Novarossi .91HR-3D-3N Owners Thread

[stuartmp74]

Hi Guy's,

I thought I would give you all some feedback on how my N91 is going.
This is my first 90 size heli and the N91 is the first 91 size engine I have had anything to do with.

I must admit that after my heli was run-in I did initially try to get the engine to produce maximum power. I was however a little disappointed with the result. It seamed to get to hot and was not producing as much power as I would have thought a 91 size heli would have. Keeping in mind that I have been flying the N57 for two year now.

So I just see the engine up to run within the temperature ranges as specified in the manual. I then just flew my T-700 to get used to a 90 size heli.

Well to my surprise after I had put about 18 tanks through it the Engine just came alive. (I had mad no changes to the carb at all) it was like unleashing a wild best this power just suddenly seamed to come out of no where needless to say I am very happy with the N91 current performance.

I refueled 4 more times that day and the Engine just kept on pulling like a teenager who just discovered his dad's porno collection.

Thing is it is still blowing heaps of smoke and the temps are only about 46 and 108 degrees c.

Just think what it would be like with the tuning stop on.

----------------------------------------------

Please keep in mind that if you own this engine it is very important to ensure a perfect seal between the carburetor and the crank case.

You must compress the carburetor o-ring correctly into the crank case to ensure a perfect seal.

Follow this procedure and you will ensure a perfect seal.

1- Under screw the locking carburetor screw.

2- Using a medium size screw driver or a main shaft so you can easy make a lever between the carburetor and the fan shroud and then push the carb down quite firmly.

3- When the carburetor is pressed down, now at the same time lock the screw , now the carburetors o-ring should be seated very well inside the crank case.

I hope this feedback help you all.

[gorn]

Stuart
That is pretty well how mine went too.
Just seems that the Nova stays tight for quite a bit longer during break in.

Now if I could just keep the exhaust o rings in good shape.... lol

[MartinS819]

Originally Posted by stuartmp74

...
Please keep in mind that if you own this engine it is very important to ensure a perfect seal between the carburetor and the crank case.

You must compress the carburetor o-ring correctly into the crank case to ensure a perfect seal.

Follow this procedure and you will ensure a perfect seal.

1- Under screw the locking carburetor screw.

2- Using a medium size screw driver or a main shaft so you can easy make a lever between the carburetor and the fan shroud and then push the carb down quite firmly.

3- When the carburetor is pressed down, now at the same time lock the screw , now the carburetors o-ring should be seated very well inside the crank case.

I hope this feedback help you all.

LoL Stuart, you beat me to it! I'm getting so close to firing mine up! Two more paychecks and I can start her up!!!

[JM]

Is anyone using the Hatori SB-20 or the FUNTEC 3D pipe with this engine? I'm planning to break mine in using the "ALIGN" pipe.

[stuartmp74]

Hi Guy's

Thought you all might like to see the N91 Engine in action.
Here are three video's I found on YouTube of 'Lukas Riva'
dialing in the N91.

The engine looks to be producing some good power.
Once the Engine is fully run in hopefully he will post some more.

Mine did take 18-20 Tanks to fully loosen up and become a wild beast.

Anyhow here are the Links

[ame]http://www.youtube.com/watch?v=W9JfiZPMQqk[/ame]

[ame]http://www.youtube.com/watch?v=M19jlaBiUlk&feature=channel[/ame]

[ame]http://www.youtube.com/watch?v=IIoPN8JRyuo&feature=channel[/ame]

[gorn]

That part 2 flight was awesome.
Thanks Stuart

[ininverno]

for you all some new Lukas Video we make yesterday with Rex 91 v2 , more of 20 fly , break in finish and nice carb setting.


[ame]http://www.youtube.com/watch?v=7BK_EV9FD-A[/ame]

[ame]http://www.youtube.com/watch?v=e5X3ltiOKAc[/ame]

[paddlesR4canoes]

Hey Luca, thx so much for posting the videos, i too just finished breaking in an Rex 91 R2! The thing is off the hook!

One question for you i have my High (2.25) and Mid (1.5) needles at the standard settings as i have pushed the 5 to 6 tanks for break-in and now starting to open her up but the idle is not as smooth as i am used to on say a YS or OS and is somewhat of a challenge, i have the throttle set just above the 1st mark where it should be for the engine to run, but if i keep the idle screw at 1.5 per the manual it is just wayyyy to rich i have had to squeeze it down to about 3/4 of a turn, now the motor is nice and cool :-) makes great transitions tested performing aileron tic tocs which it does without trying and the carb is down as far as it can go but it just idles rough and has to be somewhat of a higher idle than i would think, if this is standard for the engine then ok...but would love to hear your thoughts.

Have tried Enya 3, HR2 plugs
Byron Rotor Rage 30%
and shimmed per the manual for 30%

Also could you tell us where you and Luca wound up on the needles after breakin. THX for your help. Have a great day.

[mrwhipels]

Here are some pictures of my internals after 15 flights. It appears that is has been run lean. It is hard to tell though. Most of the sleeve still has it's cross hached pattern but at the top there is a heavy glaze with a little bit of scoring. The piston also has a little bit of scoring on it. My engine was not producing much power. It would bog at 10 degrees pitch on my 700.

I think I am going to try to hone the sleeve and put a new ring it and try to break it in all over again.

Also should the screw on the carb be touching the crank case. I find it will touch if the line on the carb match's up with the line on the crank case. Notice how close I am in the last picture. luca said to remove the top o ring from the carb he sad that is how the new engines are comming. Now that the oring is removed it is .5 mm away

What do you guys think?

