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Why are BMW air cooled engines called boxers?

42 Posts | Latest reply on 02/10/2010 00:56:48 by yamahama | Go to original / last post

42 posts found over 3 pages. Page:

julie j

In: Harrogate
Posts: 1581

Yeah like that really helps!

Message posted by julie j on 01 October 2010 at 18:03

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julie j @ 01/10/2010 18:03:40

GreasyTony

In: Camberley
Posts: 1325

The correct name is horizontally opposed, Thats right Yam, but not all horizontally opposed engines are Boxer engines.

Message posted by GreasyTony on 01 October 2010 at 18:14

GreasyTony @ 01/10/2010 18:14:28

yamahama

In: leicestershire
Posts: 1606

Are only twins boxers then?

What would you call a twin crank opposed piston engine?

This is getting very techy now.

Julie I feel scorned, and you've brocken my emoticons.

Message posted by yamahama on 01 October 2010 at 18:22

yamahama @ 01/10/2010 18:22:58

GreasyTony

In: Camberley
Posts: 1325

No mate, any flat engine that has opposed cylinders that reach TDC at the same time, be it a twin, a four, a six etc. Subaru Impreza for example is a boxer engine.

Message posted by GreasyTony on 01 October 2010 at 18:32

GreasyTony @ 01/10/2010 18:32:11

yamahama

In: leicestershire
Posts: 1606

What about Deltic Engines?

Message posted by yamahama on 01 October 2010 at 18:34

yamahama @ 01/10/2010 18:34:14

Wills

In: New Brighton
Posts: 3265

Twin crank opposed pistons is a 1930s Junkers design. Now a three-crank design is a what? Used to see and hear quite a lot of 'em when I was a nipper.

Message posted by Wills on 01 October 2010 at 18:36

Wills @ 01/10/2010 18:36:01

GreasyTony

In: Camberley
Posts: 1325

Deltic, Thats not horizontally opposed mate .. it has three sides

Message posted by GreasyTony on 01 October 2010 at 18:37

GreasyTony @ 01/10/2010 18:37:03

Wills

In: New Brighton
Posts: 3265

Curse you Greasy Tony, you answered my question before I even posted it!

Message posted by Wills on 01 October 2010 at 18:37

Wills @ 01/10/2010 18:37:07

julie j

In: Harrogate
Posts: 1581

so one of the very few thing i know about my superdream engine is that it is unusual in that both pistons fire at once, is there a special name for this,is it a good or bad thing?

Message posted by julie j on 01 October 2010 at 18:37

julie j @ 01/10/2010 18:37:59

GreasyTony

In: Camberley
Posts: 1325

Thats different again Julie. It called 'wasted spark' ignition. Both cylinders fire at the same time but only one cylinder is on the combustion stroke. Isit a good or bad thing .. neither really, its done for simplicity & cheapness in production. Although any performance engine will have a 'single fire' sequential ignition system.

Message posted by GreasyTony on 01 October 2010 at 18:40

GreasyTony @ 01/10/2010 18:40:44

yamahama

In: leicestershire
Posts: 1606

Napier built them for locos Delta as the cylinders form a triangle.

What about opposed pistons in a single cylinder with bell arms and a single crankshaft?

Did anyone build an horizontally opposed engine with common crank pins. I always tried to imagine what my old BMW boxer would have run like with a single crank pin. I bet it would be uncontrolable but a right laugh!

Message posted by yamahama on 01 October 2010 at 18:44

yamahama @ 01/10/2010 18:44:10

GreasyTony

In: Camberley
Posts: 1325

Yes, Alfa Romeo Alfa Sud.

Message posted by GreasyTony on 01 October 2010 at 18:46

GreasyTony @ 01/10/2010 18:46:14

yamahama

In: leicestershire
Posts: 1606

Has someone erased my last post?

Thinking about it, a flat parallel twin with 180 deg crank would best describe a boxer wouldn't it?

Message posted by yamahama on 01 October 2010 at 19:02

yamahama @ 01/10/2010 19:02:18

WheelyNealy

In: Near Driffield
Posts: 2751

so an RG500 is a boxer of sorts then as it has twin cranks i know its not opposed but hay square four boxer punching independantly ?

Message posted by WheelyNealy on 01 October 2010 at 19:03

WheelyNealy @ 01/10/2010 19:03:10

yamahama

In: leicestershire
Posts: 1606

This is very interesting but way off topic. I bet BJ hasn't read a word of this. lol

Message posted by yamahama on 01 October 2010 at 19:08

yamahama @ 01/10/2010 19:08:16

WheelyNealy

In: Near Driffield
Posts: 2751

A flat engine is an internal combustion engine with multiple pistons that all move in the horizontal plane. The most popular and significant layout has cylinders arranged in two banks on either side of a single crankshaft, generally known as "boxers". ...

Message posted by WheelyNealy on 01 October 2010 at 19:09

WheelyNealy @ 01/10/2010 19:09:23

yamahama

In: leicestershire
Posts: 1606

Nealy have you copied that out of a dictionary?

Message posted by yamahama on 01 October 2010 at 19:12

yamahama @ 01/10/2010 19:12:15

WheelyNealy

In: Near Driffield
Posts: 2751

no google mate brilliant int it lol

Message posted by WheelyNealy on 01 October 2010 at 19:15

WheelyNealy @ 01/10/2010 19:15:56

RustyKnight

In: Newton Aycliffe
Posts: 2462

Rob

Well spotted mate but as wheely says, that's why googles so good LOL

Message posted by RustyKnight on 01 October 2010 at 19:20

RustyKnight @ 01/10/2010 19:20:33

yamahama

In: leicestershire
Posts: 1606

Another point for you BJ, the water cooled ones are called boxers aswell.
I hope you've read all this BJ there will be questions later.

Message posted by yamahama on 01 October 2010 at 19:35

yamahama @ 01/10/2010 19:35:25

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