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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › OS 91 HZ-R after 5 gallons.
04-28-2010 10:31 PM  8 years agoPost 21
Russ McCutcheon

rrNovice

Ridgefield, WA

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Hi Jim,

According to OS you can use just one .2mm shim with 30. I have not tried it but I bet its a little smoother and as per OS is easer to tune with both shims. It also might make no difference either way, if you run it with only .02mm report back with your findings.

Russ McCutcheon

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04-28-2010 11:13 PM  8 years agoPost 22
speedys4

rrApprentice

Beaverton, OR

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My current HZ-R is my 3rd 91 HZ motor, the previous 2 was a non-pump version. I ran 30% Cool Power on all of the motor with .02 shim and I don't have any issues tuning the motor.

Looks like we live close enough in the same Oregon weather, temperature and elevation

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04-29-2010 02:42 AM  8 years agoPost 23
Jim Hansen

rrApprentice

Waimea Valley, HI.

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Yes i fly some times @ Nike under the power-lines and out in NE Portland i have wanted the regulator since i talk to Jason back in
Sept also i just ordered the conversion kit. I run my same Engine that i got back in January replaced crank, rod, wrist pin , piston and ring and not to forget the bearings. LOL this is the 91 HP Align Blue Head i had the HZ OS and sold it. So not sure about the shim but i think i will measure it. Thanks for the replies Russ & speedy.

Jim

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04-30-2010 07:47 AM  8 years agoPost 24
sumonzu

rrApprentice

San José - Costa Rica

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Setup needle please either for braking and final tuned run.
I'm going to upgrade my HZ with the new carb!
Any suggestion about the tuning will be highly appreciated :-)

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04-30-2010 07:57 AM  8 years agoPost 25
Russ McCutcheon

rrNovice

Ridgefield, WA

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High Speed start with 2 1/2 turns open, mid range start with 1 turn open, as per OS manual.

Russ McCutcheon

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04-30-2010 05:35 PM  8 years agoPost 26
cdrking

rrElite Veteran

Seattle

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Here's the man in action. He's the king of smooth smack.
(This is not the new engine)

Watch at YouTube

To hover is divine, the alternative is rather PLANE.

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05-01-2010 06:27 AM  8 years agoPost 27
Russ McCutcheon

rrNovice

Ridgefield, WA

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Hi Jeff, That was the SZ pump, Still a great engine!

Russ McCutcheon

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05-01-2010 08:17 PM  8 years agoPost 28
cdrking

rrElite Veteran

Seattle

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Russ,

Are you running a fuel magnet or a standard clunk?

Jeff

To hover is divine, the alternative is rather PLANE.

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05-01-2010 10:39 PM  8 years agoPost 29
Russ McCutcheon

rrNovice

Ridgefield, WA

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Standard clunk along with a header tank.

Russ McCutcheon

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05-02-2010 02:55 AM  8 years agoPost 30
n808

rrVeteran

Seattle, WA - USA

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Silly question perhaps, but is it possible a fuel magnet can sometimes not supply enough fuel to a wide open throttle 91, or that the tank pressure somehow gets "diffused" or weaker through the foam?

Karl.

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05-02-2010 03:29 AM  8 years agoPost 31
Kevin Dalrymple

rrKey Veteran

Indianapolis

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Silly question perhaps, but is it possible a fuel magnet can sometimes not supply enough fuel to a wide open throttle 91, or that the tank pressure somehow gets "diffused" or weaker through the foam?
If the fuel magnet breaks down it will start to starve the engine. There is no foaming in my tank. I had foaming when i had a SZ with an OMI mod. I fixed the foaming by moving the check valve further from the engine. I found that the pressure would pulse in the tank and swirl the fuel around causing it to foam. the further i moved the check valve the less pulsing in the fuel tank, but i still had great pressure.

The OS check valve is to be 10CM away from the nipple of the engine. The OMI suggests 4CM away.

As far as not supplying enough fuel, i know the spray bar ID is to small. One the OMI and the OS carb it is bigger. You can tell this buy doing big loops repeatedly and you can hear the motor "ping" as it dose not have enough fuel at the top of the loop. The spray bar is the restriction, not the needle adjustment. The "pinging" is more present in the summer when the outside temp is over 85 degrees.

Last summer i drilled out my spray bar on my stock HZ and most of the "pinging" went away. On the new OS carb and OMI carb there is also a cut back done to the spray bar to allow fuel to flow at wide open throttle.

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05-02-2010 04:34 AM  8 years agoPost 32
Dr.Ben

rrMaster

Richmond, VA, USA

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Actually, the angle cut in the spraybar is there is improve the suction signal required to cycle the diaphram in the reg. The early prototypes of the OS reg didn't flow fuel well until the angle was cut. I recall the conversation with Mr. Helms when he told me how he was going to recommend to OS that the bevel would be needed in the OS reg just as it is in the OMI/Cline set up.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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05-09-2010 06:40 PM  8 years agoPost 33
tkcpa

rrNovice

Franklin Square, NY

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Hatori SB 18
Can i run this pipe on the OS 91 HZ-R?

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05-09-2010 09:26 PM  8 years agoPost 34
thenewguy

rrElite Veteran

Corvallis, Oregon Where there is liquid sunshine!

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I am running the SB 18 on my O.S.91 HZ. I have the new carb convertion kit. Runs very nice makes good power.

Chris

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05-13-2010 01:35 AM  8 years agoPost 35
knightofcarnage

rrElite Veteran

chicago

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Hey guys few simple questions.

1) What is a good Temp for the motor (F please), I'm currently breaking it in and its @ 93F
2) What are your needle setting, just need a ballpark what i should aim for.
3) What heads speed you guys recommend on hover/idel1/idel2

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05-13-2010 03:17 AM  8 years agoPost 36
knightofcarnage

rrElite Veteran

chicago

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Hatori SB 18

Can i run this pipe on the OS 91 HZ-R?
Well the proper pipe is SB20 FH-2 its longer.

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05-13-2010 02:15 PM  8 years agoPost 37
marc8090

rrElite Veteran

Long Island, N.Y.

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Well, I have 2 of these and the needle settings are not the same so you can't set it that way. Anyway, both are running great but still a little rich. One is 2 turns and 4 clicks on the high, 7/8 on the mid. The other is also 7/8 on the mid, but 1 and 3/4 on the high. Cool power 30%, OS #8, SB-20. No extra head shims. Basically sea level for altitude. Headspeed depends upon gear ratio but I'm at 1950 in a T-Rex 700. Temp, no idea. I don't check that. Besides, it's almost impossible to get an accurate reading. You'd have to fly it hard, land, and measure as quickly as possible. Not very practical.

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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › OS 91 HZ-R after 5 gallons.
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