RE: OS FL 70's, junk or otherwise????    Gallery
View related threads: (in this forum | in all forums)

Logged in as Guest



Users viewing this topic: none
    Search This Thread  
 
Printable Version


Moki 2.10
Seller:  thunderbolt-RCU
Details:   $250.00   |  5/18/2013   |  Classified Ad
We will rotate YOUR AD in this spot if you select "Forum Featured" when placing or editing your ad!

All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> RE: OS FL 70's, junk or otherwise????
Page: <<   < prev  1 2 3 [4] 5   next >   >>  

Tower Hobbies Get Coupon Codes Brands  
Login
Message << Older Topic   Newer Topic >>
RE: OS FL 70's, junk or otherwise???? - 3/10/2010 7:05 PM   
blw



Posts: 7635
Score: 655
Joined: 3/15/2004
Last Login: 5/23/2013
From: Opelika, AL, USA
Status: online
quote:

ORIGINAL: jaka

When it comes to glow plugs the manufacturers makes it very simple for us modelers as there are only one plug to use in most four strokes and that is the OS F plug.


The Saito SS plug is also a good one, and is a bit better priced.

quote:

Make sure you change glow plug after the initial 6 flights or so, as the plug's filament gets contaminated from the metal particles resultant of the initial run-in wear. I have 4 plugs that I use exclusively for running-in on the bench.


Good advice. I keep several that are marked as break-in plugs. The new plugs that come with engines are removed until I think the initial break in is finished. Then, I put those back in for flying and the break-in plug goes back in the tool box.

Also, that was good advice about seals. No need to worry over them.

_____________________________

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

"It doesn''t take but one Auburn man to be a majority" -
Coach Pat Dye

Hide Signatures

(in reply to jaka)
       Post #: 76

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 7:20 PM   
gchdavid


 

Posts: 176
Score: 100
Joined: 2/13/2007
Last Login: 12/10/2012
From: Plymouth, MN, USA
Status: offline 		So I shouldn't remove the bearing seals? How does the timing system get lubrication then?

Just want to make sure so I don't hurt it by not doing anything when i had the chance.

Thanks.

Chris

Hide Signatures

(in reply to blw)
       Post #: 77

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 7:30 PM   
w8ye



Posts: 36438
Score: 318
Joined: 12/11/2001
Last Login: 5/24/2013
From: Shelby, OH, USA
Status: offline 		The rear bearing does not have seals. It has only shields.

The part # is 6001Z which is merely a shielded bearing. Oil will flow through it.

http://pics.towerhobbies.com/imagel/o/losmg3107.jpg


_____________________________

Attended the CutFinger Institute of DirtNap University for years but never did graduate....
Recipient, Mangledhand award August 2008
Club Saito Member #7
Original AMA #31261

Hide Signatures

(in reply to Iflyglow)
       Post #: 78

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 7:39 PM   
gchdavid


 

Posts: 176
Score: 100
Joined: 2/13/2007
Last Login: 12/10/2012
From: Plymouth, MN, USA
Status: offline 		Shouldn't I be able to blow air through from the rear of the crankcase if I remove the rocker cover or are the pushrod tubes sealed to the pushrods? I ask because last night I was not able to get any air to flow if I blew through the rear of the crankcase with the rocker cover removed (without the rear cover of course). If oil is going to flow through so should air, right?

Thanks.

Chris

Hide Signatures

(in reply to w8ye)
       Post #: 79

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 7:44 PM   
w8ye



Posts: 36438
Score: 318
Joined: 12/11/2001
Last Login: 5/24/2013
From: Shelby, OH, USA
Status: offline 		To truely measure the crankcase ventilation would require a leak down test.

That is to apply a pressure to the rear of the crank case and watch the pressure slowly beed down through the valve cover area.

Oil on the lifters will likely prevent your observance of air passing them. But oil under pressure while the lifeters are moving up and down will pass the lifters.

_____________________________

Attended the CutFinger Institute of DirtNap University for years but never did graduate....
Recipient, Mangledhand award August 2008
Club Saito Member #7
Original AMA #31261

Hide Signatures

(in reply to gchdavid)
       Post #: 80

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 7:55 PM   
gchdavid


 

Posts: 176
Score: 100
Joined: 2/13/2007
Last Login: 12/10/2012
From: Plymouth, MN, USA
Status: offline 		Ok then. I will not touch it. Less work for me.

