RE: SK ENGINES

RE: SK ENGINES
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RE: SK ENGINES - 9/1/2006 11:27:19 AM

Turk1

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

Hi Ed,when do you think will be able to try your SK babies too?To hear comments and experiments from an experienced guy like you will be useful for me.

(in reply to Ed Cregger)

Post #: 26

RE: SK ENGINES - 9/1/2006 2:27:11 PM

ckangaroo70

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

quote:

ORIGINAL: Artisan

quote:

ORIGINAL: ckangaroo70

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

The only thing greater than watching a new Plane take flight, is the feeling you got knowing that you built it yourself. Support your Kit Cutters and Manufacturers!

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

Responding to your signature line:

Ermmm, if I was going to get all warm and fuzzy about building it myself, I would have to cut out the parts too. <G>

A guy could get a blister on his hand doing that!LOL I really admire those who cut there own kits by hand, and build from scratch. I prefer to build from a box of wood where alot of the parts, or at least the wing ribs have allready been done. Alot of good kits have dissapeared over the last few years, and I really enjoy building a good kit, so hence my signature. It may be that someday my only option will be to build from scratch if the market for kits keeps going the way it is going.

_____________________________

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(in reply to Ed Cregger)

Post #: 27

RE: SK ENGINES - 9/1/2006 3:44:45 PM

bubbap51

Posts: 129
Joined: 3/19/2006
From: temple, GA, USA
Status: offline

I got my SK 50 on Wednesday and broke it in on the test stand yesterday. I followed the instructions to a "T". Talk about pinch. This is a tight engine, much tighter than my 46ax was out of the box. Well it idles down nice and transitions without a hiccup. I have thrown it in my old nexstar ( the 46ax went into my midwest aerobat ) and will be going to the field this afternoon to give it a shakedown, unless it rains. I will let you all know how she does. I think we have a great $60.00 motor to play with.

(in reply to ckangaroo70)

Post #: 28

RE: SK ENGINES - 9/2/2006 3:40:43 AM

bubbap51

Posts: 129
Joined: 3/19/2006
From: temple, GA, USA
Status: offline

Well the SK 50 ran like a champ. It would idle for at least a minute and not hesitate on transition. Everyone at the field was quite interested in the new motor. We spent a lot of time on the bench just checking everything out and tweaking the carb. What was interesting is we set it to be a bit rich with a tach, and then held the plane nose high, and it leaned out real quick. We added 3 more clicks and that did the trick. 6 tanks thru the engine now and I am quite happy. No deadsticks, a smooth idle at about 2600 RPM. Hope to go lower as it breaks in. I think it has as much or more power than the 46AX - at 1/2 the cost. The plane seems faster but the mind can play tricks on you when you want all things to go well!!!! I wish I had 2 identical planes to compare the SK 50 VS the 46AX. Bottom line.... best $60.00 bucks I have spent in a while!

(in reply to bubbap51)

Post #: 29

RE: SK ENGINES - 9/2/2006 3:56:57 AM

ckangaroo70

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

Glad to hear the SK 50 did well for you. My SK 90 is running so flawless, I decided to order another SK 90 just to have on hand. I can't believe they will stay at those prices for long, so I figured I had better snag another one up on the cheap!

_____________________________

Visit Mikes Ultra Sport info page! http://www.tesla-2.dyndns.org/~mhammer/us60

(in reply to bubbap51)

Post #: 30

RE: SK ENGINES - 9/2/2006 4:48:46 AM

Oldbob

Posts: 156
Joined: 6/29/2005
From: georgetown, TX, USA
Status: offline

Well I received my SK 50 yesterday and today it was bolted to the test stand and ran twice. I followed their break-in procedure and during the first run the carburetor was sticking when I tried to close or open it and after the second run the carb. barrel would not turn at all. Need to call Kangke tomorrow.

Will keep you posted.

(in reply to ckangaroo70)

Post #: 31

RE: SK ENGINES - 9/2/2006 6:28:20 AM

Ed Cregger

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

quote:

ORIGINAL: Oldbob

Well I received my SK 50 yesterday and today it was bolted to the test stand and ran twice. I followed their break-in procedure and during the first run the carburetor was sticking when I tried to close or open it and after the second run the carb. barrel would not turn at all. Need to call Kangke tomorrow.

Will keep you posted.

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

I have had engines of all brands do exactly what you are describing.

The problem is a piece of flashing that has jammed the carb barrel at the slot where the travel limit screw protrudes into the throttle barrel.

Remove this screw and you'll be able to slide the throttle barrel out with a little effort. Check the throttle barrel for flashing near the screw slot. Most likely, the flashing will be in the carb body. A few gentle swipes with some emory cloth or 400 wet or dry will rid you of the problem. I've had Enya engines with this problem. If it can happen to an Enya, it can happen to any engine. No biggie. <G>

_____________________________

Artisan

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

(in reply to Oldbob)

Post #: 32

RE: SK ENGINES - 9/2/2006 6:29:57 AM

Ed Cregger

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

quote:

ORIGINAL: Turk1

Hi Ed,when do you think will be able to try your SK babies too?To hear comments and experiments from an experienced guy like you will be useful for me.

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

It won't be long now. The temps are finally beginning to drop to something that I can handle. Perhaps in a couple of weeks.

_____________________________

Artisan

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

(in reply to Turk1)

Post #: 33

RE: SK ENGINES - 9/2/2006 9:16:51 AM

Turk1

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

OldBob I have heard same problem from another SK owner and heard also after sales service of Kangke was great from him.But like Artisan, I recommend you to play a little with carb and after checking, excersize it by manually to prevent it from future sticks.Im so happy with my SK 50 s and I think you will too.
Also I wonder who will be the first to try a Tower muffler on a SK to compare the potancial power of SK s.

