The common Napier was an 18 piston design if I remember correctly, so this is just 1 bank of the triangular 18 cylinder one.
With the Napier, the issue was timing all the banks together, so maybe using a single bank is more efficient.

GregM

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Alistair Bell
Sent: Wednesday, March 07, 2018 2:19 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Is THIS the "boxer" transplant we've been waiting for?

Bah humbug

Just an updated and trimmed down version of Napier Deltic.

:-)

Alistair

> On Mar 7, 2018, at 8:48 AM, Jim. Felder <jim.felder@GMAIL.COM> wrote:
> 
> Everything is wrong with this new engine--opposed piston, combustion 
> ignition, two-cycle. But check out the video and tell me--if it became 
> popular—that you wouldn't want one in your Vanagon.
> 
> <
> https://www.cnet.com/roadshow/videos/radical-new-engine-makes-a-run-at
> -reality/?ftag=ACQ-00-10aaa5b&vndid=00e8ca988f7d01a748f9a28d57d69900d7
>> 
> 
> Jim