SK ENGINES

SK ENGINES
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SK ENGINES - 7/30/2006 5:01:05 PM

ckangaroo70

Posts: 2068
Joined: 10/3/2003
From: London Mills, IL, USA
Status: offline

After scrolling through a million post, and trying to do a few searches, I am wondering if I am the only person who has ever ordered one of these? I am building my second super sportster 90/120 and decided to give one of these SK 90 engines a whirl. My other SS 90/120 was equipped with a Super Tiger G90 which I think is a pretty good engine for the money. The exaust is the only thing I don't like about the ST's. So when I come across this cheap 90 size SK engine, I decided "what the heck", I will give it a whirl! I am not what you would consider a penny pincher, and I do own several high priced, good quallity engines, but I am always open to giving something a try if the price is low($90). My SK engine is yet to be delivered, so my question is there anybody who else who has purchased one of these, and what was your experience with them? Thanks!
http://www.kangkeusa.com/

< Message edited by ckangaroo70 -- 7/30/2006 5:02:16 PM >

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Post #: 1

RE: SK ENGINES - 7/30/2006 6:21:51 PM

Turk1

Posts: 628
Joined: 10/8/2004
From: Istanbul, TURKEY
Status: offline

If you can make a search on this forum,you can find a lot threads on SK engines.I am maybe the first fan of those engines.I have 2 SK 50 and 1 SK 80 and Im very happy w my SK 50 s.(80 is still in box)I dont want to repeat myself one more time here( moderators will kick me out otherwise), you will be able to find a lot here after a quick search and also you can take a look at http://www.rcuniverse.com/product_guide/EngineRatings.cfm?engine_id=1012
You can find other SK s along there.
Strongly recommended.

(in reply to ckangaroo70)

Post #: 2

RE: SK ENGINES - 7/31/2006 4:28:15 AM

treedog

Posts: 506
Joined: 8/26/2004
From: Midway, AR, USA
Status: offline

And i thought i was the only sk90 owner and a 60 too both new in box just ain't got around to using them yet

Ok all u other cocka roaches come out of the dark corners he he

(in reply to Turk1)

Post #: 3

RE: SK ENGINES - 7/31/2006 2:50:18 PM

AMB

Posts: 3790
Joined: 6/10/2003
From: winter park, FL, USA
Status: offline

I have both an SK 56 amd 90 (both ringed) and converted to diesel with Aj Coholics head. The same chinese engine maker also-appeared as Blue arrow engines also after useing the improvementss paul ordered as they are good and i have had no problems except a bad bad carb which was replaced under warranty. they are I think a little better than GMS and Tower
a good value. I have the JEN 56s and 47 all suoer runners no problems if bought under the JEN, SK or Blue arrow labels name tag
you should have no issues martin

The first ones out a few years ago I thought was not the best quality I would not buy a used one from that times period

< Message edited by dieseldan -- 7/31/2006 2:58:59 PM >

(in reply to treedog)

Post #: 4

RE: SK ENGINES - 7/31/2006 11:27:44 PM

ckangaroo70

Posts: 2068
Joined: 10/3/2003
From: London Mills, IL, USA
Status: offline

Thanks for the info.

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(in reply to AMB)

Post #: 5

RE: SK ENGINES - 8/1/2006 4:46:26 AM

Ed Cregger

Posts: 7483
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline

I still have my NIB SK .50 ABC and .80 ringed. If it ever cools down, I hope to get them on the bench for break-in and then in the air.

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Artisan

"Flying models since the Fifties - I'll get the hang of this yet!!!"

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Post #: 6

RE: SK ENGINES - 8/3/2006 11:20:44 AM

TestPilot6

Posts: 81
Joined: 9/18/2005
From: San Francisco, CA, USA
Status: offline

I have an SK .90, too. Got it about a few weeks ago. I'm still building an airplane for the engine and will probably take another month before I'll finish it. Meanwhile, I've run the first 24 oz with 5% nitro PowerMaster and SuperTigre glow plug. Tech Support guy told me to make sure to run in rich 2 cycle, not 4 cycle like SuperTigre, to seat the ring correctly. I also used 15x6 APC prop by his recommendation, though the manual recommends 13x8. The first tank (24 oz) I ran at around 7000 to 7500 rpm. I enriched the mixture a few clicks in the early part since rpm started to rise as the engine was broken in. So far so good.

I started to lean the high speed mixture at full throttle but I had to stop and leave. I'll probably try setting the max and idle next week.

(in reply to Ed Cregger)

Post #: 7

RE: SK ENGINES - 8/3/2006 12:55:21 PM

speedster 1919

Posts: 1466
Joined: 12/17/2004
From: Martinsville, IN, USA
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I have a 50 and an 80. The 90 is suppose to be a bored out 80 . The 80 was very tight and did not like high nitro. Super Tigre OEM plugs are poor and and don't last that long. The SK is alittle hard to tune but they run good. They are not super power houses. That 15x6 is got to be too large a prop and 7500 too low for a 2 cycle. A 12x8 MAS will be the perfect speed prop .

