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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › NOT YOUR NORMAL OS ENGINE BREAK IN QUESTION !
08-04-2007 09:34 AM  13 years ago
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DRUMMER

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Dover, UK

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NOT YOUR NORMAL OS ENGINE BREAK IN QUESTION !
Okay guys, today the shiny new 91H X is installed and ready for the first start up tomorrow. I have searched & read myself blind about
the break in procedure and am happy to make a start.

However, this engine replaces a os 91 cspec that constantly spat out plugs and loosedned head bolts causing a few forced autos, hence the change.[there was no obvious head/tail vibration]

The questions is: Should I disable my CSM govenor 20 during the breaking process or okay to leave it 'online' during the run in period??

Any help including advice to sell up, get out of the hobby and buy a frisbee gratefully accepted
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08-04-2007 10:47 AM  13 years ago
menace

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Sydney, Australia

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i have read lots about turning off the governor during the 'break-in' process due to thegov will mask the bad spots of tuning the motor.!boo!
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08-04-2007 11:34 AM  13 years ago
Jafa

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Sydney, Australia

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What is a 91H-X??? Webra or Rossi?

Definately run her in in normal mode, governor disabled
Don't hold constant loads, vary it
Get the engine through 4 or 5 heat up/down cycles
The will work better after each flight

Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX
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08-04-2007 12:01 PM  13 years ago
BarracudaHockey

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Jacksonville FL

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Its an OS, just like the thread title says

Yes, a rich engine will drive a revlock batty, it will hunt and surge.

Just hit the set button when while the sensor light is flashing and that will bypass the governor.
Andy
AMA 77227
http://www.jaxrc.com
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08-04-2007 04:07 PM  13 years ago
DRUMMER

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Dover, UK

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gentlemen, I salute your knowledge and timely replies. The govenor shall be set to off during the breakin period, safe in the knowledge that I shall no doubt find other ways to screw the engine up in due course!

drummer
remember if your face fits..wear it.
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08-04-2007 04:13 PM  13 years ago
nivlek

rrProfessor

Norfolk England

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The worst possible thing with the gov enabled is that , if the engine is too lean , the gov will open the throttle to maintain engine speed - one toasted engine .At the end of the day , it gets dark .
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09-09-2007 04:16 PM  13 years ago
DRUMMER

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Dover, UK

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confused drummer..sob sob..
hellooo again,
well the break in process has gone well and got recently to the point of being confident in the engine running smoothly enough to allow some roll and loops. During one loop the fuel sloshed around and briefly left the fuel clunk dry, so I fitted a header tank before flying again.

Now I have a problem with consistancy when running the engine and over one flight the header tank ends up with about 10% air at the top of it, even with plenty of fuel in the main tank. Also the engine sometimes just coughs & dies in when spooling up and also once in flight

Is this indicative of a air leak somewhere and /or the low needle setting wrong? Or is the positioning of the header tank height critical?

any help appreciated
drummer
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09-09-2007 06:35 PM  13 years ago
nivlek

rrProfessor

Norfolk England

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If at all possible , I have the header tank at the same height as the carb and as close to the carb as possible .
Does the engine have a pump ? If not , I have found that "uniflowing" the tank helps with certain helis/engines for consistant tunning .
I have not found that the header tank empties to any "great" extent before the main tank is empty , but , after all , you are using the header tank as a bubble trap , so having it slightly less than full at the end of a flight isn't necessarily a problem .
At the end of the day , it gets dark .
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09-09-2007 10:36 PM  13 years ago
DRUMMER

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Dover, UK

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hi,
thanks for your input: No, the engine is not pumped just pressurised by the exhaust manifold to the main tank and then to the header.
Is this what you mean by 'uniflow'? The header is situated on a Rap90 in the one obvious place where the side frames and screws dictate.

I have blown through all the fuel components and all seems airtight and sealed. I am not very good with engines and screwed up the previous os90 by over leaning the engine to early, hence my slowly breaking in this engine.

any thoughts appreciated..including suggestions to sell helis and buy a rc boat!

regards
drummer
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09-10-2007 03:00 AM  13 years ago
Chris.C

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Hong Kong

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During one loop the fuel sloshed around and briefly left the fuel clunk dry, so I fitted a header tank before flying again.

