Re: [ST] What's Wrong?

["Marc Van Est" <MarcVE@xxxxxxxxxxxxxx>]

My Daytona feels no stronger below 8000rpm than my RS used to. It also
runs more "lumpy" at idle, isn't as smooth and uses more petrol.

Hit 8000rpm and it all changes, the motor comes on song and rips through
to 11 000rpm sweetly.

At 9/10 000 rpm it sounds brilliant and pulls like mad. 

Cheers


Marc 
-----Original Message-----
From: st-bounces@xxxxxxxxxxxxxxxxxxxx
[mailto:st-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf Of Matthew Heyer
Sent: Tuesday, August 22, 2006 2:46 PM
To: ST@xxxxxxxxxxxxxx
Subject: Re: [ST] What's Wrong?

1200cc harleys get something like 80 hp at the crank.
 
As the saying goes, it's not the size the matters, it's what you do with
it!! LOL!!  
 
Many things go into this in reality.  First, peak hp is really just a
multiple of the torque and rpm.  So with other things being equal, a
higher revving engine will have a higher peak hp.  That doesn't mean
that it has more hp at every other rpm - just that it gets higher.
Additionally, you can change timing, cam lobes, and other features of
the engine to make the hp come on differently.  For example, the R6
doesn't get good power until after 8500 rpm, and is an F'in banshee
after 11k.  While desireable for the track, this sucks donkey for the
road.  So change the engine configuration and get more useable power
downlow, and give up the high rpm hp (shift the torque curve).  This is
some of what goes on.  Look at the Daytona and Sprints that both had the
955 engine.  Same engine really but one had 147hp and the other 118 at
the crank.
 
And then there is getting past the engine inefficiencies, which is what
also happens with the big cruiser engines.  Many variable to change the
characteristics of the engines power output.  That's why different
strokes for different folks.
 
There's so much that goes into this, but it's not as simple as teh 675
puts out x hp, and the 955 should put out more.
 
 
Matt Heyer


----- Original Message ----
From: "Masiak, Richard" <Richard_Masiak@xxxxxxxxxxxxxxxx>
To: ST@xxxxxxxxxxxxxx
Sent: Tuesday, August 22, 2006 8:22:08 AM
Subject: [ST] What's Wrong?


Ok, what's wrong with this picture?  My 2000 RS (955cc) supposedly has
108 HP at the crank and the Daytona 675 cc triple supposedly has 125 HP
at the crank.  What's up with that?

How do I get more HP out of my larger triple?  It should be good for at
least 145 HP at the crank.
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