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Post #: 8

RE: SK ENGINES - 8/4/2006 12:51:01 AM

Ed Cregger

Posts: 7483
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline

quote:

ORIGINAL: speedster 1919

I have a 50 and an 80. The 90 is suppose to be a bored out 80 . The 80 was very tight and did not like high nitro. Super Tigre OEM plugs are poor and and don't last that long. The SK is alittle hard to tune but they run good. They are not super power houses. That 15x6 is got to be too large a prop and 7500 too low for a 2 cycle. A 12x8 MAS will be the perfect speed prop .

----------------

Lately I have read of more ridiculous advice given by tech support people than I ever thought was possible. Who would recommend running a 15x6 on a .90 two-stroke during break-in, or any other time?

Ringed engines should be ran in a rich four-stroke during the first several tanks of fuel. ABC engines are ran in a rich two-stroke during break-in.

A 12x8 or a 13x6 would be about the perfect prop for breaking-in this engine. A 14x4 is okay too, once it has some time on it. You don't want to lug a glow two-stroke engine down much below 10,000 rpm at W.O.T. Gasoline engines are a different matter, their timing is adjusted for lower rpm. Adjusting a glow engine's timing is not such an easy matter and can lead to preignition/damage.

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"Flying models since the Fifties - I'll get the hang of this yet!!!"

(in reply to speedster 1919)

Post #: 9

RE: SK ENGINES - 8/5/2006 5:20:34 AM

TestPilot6

Posts: 81
Joined: 9/18/2005
From: San Francisco, CA, USA
Status: offline

Today, I tach'ed the SK .90. It idled great around 2200 - 2300 rpm. I got the following max.

APC 15x6 9400 rpm (1.75 hp)
MAS 13x8 10500 rpm (1.89 hp)
Zinger 13x6 11200 rpm (1.77 hp)

Parenthesis is the calculated horsepower by ThrustHP. 15x6 has the same loading as 14x8 and is within the range of props recommended to the engine by the mfr.

quote:

Lately I have read of more ridiculous advice given by tech support people than I ever thought was possible. Who would recommend running a 15x6 on a .90 two-stroke during break-in, or any other time?

Very interesting. The tech support complained ppl just don't read the instruction.

Now I'm not really taking either side. And I don't know who is right. But I'm not quite happy with the max rpm I got. The engine is rated at 2.5 hp as opposed to 1.8 hp I got. Does this mean it will get better, or got destroyed by the break-in? Hopefully the mfr rep has an answer.

(in reply to Ed Cregger)

Post #: 10

RE: SK ENGINES - 8/5/2006 2:10:33 PM

speedster 1919

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

Forget the MFT's stated max HP, most of the time it is hyped hog wash. 13x6 and 11,200 RPM is close too flyable and fast spool up RPM. 12,000 would be better and I don't care what your HP calculator says. Looks like after break-in your 15x6 RPM went up 2,000 RPM.

_____________________________

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 TestPilot6)

Post #: 11

RE: SK ENGINES - 8/5/2006 5:33:18 PM

ckangaroo70

Posts: 2068
Joined: 10/3/2003
From: London Mills, IL, USA
Status: offline

I think a 14X6 would probally be a good all purpose prop for this engine, but we'll see.

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(in reply to speedster 1919)

Post #: 12

RE: SK ENGINES - 8/6/2006 1:54:04 AM

TestPilot6

Posts: 81
Joined: 9/18/2005
From: San Francisco, CA, USA
Status: offline

quote:

Looks like after break-in your 15x6 RPM went up 2,000 RPM.

Speedster 1919,

No. 7000 rpm was the rich 2 cycle full throttle and not the max rpm. I was getting about 9000 rpm to begin with. That's why I'm a bit concerned. However, I can say the mid range and the idle definitely improved. The engine runs very smoothly from idle to the top, except at idle, it kind of 4 cycles, but didn't seem to die when a sudden full throttle was applied. I did various transitions many times and they all sounded great.

I have 2 ST GS-40s and both of them give more than 1.2 HP, although the rated HP is 1.15 HP. I did use 10% OMEGA but that's not high nitro content. So that's where my expectation comes from.

Ken

(in reply to ckangaroo70)

Post #: 13

RE: SK ENGINES - 8/6/2006 11:38:08 AM

Turk1

Posts: 628
Joined: 10/8/2004
From: Istanbul, TURKEY
Status: offline

My SK 50 is on a heavy trainer Excel 2000(about 6 lbs.).Starts at first flip,idles great as long as you want.Transition is good.(I keep it a little rich for safety).At full throttle it pulls my heavy trainer -almost- unlimited vertical.(I couldnt test it so long to prove because I afraid to loose).Im using industrial methanol(means a lot water), full castor and 11x6 prop.Im soo happy with my cheap but flawless engine.Most of all very reliable,never had a deadstick during its about 6 hours flight t