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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › Novarossi Input Here
02-27-2010 03:36 PM  10 years ago
Heli 770

rrProfessor

USA.

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Part # NOV14002.
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02-27-2010 04:04 PM  10 years ago
Gernejr

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Miami, Fl

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I understand it to be the o ring that seals between the carb and engine block.could be pushing down a little to much when tighten down the carb holding bolt this causing oring to flaten out with use.
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02-27-2010 04:06 PM  10 years ago
esmoglo

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Florida USA

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Luca,

Ok here are a few pics of my carb and the flat O-Ring.

Then there are these two,

I guess I need to change them as well since I have the engine off. I have had a surging problem not sure what the cause is but I bet the O-Ring was part of the problem.

Angelo
Ugly can be fixed stupid is forever!
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02-27-2010 08:14 PM  10 years ago
GMPheli

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W. Bridgewater, MA USA

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IMHO there is nothing wrong with any of those O-rings.
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02-27-2010 08:27 PM  10 years ago
esmoglo

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Florida USA

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Well the photos are not macro the back of the O-Ring is flat big time and there is small cuts in the rubber. Also when I took off the carb there was no resistance at all, you know like an old O-Ring that's been in position for a bit it just came right out.

Angelo
Ugly can be fixed stupid is forever!
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02-27-2010 09:18 PM  10 years ago
Gernejr

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Miami, Fl

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Angelo i pruty much a prefectionist about everything i work on . I have to agree the o-ring look good but you have them in your hands. What resistance are you looking for when removing the carb? A good o-ring that not dried out will not stick to everything.. You know there is another o-ring down inside engine where the carb goes in that is seals on too. Damn Angelo where all this wind come from? was beautiful this morning oh yeah i was at work.....
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02-27-2010 09:28 PM  10 years ago
esmoglo

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Florida USA

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No idea on the weather its just plain nuts! As far as the O-Ring its bad there is no way around that. There should be slight resistance with any O-Ring seal. I have about a gallon and a half thru the motor now so its been in there/heated up. I can remember replacing fuel Nozzles on a ATR 72 there are tons of O-Rings and sometimes they work great and look great but often is such the case the do not work/seal properly that's what we have here I am sure. Funny thing is he ATR-72 O-Rings came from EU too!! LOL...

ATR-72

Angelo
Ugly can be fixed stupid is forever!
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02-28-2010 01:54 AM  10 years ago
Gernejr

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Wait now you not saying in 15 flight the o-rings are bad. I just rebuilt a nova 57 with 13 gals ( 130 flights)and the o-rings still look and feel like new...
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02-28-2010 02:15 AM  10 years ago
esmoglo

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Florida USA

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Its not inconceivable that there was a bad batch of rubber O-Rings, This particular O-Ring is always out of stock who knows. The nozzle over haul kits for the ATR-72 were thousands and thousands of dollars, more than I will spend in a life time with this hobby and there were often bad O-Rings.

Angelo
Ugly can be fixed stupid is forever!
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03-03-2010 07:39 AM  10 years ago
ININVERNO

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San Leandro - Ca - USA / Mandello del Lario - IT

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Hi Guy
I was out of my computer for some day, i got your query now.
In the Novarossi Heli engine the O ring for the Carburetor are 2.
-one is easy visible and is in the outside, placed in the carburetor bushing between carburetor and crankcase.
This O ring DON'T have any seal proposal, the proposal is as SPACER. Is normal that he come used very quick, because we advise to insert and push completely down the carburetor into the crank case. Engine can work perfectly also without it.

- second O ring, is installed into the crankcase hole were carburetor bushing go in, in the deep, near the crankshaft.
This is the Seal O ring.
In my memory I never change one of it, just clean some time.

In any case if you need get this O ring for service you can order p/n: 14002

TTYL
Any question welcome
Luca Invernizzi - ininverno@yahoo.com
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03-03-2010 11:18 PM  10 years ago
cudaboy_71

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sacramento, ca, u.s.

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[edit]

never mind. doh! moment.
if it ain't broke, break it.
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03-03-2010 11:30 PM  10 years ago
stuartmp74

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Gold Coast, Australia

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cudaboy_71, You could Post your questions about the N91 here

https://rc.runryder.com/t565327p1/

The shim is made from Aluminum have a closer look and you may find it.

