RE: GMS Engine Tuning Problem

RE: GMS Engine Tuning Problem
View related threads: (in this forum | in all forums)

Logged in as Guest

Users viewing this topic: none

Printable Version

All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> RE: GMS Engine Tuning Problem

Page: << < prev 15 16 17 18 19 [20] 21 22 23 24 next > >>

Login

Message

<< Older Topic Newer Topic >>

RE: GMS Engine Tuning Problem - 8/16/2007 2:04:13 AM

alcarafa

Posts: 257
Joined: 12/11/2006
From: miami, FL, USA
Status: offline

ANY OF YOU GUYS KNOW WHAT IS THE FACTORY LOW SPEED NEEDLE SETTING OF THE GMS 47? I REMOVED IT TO CLEAN THE ENGINE FROM RESIDUES BEFORE OPERATING IT, BUT LOST THE NOTES I MADE ABOUT HOW MANY TURNS IT WAS SET.

THANKS FOR YOUR HELP.
RAFA

< Message edited by alcarafa -- 8/16/2007 2:05:28 AM >

(in reply to RUNDUCK)

Post #: 476

RE: GMS Engine Tuning Problem - 8/16/2007 3:41:57 PM

Blade47

Posts: 1056
Joined: 6/4/2003
From: Whitehorse, YT, CANADA
Status: offline

Fully open the throttle barrel look inside and turn the needle in until you can just fit a cover of a match package between the needle and the bar you will be very close.

cheers

_____________________________

Pete
Revver Brother #93

(in reply to alcarafa)

Post #: 477

RE: GMS Engine Tuning Problem - 8/23/2007 6:45:48 PM

alcarafa

Posts: 257
Joined: 12/11/2006
From: miami, FL, USA
Status: offline

quote:

ORIGINAL: Blade47

Fully open the throttle barrel look inside and turn the needle in until you can just fit a cover of a match package between the needle and the bar you will be very close.

cheers

Peter thanks for your help.

Rafa

(in reply to Blade47)

Post #: 478

RE: GMS Engine Tuning Problem - 8/27/2007 6:21:48 PM

alcarafa

Posts: 257
Joined: 12/11/2006
From: miami, FL, USA
Status: offline

Hi guys:

As I said I bought a brand new GMS47, I've put it apart to clean engine before break in, have read the entire thread about some engine problems, started break in with a 9/7 MA and omega 10% fuel, after two tanks flew my plane, engine performance was ok till it suddenly died fly after fly, there was obvious overheat cause it's a brand new engine.

Started thinking about drilling and all that stuff you mention, but surprise come out when I runed out of fuel ( omega 10% ) bought another brand cause it was only one in store ( cool power 10 % ) have to tell you, I played a bit with low speed needle and results where amazing, engine works outstanding with no need of drilling any part of it and screams like hell.

May be GMS has worked out the problem on carb or I was just lucky with mine, there is one thingh for sure all I did was to set idle neddle at 1 3/4 turns, thats where it ended up I like these engines no matter what other pilots say.

Regards.
Rafa

(in reply to alcarafa)

Post #: 479

RE: GMS Engine Tuning Problem - 8/27/2007 7:01:54 PM

DarZeelon

Posts: 6928
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline

quote:

ORIGINAL: alcarafa

...Started thinking about drilling and all that stuff you mention... Bought another brand cause it was only one in store (CoolPower 10% ) ...

Rafa,

What 'drilling' are you talking about!?

I don't think a new engine needs any part 'drilled' to make it run properly...

Also, CoolPower (better known here as CruelPower

) is not the right fuel for this engine!
It needs fuel with a good measure of castor oil and the CP has none at all.

The manufacturer tells you so specifically that 'Omega' is the right fuel for ABC/ABN engines.

It is more than likely that either; 1. your engine 'matured' to just beyond break-in during that last flight, or 2. the previous gallon of Omega was old/stale/absorbed moisture and this is what gave you those troubles.

I hope you did the break-in as described here.

_____________________________

Dar Zeelon - ISRAEL - ddzeelon@gmail.com
MVVS - Jett - Nelson - Bolly - Mejzlik

(in reply to alcarafa)

Post #: 480

RE: GMS Engine Tuning Problem - 8/27/2007 7:24:02 PM

Flyboy Dave

Posts: 13306
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: offline

...some of the early GMS carbs (like mine) were miss-drilled for the inlet of fuel aprox.
40% restriction. This lead to a leaning out in flight, and deadstick. Most of them would
not respond to the main needle....you could open them up 7-8 turns and nothing would
happen due to the restriction. In other words, you could not get them richened up enough
flight. The problem was, they would run OK on the ground with the richness just enough to
deceive the operator into believing the engine was running OK. Then after a minute in the air
the inevitable leaning out, overheating, and dead stick.

Also the muffler nipple was restricted. This caused a loos of fuek pressure that exasperated
the problem. I went through my engine with a fine tooth comb before I ran it, because of
the problems others were having, and I isolated these two problems.

Enlarge this pic and see the restriction. Mine runs like a top. No doubt it would have run
poorly with these obvious problems.

FBD.

Attachments

Click to see fullsize image.

Click for fullsize

_____________________________

An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
"Old Age, and Treachery will overcome youth and skill".
Revver Bro #4.

(in reply to DarZeelon)

Post #: 481

RE: GMS Engine Tuning Problem - 8/27/2007 9:10:09 PM

DarZeelon

Posts: 6928
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline

Thank you for the insight, Dave.

It is hard to believe such defective merchandise could reach the market in large numbers...

