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Magnum 120 or 180 2 stroke

Old 04-22-2005, 05:27 PM
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Hughes500E
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Default Magnum 120 or 180 2 stroke

Anyone running either of these engines? What are they like?
Thinking about buying one for a 72 inch Sukhoi
What kind of props are you swinging??
Thanks
Old 04-22-2005, 05:40 PM
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w8ye
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Default RE: Magnum 120 or 180 2 stroke

These engines are not real common at this time. Don't expect a lot of response.

The more popular engines being the OS 160, Moki/Mark, and Saito engines.

Why don't you try this Magnum set up and then tell the rest of us how it works?

Enjoy,

Jim
Old 04-22-2005, 10:16 PM
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Hughes500E
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Default RE: Magnum 120 or 180 2 stroke

That's no fun
I hate being on the front line!
These engines have been out for quite some time, surely someone has ran one or witnessed one running []
Old 04-22-2005, 10:20 PM
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w8ye
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Default RE: Magnum 120 or 180 2 stroke

I had noticed that you got little response on your previous post down the way.

The has been some talk about them on here in the last year.

Maybe a search?

Enjoy,

Jim
Old 04-22-2005, 11:48 PM
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Flyboy Dave
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Default RE: Magnum 120 or 180 2 stroke

The 1.80 is a powerful and solid engine, and a real value for the money.
Don't make the same mistake some Guys do....it is a ringed engine.
Don't cowl it, install a Pitts style muffler, over-prop it, and expect it to
run on synthetic oiled fuels.

You can cowl it, provided you have proper air flow, and the stock muffler
is used....it will run cool.

The 1.20 is another story. The original 1.20 is actually a 1.29 ,it was never
popular, mainly because there weren't many planes to use them in. They
came out recently with a new 1.20 version....but I am not familiar with it.

I wouldn't be afraid to put the 1.80 Magnum in the big Sukhoi. I don't
think the 1.20 has enough mustard for it.

FBD.
Old 04-23-2005, 12:07 AM
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Hughes500E
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Default RE: Magnum 120 or 180 2 stroke

Thanks guys,
Been searching and reading forever but I thought I would try to get some new updated opinions.
I was thinking the 180 would be a better choice but it's a bit weighty A fella at our field flys his with a Saito 3 cylinder 1.70 but thats even a half pound lighter than the 1.80 AR
Too many choices
Old 04-23-2005, 12:11 AM
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Warjet
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Default RE: Magnum 120 or 180 2 stroke

Both engines are very heavy compared to others in their category, so power/ weight is low. I've had both, they run fine (put an OS 3500 carb on the 1.80 and ran better), just heavy.
Old 07-31-2005, 08:40 AM
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DocDan
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Default RE: Magnum 120 or 180 2 stroke

Very Bad experience with 120 Magnum 2 stroke.
= Very unhappy boy

Heaps of problems getting it to run, finally resorted to OS 108 carb and this improved things lots on the ground.
Ran 4 litres of 10% through it and then sent it up on a maiden flight with my new Excelleron 90 pattern ship.
Was running OK for 3 mins (nice and rich) then ran out of puff and dead sticked. Nearly got it back, but caught the gear in the long grass on the side of the strip, tearing the gear out and throwing the nose into the deck. Smashed the nose and fuse. Checked the motor and the thing has great score marks on the piston skirt, no compression and difficult to over. Thought I must have been running it too lean but found "heaps" of oil everywhere............
Metallurgy problem seems most likely. No more Magnums for me. You seem to either get a good one and they run forever or they are an expensive paperweight, I Promise from now on, no matter how cheap they are, may mantra will be, I will only buy OS I will only buy OS I will only buy OS I will only buy OS.
Old 07-31-2005, 09:05 AM
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Flyboy Dave
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Default RE: Magnum 120 or 180 2 stroke

Were you running synthetic only oil in it ?
Old 12-25-2011, 02:25 PM
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jbacquejr
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Default RE: Magnum 120 or 180 2 stroke

I have been having and running a 120 two stroke for years now. Just bought a new carb for it.
Not the most powerful but reliable!!!
I have about six four strokes and the same quality!!
RELIABLE!!!!!
Old 01-08-2012, 09:44 AM
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Pippin
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Default RE: Magnum 120 or 180 2 stroke

Did you buy an OS carb?

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