Date:         Sun, 4 Feb 2001 08:10:45 -0800
Reply-To:     Ari Ollikainen <Ari@TIMPANINET.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Ari Ollikainen <Ari@TIMPANINET.COM>
Subject:      Re: New 2001 EV details
Comments: To: Andrew Grebneff <andrew.grebneff@STONEBOW.OTAGO.AC.NZ>
In-Reply-To:  <v01550100b6a294b4dba6@[210.54.197.181]>
Content-Type: text/plain; charset="us-ascii" ; format="flowed"

> >        So, for 2001, the 2.8L VR6 has gone from 12 to 24 valves,
>
>Due to its oddball SOHC design, the VR6 cannot be fitted with 4
>valves per cylinder unless it uses rockers to actuate them, as each
>camshaft operates both inlet & exhaust valves of one bank of
>cylinders.  There won't be enough room, I believe (never actually
>having seen a VR6 engine or even a decent photo), to fit true DOHC,
>which would require 4 camshafts in one head!

        Typical for German innovation...the 24v VR6 uses a single head
        with TWO camshafts. One camshaft operates the intake side valves
        and the other operates the exhaust valves. So it's really a DOHC
        design.

>I guess it must use rockers as it is now anyway, or are the valves
>aligned along the engine axis as in most fours?

        This I don't know.

        I'm still trying to understand the motivation for putting the
        24v VR6 in the EV...






        Timpani Networks          Ari Ollikainen
        P.O. BOX 20088            Chief Technical Officer
        Stanford, CA              Ari@TimpaniNet.com
        94309-0088                650.852.0200, (cell)415.517.3519