Underseat Exhaust ... they have gone too far

"Brent Mooney" <great.white.DeleteThis@north.com> wrote in message
news:4552077a.197528@news.sasktel.net...
> I've never really gotten underseat exhausts. I mean, what's the point
> other than to roast your rear? Surely it's not being done for engine
> performance or for ground clearance, because if it was all the MotoGP
> bikes would have them.
>
>
> --
> Brent Mooney

I like the undertail exhaust......not sure why. I tell ya though Suzuki
needs to put the butt ugly muffler on the GSXR1000 under the seat where no
one can see it.

Steve
 >> Stay informed about: Underseat Exhaust ... they have gone too far 

>
> I've never really gotten underseat exhausts. I mean, what's the point
> other than to roast your rear? Surely it's not being done for engine
> performance or for ground clearance, because if it was all the MotoGP
> bikes would have them.
>
>

It seems like it would add more weight rather than save it. That seems
like a lot more plumbing to get the pipes tucked up under the seat.
Side exhuast seems simpler and lighter. I can see it making sense if
you had saddlebags like the VFR...

Why not flip intake and exhaust on the engine? that would make the
pipes nice and short. Plus the intake would stay cooler for more power.

cya
Sean
 >> Stay informed about: Underseat Exhaust ... they have gone too far 

"rendell" <felloffmybike RemoveThis @and.crashed.com> wrote in message
news:zvGdnWLceaVDdc7YnZ2dnUVZ_uGdnZ2d@storm.ca...
>>
>> I've never really gotten underseat exhausts. I mean, what's the point
>> other than to roast your rear? Surely it's not being done for engine
>> performance or for ground clearance, because if it was all the MotoGP
>> bikes would have them.
>>
>>
>
> It seems like it would add more weight rather than save it. That seems
> like a lot more plumbing to get the pipes tucked up under the seat.
> Side exhuast seems simpler and lighter. I can see it making sense if
> you had saddlebags like the VFR...
>
> Why not flip intake and exhaust on the engine? that would make the
> pipes nice and short. Plus the intake would stay cooler for more
> power.
>
> cya
> Sean

You couldn't flip the engine over. Gravity plays a big part in the
engine oiling. You are right about it not being the best way to get rid of
the exhaust. MotoGp has stubby little pipes or practically empty pipes(no
muffler really) Dual exhaust is also more efficient for a big horspower
engine. Another thing is the shapes of modern fairings are not the best.
Round like a globe is the best shape and we are using a wedge really. It's
all to make the bike look good to the public I guess. So they do undertail
exhaust for me I guess.

Steve
 >> Stay informed about: Underseat Exhaust ... they have gone too far 

>
> You couldn't flip the engine over.

I meant as in rotating the cylinder&head 180 degrees around a vertical
axis...

cya
Sean
 >> Stay informed about: Underseat Exhaust ... they have gone too far 

On Sat, 11 Nov 2006 00:09:07 -0500, rendell
<felloffmybike.TakeThisOut@and.crashed.com> wrote:

>
>>
>> You couldn't flip the engine over.
>
>I meant as in rotating the cylinder&head 180 degrees around a vertical
>axis...
>
>cya
>Sean

The standard of transverse engines in both cars and bikes has been to
have the intake in the rear, and the exhaust in the front and wrapping
under towards the rear. My Mazda3 car, though, has things switched
180 degrees like you suggest.

--
Brent Mooney sportridersATsasktelDOTnet
'86 CBR400R Aero Little Bikes - Big Fun
'90 YSR50 racebike x2 http://www.smra.ca
 >> Stay informed about: Underseat Exhaust ... they have gone too far 

Brent Mooney wrote:
> On Sat, 11 Nov 2006 00:09:07 -0500, rendell
> <felloffmybike DeleteThis @and.crashed.com> wrote:
>
>>> You couldn't flip the engine over.
>> I meant as in rotating the cylinder&head 180 degrees around a vertical
>> axis...
>>
>> cya
>> Sean
>
> The standard of transverse engines in both cars and bikes has been to
> have the intake in the rear, and the exhaust in the front and wrapping
> under towards the rear. My Mazda3 car, though, has things switched
> 180 degrees like you suggest.
>
> --
> Brent Mooney sportridersATsasktelDOTnet
> '86 CBR400R Aero Little Bikes - Big Fun
> '90 YSR50 racebike x2 http://www.smra.ca

Perhaps the Mazda is better designed.

All I can think of is the warm engine would better protect the intake
side in cold or wet weather (if the intake was at the rear). There has
to be another reason...

cya
Sean
 >> Stay informed about: Underseat Exhaust ... they have gone too far 

"rendell" <felloffmybike DeleteThis @and.crashed.com> wrote in message
news:3dadnTZfs6pHTsjYnZ2dnUVZ_qidnZ2d@storm.ca...
> All I can think of is the warm engine would better protect the intake
> side in cold or wet weather (if the intake was at the rear). There has
> to be another reason...
>
> cya
> Sean

I totally missed what you were suggesting I suppose it going to have
to do with scavanging exhaust gases away, possibly even the resonance
frequency of the intake box and ram air, Now that you mention it it is a
very interesting question.

Steve
Pondering the nature of the universe.
 >> Stay informed about: Underseat Exhaust ... they have gone too far