Page 2 of 3
Re: exhaust bhp v torque
Posted: Tue May 24, 2011 12:06 am
by lifes a drag
sean brady scooters wrote:relately low revs and max torque is where its at for most road scoots,together with reliability and reasonable fuel consumption...
for race machines or indeed fast road scoots ,its all about max power and so revs...and for these machines really long term reliability and fuel consumption are just secondary considerations ..
sporty scoots are regulary stripped down and checked over as a matter of course at certain intervals and fuel consumption/MPG is not even considered...
how many racers worry about the cost of maintaining their motor or the MPG ?
to those that want and seek some sort of balance between a std scoot and a racer it will always be a balance and compromise ( depending which way they ere )between not only power and torque (drive ability ) but also other factors such as
reliability ,mpg ,and general running /maintanance costs ..horses for courses..hey .
thats right sean , new rings 5 houres new piston every 10 to keep them running to the optimum spec
Re: exhaust bhp v torque
Posted: Tue May 24, 2011 6:37 pm
by mickdale
was curious as one exhaust with good rev on and a nice big curve had medium torque
(anyone know how to upload a adobe dyno scan)
cheers
mick
Re: exhaust bhp v torque
Posted: Tue May 24, 2011 11:08 pm
by mickdale
Re: exhaust bhp v torque
Posted: Wed May 25, 2011 6:58 am
by soulsurfer
Interesting.
How can that be a Taffy copy
What's the motor spec and what's the 4th (pink) pipe, AF Clubman?
Re: exhaust bhp v torque
Posted: Wed May 25, 2011 9:05 pm
by mickdale
taffy copy - saigon scooters - expansion and tailcan mm identical but slightly shorter header pipe - was gonna stick another 1/2" - 1" and have same as taffy
ts1 230cc std with 1.5mm off base to lower timimngs
48mm clubman with header pipe going from 42 - 48mm (might be too short?)
cheers
mick
Re: exhaust bhp v torque
Posted: Thu May 26, 2011 5:59 pm
by phil23fair
Mick,
What carb were you using for these dyno runs?
Cheers
Phil
Re: exhaust bhp v torque
Posted: Thu May 26, 2011 8:34 pm
by mickdale
phil23fair wrote:Mick,
What carb were you using for these dyno runs?
Cheers
Phil
30mm phbh open mouth under full panel
lth manifold
bgm reeds with yamaha std (metal) petals
AV266 x2 top clip
52 pilot
145 main (rich)
21 / 46 sprockets (4.38 final drive)
now using 20 / 47 (4.7 final drive) for the moment
Re: exhaust bhp v torque
Posted: Thu May 26, 2011 8:36 pm
by mickdale
if you look at the taffy and taffy copy runs they are identical, just further up the rev range on the copy due to the slightly shorter downpipe/header pipe
the ron moss clubman just keeps on going
Re: exhaust bhp v torque
Posted: Thu May 26, 2011 8:48 pm
by phil23fair
Were you using a 40 slide in the carb? The reason I ask is that shortly I will be running a very similar setup to you with the taffy copy pipe and it's useful to have a good starting point for the carb settings
Re: exhaust bhp v torque
Posted: Thu May 26, 2011 8:54 pm
by mickdale
yes 40 slide - was advised any more and could have problems rolling off throttle after a run
on the dyno you can see a blip with the copy
this is common with "tuned" exhausts on ts and rb and hard to lose - if you havent got panels a bellmouth helps smooth out carburation
