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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Novarossi 91 and Rex combo
03-08-2010 12:45 PM  8 years agoPost 1
helinewby

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Orlando Florida

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I have the Novarossi 91 in it and a Rex pipe On my odin! Let me tell you she rocks like no other. So if your a HZ or SR kind of guy. Look in the clasified section because they are coming up for sale shortly

thanks C.B.

Team TSA Models, Team YS, Team Spin Blades..

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03-09-2010 03:19 PM  8 years agoPost 2
helinewby

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Orlando Florida

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Question?
Even though the power is there and it pulls like a frieght train, The sound is not what i exspected from the combo because it only has 1 and half gallons is it not on the power band yet?

what head speed are you guys running with on the 90's with the novarossi combo?

thanks C.B.

Team TSA Models, Team YS, Team Spin Blades..

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03-10-2010 03:06 AM  8 years agoPost 3
Gernejr

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Miami, Fl

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one of my friends has that setup at 2000HS in TREX 700 his is ported and has OS carb and cline mod. IT has CRAZY power....

Sponsored by Visa

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03-10-2010 09:49 PM  8 years agoPost 4
popiterflyer

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Va

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I have that combo in my srimok and it seems pretty wicked. I just finished the break in and it has serious power and it is still at factory settings!

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03-17-2010 03:53 AM  8 years agoPost 5
cudaboy_71

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sacramento, ca, u.s.

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what do you guys think is going on when factory settings won't even start the heli?

i tried for 2 hours straight (and 2 new glow plugs) to get the factory settings to do ANYTHING. all it would do is fire for 5 seconds, then die. i'd have to dry out the plug, blow the cylinder and repeat the process. i finally got it to spool up to about 1/3 throttle by firing it up on the pad, and spooling up immediately. but, it just died when it got to the midrange. no loading up or bogging...just like it turned off.

this is all brand new stuff on a new heli. so, the fuel line is all new; tank is new; pipe is new. i've looked everywhere for air leaks; re-seated the carb; out of ideas there.

but, the only way i could break in the motor was to lean out the low end to 3/4 turn out (factory setting is 1.5 turns out). richen up the midrange and high end by nearly 1.5 turns over factory (factory mid is 1.5-2 turns and high is 2.5-3 turns).

well, ok the heli is flying decently as i've run through 5 tanks like this nice and rich. head temp was still 195°F (but, everyone says the novas want to run hot).

i'm just curious why everyone else i know seems to be able to run these things at factory settings and i cant. i'm worried that i'm missing something and setting myself up for a failure.

any ideas?

if it ain't broke, break it.

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03-17-2010 10:24 AM  8 years agoPost 6
gorn

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Western Australia

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Mine would not work at factory settings when new.
I had to lean my idle needle quite a bit.
I just kept leaning it until it would idle reliably.
On the high I think Im at about 2 1/4 and ,mid is at about 2.

The high is a tad rich at the moment, but the mid feels very good.
Could maybe go leaner, but hey, its working for me lol.

I had problems with the transition from idle to mid needle too.
But after I had run about 4 gallons through it, issue basically went away.
No change in fuel or anything else.
Only thing I can come up with, is that these motors run tight for longer than other brands.

Im very happy with mine now.
Starts 1st hit every time, idles very well, transitions to mid very well.
Peak power is better than my OS HZ.

Yes the Nova's like to run a decent temp, but I would not say hot.
Factory says 100-120deg C.
If your only running 90deg, it still performs well, but upping the temps make a very big difference.
At 90deg I would say it went like my HZ.
At anything over 100 it hosed it lol.

For the love of the hobby

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03-17-2010 04:06 PM  8 years agoPost 7
cudaboy_71

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sacramento, ca, u.s.

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Only thing I can come up with, is that these motors run tight for longer than other brands.
that's what i was hoping/thinking, too. i had a similar experience with an old OS .91 FX. just ran like crap new, but worked itself out fine after a few gallons.

i just wanted to make sure i wasnt hurting this motor.

thanks.

if it ain't broke, break it.

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03-17-2010 04:14 PM  8 years agoPost 8
gorn

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Western Australia

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no problem

For the love of the hobby

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03-17-2010 06:44 PM  8 years agoPost 9
Gernejr

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Miami, Fl

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JMO. Novarossi use a Dykes piston ring that uses compression to push/seat ring to liner.Also we all break in your motor running rich to long requiring more breakin time because it 7 to 10 tanks before we start leaning out.You can start tune a Nova in by the 4 tank. Understand at 210 degree its running on rich side.

Sponsored by Visa

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03-18-2010 10:01 AM  8 years agoPost 10
stuartmp74

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Gold Coast, Australia

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I found that I had to lean the low speed needle to start with during the run-in period to about 1 turn. As you said it just would not start at 1.5 turn.

