2 stroke Vs. 4 stroke
 

I have been out of gas models for 20 years but may build an old pattern ship that called for a .60 size engine. I don't think I want the complexity or cost of a 4 stroke.
I need suggestions for a strong runnig 2 stroke. Are the Tower engines any good or should I stick with OS or Super Tigre?
Thanks

RE: 2 stroke Vs. 4 stroke
 

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Most of the newer .60 size two-strokes are built in larger crankcases than the old pattern engines that we remember. Especially OS and Super Tigre. These two manufacturers have one crankcase size for their .61 thru .91 sized engines. This makes the .61 heavy and large and the .91 weaker than the old .91 engines because of the smaller porting area (bypass port).

Rossi still sells good .61s for old pattern flying and there is a company in the US named MECOA that sells high quality versions of the old Kraft .61 and HP .61, if you can find them in stock. I haven't managed to as yet.

I recently went to eBay and bought three used OS .61 SF engines. These will fly my old pattern models just fine. Yes, it is a crap shoot and you'll pay a good penny for them. So far it has been worth it to me. Would have bought new Kraft/RJL engines if they had been in stock.

RE: 2 stroke Vs. 4 stroke
 

Maybe I did good in selecting a new Super Tigre G.75 for my new Killer Chaos :D

Kaos

RE: 2 stroke Vs. 4 stroke
 

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If you end up needing another .75, please consider the Tower .75. Lots and lots of glowingly good reports. Some say it dominates the .75 class in power and reliability.

Meanwhile, I'm sure you will be happy with your ST .75. Good luck.

RE: 2 stroke Vs. 4 stroke
 

Mecoa also sells the HP Gold Cup which is more powerfull than the Kraft. There is also the Webra from Horizon which may be cheaper than the Gold Cup. Also look at the K&B twist head for about a $100, also from Mecoa. http://www.mecoa.com The Fox .61 would also be a good choice.

If money is no object then check out Jett.

If you are not intrested in SPA competition or just starting thus in Novice, then a good .75 sized engine might be better.

RE: 2 stroke Vs. 4 stroke
 

How about an old school YS-60RE long stroker? Or the OS- "Hanno" if you can find one...

RE: 2 stroke Vs. 4 stroke
 

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Then you need a tuned pipe...

I just bought an old YS .60 short stroke, round head engine. Beautiful. Never could afford one or find one in stock when they were hot.

A friend of mine is sitting on two YS-61 long stroke rear exhaust engines. One bench ran only and the second NIB. I ought to break out my crowbar and see how much it would take to pry them from his hands. <G>

RE: 2 stroke Vs. 4 stroke
 

I am in the process of building a Ziroli 101" B-25. I am in a pickle and being told by two different people that I respect two different types of motors to use in this model. I thought I would send this out to RC universe for some greatly appreciated advise. What type of motor will be the most reliable to use in this giant scale TWIN engine warbird model a GAS two-stroke or a NITRO four-stroke? Gas I think that I would probably end up with a 32CC Fugi Imvac EI and four glow I would probably go with a SAITO 180. I would like to have the sound of the SAITO but I have been told that the Electronic Ignition of the FUGI IMVAC is ALOT more reliable than the four stroke. I think that I am in the same ball park between the two with power and weight specified for the model I am now battling with RELIABILITY??? HELP???
Steve
Naples, Florida

RE: 2 stroke Vs. 4 stroke
 

Gas is the better option for reliability, but perhaps post this the scale/warbird/twin engine forums to get responses from folks that may have built the same model.

Good luck & post photos when done!

RE: 2 stroke Vs. 4 stroke
 

The MVVS engines might be a good choice. the .61/.77/.91 are all around 550 gr (~20 oz.) and you can use them as rear or side exhaust since they have a detachable cylinder (you have to decide before break-in). All three displacements have the same dimensions. I think they use the same case. Also being European make, they were designed to run on 0-5% nitro = cheap fuel.

http://www.justengines.unseen.org/mvvs.htm
http://www.justengines.unseen.org/mvvsdims.htm

RE: 2 stroke Vs. 4 stroke
 

I saw a few two stroke .60's in last weekends Hotlanta SPA contest. Makes that I recall were, OS FX, Webra Speed, and Thunder Tiger. I am sure there were others. More two strokes than the last time I observed an SPA contest. I did not fly but really enjoyed shooting the breeze with several folks. King Altair was there. He had a new King Altair with a Saito 1.25, which (I think) is legal in novice.

RE: 2 stroke Vs. 4 stroke
 

Hey guys,

I was looking for a small base .61 to fit in an old Phantom, my old FSR ABC, SF, Super Tigre, etc didn't fit, untill I got my hands on a Webra Blackhead. Not as powerfull as a Speed, but still enough to get the heavy model in the air.
What i notice ? none of the OS engines seems as stable and thrustworthy as the old FSR's. Not even as powerfull. My SF weighs about 100gr more then my FSR, yet isn't capable to deliver near it's power. While the FSR was capable to get a model lifted (ended up bad :) ), with the SF, I needed 2/3th of the runway, that makes 55m.
Anyway, for the pure power ? Rossi, MVVS, Webra, old OS FSR, and maybe the impeller engines are an option as well , and not to forget Yamada.
I'm prolly going to set up a setup with a Mk Magic and a Yamada longstroke ( NIB), with tuned pipe ( if I can still get my hands on it ), this should take a 13-14/8 up to 12.500 someone told me
If the Yamada is already in use or sold, I will prolly choose Webra.

As my FSR ABC has now become FSR AB, and lost it's chrome plating, I'm deperately searching for a new bushing and piston, or someone capable to repair the Chrome layer ? could use some help/info about that..

Greets from belgium

Steven

RE: 2 stroke Vs. 4 stroke
 

The Saito engines are VERY good engines and will last almost forever if you take care of them. By that I mean, don't run them lean. They are very reliable and have had no problems with mine yet. Just use fuel with 10% to 15% nitro and about 3 or 4% castor and they will probly run longer then you will be around. Taken care of and broken in properly they are the best.

RE: 2 stroke Vs. 4 stroke
 

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I like and own Saito engines. While they are good, they are no better than OS, Enya and YS. Glad you like yours.


Ed Cregger

RE: 2 stroke Vs. 4 stroke
 

Anyone tried the newer Moki 61 Long Stroke?

Here's a Clarence Lee review:

http://www.justengines.unseen.org/moki61.htm

RE: 2 stroke Vs. 4 stroke
 

How about those Jett 2 strokes? They're supposed to be the hottest 2 stroke motor you could buy I thought. I remember asking the Hobby Services rep why OS doesn't make the older style pumped 2 stroke .60's, and his answer was "The new FX series has more power than those older engines; you don't need a pump." Um, sure. I never felt my .61 FX had that much power...but my .91 with a pipe isn't too bad.

RE: 2 stroke Vs. 4 stroke
 

Not sure about the .60 class but in the 45/46 class I've swapped between a os .45fsr os .46sf and os 46fx all on a pipe on and old sweet stik on the same day the 45fsr was slightly more powerful than the sf and the FX had considerably more power than the fsr and sf.Just my experience.