<VV> VV Boxer definitions

[JVHRoberts@aol.com]

The ONLY boxer engines I know of that share crank pins for opposing cylinders 
are flat 12s. All Ferrari, Porsche and even the Subaru F1 engines were flat 
12s with 6 throw cranks. 
You can't get away with this on flat 2, 4 and 6 cylinder engines without some 
serious shakes. You probably can't get away with it on flat 8s either, but 
those seem to be rare engines, even in the aircraft world. 


In a message dated 3/7/2004 8:55:38 AM Eastern Standard Time, 
jncmiller@mchsi.com writes:
I found this definition on the net.

In 'flat engines' or 'boxer engines' or 'horizontally opposed engines' the
piston s lie horizontally opposed, giving them a very low center of gravity .
Some experts distinguish between V -at-180?nes and real boxer engines. The
real boxer has one crank pin per piston while in the V-at-180?ne two pistons
share the same crank pin. Real boxer engines can run perfectly smooth and free
of vibrations with a four-stroke cycle , regardless of number of cylinders.
The flat configuration fits very well with air cooling. Porsche and Subaru use
the design extensively in their engines today.

(sounds more like an Ad)

Although personally when I think of Boxers something else comes to mind (and
no, I dont think about it much). Just to keep this brief and not trying to air
any dirty laundry here....but Corvairs ...LM's anyway...are kinda sexy...so
wouldnt a "thong" be more appropriate? What about earlies?..........Depends?

                                                  John Miller

                                                  Iowa
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