OS 60 FP
 

I inherited an 60 FP installed on a old Tower 60 trainer. The motor doesn't seem to have much time on it, however it doesn't run real well. I drilled out the air bleed hole a 64th and that fixed the idle and transition problems. Now I can't get it to run at high speed(in the air) steadly. I has not dead sticked but it studers when flying at high RPMs. I've leaned ,as that what it sounds like it needed. It is running a OS F plug and that has help some and used an idle bar plug with about the same results. It runs so ragged that I swapped it out with my old trusty TT 61 pro. What waste of the TT. I would like to put the FP back in the trainer. Has anyone have any ideas on how to smooth out this old motor? Oh, using 15% all syn fuel. and a 12 x 6 wood zinger and the motor has very good compression.

Gary

RE: OS 60 FP
 

G'day Gary,
If your are using 15% nitro, the OS "F" plug is too hot, put a OS #8 in it & retune, use minimum of 18% oil, you don't state how much is in your fuel.
Tune it like this, start it & run it up to full power, raise the nose of the plane straight up, if it is too lean it will sag & stop, if it is too rich it will pick up lots of revs, you want it to pick up some revs, but not a huge amount, the amount depends on lots of factors, but this will give you an idea.
Your idle mixture should be set so after you have run it to full power to get it hot, take it to idle & pinch off the fuel tube to the carb, the engine should gain just a few revs, before it slows & stops, if it just dies, when fuel tube is pinched, it is too lean, wind the air bleed screw in to reduce the amount of air & thus richening the mixture, 1/8 turn is all you need to move it & retest.

RE: OS 60 FP
 

Toss that syn fuel -- it will wreck your FP very quickly.

The FP is a plain-bearing motor (no ball bearings) and synthetic oil just isn't up to the job when it comes to lubricating the crankshaft.

Within no time, the hole in which the crankshaft runs will oval and you'll start losing crankcase compression -- which means the engine will run erratically and lose power.

Plain bearing (bushed) motors *must* be run on fuel that has a very healthy amount of castor oil in it. At the *very* least you ought to use something like Omega.

Also try dropping your nitro content. While the FP series would tollerate up to 10% or so nitro, they much preferred a low nitro fuel.

And throw an OS#8 plug in that engine -- it's the *perfect* plug for it.

RE: OS 60 FP
 

The FP60 was a very good engine and had a good reputation. But it needs castor oil for the bushing.

RE: OS 60 FP
 

Also, just check/tighten the backplate. I've had an engine or two surge due to a a loose backplate. Like stated above, don't use full syn, use something like Omega.

RE: OS 60 FP
 

Thanks for the info guys.
Alan I have done all that you have suggested in regards to carb adjustments. This is not my first rodeo. This thing has me totally stumped. the fuel, yea I know, not the best to use. It is the end of our flying season and I had a small amount to use up. I bought it from a local shop when I was on a trip and didn't realize what I had until I got home. I asked for some 15% and that is what I got! The shop was probably trying to get rid of it, and pawned it off on a non local dude. In regards to the OS#8 plug, I don't have any of those. I do have some Fox Miracle plugs, how close are these to 8's. I live in a rural area and do not have acsess to a local hobby shop. Most of my stuff is purchased through Tower. Know matter the remedy. I probably will not be able to test any theory until next spring, as I live in Northern Michigan and the flying season is about over unless we have unseasonal weather.

Thanks all for the input.

Gary

RE: OS 60 FP
 

Gary, the Fox Miracle plug is, I suspect, a bit hotter than the OS#8. It is comparable with the OS F. That being said I have used the Miracle Plug in some 60 sized 2 strokes with good results.

jess

RE: OS 60 FP
 

Gary,


This engine not only has a brass bushing bearing, but is also an ABN Aluminium, Brass, Nickel) piston-sleeve design.
Like you've been told by Jim (w8ye), Bruce (Xjet), foresterxt... You must use fuel that contains a good measure of castor oil in it...

Not a mere 2-3% but a good 10% as the minimum!! ...If you want it to last a reasonable timespan and I think you do.


As someone living in the MI USA, you can't say any fuel is not available.

Sig Champion fuels (20% oil, half castor) and PowerMaster GMA (22% oil, half castor - even better) are good candidates, but most model fuel companies make fuel that fit this bill.


These are not mere opinions... It is absolutely imperative!!

Also, see this [link=http://www.rcuniverse.com/forum/m_1850473/anchor/tm.htm#1850473]this RCU break-in thread[/link] to understand this ABN engine of yours a little better.


As to the glow plug, you need to use a medium heat plug, for this engine with 15% nitro fuel.
The OS #8 is OK, but you can also get the [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXJA89&P=ML#mults]Tower Power[/link], which is nearly its clone, for ~1/3 of the price.

RE: OS 60 FP
 

THe Fox Miracle would be the optimum plug if you can locate some 5% nitro fuel, the Fox Miracle is as close to a universal plug as you'll find.

RE: OS 60 FP
 

Hey Hobbsy, I bought a fist-full of Fox Miracle plugs a while back and ended up giving most of them away.

We run 5% nitro around here and found that the Miracles were just too cold.

They'd run okay at full throttle but they made the mid-range run rough (as if too rich) and all the engines we tried them in would lose a couple of hundred RPMs when the glo heat was removed at idle.