What I will do is open that valve cover after every day of flying and lube it with oil just in case.

I will do the same with the camshaft area...

After reading lots, being that this engine has minimal "blow by" due to the ring less piston design, it seems as though the main source of lubrication for the crankcase area is the line that goes to the muffler. Why are people saying this line should be disconnected because it will cause early failure?

Chris

Hide Signatures

(in reply to w8ye)
       Post #: 81

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 8:19 PM   
Patxipt


 

Posts: 711
Score: 105
Joined: 10/13/2006
Last Login: 5/23/2013
From: Amadora, PORTUGAL
Status: offline
quote:

Why are people saying this line should be disconnected because it will cause early failure?


Ignorance, plain and simple. Folks that say that don't know how the lubrication system works for the FL-70.

_____________________________

Club Saito member #632
Once you hear the sound of a multicylinder 4-stroke, you''ll be hooked forever!

Hide Signatures

(in reply to gchdavid)
       Post #: 82

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 8:59 PM   
gchdavid


 

Posts: 176
Score: 100
Joined: 2/13/2007
Last Login: 12/10/2012
From: Plymouth, MN, USA
Status: offline 		Ok, so I will just make sure and lube everything in between sessions just in case and hook everything up like it should be.

What fuel should I use? Castor makes a mess but its probably a good idea....however, synthetic lubricants have improved greatly in past years and they don't make a mess.

Any input on this? I am planning on going to the LHS today to pick some fuel up so I can get that engine up and running again. I plan on going with 10-15% but I would like suggestions on:

- Brand/Name
- Lube type (castor, syn or mix)
- Lube %

I'm excited about getting this going again...its been a while.

Chris

Hide Signatures

(in reply to Patxipt)
       Post #: 83

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 9:16 PM   
Patxipt


 

Posts: 711
Score: 105
Joined: 10/13/2006
Last Login: 5/23/2013
From: Amadora, PORTUGAL
Status: offline 		During initial run-in on my FL-70, I used a 50/50 oil mix of castor oil and Graupner Pro-synth. I prefer full castor for running-in, all parts get lapped more rapidily with great lubrication, though I skipped it with pro-synth as I didn't have enough oil at home for full castor mix. Modern synthetic oils are too slippery, in fact, Graupner don't recomend pro-synth for running-in engines!

_____________________________

Club Saito member #632
Once you hear the sound of a multicylinder 4-stroke, you''ll be hooked forever!

Hide Signatures

(in reply to gchdavid)
       Post #: 84

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 9:31 PM   
gchdavid


 

Posts: 176
Score: 100
Joined: 2/13/2007
Last Login: 12/10/2012
From: Plymouth, MN, USA
Status: offline 		The engine has already been broken in. Its been sitting for 2 years so I want to go through the steps again to get it running nice.

What fuel for flying?

Chris

Hide Signatures

(in reply to Patxipt)
       Post #: 85

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 10:17 PM   
Iflyglow



Posts: 3777
Score: 122
Joined: 10/26/2002
Last Login: 5/19/2013
From: Clintonville, WI, USA
Status: offline
quote:

ORIGINAL: Patxipt



Well, it did not last very long in the OS line up.


It lasted six years! Some of the car and heli engines are out for only two years or so.






It was an over priced engine, that had far to many cost cutting measures done to it.

< Message edited by blw -- 3/11/2010 2:31 AM >

Hide Signatures

(in reply to Patxipt)
       Post #: 86

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 10:44 PM   
Patxipt


 

Posts: 711
Score: 105
Joined: 10/13/2006
Last Login: 5/23/2013
From: Amadora, PORTUGAL
Status: offline

Mine cost a little over the regular price for a OS FS-30, new.

< Message edited by blw -- 3/11/2010 2:32 AM >

_____________________________

Club Saito member #632
Once you hear the sound of a multicylinder 4-stroke, you''ll be hooked forever!

Hide Signatures

(in reply to Iflyglow)
       Post #: 87

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 10:53 PM   
gchdavid


 

Posts: 176
Score: 100
Joined: 2/13/2007
Last Login: 12/10/2012
From: Plymouth, MN, USA
Status: offline 		So...what fuel for flying after break-in since its already broken in?



