RunRyder RC Helicopter Topic - Hirobo Freya OS MAX-91SX Hring C-spec PS

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HIROBO Turbulence - SDX - Freya - Sceadu > Hirobo Freya OS MAX-91SX Hring C-spec PS

big_swede
Senior Heliman
Location: Sweden

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Is that engine ok for a freya evo doing mostly FAI/F3C?
I can get that engine from a friend for free. Comp is good, and it has burned 20liters ( 5 gallons ).
Bearings is nice aswell.

And a good gear ratio for that engine? Is 95/12 going to work?

Thanks

// JR DSX9 2.4 \\ T-REX 450 V2 SE // T-REX 250 \\ // HIROBO FREYA 90 Evo \\

10-27-2009 08:17 PM

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racingstripe
Veteran
Location: Sacramento, CA

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I have the 91SX C-Spec in my Freya.

Great engine, although the Perry pump and 60M carb didn't allow the engine to run consistently for me.

I swapped the carb/pump setup for the one that came on the 91SZ-H PS.

The engine is very consistent and has adequate power for what I do (mostly 3D). Gearing is 12/95.

andy-

Proofread carefully to see if you any words out.

10-27-2009 09:18 PM

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big_swede
Senior Heliman
Location: Sweden

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What whas the probleme with the SX carb/pump? Is it known for be un-consistently?

THanks

// JR DSX9 2.4 \\ T-REX 450 V2 SE // T-REX 250 \\ // HIROBO FREYA 90 Evo \\

10-27-2009 09:36 PM

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racingstripe
Veteran
Location: Sacramento, CA

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Mixture setting seemed sporadic... so from one week to the next I was adjusting the mixture. More annoying was the tendency for the mixture to lean out toward the end of the tank.

Back in the day prior to the release of the 91SZ, it seemed many were spending the money for the OMI cline setup.

Give the engine a go with the stock carb/pump. Recommend using a header tank. If it gives you trouble, bin the pump/carb. Either one of the 91SZ carbs will fit the SX.

andy-

10-27-2009 10:00 PM

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John Benario
Veteran
Location: Atlanta

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The blue head C-spec with the pump/pump carb from the SZ is superb. Do not use the blue head from the SZ. One 0.008 inch head shim. If you want more power raise the exhaust about 0.035 inch.

With the exhaust raised you will have as much power as an SZ.

Neither the original 3 needle non-pump carb or the 2 needle pump carb with the return nipple will be satisfactory. (both go lean)

John Benario

Team highest quality
Futaba radios
Cool Power fuel
John's Ultimate building school

10-27-2009 10:17 PM

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trekrider586
Senior Heliman
Location: Sylacauga,Al

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i have the c-spec with a viper head,cline mod 60m carb going thru a sb18 hatori on my freya x spec.it does really well and produces plenty of power.

it's better to ask for forgiveness than for permission

10-27-2009 10:27 PM

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big_swede
Senior Heliman
Location: Sweden

My Posts This: Topic Forum

So what your saying is that the engine alone is not so good. You realy need the pump and the carb from the SZ ?

// JR DSX9 2.4 \\ T-REX 450 V2 SE // T-REX 250 \\ // HIROBO FREYA 90 Evo \\

10-27-2009 11:48 PM

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TMoore
rrProfessor
Location: Cookeville, TN

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I've got 4 of those engines, all with VH's and Cline BB carbs and they run like scalded apes. What John is saying is that if you want max power out of a C-Spec do what he says but don't fret the small difference between the C-Spec and the SZ. The C-Spec will reward you with smooth power and a big smile on your face especially if you use the 60L carb off of a new HZ.

TM

I thought I wanted a career, turns out I just wanted the paychecks.

10-28-2009 12:06 AM

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big_swede
Senior Heliman
Location: Sweden

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SZ carb from "ronlund" is $159
Viper head is around $100 ?
Then perhaps a new pump..

Os 91Hz new is $399

Perhaps better to get a new Hz..

hmmmm..

// JR DSX9 2.4 \\ T-REX 450 V2 SE // T-REX 250 \\ // HIROBO FREYA 90 Evo \\

10-28-2009 12:25 AM

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racingstripe
Veteran
Location: Sacramento, CA

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Used 91SZ parts here.

EDIT:
there are some viperheads and OMI modified carbs listed in the classifieds as well...

andy-

10-28-2009 12:51 AM

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John Benario
Veteran
Location: Atlanta

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The Viperhead is not necessary. It was designed when the gold head was the standard head. The blue pump engine head is very similar to the Viperhead.

The succession of heads in order of increasing combustion chamber volume is.

gold head
viperhead
original OS hyperhead
blue head
HZ head
SZ head

The Viperhead with the recommended thick and thin shim is similar to the blue head with one thick shim.

John Benario

Team highest quality
Futaba radios
Cool Power fuel
John's Ultimate building school

10-28-2009 01:46 PM

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HIROBO Turbulence - SDX - Freya - Sceadu > Hirobo Freya OS MAX-91SX Hring C-spec PS

big_swede
Senior Heliman
Location: Sweden

My Posts This: Topic Forum

Ah..

So if I just get my hands on a SZ carb, this engine should be fine for some FAI/F3C type of flying?

Cheers

// JR DSX9 2.4 \\ T-REX 450 V2 SE // T-REX 250 \\ // HIROBO FREYA 90 Evo \\

10-28-2009 05:36 PM

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Revolution Models	.	CarbonXtreme	.	Midland Helicopters
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HIROBO Turbulence - SDX - Freya - Sceadu > Hirobo Freya OS MAX-91SX Hring C-spec PS

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