RunRyder RC
 3  Topic Subscribe
WATCH
 1 page 625 views
HelicopterEngines Plugs Mufflers Fuel › OS91SX-Hring C Spec Pump - need advices on weather rapid change!
05-04-2005 11:13 AM  12 years agoPost 1
umbro

rrNovice

HoChiMinh City - Vietnam

My Posts: All  Forum  Topic

Hi all.

I'm visiting New Zealand ( weather temp 18-20'C) now but soon will go back to my country where the weather is now at 42 degrees Celcius....lol....

I was just wondering:
What are the possibilities of the engine can be if weather changes rapidly like that?

How do I fine tune the engine to match this kind of weather?

( I need to fine tume myself as well....gosh...40 degrees temp!!!) lucky, it's only a short time.

Thanks heaps in advance!

Cheers!
Phil

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-04-2005 01:12 PM  12 years agoPost 2
RotorHead486

rrKey Veteran

England

My Posts: All  Forum  Topic

Hey,

Just speaking for my own personal experiance, we are finding here in the UK that it's getting warmer every year and with the temperatures varying i find that i have to richen in the summer and then lean back again during the winter.

Running on 15% CP i found i had to richen/lean about 4 clicks depending on the conditions.

I'm now running 30% Magnum and i'm finding the settings are not as critical as it was with the 15%.

Richening is always the safest route! maybe try 4-6 clicks richer and see how it goes, the temperature test on the backplate is always a good indicator of the enigne overheating.

The richer setting allows more fuel through hence more cooling.

It may also be necessary to experiment with plug temperatures, i used to go down a plug rating from say a 'Hot' plug to a 'Hot/Warm' plug during the really hot seasons, but i was also using low nitro hence the engines where running a little leaner.

Also fuel may be a contributing factor, can you get hold of the same fuel you are using now?

If you are going to be using a different fuel then reset your needles to the factory setting and start from scratch with the new fuel, allow time for it to work though the engine and then put a couple of tanks though it to get it settled on the new fuel and then retune the needles for it and the climate you are in.

If in doubt, reset the needles if using the same fuel and retune.

Hope this helps!
Cheers!
Rotorhead486

One Reason For Crashing'Rogue Servo Bent on World Domination'!!
FLP Flight Team

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-04-2005 01:38 PM  12 years agoPost 3
umbro

rrNovice

HoChiMinh City - Vietnam

My Posts: All  Forum  Topic

Hi Rotorhead,

your suggestions and advices above are more than helpful. It's excellent!

It's true that it's getting warmer ( in England), and hotttttttttttttttter ( in Vietnam) , and in New Zealand now hasn't got much rain as it usually is. (What's happening with EARTH??)
Also fuel may be a contributing factor, can you get hold of the same fuel you are using now?
unfortunately, I can't. I will have to use diferent fuel than the one I'm using.

anyone else if you have any tips or tricks on how to fine tune your engine? how to know if it's rich or lean....etc...please continue to help me and other newbies. It would be very much appreciated!!!!

Cheers!
Phi

PS: Is the OS 91 Pump be able to run on fuel without nitro?. This is the fuel mixing formula that I'm using now : 1 litre of Oil/ 5 litres of Methanols

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-04-2005 01:44 PM  12 years agoPost 4
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

My Posts: All  Forum  Topic

Tuning depends on the type of engine/carb and other factors, but one thing remains constant - only the main needle affects tuning at full power. Hence the "best" way to tune is to dial in the main needle at full power first, then tweak the idle and mid if present to achieve a good mid and idle mixture.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-04-2005 02:55 PM  12 years agoPost 5
RotorHead486

rrKey Veteran

England

My Posts: All  Forum  Topic

Hiya Phil,

Dr Lodge is correct, and as the PS had only the main needle and the idle needle it should be less hassle to sort out.

Best thing to do is to reset the main needle and mybe the idle needle if you have altered it at all but if you ain't then just leave it and just adjust the main needle (2 Turns from closed). Stick some of the fuel you have available in and run a couple through it to flush the fuel lines through and also the pump etc.....etc..... just basic hovering and the likes and then retune with the new fuel, during your tuning check the temperature of the enigne by putting a wetted finger on the backplate of the engine, if it's warm and you can keep your finger there that's generally a good indication that the engine is running OK, if it's blistering hot and it burns your finger then it's way too lean or it's overheating.

Generally i've found OS engines to run on anything, i used to run 0% nitro when i first started as i was on a budget but once i moved onto 10% i found my engine ran much smoother, during last year i went onto 15% and then 20% Coolpower and then to my current fuel which is 30% Magnum. I found the 20% Coolpower and 30% Magnum to run much cooler and the enignes just generally get warm while still producing the power.

Are you going to mix your own or are you going to buy a pre-blended fuel? Do you know what the available blends are there?

What i do to tune my engines is to set them to factory setting and run plenty of fuel through them in the hover, generally about a gallon to 2 gallons (Don't take long with a 90 ) and then start to lean it a couple of clicks at a time. Generally i have the machine in the circuit by the second gallon and just have it in steady circuits, once the engines starts to smooth out and produce more power i normally just adjust one click at a time. Normally you can hear the enigne stop hunting or what i call burping or farting as it's still on the rich side.

What i would say is that try and get a high quality fuel with a decent oil content, swapping fuels on engines is no good for them (Well i don't think it is ) I would assume you will be able to get hold of Coolpower, i like the 20% Heli Blend of Coolpower (Pinky/Orange Colour) it has 20% oil and my enignes seem to run good on it, nice n smooth with plenty of power. If you don't want to go onto 20% Nitro then i think the 12% Heli Coolpower is also 20% Oil. Don't know what sort of fuel you will be able to get hold of but if you can get hold or either Coolpower/Magnum/Wildcat/Powermaster you won't go far wrong, we also have a fule here in the UK from ModelTechnics called Bekra which is formulated for Heli's and is a good fuel.

Hope this helps!
Cheers!
Rotorhead486

One Reason For Crashing'Rogue Servo Bent on World Domination'!!
FLP Flight Team

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-05-2005 01:32 AM  12 years agoPost 6
umbro

rrNovice

HoChiMinh City - Vietnam

My Posts: All  Forum  Topic

Hi guys,

Phil here. awesome posts. I don't think I can ask any further questions cause you guys all covered them all.
Are you going to mix your own or are you going to buy a pre-blended fuel? Do you know what the available blends are there?
Yep, I'm going to mix my own. I think I use Castor Oil and Methanol.
1 litre of oil is mixed with 5 litres of Methanol. That's it. I don't know any further mixing formular.

I will ask my instructor for other mixing formular with nitro. it shouldn't be a problem!

just wondering if Nitro will make the engine won't last as long as when running without Nitro? (engine life is shorten)

It's sad to say that there is no other fuel available in my country apart from the fuel I mix. We don't have Coolpower or Magum etc. unfortunately.

BUT the good thing is Methanol, Nitro and Castor Oil in my country are pretty good price, $2 USD/litre of fuel or can be less.

Thanks heaps Rotorhead and Dr Lodge

Phil

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 1 page 625 views
HelicopterEngines Plugs Mufflers Fuel › OS91SX-Hring C Spec Pump - need advices on weather rapid change!
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Wednesday, January 17 - 1:28 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online