_____________________________

Dar Zeelon - ISRAEL - ddzeelon@gmail.com
MVVS - Jett - Nelson - Bolly - Mejzlik

(in reply to Flyboy Dave)

Post #: 482

RE: GMS Engine Tuning Problem - 8/28/2007 2:13:12 AM

blw

Posts: 4454
Joined: 3/15/2004
From: Auburn, AL, USA
Status: offline

Dar,

It happens with full sized engines too. There are cases of Allison turbines having defective compressor blades, and rebuild plants making mistakes during rebuild. We have heard of QC problems with model engines often enough too.

_____________________________

The ultimate responsibility of pilots is to fulfill the dreams of the countless millions who can only stare skyward...and wish.

(in reply to DarZeelon)

Post #: 483

RE: GMS Engine Tuning Problem - 8/28/2007 5:49:20 AM

DarZeelon

Posts: 6928
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline

quote:

ORIGINAL: blw

It happens with full sized engines too. There are cases of Allison turbines having defective compressor blades, and rebuild plants making mistakes during rebuild. We have heard of QC problems with model engines often enough too.

Barry,

Maybe this is one reason Rolls-Royce (UK) now owns Allison Turbines... To get all the bugs out...

_____________________________

Dar Zeelon - ISRAEL - ddzeelon@gmail.com
MVVS - Jett - Nelson - Bolly - Mejzlik

(in reply to blw)

Post #: 484

RE: GMS Engine Tuning Problem - 8/28/2007 2:20:54 PM

speedster 1919

Posts: 1466
Joined: 12/17/2004
From: Martinsville, IN, USA
Status: offline

I have several friends that work at Rolls-Royce ,AKA Allison Turbines............

_____________________________

Hey Buddy -That was the most spectacular crash I've ever seen , That rolling cart wheel with parts slinging out was cool...

(in reply to DarZeelon)

Post #: 485

RE: GMS Engine Tuning Problem - 8/28/2007 4:54:54 PM

blw

Posts: 4454
Joined: 3/15/2004
From: Auburn, AL, USA
Status: offline

The Allison problem was back in the 1970's, I think. It was an installation problem with a worker who introduced contamination. Very tough to track down. The rebuild issues were in S. Korea at an Army facility and not related to Allison. Sorry to hear they were bought out. I didn't know that.

I mentioned that to put our glow engine design and QC issues in perspective. A breakdown in the assembly process happens with almost all brands at one time or another.

_____________________________

The ultimate responsibility of pilots is to fulfill the dreams of the countless millions who can only stare skyward...and wish.

(in reply to speedster 1919)

Post #: 486

RE: GMS Engine Tuning Problem - 8/28/2007 5:05:41 PM

w8ye

Posts: 17021
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: offline

Rolls Royce is a publically held English company. It has a 15% cap on any particular ownership but no aggregate limit on foreign investment as a whole.

They have many interests in the USA besides Allison. They also bought out Cooper Bessemer near where I live.

In reality, it is no different than any other public company in this country and no reason to think that quality control will be any better than it was before?

Everyday for months they have ads in the paper wanting the pretty much same specific skills. They must not pay much / or they are too cheap to culture these people themselves?

< Message edited by w8ye -- 8/28/2007 5:18:15 PM >

_____________________________

Attended the CutFinger Institute of DirtNap University for years but never did graduate....

Club Saito Member #7
Original AMA #31261

(in reply to blw)

Post #: 487

RE: GMS Engine Tuning Problem - 8/28/2007 7:04:25 PM

alcarafa

Posts: 257
Joined: 12/11/2006
From: miami, FL, USA
Status: offline

Dar: I did followed break in as they mention in their manual, if you havent read the entire thread, some pilots have had tuning problems with this engine, solution was to drill nipple on carb and muffler, spray bar and muffle hole just one size larger, but main problem was missalignment of carb nipple and spray bar holes.

Dont think CP will harm any engine if you add some castor oil to it, at least this engine is working like hell and that is what it was intented to do or what I wanted.

Regards.
Rafa

(in reply to DarZeelon)

Post #: 488

RE: GMS Engine Tuning Problem - 8/28/2007 7:52:55 PM

DarZeelon

Posts: 6928
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline

quote:

ORIGINAL: alcarafa

I don't think CP will harm any engine if you add some castor oil to it, at least this engine is working like hell and that is what it was intended to do, or what I wanted.

Rafa,

CP is already 17% all synthetic oil.

If you add 3% castor oil to it, you would have roughly 20% oil.

The Omega, as it comes, is 4.9% castor oil and 12.1% synthetic (break up 17% 30/70).

Why bother buying additional castor oil to add to CP, if you can have the castor oil pre-mixed in Omega?

Seeing the engine perform in the short-run has no bearing on the end result...
Both Morgan and OS say you should use castor oil in the fuel for ABC engines...

But hey, it's your engine and you can do whatever you want with it.

_____________________________

Dar Zeelon - ISRAEL - ddzeelon@gmail.com
MVVS - Jett - Nelson - Bolly - Mejzlik

(in reply to alcarafa)

Post #: 489

RE: GMS Engine Tuning Problem - 8/28/2007 10:08:18 PM

alcarafa

Posts: 257
Joined: 12/11/2006
From: miami, FL, USA
Status: offline

But hey, it's your engine and you can do whatever you want with it.

[/quote]

Your right my friend.

Let me tell you I've used CP since long time with OS and GMS engines with no harm to them , only difference you have is that castor will burn at higher temps than sinthetics but remember tech in sinthetics has improved much also.

There are opinions about the use of fuels like clouds in the sky, whats important is performance and seems, like my GMS likes CP better.

< Message edited by alcarafa -- 8/28/2007 11:36:00 PM >

(in reply to DarZeelon)