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Looking for a small engine.

Looking for a small engine.

Looking for a small engine.

(OP)
I've been looking and looking for a small engine, an RC size, small engine that preferably would be a gasoline engine as apposed to nitro. The one thing I really need is for it to NOT require mix to operate. Preferably it would have an actual wet sump. I'm trying not to have oily blech exhaust.

Anyone got any ideas?

Keith Cress
kcress - http://www.flaminsystems.com

RE: Looking for a small engine.

When I was a kid my father made models as a hobby. Sometimes he made his own engines as a model, other times he would buy them where they were hidden within a boat. His favoured brand was http://www.osengines.com/ - I haven't seen one for a long time but the vintage (1970's) OS engines were beautifully made.

RE: Looking for a small engine.

(OP)
Mike; Not a one that has a wet sump.

Scotty; OSI are first rate and need only 50:1 oil ratio but still need oil in the gas.

Greg; Right!

I'll look into how the little diesels are lubed.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Looking for a small engine.

Keith,
What's it for?

STF

RE: Looking for a small engine.

(OP)
It's for a UAV project that I'd prefer to not have oily smelly exhaust spewing oil residue all over it, like when I'm done weed-wacking or using my 2-stroke hedge trimmer I end up wreaking and needing a shower and change of clothes to escape the stink.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Looking for a small engine.

RE: Looking for a small engine.


itsmoked (Electrical)
(OP)
9 Apr 17 01:59
"It's for a UAV project that I'd prefer to not have oily smelly exhaust spewing oil residue all over it"

castor oil

RE: Looking for a small engine.

I can't believe the model planes that are now flying with battery/electric power.

You must be aware of them, so I'm guessing you want more than 15 minutes of endurance, and/or a very heavy payload, in which case the Honda posted by Greg begins to look about right.

Have you got a decent guess for wingspan or weight yet?

Mike Halloran
Pembroke Pines, FL, USA

RE: Looking for a small engine.

(OP)
Ah Mike, I'm needing only about 4cc not 25cc!! Not to mention look at those motors on Gregs link. They put out pathetic amounts of horsepower whereas the RC engines that fit in your hand can dump up to 4 hp. I actually need just 1hp but I can't have the bulk or the weight of a 25CC bread-box.

I hunted down several diesel RC engines hoping they didn't need 'extra oil' but they actually do need all sorts of additives like castor oil mixed with synthetic oil. Blech.

I guess I'm going to have to get one of those OSI four stroke gasoline engines that need only 50:1 oil mix and see what kind of residue/mess they make or, I hope, actually DON'T make.

Oh yeah IR, I don't think I'm up for $2k+ nano-turbines!

Keith Cress
kcress - http://www.flaminsystems.com

RE: Looking for a small engine.

Modern R/C engines also come fitted for mufflers, something nobody used back in my day.
I'm thinking that a muffler with internal screens might catch a fair proportion of the lube oil, to be cleaned occasionally, or maybe drained overboard in use.

Mike Halloran
Pembroke Pines, FL, USA

RE: Looking for a small engine.

(OP)
Yes Mike we used to fly U-control combat with 0.35 uncapped engines at our local junior high and it was fabulous. Now you'd be skinned alive for the noise.

Greg I'd not thought of that an excellent point that I shall follow up on.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Looking for a small engine.

Amsoil has an 2-stroke oil that they claim can be used at a 100:1 ratio instead of the 50:1 you're finding specified. I believe it's sold under the name SABER. That might cut-down on the oil smoke and residue you're seeing.

But then, I have to wonder what type of weed whacker or hedge trimmer you're using or possibly the oil to find the exhaust so bad. Maybe your mix is a little oil heavy? I found my 2-stroke Stihl to be pretty good. Doesn't smoke and the exhaust area stays clean using their oil at their recommended mix ratio.

RE: Looking for a small engine.

My understanding is that oil rated for 100:1 mix is suitable for use in engines rated to use 100:1 mix.
That is, you still use the recommended ratio, but this oil is suitable for use at 100:1 ratios.
If your engine requires 16:1, you may use this oil, but at the recommended 16:1 ration.
A logger friend of mine, years ago, found some oil rated for 50:1 and started using it at 50:1 mix in his saw that required a 16:1 mix.
It cost him a large and expensive Stihl chainsaw finding out the difference.

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: Looking for a small engine.

Agree with Lionel about the Stihl oil - my Stihl line trimmer / brushcutter isn't smokey or smelly running on (expensive!) Stihl oil. I've yet to try it on cheap oil.

RE: Looking for a small engine.

No Bill, they claim it can be used at either 80:1 or 100:1 no matter what the specified ratio. I know older air cooled 440cc snowmobile engines specifying 40:1 can use this oil at 100:1 instead because I heard about it from a guy running those engines in a small oval cart.

RE: Looking for a small engine.

(OP)
That Amsoil may be very useful Lionel! I admit I probably am mixing my hedge trimmer and string trimmer mix a weee bit richer though not enough for me to think I'd make much of a 'stink' difference. I'll have to be a bit careful as I know ALL the small RC engines have definite break-in periods where you need to heavy mix the oil for the first hour or two and super slick oil may screw with that. I won't mind bench running the engine rich for that period.

Keith Cress
kcress - http://www.flaminsystems.com

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