Throw an OS#8 in and the engines were good as new again.

I'd say that (in practice) the Miracle *isn't* as hot as an OS#8.

I also tried the Miracles in my 4-strokes and they aren't a patch on the OS-F. They were good for a couple of flights but then they wouldn't hold a reliable idle any more -- almost as if the filament had lost some of its catalytic properties.

This was a couple of years ago and the fuel was 5% nitro, 75% methanol, 20% Castor/Synth blend (Morgans Pink oil).

We now use OS#8 or Fireball Hot or Medium in our 2-strokes and OS-F in our 4-strokes. They all work great.

RE: OS 60 FP
 

As long as you have some time on your hands, pull the head off the FP and check the liner. I have one with fairly low time that peeled the liner and it ran poorly at high speed. Not worth a new piston and liner. I hope that's not your problem.

RE: OS 60 FP
 

TB,


I had an OS.40FP that peeled its sleeve (about 1/4 of the circumference)... I talked with Clarence Lee about it at the time...

But strangely, unlike yours, it "kept on truckin'" for over 30 more hours, before it was totaled in a bad crash...

RE: OS 60 FP
 

Gary ---OS-- spent millions of dollars testing engines to get the right size bleed hole . So you drill it out cause you know better !!!!!!!!!!!!! Borrow some castor from a fellow flyer and beef up you fuel. Now put the idle bar plug in. Stick a pin in the bleed hole and screw in bleed screw till it just touches the pin. The bleed hole should be half plugged now. Leave it alone now. Open high speed about 3 turns and go for it. Set your HS needle for WOT and point plane in the air for lean test.

RE: OS 60 FP
 

I wonder how many "millions" they spent?:eek:
If the LA .46 is an example, they shoulda spent millions more...:) (talkin' about the air bleed hole "debate" here again...)

My FP .60 peeled after less than a gallon...and no, it was not abused. (still in the process of a GMA style break-in when I noticed it )

FWIW mine ran well (albeit shortly ) with a K&B plug and 10%, all castor.

RE: OS 60 FP
 

TP, thanks for the suggestion I will pull the head and take a look. Your suggestion is the only real help in solving my problem.,

RE: OS 60 FP
 

Gary,


Will you please be more specific on the 'sarcastic remarks' you are referring to?
I went all through the replies in this thread and found nothing that I would have regarded as 'sarcastic'...

Furthermore, even if the remarks others and myself wrote about the fuel you engine needs fuel are not to your liking, or you just want to keep on using that synthetic concoction; the stated replies list facts and no-one entered any 'bologna' in his reply into this thread.


When you ask a question on RCU, no responder knows, or even cares, what you want to hear...
Most of us will tell you the simple truth, whether you want to hear it or not...

...If not, maybe you really shouldn't ask questions here.

RE: OS 60 FP
 

TB & Dar..Well I pulled the head and no liner peeling, so I guess that is not the problem. I'm going down state in week, to the big city, and I will get some proper fuel and a new glow plug supply. Then I can start over. The fella I inherited this dung from , couldn't get it to run smoothly either. Thanks to all, for your help and suggestions.

How was that RCKen, thanks for the edit job. Whats up with that anyway. I used no profanity. What languge was to strong, the lecture word or sarcastic word?

Gary

RE: OS 60 FP
 

I think the fuel and plug change will make a substantial difference.
Gary...one of my posts in another thread "disappeared" mysteriously with no notification whatsoever...and there was absolutely no call for it...so don't feel too bad...:)

I hope we don't have an over zealous (pre-kindergarden style language required ) mod!:eek:

RE: OS 60 FP
 

Gary496- You'll have to take that up with RCKen. You can always PM him and ask those kinds of questions directly. At this point, I suggest that you do.

Proptop- You can use this link to see the posting guidelines for RCU. We still have the same moderators around here, and nobody fitting the derogatory description you used. http://www.rcuniverse.com/forum/m_377662/tm.htm

RE: OS 60 FP
 

Quote:
Proptop- You can use this link to see the posting guidelines for RCU. We still have the same moderators around here, and nobody fitting the derogatory description you used. http://www.rcuniverse.com/forum/m_377662/tm.htm



I apologise if I might have stepped outside of the lines...but I was just a bit "bugged" at the time at the thought of one of my posts that consisted of just two "smileys" being removed without so much as a "howdoyado":)

Anyway...I'm over it now...[8D]:D (BTW...those < were the 2 smileys I used in the post that was removed in the Perry pump thread )


"And now, we return you to your regularly scheduled program" :D

RE: OS 60 FP
 

You know a lot about tuning motors, and much about 60 FP.

I cant get steady idle, is this typical of this motor?


Gary G

RE: OS 60 FP
 

We could use a little more info Gary...like what airplane it's in? Tank location, prop, fuel, plug, etc.

It should idle and transition just fine, but if the tank is too high or too low, or the plug is bad/wrong choice for the engine...the fuel is old or not appropo etc. etc.

RE: OS 60 FP
 

My only experience with the OS 60fp was very good overall. It ran flawlessly out of the box with an 11-7 prop on 10%Omega. Power was lower than an old K&B 61 that I replaced it with.