< Message edited by Turk1 -- 9/2/2006 9:26:16 AM >

(in reply to Ed Cregger)

Post #: 34

RE: SK ENGINES - 9/4/2006 2:45:57 AM

ckangaroo70

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

My 1st SK 90 is running excellent, but had some trouble today with the SK 90 I just recieved a few days ago. After the third tank today it was transitioning great, and even had a nice idle running on the rich side. Decided it was running well enough to take it up in my Hog Bipe which I was using for the test Plane. The Hog normally has a Mag 4 stroke mounted on the nose, but it makes a good test vehicle since the engine is easy to access, and the Plane is a great flyer. 30 seconds after take off a clunk noise occurred and she locked up solid. After a rough deadstick landing I inspected the engine, and found that the crankshaft had broke where the piston rod connects. I am hoping that this engine just had a weak spot in the crank, and is not a sign of what might happen to the other SK 90 I have which is running fantastic so far. My buddy checked the head temp with his laser temp gauge and she read a cool 130-140 degrees, which is not surprising since she was still running on the slobery rich side. Actually it was running along just wonderful up until the time the crank broke. No sign that it was comming or anything. So I got home and sent an email off to Kangke. I've heard there customer service is pretty good, so hopefully they will honor the warranty and either fix it or replace it. I just recieved the engine a couple days ago, so now it seems I am going to have to send it right back off. Well crap happens sometimes, and hopefully this is an uncommon occurence. I have been thrilled with my SK engines right up to the point of that crank breaking, and if it proves to be an uncommon occurence I am sure I will continue to be impressed in the future.

_____________________________

Visit Mikes Ultra Sport info page! http://www.tesla-2.dyndns.org/~mhammer/us60

(in reply to Turk1)

Post #: 35

RE: SK ENGINES - 9/4/2006 3:11:25 AM

Oldbob

Posts: 156
Joined: 6/29/2005
From: georgetown, TX, USA
Status: offline

Artisan & Turk, thanks for the input. I took the carb apart and found that the venturi hole in the barrel had a sharp edge sticking outward and cut a deep grove into the carb housing. I used a small file and removed the sharp edges. Now the barrel turns easy but I wonder if I am sucking air into the engine that is not going through the venturi?? The engine runs at 12,500 peak and steady at about 12,000+ with an APC 11X6. Does this sound about right?

oldbob

(in reply to ckangaroo70)

Post #: 36

RE: SK ENGINES - 9/4/2006 4:43:44 AM

Ed Cregger

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

quote:

ORIGINAL: ckangaroo70

My 1st SK 90 is running excellent, but had some trouble today with the SK 90 I just recieved a few days ago. After the third tank today it was transitioning great, and even had a nice idle running on the rich side. Decided it was running well enough to take it up in my Hog Bipe which I was using for the test Plane. The Hog normally has a Mag 4 stroke mounted on the nose, but it makes a good test vehicle since the engine is easy to access, and the Plane is a great flyer. 30 seconds after take off a clunk noise occurred and she locked up solid. After a rough deadstick landing I inspected the engine, and found that the crankshaft had broke where the piston rod connects. I am hoping that this engine just had a weak spot in the crank, and is not a sign of what might happen to the other SK 90 I have which is running fantastic so far. My buddy checked the head temp with his laser temp gauge and she read a cool 130-140 degrees, which is not surprising since she was still running on the slobery rich side. Actually it was running along just wonderful up until the time the crank broke. No sign that it was comming or anything. So I got home and sent an email off to Kangke. I've heard there customer service is pretty good, so hopefully they will honor the warranty and either fix it or replace it. I just recieved the engine a couple days ago, so now it seems I am going to have to send it right back off. Well crap happens sometimes, and hopefully this is an uncommon occurence. I have been thrilled with my SK engines right up to the point of that crank breaking, and if it proves to be an uncommon occurence I am sure I will continue to be impressed in the future.

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

If the .90 that broke the crankpin is ABC, you just found out why you NEVER run an ABC engine slobbery rich. This is precisely why you do not do it that way these days. ABC engines are supposed to be ran in a slightly rich two-stroke. If the engine is four-stroking, it does not come up to temperature and the pinch at the top stays tight. When this happens just a bit of running in this fashion can shear the crankpin. Sorry this happened to you.

_____________________________

Artisan

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

(in reply to ckangaroo70)

Post #: 37

RE: SK ENGINES - 9/4/2006 4:47:36 AM

Ed Cregger

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

quote:

ORIGINAL: Oldbob

Artisan & Turk, thanks for the input. I took the carb apart and found that the venturi hole in the barrel had a sharp edge sticking outward and cut a deep grove into the carb housing. I used a small file and removed the sharp edges. Now the barrel turns easy but I wonder if I am sucking air into the engine that is not going through the venturi?? The engine runs at 12,500 peak and steady at about 12,000+ with an APC 11X6. Does this sound about right?

oldbob

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

The peak rpm sounds about right. This is a new engine that will probably gain close to another 500 rpm over time, putting it right where the winners in this class are running at. I think you are home free with this one.

Oil from the fuel will fill in around the carb barrel fit and will plug it up sufficiently. Besides, all you really should care about is how the engine is running and leave the fitting worries to the manufacturer. Your engine sounds as though it is running perfectly from your description.

_____________________________

Artisan

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

(in reply to Oldbob)

Post #: 38

RE: SK ENGINES - 9/4/2006 5:59:26 AM