I was looking forward to getting an O.S. Max 1.08, but according to towerhobbies http://www2.towerhobbies.com/cgi-bin...4p?&I=OSMG0310, it's discontinued. They recommend an O.S. .91 FX for it's replacement. Would this work?

If you want the power of the 108 then maybe you should look at the new 120AX.

As kits if folks like to say ¨theres no replacement for displacement¨ so while you might use a 1.08 and a 91 in the same model they would not be substitutes.

So if you are looking for something with more juice than a 91, I would look for a 1.08 on ebay or here on the marketplace or like FLYER said the 1.20

The .91FX is a 90 in a 60 case. The 1.08 ia a completely different animal,
and puts out way more power than the .91.

FBD.

I have 2 of them. Not even on the same page as a 1.08. Think twice on a 91fx. Go with the 120ax. You may find some NIB 1.08s for sale if you look hard enough

G'day
Go for the 120 ax it is a great engine. I have it and quite a few members at my club have it and we all agree that it is an excelent replacement for the 108. I have put it in a plane built for the 108 and glad I did.

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It seems like yesterday when the .60 two-stroke was the big iron of the day. Most modellers in my area (southern NJ) flew .19 - .40 sized engines. There were no .50's, since most had gone out of production in the very late sixties or early seventies. Those still being produced were nearly as expensive as a .60. My second OS R/C engine was a .58. Super Tigre made .51s and .56s, but they were not cheap. None of them were cheap in those days. OS was cheaper than Fox and K&B, but it took them years to equal their sales, much less exceed them in sales. They were considered "Japanese Junk" by many folks. You know, the same kind of folks that are not calling Chinese engines "Chinese Junk". Probably their progeny, now that I think of it.

My how times have changed.

I see folks showing up at the field with less than two years flying experience pulling four and five hundred dollar models from their vehicles. Of course, these models are usually equipped with three hundred dollar engines and five hundred dollars worth of servos. Add up all of this money, plus the money of the radio system (minus servos) and the accessories to make it fly and you have nearly as much money invested as what my brand new 1968 Rambler American cost new sitting on the showroom floor ($1,700 USD). I'm dead serious. No, I have not adjusted for inflation. There wouldn't be any shock factor in that.

Were I looking for a strong enough 1.20 today, I would buy the Saito 1.25 and pump its snorkel full of nitro-laced fuel. I'm pissed at OS for making the 1.20AX butt ugly. I don't doubt one little bit that it is a fine engine. <G>

Well, your wonderment, amazement, whatever (not really sure exactly WHAT you were trying to say) at the "newbies" with the expensive planes and motors can also be applied to the cost of "nitro-laced fuel". Again, I must assume here, but I'm guessing you're referring to the 30% nitro heli fuel that the larger Saitos thrive upon.

I ran this stuff for a while in my helicopters, but when my bulk-purchase contact left the business and I had to start paying regular price ($27 per gallon) for it, my enthusiasm waned rather quickly and I went back to 15% fuel.

I love flying the larger planes, but do not intend to spend a major chunk of my modeling budget on fuel. So I'm keeping a few small glow planes that don't guzzle the Cool Power 15%, and going to gas for the "big iron".

<<...OS was cheaper than Fox of K&B...>>

Man... that's difficult to imagine. I realize you began the hobby long before I did. When I started in 1986, the LHS guy tried to foist one of those miserable K&B Sportster engines on me. I bought an OS 40FP mail order, and haven't looked back.

BTW, 7aso, I too have an OS 1.08 (in an H9 ShowTime), and I'll echo the sentiments here; it is a lot more engine than the 91FX of today.

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Did you ever wake up in the middle of the night, fire up the computer and then start typing away, but wasn't really awake? That's what happened. I don't know what I was trying to say either, but it could have been much, much worse. <G>

Nope, a .91FX is not going to fill the power producing place of an OS 1.08. The 1.20AX seems like a worthy replacement, but why did they sweep the cylinder fins backwards like that? I doubt that it needed the extra cooling capacity. No engine needs extra weight. Why?

They (OS design team) must have had a burst of the Anime' virus running through the place when they designed that engine. The same virus that made all of the chrome doo-dads come out crooked on the 2006 Kawasaki motorcycles. Glad I bought the 2005. At least the chrome is straight. <G>

If it were not for all of the excellent 20-26cc gasoline engines that have been apearing lately, I too would buy an OS 1.20AX engine. However, with the US modified SPE 26cc and 40cc engines becoming available for the same price as the 1.20AX, it is a no brainer to buy an engine that burns much cheaper fuel and produces close enough to the same power as the OS.