twostroke

My Feedback: (6)

I just picked up a plane with a older 61 sf on it the bearing felt rough so I took it apart and sure enough they were a little rusty so I ordered new ones. Also the needle valve was missing the little bracket that holds the setting I found that as well and ordered it. I am wondering what kind of power can I will get out of it and were they a good motor, it look to have very little run time on it. Hopefully it will be a keeper!!

w8ye

My Feedback: (16)

About 12500 with a 11 1/2 X 7

Broken Wings

My Feedback: (20)

I believe that engine came in two versions, ABC and Ringed and that it was a long stroke. Check the Classic Pattern forum.

twostroke

My Feedback: (6)

this one is ringed

rambler53

My Feedback: (494)

I have at least six of these engines on a variety of planes and enjoy them all. Some have 7L carbs, some have 7D. The 7M carb on the FSRs took some forum reading to tune them correctly. These engines wake up a lot with a header and pipe.
I just picked another SF 61 up as well and put in Boca Bearings and a Frank Bowman ring.

jeffie8696

Good catch. Ihave a 46SF, simply awesome.

Motorboy

I has same engine as you has..

If the engine are not a piston ringed engine, then the engine are a ABN engine and will not last long. You will be surpised when the nicle are peeled of the sleeve.

landeck

My Feedback: (1)

Non sense! I have three OS 61 SF ABC(ABN) engines that still run great after 20+ years. They all are currently in planes, a GP Super Sportster 60 (20 years old), a GP Super Skybolt, and a BH T-28 Trojan. They all fly regularly without any peeling. I also have a 23 year old OS 46 SF ABC(ABN) that is also in great shape. I have never seen an SF model where the lining peeled.

Bruce

Motorboy

Bruce

Can you tell me these of my picture are nonsense?? :

twostroke

My Feedback: (6)

Great pics, I believe you are the man I spoke to on my wankel engine as well, I use to see this problem on the earlier snowmobiles that used a chrome plating on the cylinders it just fails it seems after time and use. I wonder if the newer ones use nikasil plating like the newer engines in snowmobiles and such.

Broken Wings

My Feedback: (20)

Jens did you buy that engine new? I've never been able to get one to peel.

Motorboy

Yes, the engine was bought in 1987, then engine lost compression after 2 seasons and i saw after the problem was the sleeve lost the nickle layer. Since the engine was converted to a pure diesel engine after the engine was stored away in a lot of year.. Here are the history: http://www.rcuniverse.com/forum/m_4929500/tm.htm

I do not want to make a debate about peeled sleeve here, in RCU can you search after peeled sleeve histories.

ronwc

My Feedback: (404)

I've owned 5 or 6 over the last 20 years or so and never had a problem either, very strong running engines -

stuntflyr

Converted to diesel. Don't those allow one to increase the cylinder pressure a lot? Hmmm...
I have an old SF 46 and 61 and both are ABN and both run very well. I have about 500 flights on the 46 and 100 on the 61, so it may take a long time to see any breakdown. I use 18% to 20% oil in my fuel.
Chris....

Motorboy

I can not like to see the engine be stored lot of years cause peeled sleeve, then i converted the engine to a diesel engine. No problem with cylinder pressure.

RC_Fanatic

My Feedback: (1)

I was digging through some of my "junk" boxes today and discovered a NIB 46SF "ABC" (which I assume is the nickel plated version). What is the output like compared to a 46AX? What would be a good sport prop? 11 x 6? I run 15% nitro, 18% synthetic/castor blend. I'm thinking of using it in a Pizazz I have ready to build.

Konrad

Jens,
That photo is very similar to many engines I have seen with electroless plated liners. I have to admit none of my engines have failed showing such blatant plating failure. As most of the engine I have seen with this condition were run without my supervision I often can't say what the root cause was. May I ask under what operating conditions this happened?

Even my OS 40PS FAI Pylon engines did not fail like the cylinder shown (but they did fail). Then again I was using 80/20 FAI fuel with 100% castor oil.

All the best,

Konrad