Re: [ST] 2005 ST power

["colt4530@xxxxxxxxxxx" <colt4530@xxxxxxxxxxx>]

My dealer rep says the engine is wider and the frame is new to accomodate
it.  That implies a larger bore.  The Daytona shares the same architecture
and at 170 HP will need more revs than it can stand now.  Stroking the
2002+ mill doesn't make that much sense in light of that.  I'm also sure
the 128 HP for the ST is crank HP.  

John

Original Message:
- -----------------
From: Garry Simmons garrysimmons@xxxxxxxxxxxx
Date: Thu, 9 Sep 2004 12:42:25 -0400
To: ST@xxxxxxxxxxxxxx
Subject: Re: [ST] 2005 ST power



> 2) The power figures we've seen are close to being accurate. Hopefully
that 
> was a rwhp # someone posted but I am sure it was @ the crank. Anybody
know?

It's at the crank. 2005 factory specs are posted on the Team Triumph web
site. They increased the stroke by 10% and it appears (my speculation only)
left everything else the same. That's only a 5% increase in the "lever arm"
the piston works against, hence you get a 5% increase in torque.

My guess it that there's nothing new in the top end aside from a new crank.
Appears to be the easiest way to get a modest performance bump at little
cost (uses existing pistons, valvetrain, conrods, etc). I could be totally
wrong here, but suspect they cheaped out on a full motor redesign. Boring
it out 3.8mm instead of lengthening the stroke would yield the same
displacment, but would make for a 10% increase in power (10% larger piston
top area), assuming they got the same "boom" (more fuel required for larger
combustion volume due to larger bore). Boring it out would require lots
more new parts though. I think they probably shot their wad in 2002 when
the bumped up the compression, bigger airbox, and whatnot. The only place
to go from here is bigger.

- - Garry


- --------------------------------------------------------------------
mail2web - Check your email from the web at
http://mail2web.com/ .



     *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *
      The ST/RS Mailing list is sponsored by Jack Lilley Ltd.
          http://www.TriumphNet.com/st/lilley for more info
   http://www.TriumphNet.com/st for ST, RS and Mailing List info

=-=-=-= Next Message =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=