Now I have a problem with consistancy when running the engine and over one flight the header tank ends up with about 10% air at the top of it,
I think this is due to one problem. The clunk line in your main tank is not right, either the length or the line itself.
the engine sometimes just coughs & dies in when spooling up and also once in flight
Assuming your header tank positioned correctly as said above, it is the needles not correct meaning the idle screw, or the middle is on the rich side.

Cheers,
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09-10-2007 04:45 PM  13 years ago
Captain Crazy

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Wakefield, England

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Get the engine running right before engaging the governor.
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09-10-2007 04:54 PM  13 years ago
DS 8717

rrProfessor

Here wishing i was somewhere else

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I set the needles so the engine is slightly rich in normal mode with no governor on, then switch to idle 1 with a headspeed that will let the engine turn in the 15000 rpm range and fly it around without loading the head. I feel it's better to keep a constant rpm when breaking it in, and a slighty rich setting.YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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09-10-2007 05:34 PM  13 years ago
nivlek

rrProfessor

Norfolk England

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Uniflowing is explained here :

http://www.fraserker.com/heli/unifl...iflow_works.htm
At the end of the day , it gets dark .
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09-10-2007 08:21 PM  13 years ago
Chopper

rrKey Veteran

Stow,Oh- oops, I mean St Louis, nope Stow again,

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Your problem is simply (as stated by Chris): The line/klunk in your main tank is not right.

Get this right before doing ANYTHING else. THEN you can work on the other issues.

What heli/tank???
Paul Soha is a free agent now. Wow.
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09-12-2007 10:23 AM  13 years ago
DRUMMER

rrApprentice

Dover, UK

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hi guys,

thanks for all your inputs:

It is a Rap 90 with a standard tank and a quick uk header.

Before i installed the header I said that I had a problem with the fuel just missing the main clunk in a stall turn, I think this was just a mistake by me letting the fuel get to low, hence fitting the header. But I will check out the clunk again before trying next.

I did try and fly with the govenor disabled but both times then engine stopped during spool up. I am told this transition is goverened by the top needle and if so does this sound like to rich and flooding the engine with to much fuel or too lean and it is getting to hot? [this whilst spooing up]

am working the problem through but slowly as i don't want to screw up another engine and /or the whole machine !

any comments appreciated
drummer
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09-12-2007 02:54 PM  13 years ago
Chopper

rrKey Veteran

Stow,Oh- oops, I mean St Louis, nope Stow again,

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With the OS, the top end needle affects the WHOLE range; top, mid, and low. The top end needs to be reasonably close to get good transition in the midrange. Too rich, and it will quit, like you said.

10% air in the header with a nearly empty tank is not too bad, not perfect, but not too bad. Your tank line could be too stiff, or the wrong length.

The OS engines can be frustrating...even if you are a good engine man. I am not sure of the 91h X engine though. I am not familiar with that carb. What carb is it, and does it use a pump?
Paul Soha is a free agent now. Wow.
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09-12-2007 03:14 PM  13 years ago
BarracudaHockey

rrMaster

Jacksonville FL

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Replace the clunk line, the stuff that comes with the kits is crap.

Uniflow = swatting flys with a 12 gauge (fun but not practical or needed)
Andy
AMA 77227
http://www.jaxrc.com
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09-14-2007 12:19 PM  13 years ago
DRUMMER

rrApprentice

Dover, UK

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okay guys, since you were kind enough to help me out here is some feedback:

I replaced the clunk line and fuel filter and blew through the whole fuel system. I leaned the idel needle half a turn and i ran it up with the governor off. The result was dramatic and the engine is running very nicely again. I re engaged the govenor and it did what it was supposed without any drama.

so thanks for all your help on this one

cheers
drummer

ps if you are ever down this way let me buy you a beer [with 10% of course!]
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