RE: SK ENGINES

RE: SK ENGINES
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RE: SK ENGINES - 10/31/2007 7:40:57 PM

Turk1

Posts: 645
Joined: 10/8/2004
From: Istanbul, TURKEY
Status: offline

Hi TeamMonkey,your symptom seemed some overtighten low speed needle adjustment to me.Recommend you to open LSN a little more.My both SK 50 s are having little more than 2 full turns for flight using no nitro full castor fuel with A3 plug.

(in reply to Team_Monkey)

Post #: 476

RE: SK ENGINES - 10/31/2007 11:16:28 PM

BantamTJ

Posts: 54
Joined: 10/9/2005
From: Brookline Station, MO, USA
Status: offline

quote:

ORIGINAL: spad4mebaby

Bantam TJ you may need to call and talk to a human.
I remembered this post by Ray Nano a while back.

UPDATE!!!
I contacted the fella @ Kangke, he had my engine & paperwork right in front of him as we were talking, & although being shorthanded on help, he informs me it should be ready, & on it's way back to me by the 1st of the week. Maybe I'll be able to get this new bird in the air soon.

< Message edited by BantamTJ -- 10/31/2007 11:40:37 PM >

(in reply to spad4mebaby)

Post #: 477

RE: SK ENGINES - 10/31/2007 11:28:54 PM

spad4mebaby

Posts: 65
Joined: 8/14/2007
From: Bull Head, AZ, USA
Status: offline

BANTAM TJ Noooooooooooooooooooo!!!
Theatrical isnt it Noooooooooooooooooooooooooooooooo????

Question ???? What is the name of fella @ Kangke,

he had my engine & paperwork right in front of him as we were talking, & although being shorthanded on help, he informs me it should ready & on it's way back to me by the 1st of the week. Maybe I'll be able to get this new bird in the air soon.

Ray Nano may be working some where else by now?

Please post the name of the support person!

< Message edited by spad4mebaby -- 10/31/2007 11:32:30 PM >

(in reply to BantamTJ)

Post #: 478

RE: SK ENGINES - 10/31/2007 11:48:31 PM

BantamTJ

Posts: 54
Joined: 10/9/2005
From: Brookline Station, MO, USA
Status: offline

Ray's last day was today

. I don't know if the person I spoke with was actually the product support person for sure, but his name is Bill, seems like a real nice guy!!! Wondered if I was in a hurry for it, (I suppose to expedite things a bit), which I told him I was not in any great rush. He seems to be a real "people person" & wants to go above & beyond to help out customer's & to also uphold Kankge's commitment to customer satisfaction.

(in reply to spad4mebaby)

Post #: 479

RE: SK ENGINES - 11/1/2007 12:01:20 AM

spad4mebaby

Posts: 65
Joined: 8/14/2007
From: Bull Head, AZ, USA
Status: offline

Bantam TJ I hope you are flying soon.
Break it in then go flying.
Good luck!

Good luck to you Ray Nano.
Enjoy!

< Message edited by spad4mebaby -- 11/1/2007 12:03:21 AM >

(in reply to BantamTJ)

Post #: 480

RE: SK ENGINES - 11/1/2007 1:17:00 AM

BantamTJ

Posts: 54
Joined: 10/9/2005
From: Brookline Station, MO, USA
Status: offline

Thanks!

(in reply to spad4mebaby)

Post #: 481

RE: SK ENGINES - 11/1/2007 4:35:21 AM

kbear

Posts: 295
Joined: 9/11/2004
From: Denton, TX, USA
Status: offline

quote:

ORIGINAL: Team_Monkey

I agree with Fiery, I don't care if you love it or hate it but let's get back to talking engines instead of attitudes. If you think someone is wrong it's OK to disagree but do we have to disgrace ourselves with personal attacks?
The bobcat thread just lost about 20 pages due to someone cleaning up the garbage. Who knows if anything good was lost.

