Velocity stacks - SV650.org

16-02-07, 11:31 AM

Hi all, has anybody out there fitted velocity stacks to a pointy sv650.

My old CBR had a lovely looking bank of stacks but the SV basically has none. Now is that because it doesn't need them or because it's a more budget machine and Suzuki couldn't be bothered?

Any help greatly appreciated.

Tapemonkey

16-02-07, 11:37 AM

I think renegade do a set with a modified airbox and filters for the curvey. From what ive read there pretty good

embee · 16-02-07, 05:15 PM

All they are for is to get the length of the induction tract appropriate for the speed at which you want it to be resonant and therefore get extra cylinder filling.

It all depends what the length of the system is as determined by the designers and/or installation. It could be that the length as arrived at in order to fit in the "V" ends where it is now, so doesn't need any extra length.

Adding length makes the system resonant at lower frequency i.e. lower engine speed. It's usually a compromise between max torque and max power.

It does need to be developed in conjunction with the valve timing too.

16-02-07, 10:34 PM

I sent renegade UK an email asking how much they were, 3 weeks later tehy sent me the reply asking which model I wanted them for (which i already statied on the enquirey form), i replied, and i'm still waiting.....3 months later

16-02-07, 10:57 PM

I thought the Renegade products just use Pipercross filters? Check with them they may have a direct replacement???

squirrel_hunter · 16-02-07, 11:23 PM

They cost £90 new from what I remember, thats the stacks, main jets and a filter.

I've only seen pics of the Pipercross filters and they look the same as K&N etc, the renegade filter is simply put a bit of lumpy foam with some mesh for regidity.

I have the kit but have not tried them on the bike yet (and it might be some time before I do; project CBR and all that...) but Viney is the man to talk to.

17-02-07, 12:00 AM

Forgive my ignorance, what's a velocity stack??

17-02-07, 08:52 AM

See link below for a great picture.

The blue 'trumpet' like thing bolted to the carb is a velocity stack, sometimes known as a rampipe. It's said they improve airflow into the engine. The radius on the end smooths air into the carb/throttle body as the right angle on a bare faced carb can actually cause turbulence and make the entry effectively smaller. As far as my limited knowledge on the subject goes, shorter ones promote top end power, longer ones promote torque. Most sport bikes have them, my old CBR had a nice bank of four just under the airbox.

Yamaha have a system on the new R1 that looks very funky

http://www.meccanicacorse.net/galler...03/Picture_496

17-02-07, 03:59 PM

I think the new R1 has ECU-controlled variable length inlet tracts - ie, velocity stacks.

Viney · 17-02-07, 05:27 PM

Renegade are no longer in the UK, they have moved, and to be honest, i havent a clue whats happeing. As for thier kit. The filter was made especailly for renegade. It does not enter the airbox like all otehr filters, and is basicaly a pancake filter that sits across the hole. The 'stacks' where also made in house. I remember watching Jorge at the time trialing different lengths, and then seeing what they done to the power curve. I dont think that they would be available seperatly, and iirc, they are not for the FI bikes, onl the older carbed models.

16-02-07, 11:31 AM	#1
tapemonkey Guest Posts: n/a	Velocity stacks Hi all, has anybody out there fitted velocity stacks to a pointy sv650. My old CBR had a lovely looking bank of stacks but the SV basically has none. Now is that because it doesn't need them or because it's a more budget machine and Suzuki couldn't be bothered? Any help greatly appreciated. Tapemonkey

16-02-07, 11:23 PM	#6
squirrel_hunter Member Mega Poster Join Date: Apr 2005 Location: Sunny Swindon Posts: 3,570	They cost £90 new from what I remember, thats the stacks, main jets and a filter. I've only seen pics of the Pipercross filters and they look the same as K&N etc, the renegade filter is simply put a bit of lumpy foam with some mesh for regidity. I have the kit but have not tried them on the bike yet (and it might be some time before I do; project CBR and all that...) but Viney is the man to talk to. __________________ "A little enthusiastic?" May I add here, GG is awesome and I think I am in love with Stretchie...he rocks my world! SH2 \| 2MA \| GROM \| YSR

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16-02-07, 11:37 AM	#2
Marshall Guest Posts: n/a	I think renegade do a set with a modified airbox and filters for the curvey. From what ive read there pretty good

16-02-07, 05:15 PM	#3
embee Member Mega Poster Join Date: Jul 2003 Location: Warwickshire Posts: 2,801	All they are for is to get the length of the induction tract appropriate for the speed at which you want it to be resonant and therefore get extra cylinder filling. It all depends what the length of the system is as determined by the designers and/or installation. It could be that the length as arrived at in order to fit in the "V" ends where it is now, so doesn't need any extra length. Adding length makes the system resonant at lower frequency i.e. lower engine speed. It's usually a compromise between max torque and max power. It does need to be developed in conjunction with the valve timing too.

16-02-07, 10:34 PM	#4
svrash Guest Posts: n/a	I sent renegade UK an email asking how much they were, 3 weeks later tehy sent me the reply asking which model I wanted them for (which i already statied on the enquirey form), i replied, and i'm still waiting.....3 months later

16-02-07, 10:57 PM	#5
Demonz Guest Posts: n/a	I thought the Renegade products just use Pipercross filters? Check with them they may have a direct replacement???

17-02-07, 12:00 AM	#7
Dysparunia Guest Posts: n/a	Forgive my ignorance, what's a velocity stack??

17-02-07, 08:52 AM	#8
tapemonkey Guest Posts: n/a	See link below for a great picture. The blue 'trumpet' like thing bolted to the carb is a velocity stack, sometimes known as a rampipe. It's said they improve airflow into the engine. The radius on the end smooths air into the carb/throttle body as the right angle on a bare faced carb can actually cause turbulence and make the entry effectively smaller. As far as my limited knowledge on the subject goes, shorter ones promote top end power, longer ones promote torque. Most sport bikes have them, my old CBR had a nice bank of four just under the airbox. Yamaha have a system on the new R1 that looks very funky http://www.meccanicacorse.net/galler...03/Picture_496

17-02-07, 03:59 PM	#9
chazzyb Guest Posts: n/a	I think the new R1 has ECU-controlled variable length inlet tracts - ie, velocity stacks.

17-02-07, 05:27 PM	#10
Viney Member Mega Poster Join Date: Jul 2003 Location: In the shadows to the left Posts: 7,700	Renegade are no longer in the UK, they have moved, and to be honest, i havent a clue whats happeing. As for thier kit. The filter was made especailly for renegade. It does not enter the airbox like all otehr filters, and is basicaly a pancake filter that sits across the hole. The 'stacks' where also made in house. I remember watching Jorge at the time trialing different lengths, and then seeing what they done to the power curve. I dont think that they would be available seperatly, and iirc, they are not for the FI bikes, onl the older carbed models.