Paging Oldbloke

you know, I've no idea, but I don't /think/ so.

 

then the more cylinders the better. A 1000cc four will make more power
than a 1000cc twin.

 

Yeah I think I am.

It's just that when I rode a friends bike (Magna 500 V4), when I rolled the
throttle on it picks up nice and smooth and when I rolled the throttle off
it didn't wedge my nuts in the tank, or make my eyeballs hit the inside of
my visor like the my Bandit 600 does.

D

 

I thought Simian kept those for his 7R

 

Would this be the ex-Simian bike we're talking about here? If so, I
think it has indeed got flatslides on it - certainly his 'new' one
has, and it's massively over-fueled and doesn't like to run below
about 4k, or 8k at high altitudes :-}

 

Perhaps because the Magna's an underpowered barge, whereas a B6 is a
not-so-underpowered not-so-much-of-a-barge?

 

darsy

Yes, but I thought we were talking about torque? Do fours make
proportional higher power to the ratio of rpm at max torque?

 

I think he took the flatslides off this bike and put them on his tuned
one.

 

No. They don't. Here's a very quick example from an old 'Bike' that's
lying around in my desk drawer:

BMW 1150GS:
max power 76.2 bhp @6500, max torque 69.1 lbft @5400
Triumph 955i Sprint ST
max power 104.7 bhp @9470, max torque 63.7 lbft @7380

So, the smaller, three cylinder engine makes very nearly as much
torque as the bigger triple, as well as much more power. And the
torque curve is actually much flatter too, with >57 lbft from 4k-10k
onwards, c/w about the saem between 3k and 7k on the beemer.



but for pure laziness and a total disregard for which gear it's in, a

 

Absolutely correct, that is exactly right, it does allow you to ride lazily.
Hopefully, once I've got to grips with it a bit more I'll ride it in a more
spirited fashion. The CB certainly is more responsive than the Zephyr, but
they are both fun, only in different ways. Yesterday's bimble home was a
bit of a learning curve for me (and prolly the Zephyr also).

This is true with the CB also, in fact it requires it in order for you to
make good progress. The Zephyr on the other hand is happy either way (I
think)

 

Whilst it's not a sportsbike, the CB changes it's character quite markedly
at around 6000rpm.

 

This is mostly MCN-concieved rubbish. For bikes of equal capacity, a
multi-cylinder bike almost always makes significantly more power than
a twin.

Twins's "feel" torquier because, having a lower rev ceiling, their
torque starts lower down the rev range. But ride a Hayabusa and tell
me it doesn't have any torque compared to any twin of your choice

The best description I've read of this stuff is here :
http://www.pumaracing.co.uk/power1.htm

 

Went a viewed a CB locally yesterday.... I give up, it was described as
"Mint", he forgot to mention that it was mint with huge amounts of
corrosion, worn out tyres, replaced speedo, broken rev counter, scratches to
most panels and when you open the choke the mirror moved with it!

D

 

darsy wrote

Of course what you really meant to say was Electric /motor/

Thank you.

 

Well, those sort of things are dependent on the quality of the
carburation, the flywheel effect (cranks with big flywheels give more
engine braking) and several other factors.

Engines with small cylinders (i.e. fours & sixes) tend to carburette
better, and therefore give a better response across the rev-range, so
that even if they may actually make less power at a certain revs, they
feel better. Of course, fuel injection has made this a bit easier now
- one of the main reasons Ducati were able to make such a big impact
with the 888 and then the 916 was that decent fuel injection allowed
them to run *much* larger venturi, and therefore much more fuel, and
still provide decent fuelling at low revs.

 

Sounds about right, now you mention it. I guess the question is
whether he bothered to properly adjust/balance the ones he put back on
yours...

 

Damn damn damn! I meant "more torque than a twin"

 

We seem to be bedevilled by typos here - you meant that "the smaller
three cylinder engine makes nrealy as much torque as the bigger
*twin*" I imagine.

 

I doubt it. Hey, it seems to go OK.

 

As does the turbo, but - duh - that's becuase (approximately) where
the turbo bit of it kicks in...