ram3500-RCU

My Feedback: (221)

I can tell you that the 250 runs well without it. I have run one with the original 'top hat' ignition, with the electric pump, and it runs very good. I would not run a Moki without the pump, but I consider the Turbulator an expendable option.

zzw26n

My Feedback: (45)

Thanks .......

Which Fuel Pump is everyone using?

ram3500-RCU

My Feedback: (221)

APS PowerFuel 380HV

Scott Prossen

You get that at Vogelsang.

http://www.teamaeroscale.com/apsfuelpump.html

He's the best!

Maxam

My Feedback: (62)

The turbulator has made my 2 215's run so evenly, all cylinders are within 5 or so degrees of each other. Vibration is greatly decreased too, due to the even firing.

flatsguide

My Feedback: (1)

Hello,
does anyone know how far the carburetor intake end, were one would mount a velocity stack , is from the face of the firewall on a 150/180? In front or behind the FW ? Updraft, down draft, side draft?

Thanks Richard

meshari14

My Feedback: (9)

Hello Guys
In the next few days will received my moki 250-5
Actually this is the first Radial engine for me ,so I need some advice from you
1- What is the best prop for Break in 2B and 4B prop (Scale) for normal use ?
2- I have Redline and Mobil 2 stroke oil, which one of them is better for this engine and fuel ratio ?
3-For the best way break in Procedure on the bench or from the box to sky?Lol
Thanks for all
Meshari

wphilb

My Feedback: (10)

Richard, the carb points straight back towards the firewall on the Moki 150, since I don't know the length of the velocity stack I can't answer the question definitively but I have opened holes in both my firewalls to allow airflow to the carb due to its closeness withe the firewall. I would be very surprised if you did not wind up with the velocity stack going into the firewall.

If needed I can easily measure the carb face to radial mount back face distance on one of my engines that currently dismounted. Since I don't get regular reminder emails of the thread reliably, pls PM me as well so you don't wait forever....

Whit

Maxam

My Feedback: (62)

Meshari, Get the fuel pump and turbulator. Very worth it. Use a 33x16 or 32x 18 prop. Redline works well as well as Amsoil Interceptor. -Tom

reyn3545

I thought the turbulator wasn't useful on today's engines.

Maxam

My Feedback: (62)

Only on the 150 since 2009 is it not useful. The inlet track was altered in 2009 on the 150. It is current for the 215 and 250, all versions.

reyn3545

makes sense. Thanks.

flatsguide

My Feedback: (1)

Whit, Thanks for the info. It appears that I'll have to go through the FW if I use a velocity stack. Still on the fence about getting a Moki. Nothing to do with it's maintenance but my limited flying experience.

Regards Richard

MarkShapiro

My Feedback: (52)

My 250 has run flawlessly for years right out of the box. No turbulator. I did add a fuel pump although probably not necessary.

ram3500-RCU

My Feedback: (221)

I don't use velocity stacks or Turbulators, and my engines run fine, (with pumps). Don't run them rich, keep the valves adjusted, run premium gas, and DON'T UNDERPROP..

ram3500-RCU

My Feedback: (221)

Good to know. Thank you.

ram3500-RCU

My Feedback: (221)

They are wonderful engines for there low RPM torque for turning those big scale looking props, and for that unmistakable radial sound. However, a prop strike for an engine with a gear box is a very serious event. Much more serious than for a direct drive 2-stroke IMO. You are wise to consider this before you put one of these in the air.

"Take offs are optional, landings are mandatory" they say.

Maxam

My Feedback: (62)

Moki's are direct drive. There is no planetary like the Rotec or larger Pratt and Whitney's /Wrights. There certainly is a gear driving the ring cam. It is true a moki will not survive a bad crash with cylinders being sheared off. Makes me sick to even think about it....

flatsguide

My Feedback: (1)

Gary,." However, a prop strike for an engine with a gear box is a very serious event. Much more serious than for a direct drive 2-stroke IMO. You are wise to consider this before you put one of these in the air." Hence my worry. I live over two hundred miles from a field that I can fly from so don't get much stick time. However I do log a bunch of Jet time on the Real Flight stimulator :-) and getting good enough to grease em on most of the time. MOST being the concerned worry. Still it is not like flying the real model.

GeorgiaFlyer

Is anyone using Amsoil Dominator?

ram3500-RCU

My Feedback: (221)

Thanks for the correction.

ram3500-RCU

My Feedback: (221)

WOW, I wouldn't get much stick time either. You're a real trooper. Hope you do get to experience a Moki in the future.

flatsguide

My Feedback: (1)

I should clarify the above...Over two hundred miles round trip. still a long way to go. A MOKI in my future. I like that.

meshari14

My Feedback: (9)

Thanks guys for responded
In fact, I got some answers, but I need more information
I read some of words that confused me (Fuel Pump , turbulator )
Do I have to buy any parts that doesn't come with the moki 250?
As for the prop, what about Biela prop?
Any other tips

Maxam

My Feedback: (62)

The fuel pump and turbulator are accessories that are made to improve the performance of the 215 and 250 engines. The fuel pump addresses problems with the pulse pump that causes the Walbro carburetor to pump fuel. Some work well, others do not. Also grease can accumulate in the pulse tube to the carb resulting in less fuel being pumped and therefore a lean run causing overheating and loss of power. The turbulator was invented by Detlef Kunkle in Germany who has deep knowledge of the Mokis but was dissatisfied with unequal distribution of fuel to the cylinders. Many of these engines suffer negatively in this regard. The turbulator swirls the fuel in a way to greatly improve engine running qualities, which result in cooler running, more power and more even running at all throttle settings. I have owned 3 moki engines, a 150 (pre 2009), and 2 215's. All three responded greatly to the turbulators use as well as the fuel pump. -Tom