Play nice guys, I already have the engine, so if I can use it I will, the discussion about it being a POS or not is irrelevant to me, if it is I am already screwed!!!

Chris

Hide Signatures

(in reply to Patxipt)
       Post #: 88

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 10:57 PM   
w8ye



Posts: 36438
Score: 318
Joined: 12/11/2001
Last Login: 5/24/2013
From: Shelby, OH, USA
Status: offline 		The FL-70 was a pretty fair sport engine for general flying around. It didn't take so kindly to being mounted inverted.

For the people that this is all they wanted, the engine did very well.

It had more power than the OS 52 but not as much power as the OS FS70 Surpass I or the II.

_____________________________

Attended the CutFinger Institute of DirtNap University for years but never did graduate....
Recipient, Mangledhand award August 2008
Club Saito Member #7
Original AMA #31261

Hide Signatures

(in reply to gchdavid)
       Post #: 89

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 11:50 PM   
TheRealFrosty



Posts: 53
Score: 105
Joined: 10/20/2004
Last Login: 5/13/2013
From: Lawton, OK, USA
Status: offline
quote:

ORIGINAL: gchdavid

So...what fuel for flying after break-in since its already broken in?





Omega 15% works fine for me in my FL-70.


_____________________________

Kris Frost
AMA #855475

Hide Signatures

(in reply to gchdavid)
       Post #: 90

RE: OS FL 70's, junk or otherwise???? - 3/10/2010 11:51 PM   
Patxipt


 

Posts: 711
Score: 105
Joined: 10/13/2006
Last Login: 5/23/2013
From: Amadora, PORTUGAL
Status: offline
quote:

So...what fuel for flying after break-in since its already broken in?



Play nice guys, I already have the engine, so if I can use it I will, the discussion about it being a POS or not is irrelevant to me, if it is I am already screwed!!!

Chris


i don't knwo what fuel you guys have in the states, but something along 10% nitro would be good enough. Being an ABC ringless engine commercial 2-stroke fuel will do. Some castor in the fuel is always a nice thing to have.

quote:


The FL-70 was a pretty fair sport engine for general flying around. It didn't take so kindly to being mounted inverted.

For the people that this is all they wanted, the engine did very well.

It had more power than the OS 52 but not as much power as the OS FS70 Surpass I or the II.


Mine runs on the bench close to my Saito FA-72. Mind you I use FAI fuel, so the Saito will lack the grunt, close to a 65 four stroke, maybe. It's like an LA series four stroke, at least i like the design of the engine, all curvy, kinda reminds me soviet design.

_____________________________

Club Saito member #632
Once you hear the sound of a multicylinder 4-stroke, you''ll be hooked forever!

Hide Signatures

(in reply to w8ye)
       Post #: 91

RE: OS FL 70's, junk or otherwise???? - 3/11/2010 12:03 AM   
NM2K


 

Posts: 11432
Score: 161
Joined: 1/31/2002
Last Login: 5/24/2013
From: Ringgold, GA, USA
Status: offline
quote:

ORIGINAL: Patxipt

quote:

So...what fuel for flying after break-in since its already broken in?



Play nice guys, I already have the engine, so if I can use it I will, the discussion about it being a POS or not is irrelevant to me, if it is I am already screwed!!!

Chris


i don't knwo what fuel you guys have in the states, but something along 10% nitro would be good enough. Being an ABC ringless engine commercial 2-stroke fuel will do. Some castor in the fuel is always a nice thing to have.

quote:


The FL-70 was a pretty fair sport engine for general flying around. It didn't take so kindly to being mounted inverted.

For the people that this is all they wanted, the engine did very well.

It had more power than the OS 52 but not as much power as the OS FS70 Surpass I or the II.


Mine runs on the bench close to my Saito FA-72. Mind you I use FAI fuel, so the Saito will lack the grunt, close to a 65 four stroke, maybe. It's like an LA series four stroke, at least i like the design of the engine, all curvy, kinda reminds me soviet design.




Either Soviet or Villiers two-stroke appearance from the Fifties or Sixties.