I put this down to the main and mid needle being so rich.

My engine is run-in now and producing good power.
I am running 30% Nitro & 0.4mm shim pack.

My current needle settings are.
Low = Just over 3/4 of a Turn
Mid = Just over 2 & 3/8 of a Turn.
High = 1 & 5/8 of a Turn.

With my current setting I am getting a backing plate Temp of around 48 Degrees Celsius and a head Temp of 104 to 107 Degrees Celsius.

I resonantly pulled then engine down to check it for signs of over temp or pre-ignition. All was good, Very clean. The head was a nice golden color which is what you want.

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03-18-2010 10:22 AM  8 years agoPost 11
ININVERNO

rrApprentice

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

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Hi guy
sorry for the situation we already define it in Novarossi.
some bad understanding between me and the assy deparment make the std setting to ritch.
Now the new carb will exit from factory withis setting:
min: open 1
med open 2.5 (to be sure will be rich)
max open 2.5 (to be sure will be rich)

For sure you need lean, but this is not our job....
ahahahah

About bkeack in, the new novarossi waas completly redesigned compared long time ago, now breack in id 5 tanks max, than lean push and after 10 first fly change the plug, from then you will be happy fo rlong long time, i promize.

TTYL

Luca Invernizzi - ininverno@yahoo.com

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03-18-2010 03:35 PM  8 years agoPost 12
cudaboy_71

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sacramento, ca, u.s.

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thanks luca,

motor is broken in fine now, and in the process of leaning out (2-3 more tanks).

i was just concerned with everyone saying "factory settings are working great" when it was not the case for me. just making sure i wasnt doing something wrong, or overlooking something.

FWIW, the ACTUAL factory settings were very different from the manual. if i'd have left the needles alone instead of setting them per the manual i'd have probably been better off.

maybe consider putting a small note or sticker in with the new motors stating the actual breakin settings differ from the printed manual???

if it ain't broke, break it.

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03-18-2010 06:03 PM  8 years agoPost 13
ININVERNO

rrApprentice

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

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Hi I understand your position, but the situation is very simple.
You buy engine that was prosuced some week ago, than form now , after my back from vegas I discovery this situation than the frendly comunication of you guy, MANY THANKS.
Now i already trasmittet the new parameter.
We also will update the manual, than don't worry guy , just re check your engine from the box setting and do per instruction, will be ritch fo rsure, buit will run... than you will defien the setting.

I also need you now to receive feedback about your normal setting for fine tuning.
I please you all to send me PM or here int he thread your 3 needles setting, will be really appreciate.

Thanks.

Luca Invernizzi - ininverno@yahoo.com

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03-18-2010 06:55 PM  8 years agoPost 14
Gernejr

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Miami, Fl

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Why is Novarossi thinking about steppin up to a 3 needle carb like OS and YS?

Sorry i was thinking about the 57 2 needle.

Sponsored by Visa

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03-18-2010 06:55 PM  8 years agoPost 15
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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luca: PM sent.

@ gernejr: yes, nova .91 has 3 needles.

if it ain't broke, break it.

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03-18-2010 09:10 PM  8 years agoPost 16
ININVERNO

rrApprentice

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

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PM received thanks

about other question I cannot say too much, but Novarossi is Novarossi and when we do we do seriusly.....

Luca Invernizzi - ininverno@yahoo.com

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03-26-2010 07:19 AM  8 years agoPost 17
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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what kinda 3D headspeeds are you guys finding for the 91?

doing the max torque calculation for my 700 says i should set the gov at 16500/8.2= 2012

but, there's other guys running 2200 on 700s and it *seems* like it has a lot of power (maybe just more noise?). i know i'll have to play with it to find the H.S. i like. just wondering what you all are finding.

thanks.

if it ain't broke, break it.

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03-26-2010 08:04 AM  8 years agoPost 18
gorn

rrElite Veteran

Western Australia

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Im running 2050rpm.
Im going to try 2100, but that will be my limit I think.
I cant afford to pop a motor right now lol

For the love of the hobby

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03-26-2010 10:14 AM  8 years agoPost 19
ININVERNO

rrApprentice

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

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tareq told us that in the 700 with 690 blade he fly 2100
REX 91 have the max power torque at 16500 is right, but we advise to add 50 / 100 head rpm to compensate the eventually load reduction effect.

the 91 have high power elasticity, then when he loose a little rpm he will recover super faster.

Any question are welcome.

Luca Invernizzi - ininverno@yahoo.com

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03-26-2010 12:39 PM  8 years agoPost 20
gorn

rrElite Veteran

Western Australia

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Thanks Luca
I will be taking it up to 2100rpm next time out

For the love of the hobby

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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Novarossi 91 and Rex combo
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