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🏠Home💠RC Main Discussion › Old Rossi 60 Helicopter Engine
05-06-2020 10:58 PM  22 days ago
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HELIBROKE

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Old Rossi 60 Helicopter Engine
Anyone out there have the set up instructions, for the above Engine.
It is a Two needle Carb, with a idle screw adjustment.If so, please contact me !!
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05-07-2020 02:18 PM  21 days ago
KJH

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Interlochen, MI, U.S.A.

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05-07-2020 03:39 PM  21 days ago
wjvail

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What do you need to know? I happen to have a Rossi .60 sitting in front of me (actually a .67).

At this point it's probably worth mentioning my Rossi engines didn't ship with traditional instructions. There is a generic parts list and a sheet of instructions that say "don't stick your finger in the prop".

"Well, nothing bad can happen now."
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05-07-2020 04:27 PM  21 days ago
Notar

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Try searching Rossi carb settings
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05-08-2020 01:33 AM  21 days ago
Rojoalfa

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From another forum...

RossiEnginesUSA
CARBURETOR ADJUSTMENT

Rossi engine carburetors have two needles, adjustable for idle speed and maximum speed. The max speed setting is between 1.2 and 2 turns open from the closed position.
First adjust the max speed with
the throttle fully open. Next, close the throttle to run the engine at idle speed. The idle speed adjustment is based on where the highest rpm is achieved while the engine is idling. If the engine loads up and quits while idling, the idle adjust screw should be closed to make a leaner setting for the idle fuel mixture.
If the idle screw is closed in too far, the engine will quit suddenly at idle. The idle screw is very sensitive and should only be changed in 1/8 of a turn increments to fine-tune the engine.

After the idle adjustment,
check the max speed and transition from low to high.

When the idle mixture and max speed needles are adjusted, the engine will have fast response and transition from low to high speed.

/
Saludos cordiales,
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05-08-2020 04:54 PM  20 days ago
wjvail

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Notar Try searching Rossi carb settings
I'm not sure you will find hard numbers for a Rossi carb. Pictured are two different sized carbs that fit my .67. Obviously the needles will be different for each.

The best I can remember from Rossi on how to turn their carbs was to open the needles a lot and then do something good.

"Well, nothing bad can happen now."
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05-09-2020 04:17 PM  19 days ago
Rojoalfa

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I don't know why this instruction manuals don't care about initial neddles adjustment.

It is a pain in the neck try to disassemble this carburators and then... Surprise!!! ... You don't have information to put the needles on initial setup.

Base on initial setup for high needle, 2 turns, I would do same adjust like OS.

Close barrel. Then close idle needle. Open needle doing 1-1/2 turns.

Run the engine and finish the adjustment.

/
Saludos cordiales,
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05-09-2020 04:59 PM  19 days ago
KJH

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Instructions from post #2 suggest 4-5 turns out (from closed) on high speed needle, as an initial setting.-Kevin
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05-09-2020 08:01 PM  19 days ago
Rojoalfa

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KJH Instructions from post #2 suggest 4-5 turns out (from closed) on high speed needle, as an initial setting.
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Correct!

But... What about the idle needle or screw ?... Nothing..!

You need to figure out...

If you mess with this idle screw, there is no way to know what is the initial setting.

So, if we have 5 turns on high needle, let say 2-1/2 turns on this idle screw...

/
Saludos cordiales,
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05-09-2020 10:09 PM  19 days ago
wjvail

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Rojoalfa If you mess with this idle screw, there is no way to know what is the initial setting.

So, if we have 5 turns on high needle, let say 2-1/2 turns on this idle screw...
I would be nice if there were better instruction and ballpark settings for all of Rossi's carbs. But Rossi engine have always been somewhat fringe engines designed for performance, durability and somewhat more experienced modelers. Their instructions seem to have been written for modelers that don't need a lot of help tuning a motor.

I was working in the shop today on another of my helicopters and pulled the slide out of my Rossi .67. It appears that a good starting point for the low speed needle is "about 1/2 way". This is how the carb was shipped to me.

As for the high-speed needle, the threads appear to be quite fine and I would expect a ballpark setting around 4 1/2 turns out. Engines for this era came with fine pitch threads that typically require more aggressive adjustment to effect a change. By comparison OS's needles come with very course threads and a small adjustment goes much further.

"Well, nothing bad can happen now."
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05-09-2020 10:34 PM  19 days ago
Rojoalfa

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wjvail It appears that a good starting point for the low speed needle is "about 1/2 way".
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Very good.

Now, for this "half way"... We need to know how many turns need the idle screw to reach such "half way"...

/
Saludos cordiales,
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05-10-2020 03:04 AM  18 days ago
wjvail

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Rojoalfa Now, for this "half way"... We need to know how many turns need the idle screw to reach such "half way"...
Half way across the inlet. There is no number of turns. There is nothing to reference that to. Just set it to about half across the inlet (as pictured) then adjust as required.
"Well, nothing bad can happen now."
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