I flew my SK 50 (w/ MAS 12x5) again Monday but she was just a bit 'off'. The temp was down about 20 degrees F from the last time I flew so I expected a little needle adjustment but I couldn't get it to "peak" using the pinch test. I'm not sure how many turns out I was, but if I went any more 'out' fuel started coming past the HS needle threads. So I set it as best I could and went for a few flights. The plane it's on flies at 1/3 throttle so I wasn't worried about over heating. I'll have to figure out that needle though. Another guy on spadworld runs a 50 and he has his set 4 1/2 turns out for a MAS 12x5.

Hey Monkey. I was checking it today, and I was in error. It was actually Close to 7 turns out. I took a look at the gap inside between the LSN and the spray bar and it is slightly wider than my other 50 which is running fine at 2 1/2 turns out on the HSN. Also I'm running APC 12x5s. I pulled the HSN out to inspect and compared it to the other one and it looks good. I put some fresh tubing on the intake to see if I could blow anything out that might be clogging it, and all was clean. I ran some thin copper wire through it and found nothing. The pressure nipple on the muffler is also clean. I'm going to take the intake nipple of the carb later to see if maybe there is a bur or something. It runs well at the current needle settings it just doesn't seem right to have the needle that far out. Are you running the same fuel as before? I had been running Cool Power 5% nitro all synthetic, but the only fuel I had on hand the other day was Wildcat 15% Synthetic caster mix. Wondering if that could be the problem. The other difference from the known good 50 if that the problem engine needs large adjustments to make changes in the rpms. At around 3 turns out, the apc 12x5 was over 12000 rpms. When I finally got it running well it was about 7 turns out and turning 11500 rpms. 4 turns should make a bigger difference than 500 rpms don't you guys think? Some of this may have already been covered, I'm still reading post since the last time I was on this thread. As for the LSN, to return it to the factory setting, I'm supposed to have the carb closed and then gently bottom the LSN and go from there correct?

(in reply to Team_Monkey)

Post #: 482

RE: SK ENGINES - 11/1/2007 7:02:39 AM

Turk1

Posts: 645
Joined: 10/8/2004
From: Istanbul, TURKEY
Status: offline

Hi Kbear,I would recommend you try to play with LSN and HSN simultaneously to see if LSN is limiting your richness.My SK 50 s all having that LSN -spray bar gap about 0,8 mm.(Though Im using full castor, meaning thicker fuel than you.)

(in reply to kbear)

Post #: 483

RE: SK ENGINES - 11/1/2007 1:54:27 PM

Team_Monkey

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

turk1 and Kbear
The only difference from the last time I ran it was the temperature. Mid eighties in September to mid sixties last Monday.
Fuel: 15% store fuel (forget brand)
Plug: O.S. A3 (or Tower, not sure)
Prop: 12x5 MAS

I did try to open the LSN slightly but the low-mid range was very rich. I flew one pattern but it was too rich even at 1/2 throttle. When I bumped the throttle to flair for landing it died. Luckily I was only a foot off the ground

. I leaned it out slightly and resored the low end but only had one short flight after that.
As a side note, my .46AX needed a couple clicks out on the same day.

< Message edited by Team_Monkey -- 11/1/2007 7:06:53 PM >

(in reply to Turk1)

Post #: 484

RE: SK ENGINES - 11/2/2007 12:17:54 AM

kbear

Posts: 295
Joined: 9/11/2004
From: Denton, TX, USA
Status: offline

Well, I have found the Culprit. My carb was attacked dust bunnies.

The pics say it all. She now turns an ASP 12X5 12300 with the LSN 2 1/8 turns out and the HSP 2 1/4 turns out.

