Race Preparation of 1999 R6 Engines

Why ? I think it's a perfectly apt description of the denizens of

I prefer to be able to talk to someone without risking my head being thocked.

To me it means "Self Addressed Envelope", im the kinda idiot that this stuff needs explaining to.

It didnt sound too bad, though i was pondering if he'd google searched a bit.

*snipped logical argument*


Mike.S

 

Chris, check out http://mototuneusa.com/ This guy has some interesting
ideas about tuning R6s. He claims reducing intake port size can
increase power by increasing the speed with which the intake charge
enters the cylinder, allowing better intake at the end of the intake
stroke. He seems to have done this to a few R6s with encouraging
results. This would probably work pretty well if you're already
restricted to a single 20mm opening.
Good luck
Mark

 

an excellent observation

 

Thank you John, we need more people like you in this world

 

Yeah we've been taking about compression lately. (possible) problem is
we run a 98 control fuel we can't go too crazy.
Second thoughts i think chromoly would be a better choice than Ti for
the rods of designed right.

Thanks for the input!
when it gets back online we'll have some juicy pics etc at
www.fsae.unsw.edu.au

 

"RM" said:

Yes.
This is a discussion board. Read 'online pub'.
I would much rather sit down in the rege with a round of beer and a
crowd of moto gurus and talk about these things. Unfortunately these
questions came up among my car team friends and nobody had the
answers, so I thought i'd ask another group of (MOSTLY) good blokes
what their thoughts were.

Sorry about the absence of beer but mr RM this whole online thing is a
little constricting to ones communication options.

RM: why are you posting on this thread?

 

One of the recent bike mags had an article about one of the 1000cc 4
cylinder bikes running in WSB with the restrictors (to keep Ducati
competitive ;-) - they were running something like 14.5:1 on a
remarkably low octane fuel - the article at least implied that the high
compression ratio still "worked" somehow due to the influence of the
restrictors...

I _think_ it was AMCN talking about the GSXR1000, but I can't quite
remember...

big

 

(reaches over, pulls AMCN's Aus GP issue)

15.8:1, actually.

Quoth Bruno Bailly, Alstare's chief engineer,
"We tried going still higher-in Japan, to 16.4:1-but... we've backed it off
for security reasons."

 

Yeah, drag racers might be worth talking to as well - they know "black
magic" about improving midrange and torque by using long skinny inlet
manifolds and trumpets - if you're artificially limited to a 20mm inlet,
thats going to mean making midrange torque is more important that
concentrating of top end power...

I suspect though, that the engineering guy knows all this - he's asking
for advice anout what breaks first on an R6 motor... I dont know the
answer to that - I've known 2 people who've had the detent spring shit
itself, and one who had a bearing shit itself (which got fixed under
warranty), but they were all road/trackday riders, not serious racers...

big

 

Yeah yeah, mines in the pile in the spare room, waiting to be posted
over to Paul in the "land of the boring motorcycle mag"...

Farrk... Does it mention the octane rating? I for some reason thing the
Superbikes are restrcted to 100 octane, but I can't google up anything
quickly to support that...

big

 

Thank you. You're clearly a man of taste and sophistication. ;-)


BTH

 

Careful or you'll get stains on your dress.

Nev..
'03 ZX12R
'02 CBR1100XX

 

Yes, quite possibly, it's not a particulary pejorative term.

OK, so we've settled that then. Anyone likely to have the answers to
his question is likely to know, anyone who doesn't know can get off
his lazy arse and google it up and learn something.

What position ? The third stool from the left at the Uni bar in the
squarehouse ?

Naah you're the one who had a dummy spit about the way he said it. I
merely pointed out that many already have a context.

Well actually from my perspective I though the tone of the whole note
was quite harsh in fact sneering, but then I've been guilty of poorly
worded notes so I'm hardly the poster boy for group hugs and caring
and sharing.

No, he reacted to your note - I probably would have said something
similar.

You reap what you sow - you treat people with contempt and they'll be
negative, treat them well and they'll be positive. So yeah, absolutely
if you'd been helpful it would have been "friend buddy pal" but given
you pissed in his pocket it's a bit hard to be nice...

My opinion, like everything on usenet it's worth what you paid for it
<shrug>

JL

 

Awww gee shucks <blush>

JL
(flattery will get you everywhere <grin>)

 

The use of restriction in the intake increases the intake speed at
lower revs and hence improves power down low at the expense of the top
end (strangled up top). If you're already restricted on the intake
side, I'd chase down the rearranging the powerband path - it's not max
HP that matters so much - what you should consider chasing is pushing
your max torque lower down the rev range - you've dramaticaly
increased the weight you're pushing so the torque becomes far more
important. Think about cams and exhaust to balance the intake changes.
IK's suggestion re heavier crank isn't a bad one - get more inertia
into the system can help drive in a windy course (your revs wont
bounce up and down as much) only really useful if you're finding
yourself bogging down out of corners though.

I'll be surprised if your max torque point in the rpm range hasn't
already been forced well below that of a stock r6 - have a look at
pushing it down further and then utilising the extra torque - you
won't need to lower the gearing then - you'll be able to pull a higher
gear without bogging down

JL

 

Chris wrote;
~

Because this is a newsgroup and he had some additional information that
somebody could use.
Just 'cause you posted first doesn't mean you OWN the thread.
YOU are the one who spat the dummy first with your petulent little
"attitude" comment so don't try and lecture others on manners.
~

Not me.
Clem

 

Oh Nev - what happened to you? You used to be such a kind and considerate lover.


BTH

 

I have, but you've all been so rude I'll keep it to myself.

 

....snip
think_ it was AMCN talking about the GSXR1000, but I can't quite

<boggle> You'd have to be running nitromethane or alcohol for that, surely ?

Security ? The security of the riders anatomy perhaps ?

JL

 

?

Or just some of that Elf 103-octane stuff that costs something of the order
of $10/L.

I remember reading about Kawasaki running a compression ratio of just over
15:1 (can we call that "low 15's"?) in their superbikes as far back as
1998...

Actually, if Daron's reading...

....what cr did your RR use to run back when it still had the 750 motor in
it?

That should provide some perspective. That thing was state of the art a
decade ago...