I had one, but never got around to running it (OS FL-70). Someone made me an offer that I couldn't refuse. I didn't have as much enthusiasm for it once I saw the air bleed carb. Weird. I had enough models that could have used an upright or sidemounted engine, so the air bleed wouldn't have made a difference anyway.


Ed Cregger


_____________________________

"Practice makes prefect"


Hide Signatures

(in reply to Patxipt)
       Post #: 92

RE: OS FL 70's, junk or otherwise???? - 3/11/2010 12:05 AM   
gchdavid


 

Posts: 176
Score: 100
Joined: 2/13/2007
Last Login: 12/10/2012
From: Plymouth, MN, USA
Status: offline 		Mine is mounted on its side...will this affect it as bad? it if does it would be as simple as making a bracket so that the carb can be rotated 90deg to point down....hmmmm

Chris

Hide Signatures

(in reply to NM2K)
       Post #: 93

RE: OS FL 70's, junk or otherwise???? - 3/11/2010 12:15 AM   
w8ye



Posts: 36438
Score: 318
Joined: 12/11/2001
Last Login: 5/24/2013
From: Shelby, OH, USA
Status: offline 		They seem to run fine on the side


_____________________________

Attended the CutFinger Institute of DirtNap University for years but never did graduate....
Recipient, Mangledhand award August 2008
Club Saito Member #7
Original AMA #31261

Hide Signatures

(in reply to gchdavid)
       Post #: 94

RE: OS FL 70's, junk or otherwise???? - 3/11/2010 12:52 AM   
eddieC



Posts: 1736
Score: 249
Joined: 11/22/2002
Last Login: 5/23/2013
From: Jackson, MI, USA
Status: offline

Good thing my FL-70 can't read. It's about to start its fourth trouble-free year. Guess I got a lemon!!



_____________________________

I might not be very good, but I am fun to watch!

Hide Signatures

(in reply to Broken Wings)
       Post #: 95

RE: OS FL 70's, junk or otherwise???? - 3/11/2010 1:44 AM   
Patxipt


 

Posts: 711
Score: 105
Joined: 10/13/2006
Last Login: 5/23/2013
From: Amadora, PORTUGAL
Status: offline
quote:

ORIGINAL: eddieC



Good thing my FL-70 can't read. It's about to start its fourth trouble-free year. Guess I got a lemon!!




Do you think OS will accept a return?

_____________________________

Club Saito member #632
Once you hear the sound of a multicylinder 4-stroke, you''ll be hooked forever!

Hide Signatures

(in reply to eddieC)
       Post #: 96

RE: OS FL 70's, junk or otherwise???? - 3/11/2010 2:37 AM   
NM2K


 

Posts: 11432
Score: 161
Joined: 1/31/2002
Last Login: 5/24/2013
From: Ringgold, GA, USA
Status: offline
quote:

ORIGINAL: eddieC



Good thing my FL-70 can't read. It's about to start its fourth trouble-free year. Guess I got a lemon!!






I take it that you are running yours inverted?

That's the problem with old rules of thumb that weren't that good when they were new. I had a few early OS two-strokes with air bleed carbs that absolutely would not remain running through an outside loop. They would run during an inverted spin without a problem, but not throughout an outside loop.


Ed Cregger


_____________________________

"Practice makes prefect"


Hide Signatures

(in reply to eddieC)
       Post #: 97

RE: OS FL 70's, junk or otherwise???? - 3/11/2010 2:38 AM   
blw



Posts: 7635
Score: 655
Joined: 3/15/2004
Last Login: 5/23/2013
From: Opelika, AL, USA
Status: online 		3 or 4 members will find their posts either removed or edited. This *COULD* be a good discussion on the merits, or lack of, on the OS FL 70. Some of the comments go too far and are now bashing, and those comments are gone. Also, the forums are no place to *go after* another member because you disagree. In fact, RCU is the wrong place to wage flame wars.

Whether this thread stays open and active is up to you guys. Here is the link to the rules of posting: http://www.rcuniverse.com/forum/m_377662/tm.htm.

