Cherokee Flyer

Anybody putting a velocity stack on their Saito 100? If so what has been your thoughts?

Larry

XJet

I've put velocity stacks on both my Saitos.

It reduces the fuel consumption and stops them spitting fuel out the intake.

The fuel-saving alone pays for the venturi in just a few months if you fly as much as me.

Ram Jet

I believe a velocity stack is a welcome addition to any internal combustion engine. Especially when you think of all the turbulence in the incoming air charge immediately behind the propeller.

Bill

jib

Definitely a good thing. The problem is finding them as small as we need them.

Jack

XJet

The velocity stack for the Saito is a stock Saito item. The GK versions used to come with velocity stacks. I bought mine from Horizon.

w8ye

My Feedback: (16)

In the series of engines including the Saito 100, the 100, 115, & 125 do not come with a velocity stack from the factory.

However the Saito 50 velocity stack used on the 50, 56, 62, 72, 62, 65, 80, 82, & 91 will bolt directly to the engines mentioned above.

Here is the one they use

http://www.horizonhobby.com/Products...odID=SAI50GK93

Ken6PPC

I make my velocity stacks. I drill out aluminum round stock, and turn them to the OD that I want. You can usually find something close enough to the right size if you look.

Cherokee Flyer

Thanks guys; what do you you use as a seal from the stack to the carb as the stack sets off the carb face?

L.

Ken6PPC

I bought some Vitron O Rings from the local auto supply store for my Saito velocity stacks. The ones I make, I simply JB Weld them on, and don't need an O ring.

jib

If you could roll that top edge around to be at least 180° you would get even better flow, but what you are doing is far better than a stock straight pipe.

Jack

XJet

I was just about to say exactly the same thing.

Those who don't have access to a lathe could create a practical velocity stack by using a piece of suitably sized tubing and cutting the free end at an angle of at least 45 degrees. This will also reduce the size of the choking vortex that would otherwise form at the end of an unflaired tube.

But the geniune Saito ones are so cheap it's hardly worth farting around with DIY.

togatoga

My Feedback: (42)

Someone stated that you lose rpms with a velocity stack on a saito. My 82 seems to exhibit this. The saito velocity stack is a pressed fit flared aluminium tube onto a flat metal plate which is secured by screws.You need to fill in the gap meant originally for the choke. One dropped off inflight . Next flight i noticed improved performance.Ground tached it and it showed a 200rpm increase without stack. Strange.

XJet

Are you using an O-ring between the stack and the carby body? You should be.

I've not noticed any reduction in RPMs but I have noticed a reduction in fuel consumption.

Cherokee Flyer

O-ring size?
Thanks
L.

w8ye

My Feedback: (16)

I look at the assortment of Orings at the hardware store with my Saito in my hand and select one that looks about right.

Chancho

Gents,

I have the Velocity stack from Horizon Hobbies on my 100 and 125. I haven’t tried it on my 115 yet. For the 100 I noticed a fuel consumption improvement along with a cleaner cowl from the overspray being sucked in the engine vs. sprayed inside my cowl. For the 125 I opened the hole to match the ID of the Carburetor. By doing so it made the walls so thin it actually came off its fitting. Nothing a bit of epoxy didn’t cure. To avoid buying a special O ring I use red high temp RTV gasket sealant between in between the stack and the intake. No issues at all.

Best of Flying

Phil

DarZeelon

Larry,


If you had any aspirations of actually getting more power from your engine, you can pretty much forget them...

My post #6 in [link=http://www.rcuniverse.com/forum/m_5780630/anchors_5780630/mpage_1/tm.htm#5780630]this thread[/link], sums it up and will deprive your sails of any wind...


A so-called 'velocity stack' is, however, good as a fuel-saver and helps keep your plane cleaner.