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06-27-2015 04:07 AM  3 years agoPost 1
joshmoha

rrApprentice

midland texas

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My new 105 came with a velocit stack. Shows it in the air duct. Is everyone using these or just leaving it off like the os91? Thanks

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06-27-2015 01:17 PM  3 years agoPost 2
Dan Minick

rrKey Veteran

Columbus, WI

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Everyone I have ever seen has them installed, as well as mine. Why not?

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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06-27-2015 02:06 PM  3 years agoPost 3
Einzelganger

rrKey Veteran

Campbell, Texas

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Yep. Using it.
Again, why not?

Wayne

I love the smell of nitro in the morning.
RIP Roman

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06-27-2015 02:32 PM  3 years agoPost 4
don s

rrElite Veteran

Chesapeake, VA

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I don't use it because I don't want to hack up my fan shroud. Engine runs fine.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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06-28-2015 02:03 AM  3 years agoPost 5
tyfast27

rrApprentice

Dubois, Wyoming

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I had to cut my shroud out but I did try my 105 both with and without the venturi, I would definitely half to say it runs better with it on. It's specifically designed to run with it installed but it still ran good without it as well.

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06-28-2015 12:20 PM  3 years agoPost 6
rcnut

rrElite Veteran

Rockford, Illinois

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I run all of mine with it on!

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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06-28-2015 04:37 PM  3 years agoPost 7
joshmoha

rrApprentice

midland texas

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Ok will use. Thanks

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06-28-2015 05:26 PM  3 years agoPost 8
Kevin Feil

rrVeteran

Newnan, Georgia, USA

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Velocity Stack
Velocity is integral to these engines, if it came with it then you defeat let want to use it to maximize the performance of the engine. The Velocity Stack, acts as a little Mini Supercharger for these engines as well as any performance engine in the Powersport industry. Pull the air box lid of a Street Bike, and you will find Velocity stacks. Basically it Increases Velocity of the air going through the stack as well as decrease the pressure. Increases Volumetric Efficiency. For those applications that require cutting the fan shroud, make sure you make the fit tight around the base of the stack, you want as little gap as possible so you can maximize the fan shrouds purpose which is to take the air from the fan and pack that air and feed the engine. The OS 105 is one strong motor when dialed in.

Kevin

" hollywood3160 "Team Synergy Factory Specialist, Team Futaba,Morgan Fuels, FBL RotorsUnlimited

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06-28-2015 05:32 PM  3 years agoPost 9
Aaron29

rrProfessor

USA

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Does the manual have nothing to say on the matter?

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06-28-2015 07:35 PM  3 years agoPost 10
don s

rrElite Veteran

Chesapeake, VA

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I'll add that I have the new needle holder, and can actually lean my engine out. I don't necessarily want more air going through it.

The manual tells you to install it, and cut your shroud to clear it.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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06-28-2015 07:44 PM  3 years agoPost 11
Aaron29

rrProfessor

USA

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Well in that case. I'd use it. Had they said "optional," then OK do whatever. But that doesn't seem to be the case.

It may run fine without it, but I doubt it's reaching it's potential at best. If you choose not to follow manufacturer recommendations, then any issues or performance problems that arise are to be expected.

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06-28-2015 08:38 PM  3 years agoPost 12
jharkin

rrApprentice

Holliston, MA - USA

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Velocity stacks don't do anything that drastic. They act to smooth the flow through the carb and can be used as part of tuned intake to gain a little power through resonance.

The gains are just a few % though, nothing as dramatic as a tuned pipe, much less forced induction.

The other thing they do on hobby engines is cut down on fuel spitting out the intake, we use them on planks for that, sometimes gaining a couple minutes runtime per tank.

https://en.m.wikipedia.org/wiki/Velocity_stack

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

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06-28-2015 08:53 PM  3 years agoPost 13
don s

rrElite Veteran

Chesapeake, VA

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Still not putting it on. If it ain't broke...

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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06-28-2015 09:55 PM  3 years agoPost 14
Aaron29

rrProfessor

USA

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That's what is so sweet about ownership. You can do whatever you like with it.

But this thread is seeking advice. I'd keep it on the straight and narrow recommended path for that.

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06-29-2015 01:00 AM  3 years agoPost 15
don s

rrElite Veteran

Chesapeake, VA

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I am apparently in the minority for sure. No worries.

I have a hard enough time getting the engine and fan around the plumbing and into the shroud to worry about it.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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06-29-2015 01:45 AM  3 years agoPost 16
Aaron29

rrProfessor

USA

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Your engine your rules.

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