that's normal cruising rpm with a manual 4 speed in a wbxr vanagon.
I'm right at 3,800 rpm for normal 'about 64 mph' cruise.
when I'm going more like what is probably almost 75 mph ...I'm at 4,000 to
4,100 rpm.

my tires are only slightly larger diameter than stock. I run 205-65 R 15 C
Michelin Agilles ..
and 4K rpm ..
given the flat and weak torque curve of a wbxr engine ...
that's what they need at that speed, 4K rpm.

it's a short stroke, naturally balanced opposed four  engine ...not that bad
for it at all.
Scott
www.turbovans.com

----- Original Message -----
From: "Robert Fisher" <garciasghostvw@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, May 20, 2010 5:50 PM
Subject: Optimum WBX rpms; was RE: 4 speed/5 speed shifter

> --snip--
> perhaps that rpm would be a bit wound-out for a WBX boxer motor
> --snip--
>
> Mine seems happiest at ~3800-4200 rpms.
>
> Cya,
> Robert