_____________________________

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

"It doesn''t take but one Auburn man to be a majority" -
Coach Pat Dye

Hide Signatures

(in reply to Patxipt)
       Post #: 98

RE: OS FL 70's, junk or otherwise???? - 3/11/2010 4:47 AM   
Iflyglow



Posts: 3777
Score: 122
Joined: 10/26/2002
Last Login: 5/19/2013
From: Clintonville, WI, USA
Status: offline
quote:

ORIGINAL: Patxipt



Mine cost a little over the regular price for a OS FS-30, new.


Thats because the OS .30 is overpriced too! You could buy a Magnum .70RFS which is a copy of the OS .70 Surpass, and have a far better constructed, and longer lasting engine even though it is from China. Look at the drive washer assy, and the hole through the crankshaft engaging the drive washer with a pin. I have never seen such a setup in all the years I have been involved in the hobby. If this engien was marketed by Magnum, it would have probably cost about $75.00.

< Message edited by blw -- 3/11/2010 6:48 PM >

Hide Signatures

(in reply to Patxipt)
       Post #: 99

RE: OS FL 70's, junk or otherwise???? - 5/28/2010 7:58 PM   
gchdavid


 

Posts: 176
Score: 100
Joined: 2/13/2007
Last Login: 12/10/2012
From: Plymouth, MN, USA
Status: offline 		I have an FL-70 that I have owned for about 4 years. I did the break-in in 2006 and flew it many times that season. Then, without any after run oil or maintenance of any kind, It sat for nearly 3 years (no flying at all due to business) before I decided I was going to start flying again this season so I opened it up and added after run oil this last winter. The engine runs fine and besides a tiny bit of rust in the rockers I don't see anything wrong with it and it sat for 3 years with nitromethane exhaust residue in the crankcase from the last time it was ran before that.

The engine is also the version that came with the sealed rear bearing. Since the beginning of this season the engine has seen a gallon of fuel and before that it saw a gallon 3 years ago. I have no signs of decreased performance or that anything is wrong with it. However, being a mechanical engineer, I couldn't get past the fact that with the sealed bearing, very little lubrication can get to the cam and rocker/valve areas. I also know that OS had opened up the rear bearing in latter versions. I didn't want to do that because I would rather it be lubed with non-corrosive material so I gave it some thought and realized, this is just like a car engine if you think about it. It has a sealed crankcase and valve train from the combustion chamber. And what do you do in car engines instead of mixing oil with the fuel? You have a closed oil system, so what keeps us from adding oil to "sealed bearing" FL-70's like you would to your car and changing it regularly, say, once a season? Nothing.

Of course I needed to do some testing to ensure that the oil would not find its way from the area between the two crankcase bearings, where the camshaft sits(I will refer to this cavity as the Cam chamber from now on) to the backside of the crankcase where the rod sits and that it wouldn't transfer through the valve bushings into the chamber and get burned. I did some testing, I removed the side Cam cover and attempted to blow in air from the rear of the crankcase where the rod is, I was not able to get any air through the sealed bearing into the front which means lubrication wont go either way. I also tested it blowing into the Cam chamber and none went through to the rear either. I then removed the valve cover and filled that entire area (including the pushrod guides) with thin oil to see if any would permeate into the combustion chamber and none did (this was tested over a day or two), during this test I also noticed that little to none of the oil left in the rocker area for two days transferred to the Cam chamber below showing that these two cavities would require separate oil be put in each one.

My idea is to open the side Cam cover and pour some light viscosity engine oil in there (perhaps something compatible with nitromethane although technically it could be just plain motor oil because its is isolated) and then open the valve cover and pour some oil there and close everything back up. I could then replace this oil once a season. The oil would not go anywhere from there because there is no transfer and the Valve train/Camshaft would get the required lubrication and corrosion protection that its currently lacking.

Anyone have any input on this? It makes sense to me.

Best regards,

Chris

Hide Signatures

(in reply to Iflyglow)
       Post #: 100

Page:   <<   < prev  1 2 3 [4] 5   next >   >>  
All Forums >> Glow Engines, Gas Engines, Fuel &amp; Mfg Support Forums >> Glow Engines >> RE: OS FL 70's, junk or otherwise????
Page: <<   < prev  1 2 3 [4] 5   next >   >>  




Jump to:


 
Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

RC Universe is a service of Internet Brands, Inc. Copyright © 2001-2013.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America


1.625RCU1