< Message edited by kbear -- 11/2/2007 12:21:52 AM >

(in reply to Team_Monkey)

Post #: 485

RE: SK ENGINES - 11/7/2007 1:54:28 AM

Bigshark

Posts: 117
Joined: 12/1/2004
From: St. Louis, MO, USA
Status: offline

Is anyone flying the SK130? I'm toying with the idea of an SK130 in a Bridi Dirty Birdy 2+2, maybe with a large three or four blade prop (due to clearance issues) I know the SK's are torquers rather than rev'ers after reading this thread and I like the idea of some low end/get out of trouble grunt, for my first really acrobatic plane. Given the 130 is happy with as big as an 18 inch two blader, what would be a good three or four blader?

Thanks,
Rich

_____________________________

All attempts at artificial aviation are doomed to failure from an engineering standpoint.
1905 Editor Times of London

(in reply to kbear)

Post #: 486

RE: SK ENGINES - 11/19/2007 12:36:00 PM

kamikazejoe2

Posts: 28
Joined: 6/10/2007
From: INdia, INDIA
Status: offline

I got the sk130 and have it on the test bench. WIll update on the engine
KJ

(in reply to Bigshark)

Post #: 487

RE: SK ENGINES - 11/22/2007 12:31:28 AM

sladek49

Posts: 3
Joined: 11/15/2007
From: Willis, TX, USA
Status: offline

Just getting started so be gentle...

I just ordered an SK .50 for a trainer I am building...Since this is my first time to break in an engine I wanted to ask for some help...

I have read that the SK engines have low rpm, but have lots of torque...and to use a bigger prop, 12x5 on a .50...the website says 11x6 rpm at 2500-12000...and a prop range of 10 x 8-12 x 5

very confusion, when they, SK, tell you to run a 12x5 for best performance, but give 11x6 as a test range and a prop range of 10x8 to 12x5...

Questions:

If the SK 50 does not run well with smaller props like an 10x8, or even an 11x6, like many have stated in this thread, why do they recommend them?

Best break in procedures without "4 stroking"

Should I use an 11x6 to break in the motor, or a 12x5 or does it matter?

Best fuels to run the .50 on?

Adjust peek rpm and not max rpm...maxing it at break in can lean it and fry the engine...(I dont have a tach)

any other suggestion would be appreciated!

Thanks in advance

< Message edited by sladek49 -- 11/22/2007 12:42:17 AM >

(in reply to kamikazejoe2)

Post #: 488

RE: SK ENGINES - 11/22/2007 1:20:30 AM

Ed_Moorman

Posts: 3683
Joined: 1/5/2002
From: Shalimar, FL, USA
Status: offline

Last time I e-mailed to the SK tech, he said they needed to revise the instructions, but hadn't had time. Kangke USA is a pretty small outfit. I'm fairly sure the original instructions were translated from the Chinese or were old Tiger Shark engine instructions rewritten for the new SK engines. I was told that the US outfit wanted a higher torque engine and requested the resdesign from the Chinese manufacturer. After flying the engine, they found that it needed the larger prop.

Your best bet is to go with what a lot of us have found and stick with the 12-5. It runs just fine. Be sure you do follow the break-in instructions. I have 3 SK engines and all of them have run very well. I use a 12-5 on the 50 and a 15-6 on the 90s.

_____________________________

Ed Moorman, AMA 553, KD4QBM, Revver Bro #156
R/C Report Magazine, Fun Aerobatics Column

(in reply to sladek49)

Post #: 489

RE: SK ENGINES - 11/22/2007 8:13:43 AM

Turk1

Posts: 645
Joined: 10/8/2004
From: Istanbul, TURKEY
Status: offline

Sladek,I have 3 SK 50 s and some more of my friends.After about 2 years of use SK 50(I am one of the first explorers of SK line) my recommendations are slightly different than Kangke s tech dept.They adviced me to keep 11000-11500 RPM s on ground for my no nitro fuel.But I discover SK 50 likes more RPMs to give better power and not overheat.I recommend you to use 11-6 prop or 12-5.I found those props works better for my no nitro fuel.I have tried 11-7,11-8 props and engine didnt complain but in long term I found excessive carbonization on piston and head.

(in reply to Ed_Moorman)