[ininverno]

Hi mrwhipels about your situation I look the pictures and i am sure engine still perfect, don't remove the ring , will be damaged.
The piston and the linear tell me that engine is pratically new, I am sure
that engine need run to become more powerfully. If engine runs lean the top of the piston will be as sand blated, that I assume is not your cases.

about Lukas and other Novarossi pilot I have similar record.
idle open 1 and 1/4
medium 1.5 to 2 depending of fuel
max 2 to 2.5 depending of fuel
Some use HR2 plug, Other use OS8.
I thinks that the enya 3 is probably to hot for the rex 91, try change it.
About all other setting are the same per manual info.

One important thinks is the fuel line tubing, this can effect the engine performance, the fact engine is not prssurized need that the fuel line be in perfect condition. If you too far of the settig upper, check the line tubing or the fuel magnet maybe try change it and see.

let me know if you need extra information.
Luca

[macsrgreat]

mrwhipels,

quick question so you have removed the top o-ring from the carb? and no seal problems? Just curious how it works for you with out that. It definitely would sit lower in the space.

[mrwhipels]

I have not flown it yet with the o ring off. I am working on putting the engine back together right now and getting it back in the heli.

Luca from lynx said to remove the o ring. He said the carb will sit lower and create a better seal with lower o ring which make sense. He also said that is how all the new engines are shipping from the factory.

Hopefully it doesn't rain tomorrow or I will try it out and let you know

[macsrgreat]

Hey thanks for the info, i wondered about that will wait to see what you say, but he o-ring in the intake i would think is the really important one...

THX again look forward to your flight report. :-)

Rus.

[MartinS819]

Kinda related...I installed the Lynx clutch on my engine and took a few pics. This thing looks so sweet! Here's the link to my post with the pics:

https://www.helifreak.com/showthread.php?t=210980

[ininverno]

During last fly test with Lukas we discovery that in the rex91 when removed the outsider carburetor O ring, engine was better for many aspects.
In the Novarossi engine the carburettor seling is makes by 2 o ring, one visible by outside one visible removing completly the carb, placed into the intake near the crank shaft.

Now I advise you to try, remove the one visible form outside, than insert the carburetor completly in.
Also in the same time we discovery that the OMI fuel magnet makes some issue in the carburetion setting. We remove it and we placed the normal tank clunk. Immediately we discovery the carb setting very rich compared before, than we re tuned and the carb setting coming better consistent.

Hope my experience can help you too.
Any question are welcome.
Luca

[macsrgreat]

Hey Luca!

Thx so much for the info, i really had wondered about that!, so i will be doing this tonight! The R2 makes a ton of power but the idle was really inconsistent and really thought it was the o-ring, so thanks again for all the great info.

Take care.

Rusty.

[Gator1]

Hello Guys,

I have been flying airplanes and helis for over 20 years. So i like to think I know a little bit about rc engines.

I have been running the Novarossi 91 in my Trex 700 and the Novarossi 57 in my Trex 600 for a while now and have to say switching to Novarossi has been great.

I think all the comments that Michael Roedig posted on the 57 thread were right on the money, I couldn't have said it better or will even try.

And the customer service that I have experienced has been OVER THE TOP.Luca from Novarossi and Zach from Lynx have always answered all my questions and concerns quckly and expertly.

I am now and will always be a loyal and devoted Novarossi and Lynx customer.

By the way everybody, both these motors make STUPID POWER with great reliability and ease of adjustment.

If anyone out there is having trouble I recommend emailing the people that can help and I promice they will help you as they helped me.

One last thing anybody that is having the same kind of trouble with the stripping of screws or breaking on the Trex 700 that I had needs to go to the Lynx website and order the replacement screws they offer they are the best.


Thanks
Mike Gaeta

[mrwhipels]

Here you go mine is up for sale. I am going with os.

http://cgi.ebay.com/ws/eBayISAPI.dll...m=320533875558

[MartinS819]

Broke mine in this week! Ended up with 1.25, maybe a tad more on Idle, 1.5 on medium and 2 +3 clicks on high. Still making pretty good smoke so I can lean it out a bit more. I did end up taking out the top O-ring on the carb per Luca's instructions. Flipped into IU for the first time today and she kicks butt @ 1900rpm headspeed. I can't wait for IU2 and get to 2050, but I'm gonna wait for the Lynx Spindle Screws before I push her too hard, especially since she's a used bird. How's everyone's 91 doing?

Thanks,
Martin

[gorn]

well, I had removed the top O ring on my 91 as per Luca's suggestion.
And.....it leaked fuel everywhere, and made the motor almost cut out a few times.

So I have put the O ring back in place again, as Ive never had a fuel leak like that before.
Ive always had problems with the crappy muffler O rings failing in under 10 flights.
Thats fixed now, thanks to a suggestion from Luca.

I had checked that the carb was indead pushing past the internal crankcase seal, could definately feel it pop through.
I could still feel it pop through with the top O ring in place, so mine will stay that way.

I run mine at 2100rpm in my 700, and I love it.
The motor itself has been dead reliable and easy to tune, with no more vibes than a YS or OS ( yes I have owned both the HZ and SR, so I can compare)
Definately makes more power than either of the other motors.

I will be sticking like glue to Novarossi motors and pipes from here on in.
Just get those new muffler O rings made pronto guys! lol