RE: SK ENGINES

RE: SK ENGINES
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RE: SK ENGINES - 4/13/2007 10:47:12 PM

mtwister

Posts: 687
Joined: 11/3/2005
From: Salem , OR, USA
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Wouldn't that equate out to 25% oil? Wouldn't 1 cup oil to 5 cups methanol be 20%?

quote:

ORIGINAL: Turk1

quote:

ORIGINAL: z

Hi Z,I am blending my own fuel without nitro.Get a cup and an empty container.Fill the cup full of castor(or synthetic oil you prefer) pour it into container.Then fill the same cup with methanol for 4 times into container.Now you have 1 unit oil to 4 unit methanol,meaning 20% oil.If you would like add some nitro then half of the cup means 10% .So you should put 3,5 cup of methanol and a half cup nitro into container to have 20% oil,10 % nitro.

(in reply to Turk1)

Post #: 251

RE: SK ENGINES - 4/14/2007 12:24:42 AM

OUTCAST

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Joined: 1/5/2002
From: ., NJ, USA
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I think Turk is correct.
Look at the total volume, 4 cups of meth plus one cup of oil is five cups or a total of 40 0z of fuel {assuming each cup is 8 oz}.
of that 40oz 8 is oil making it 20%
Is that right Turk?

(in reply to mtwister)

Post #: 252

RE: SK ENGINES - 4/14/2007 5:15:26 AM

Turk1

Posts: 635
Joined: 10/8/2004
From: Istanbul, TURKEY
Status: online

quote:

ORIGINAL: OUTCAST

I think Turk is correct.
Look at the total volume, 4 cups of meth plus one cup of oil is five cups or a total of 40 0z of fuel {assuming each cup is 8 oz}.
of that 40oz 8 is oil making it 20%
Is that right Turk?

Hi Outcast,yes,ours is right.1/ total 5 =20% by volume.

< Message edited by Turk1 -- 4/14/2007 5:20:40 AM >

(in reply to OUTCAST)

Post #: 253

RE: SK ENGINES - 4/14/2007 5:27:34 AM

GMoneyPit

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Joined: 5/30/2005
From: Albuquerque, NM, USA
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mtwister,

The volume of oil is 25% of the volume of methanol (1:4 ratio), but is 20% of the total volume as pointed out by the others (1 part out of the total 5 parts). Just trying to make things more clear.

Gary

(in reply to mtwister)

Post #: 254

RE: SK ENGINES - 4/14/2007 6:51:30 PM

z

Posts: 174
Joined: 10/11/2004
From: tulsa, OK, USA
Status: offline

Turk, do SK's need this much oil content it seems to be that the fuel will be awful thick?

(in reply to z)

Post #: 255

RE: SK ENGINES - 4/14/2007 7:23:57 PM

Turk1

Posts: 635
Joined: 10/8/2004
From: Istanbul, TURKEY
Status: online

Hi Adam, you are right but Im not an expert ,I have read a lot of debate here about percentage of oil but It seems min.15% max 20% is right for modern ABC(ringed) engines.

(in reply to z)

Post #: 256

RE: SK ENGINES - 4/14/2007 8:07:19 PM

z

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From: tulsa, OK, USA
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Thats about what I figured, im no expert either but since most of my flight time is torque rolling on the runway the fuel needs to draw pretty easily. I wonder if 15% synthetic would be thinner?

(in reply to Turk1)

Post #: 257

RE: SK ENGINES - 4/15/2007 7:25:36 AM

Turk1

Posts: 635
Joined: 10/8/2004
From: Istanbul, TURKEY
Status: online

Hi Adam,yes you are right,I felt it too that full castor and cold weather makes it pretty hard to feed fuel on my SK 50 on midranges so I have to keep it so rich on LSN.I think full synthetic will make it easy to feed.I would keep it 20% for a good time to have a healthy break in period.After some time you can reduce the oil percentage on your will.Dont forget,SK has chromium liner.

