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Model Rectifier Corp . PowerHelis . JR-Spektrum

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Engines Plugs Mufflers Fuel > O.s. 32sx-h - Abc?
 
 
Phoenix-IT
Senior Heliman
Location: Dallas, TX

I'm trying to figure out how to break in this engine. Neither the box or manual say if the engine is ring or ABC. I'm told that a ringed engine needs to avoid full throttle during the break in period, and that ABC needs to be bench broken with a prop at full throttle.

Someone mentioned that it may be a "lined-piston" engine and that this is basically a ringed engine witout the ring. The piston has a small groove near the top but there is nothing in it.

I looked at the exploded view on the O.S. website. The view of my motor shows two options for what's installed in the cylinder. One option, which is mine I guess, shows a piston and liner... the other shows a piston, liner and ring for the ringed version.

Do you think this is an ABC? Is it possible for an ABC to share the same design head and cylinder with a ringed engine? Or is this just a ring without a ring?

Thanks,
Chad
04-29-2002 Over year old.
 
 
Dr.Ben
Elite Veteran
Location: Richmond, VA, USA

The motor is an ABN design. Nickel plated brass liner with ali piston. As such, the engine should be boken in just a bit rich. Running the motor slobbering rich like might be done with a ringed engine is ill advised since the optimum clearance between the brass liner and ali piston is only achieved at proper running temperature. Please.....I don't me lean the sucker out right off the bat, either.

Historically, OS had some issues with the nickel plating coming off, especially on motors run too lean. I know they've modified the plating process on the FX airplane engines. I hope they've done the same with the 32SX. Mine did deplate, and it NEVER had lean run on it.

HTH,

Ben Minor
04-29-2002 Over year old.
 
 
Phoenix-IT
Senior Heliman
Location: Dallas, TX

Problem is, I don't know the difference between a good running mixture and a little rich. I know when it's so lean that it won't run and I know when it's so rich that it won't run... other than that I have no idea.

It was running rich yesterday but it still flew. I noticed that it would bog a bit in the air if I increased the collective too fast so I leaned it out a couple of clicks and it seems to run allot better... but it still has that burbling sound. It was leaving quite a mess on the helipad.

The problem with leaning it out to make it just a little rich is that I am afraid I'll either get the mix dead on or worse... a little lean.

Chad
04-29-2002 Over year old.
 
 
Dr.Ben
Elite Veteran
Location: Richmond, VA, USA

If you are from the Dallas area, there are definitely some heli pilots there who would be happy to tune your ear and motor for proper mixture. None of us was born knowing how to needle a motor.

Ben
04-30-2002 Over year old.
 
 
Dyehard
Veteran
Location: Cedar Bluff, Va.

Dr.Ben, actually OS lists the 32SXH as an ABC engine. I don't think its a misprint in the manual and they definitly know the differance between the different liners, some of them in their broshure are listed as ABL, which is a form of ABN and some as "true ABC power plants". I have to assume they know what they are talking about when they call it an ABC engine. Either way, I would run it only slightly rich while breaking it in.
04-30-2002 Over year old.
 
 
Dr.Ben
Elite Veteran
Location: Richmond, VA, USA

Allen,

I believe the only engines that OS uses true chrome on are the car motors and maybe the marine engines . I discussed the subject with Dave Shadel before I had to replace the liner in my 32SX with his AAC version. I've never seen true chrome deplate from a brass liner. The nickel in my sleeve would come off with a fingernail. It has always been Dave's contention that he would have had much less reason for his OS aftermarket AAC/ABC liner sets if OS hadn't had such a dismal longevity record with the "nickalloy" system.

I can also remember Clarence Lee of RCM criticizing OS whenever they released a motor that was actually ABN but had been called "ABC". Whether OS's reference to "ABC" in the 32SXH manual is another case of misrepresentation versus true fact is debatable. OS never stopped calling the 61 SFN ABC's "ABC", but I know for a certain fact that the later versions of that motor were ABN engines. To this end, you will find that OS now often uses the term "ringless" to contrast those motors which lack a piston ring.

I would be very interested to know whether OS has changed the plating metal in the 32SX from nickel to chrome. What it was when I had my motor is not necessarily what it is now. I've just sent an email to Dave Shadel to see what his latest knowledge is.

Best regards,

Ben Minor
04-30-2002 Over year old.
 
 
Dyehard
Veteran
Location: Cedar Bluff, Va.

Dr. Ben, you could be right, at this point I only know what OS says in their manual and their broshures about the 32Sx. As far as chrome plating peeling from a brass liner, back when the Supertigre 34 was the in engine for 30 size helis, they had a big problem with the chrome peeling and the were definitly ABC engines. I was talking to Wayne Mann about one of mine with a peeling cylinder and he said for a while there was a something like a 50/50 chance of getting one with a good cylinder, but when you got a good one, they really ran good.
04-30-2002 Over year old.
 
 
Dr.Ben
Elite Veteran
Location: Richmond, VA, USA

I guess I should have said, "Never heard of a quality chrome plating job flaking off", such as the ones that Henry Nelson does.

Interesting topic to discuss...............


Best regards,

Ben
04-30-2002 Over year old.
 
 
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Engines Plugs Mufflers Fuel > O.s. 32sx-h - Abc?
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