I see you edited. I guess you found it
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03-31-2010 03:14 PM  10 years ago
HeliTool

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NV USA

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Yesterday I was ordering new bearings for my OS 55 at Boca Bearing. The guy was telling me that the Novarossi has a design flaw in the crank and its eating up the back bearing like crazy is this true and does anyone have any info on this?
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03-31-2010 04:55 PM  10 years ago
ININVERNO

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San Leandro - Ca - USA / Mandello del Lario - IT

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Please don't say thinks if you don't know really the situation
The Novarossi bearing are make inside the company Novarossi, have specific design for micro engines.
Cost maybe more, but stay longher compared the other best brand bearing.
Have better efficacy and the reason that are custom dimensions is to increase the general performance and the resistance of the engines.

The material, the tollerance, the shape the dimension are specific for glow micro rc engines, created after more of 25 years of experience in micro engine design and competition.
probably some people don't remenber that Novarossi was the best Heli engine 15 years agoo, than for some internal decision Novarossi stop invest in Heli engine and focus only in cars, after 10 world champion win (9 consecutevly) now Novarossi want say some about heli too... we just need time that user will understand, but our focus now is in Heli and we like be the number one.... than we work for that every days from 2 years and little by little we want show wath Novarossi know about engines.

who use Novarossi now is happy, wath desire more???
Luca Invernizzi - ininverno@yahoo.com
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03-31-2010 06:21 PM  10 years ago
Git

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Brunei

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helitool, im on my second set of piston and ring.. so far the bearing is still ok.. if it was my previous os50, i wud've prolly be on my third or fourth rear bearing by now..

luca, im not a engineer career wise but i did a few years of engineering.. why use non COTS (commercial off the shelf) items? arent there enough variety of bearing sizes that you can choose to design around the engine? from cheap low grades to space shuttle grades.. if metric sizes dont cut it, go imperial.. im only saying this due to your comment which kinda imply that i must only use nova bearings in my nova to get the best out of it.. a bit of a kerfuffle..

raptor was king of the heli market as well a few years back and the british ruled almost the entire world..

if nova wants to be the best.. i reckoned the rex 57 needs a 'better' carb.. cos my rex 57 with 61b carb rocks..

i will buy the best.. are there plans to go cline?

just my 2c
Alees Rush 750
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03-31-2010 06:32 PM  10 years ago
ININVERNO

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San Leandro - Ca - USA / Mandello del Lario - IT

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dear thanks for the info.
Novarossi need grow in this new and nice world... take time from zero to be everywere, be patient... smaller step with respect and knoledge, this make the thinks durable...

about the carb.... be patient, we know the situation and we work hard
... VERY HARD.....is a promize....
don't make me any question I cannot say... but just be patient.
Luca Invernizzi - ininverno@yahoo.com
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03-31-2010 10:07 PM  10 years ago
stuartmp74

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Gold Coast, Australia

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Yesterday I was ordering new bearings for my OS 55 at Boca Bearing. The guy was telling me that the Novarossi has a design flaw in the crank and its eating up the back bearing like crazy is this true and does anyone have any info on this?
Hmmm, If this is the advise that these guy's are giving you I would seriously consider buying my bearings from somewhere else as they obviously have no Idea what they are on about.

I have one of the first N57 Engines sold and I have been flying pretty much 2 days a week every week since, putting through 4-5 tanks a day.

There is no sign of any failure modes developing in this bearing.

IMO this bearing will not fail unless insufficient oil is used, contaminates get into your engine or you run the engine super lean for extended periods even then you are more likely to do some piston or sleeve damage before the bearing goes.

Boca Bearing
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04-01-2010 03:59 PM  10 years ago
HeliTool

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NV USA

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OK cool thanks for the update guys. That sucks when someone is trying to sell there product and and tells you there is a design flaw so you can buy there expensive Bearing....
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04-01-2010 09:48 PM  10 years ago
stuartmp74

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Gold Coast, Australia

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The best thing you can do to help 'Boca Bearing' is to tell everyone you know what they are up to.

This will affect there sales and eventually, hopefully there attitude.

Honestly is the best policy
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04-05-2010 12:36 PM  10 years ago
Git

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Brunei

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engine gurgling at full collective
ok.. i just switched to 25% nitro (cosmo oil high lube).. it was tuned and running awesome at 30% (coolpower) but stock ran out..

so now, i just spent half a gallon and cant get it to run even close to how it was previously.. havent changed anything else.. 0.4 shim, os8 plug..

it makes this gurgling sound at fff or full climb using full collective.. what's the cause? it goes away when i richen the high needle but so does the power.. i leaned it more, gurgling stays but again lost of power..

any suggestion?.. sum1 here mentioned pre ignition.. shud i use colder or hotter plug?
Alees Rush 750
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