(in reply to z)

Post #: 258

RE: SK ENGINES - 4/17/2007 12:16:29 AM

Arceenut

Posts: 94
Joined: 11/14/2005
From: Aldergrove, BC, CANADA
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Seems like a similar problem I found with another engine (GMS). The symptoms are - if the low speed needle is leaned to the proper setting for a good idle, The high speed needle cannot be richened enough. The cure - remove the high speed needle and cut off or grind approx 3/32 off the sharp end and reshape the very end to a 45 degree angle. You will find then the high speed needle can now be richened as needed. I have found this problem with other rotating barrel type of carbs that move in and out to meter the low end.

Any feedback would be appreciated.

quote:

ORIGINAL: Turk1

Hi,I noticed a slight problem on some SK 50 engines on mine and a friends.Weather gets colder everyday here so I am thinking more dense full castor fuel is the main reason.My problem,if I try some leaner idling to have better idling,then on a certain midrange(about half)
engine gets leaner and cant compansate any more trottle if push stick fast and stops.So I have to keep a good rich my low speed needle.High speed needle seems uneffective on this.I think heavier fuel cant pass on those tiny passages fast enough to compansate.I will reduce castor percentage in my fuel for those winter days.

(in reply to Turk1)

Post #: 259

RE: SK ENGINES - 4/17/2007 12:19:11 AM

z

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From: tulsa, OK, USA
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I dont believe this to be the case in SK engines it is the home made fuel being used that is quite a bit thicker than commercial blends.

(in reply to Arceenut)

Post #: 260

RE: SK ENGINES - 4/17/2007 12:44:48 AM

Arceenut

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From: Aldergrove, BC, CANADA
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See my post re reshaping the high speed needle

quote:

ORIGINAL: OUTCAST

Dammud, I had the same problem with my 90 and contacted Kangke before I wasted it. According to Ray the problem is not the instructions it's a bad batch of low speed needles. He said they were made by an outside supplier and weren't ground correctly. The problem is the factory doesn't know how many or what engines are affected because they all use the same low needle. Most of the engines seem to be fine, my 70 was perfect, but the 90 would not get rich enough to prevent it from overheating on the test stand. I set it at 5 turns out and all the problems went away.

(in reply to OUTCAST)

Post #: 261

RE: SK ENGINES - 4/17/2007 11:33:27 AM

OUTCAST

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Joined: 1/5/2002
From: ., NJ, USA
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Problem is in the low speed needle not the high.
The taper is too long and doesn't clear the fuel delivery tube at WOT.

(in reply to Arceenut)

Post #: 262

RE: SK ENGINES - 4/23/2007 3:01:06 PM

Turk1

Posts: 635
Joined: 10/8/2004
From: Istanbul, TURKEY
Status: online

WARNING
Today a buddy has received his brandnew SK 90 engine and I was near him.After unpack the carb,it was obvious that, low speed needle will not allow 4 stroking richening for breaking in if not open several tours.(One cant see the gap between needle and spraybar).So any future SK owner should be careful for such a situation which Dammud unfortunately hit.

(in reply to OUTCAST)

Post #: 263

RE: SK ENGINES - 4/23/2007 3:29:12 PM

dammud

Posts: 39
Joined: 4/4/2007
From: , TX, USA
Status: offline

Kangke kindly replaced the engine that I burned up with a brand new one.
Everything but the muffler is brand new. I was in a hurry to get the
Laser 200 in the air and so I bought a YS140 for it.

< Message edited by blw -- 4/23/2007 4:33:43 PM >

(in reply to Turk1)

Post #: 264

RE: SK ENGINES - 5/30/2007 6:31:25 PM

Team_Monkey

Posts: 63
Joined: 11/15/2005
From: Northeast, OH, USA
Status: offline

Hello gents.
I was fortunate to get a few flights on my .50 this past weekend. Now that I have the 12x5 prop she runs really nice and smooth. Pulls well too for an engine with only 4 or 5 tanks of fuel through it. It's also much quieter than my .46 and .47 engines. I'm sure that's due to the RPM and muffler differences, just mentioning it.

Questions:
The carb barrel is really hard to rotate when it gets close to 'closed', I had trouble slowing down. If I slowly move the throttle down, it sticks. if I run WOT then down, the servo can get the carb down to idle setting.
---I've read about someone (Ed maybe?) have burrs on the carb barrel and making i