speed, 4.11's, Group-N motor mounts, dual Magnaflows, cone air filter, Kenwood MP-228 CD/Receiver, white-faced gauges, '97 grill, custom window tinting. Ebony Mica '92 LS 80K Oct 2002 - Dec 2004: Victim of theft. She served me well. You can tell the lack of craftsmanship by the wrinkles in the duct tape. |
#64
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Junkers
Hi John, "Junkers" made planes at least during WWII. Since the engine you mention was a Diesel it might have been Junkers that tried to put a Diesel engine in an airplane. Boy, was it heavy. Take care, BOBB
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#65
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Junkers made numerous planes during WWII. They also used diesel engines in some applications, including seaplanes where diesel's are preferable to gasoline. The Junkers Ju-88 medium bomber was Germany's second most used bomber behind the Heinkle He-111.
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#66
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my grandfather (used to work as an engineer for fairchild) said the engine your talking about is a 'junker'. they were used in some water landing planes, apparently they had issues with timing and piston wear. he said he used to have one in his shop but he sold it to a friend who wanted to put it in his boat (not sure if he did the two screw shaft or not) that was almost 30 years ago. he used his to power a genorator and air copressor for his work shop (which is biger than his house). he did say they only have one output shaft so it would be diffocult to use it in the application you wanted, but they take up little space and produce insane amounts of hp.
Last edited by Matthewmongan; 06-04-2005 at 05:26 PM. |
#67
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Opposed pistons, design.
Yes Ron the Junker, was one of the German engine designs that were pilfered by the Allies after the War. It reappeared as the British Commer Knocker. A Three cylinder opposed piston two-stroke diesel. It used a single crank shaft, under the cylinders, with a set of rockers at the end of the cylinders to transfer the con rods movement to another set of rods connected to the crank underneath. Blowen by a Roots blower, it produced good torque, but burnt too many pistons.
I have no doubt that Subaru studed the early VW engine, and baised there design on it. So many German designs turned up in other Allied countrys. The BMW appeared as the Bristol engine that Cooper used in the Cooper Bristol. The DKW 125cc Two-stroke, appeared in the BSA Bantam, and also, mirror reversed as the 125 Harley Davidson. GMTA. I also though of building a opposed piston engine, using two 500cc Triumps bolted barrel to barrel, inlet ports at one end ,exhausts at the other, blowen. The cranks rebolted 180 degs apart and chained together. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#68
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But how many of you know that the first pre-production Spitfire used a BMW liquid cooled V-12? Production versions used the Rolls Royce engine.
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#69
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Well, I'll be dipped. Thanks, Johnny.
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Good s**t happened. 69 was worth the wait. '92 stock semi-pristine ebony - 160K '96 Grand Caravan - 240K '01 Miata SE - 79K '07 Chrysler Pacifica - 60k - future money pit. |
#70
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Some of your info is a little off
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#71
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The biggest difference between an EJ25D and an EJ25# obviously is not the location of the thrust bearing, but the head design. EJ25Ds are DOHC, and EJ25# are SOHC, with a head design nearly the same as the EJ22#, ie, SOHC, dual rocker shafts, roller rockers, mechanical adjustment. The case design was changed as well - the bellhousing now has eight bolts where there used to be four, the internal machining is slightly different to accomodate the aforementioned change in thrust location. Officially the EJ25# supplanted the EJ25D in 1999 for the Impreza 2.5RS and Forester, and 2000 in the Legacy, although, read below, that wasn't strictly true. Further changes included the location of the PCV valve changed in early 2001, while the crank and cam gears changed somewhat randomly to accomodate changes to the crank and cam sensor programs - some Legacies share their crank and cam gears with the CA emissions Impreza version of the EJ22#, and some don't. And somewhere around 2003, the rear of the LH head was drilled to accomodate a big hard pipe for the EGR system. The curiosity about the change from the EJ25D to the EJ25# is that sometime in the middle of that changeover Subaru found themselves with a lot of EJ25# blocks and a lot of DOHC heads. So an unknown number of blocks were machined to accept the EJ25D crank, pistons, and DOHC heads, and were subsequently installed in a handful of '98 Impreza 2.5RS and '99 Legacy Outback models without telling anyone. To this day, Subaru does not officially recognize or admit that these half and half engines exist, but a lot of people have seen them - we've seen at least three at my work. The changeover happened gradually and possibly randomly - we've told people the only way to know for sure is to count the bellhousing bolts. DOHC + 4 would be an EJ25D, DOHC + 8 would be the nondocumented mix-n-match engine, and SOHC + 8 would be an EJ25#. |
#72
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#73
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http://www.bmwworld.com/bmw/history/10s.htm Steve
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92 SVX AWD 130,000 w/ rebuilt SVX 4.11 97 Audi A4 1.8T (Daily Driver) 03 Ford Expedition(hers) SVXepidia SVX information warehouse Are you in? My Old Locker A 4.11 Founding Father "Tranny #6" I really need a manual Reading IX [SIGPIC][/SIGPIC] Ya I was there
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#74
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I wrote to SOA to see if they could help me in determining the origin of the Subaru boxer motors and more on the EG33. I hope they give me somthing good. For all of us.
Steve
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92 SVX AWD 130,000 w/ rebuilt SVX 4.11 97 Audi A4 1.8T (Daily Driver) 03 Ford Expedition(hers) SVXepidia SVX information warehouse Are you in? My Old Locker A 4.11 Founding Father "Tranny #6" I really need a manual Reading IX [SIGPIC][/SIGPIC] Ya I was there
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#75
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I did know the BMW symbol is a spinning propeller. But here's one for you. Why is it blue and white? I know.
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