O.S. 4 stroke motor FS-90

[BobFlyer]

What type of fuel do the 4 stroke motors use? I have available
fuel for 2 stroke engines with 15% nito. Is it compatiable with
a O.S. FS-90 4 stroke engine? Want to be sure before I try and
crank it up.


Thanks in advance Bob

[DBCherry]

Bob,
Might get better answers in a Glow Forum. This is for electrics. ;)

But I fly glow too, so I'll give you my take on it. The 15% might be a bit high for a four stroke, but I doubt it would hurt it.

I do generally use two stroke fuel but I add some extra castor oil to it. (An ounce or two per gallon should be sufficient.) BUT, I also know people who run 2 stroke fuel without extra castor, and they don't seem to have problems. (Just run teh engine on the rich side, which we should all do anyway.)

So you know, they DO make four stroke fuels, but I don't think it's worth buying special fuel.

Good luck. The OS is a great engine.
Dennis-

[BobFlyer]

Yep: Made a mistake when posting on the site, forgot about the
electric connection.

I only have electric, except this garage sale
item, too good to pass up. Sport plane in excellent shape, tx/rx os 90, glow starter, fuel pump, all for $50.

Thanks for the input on the Fuel

Bob

[DBCherry]

Bob,
If you decide you want to stick with electrics exlusively, I'll give you double your money for that messy stuff. :D
Dennis-

[Ghostbear]

Although this area has typically been "reserved" for the few electrics guys who do glow too, the RCUNIVERSE.COM site is very active and pretty much glow only.

Give it a try, just don't mention electrics, you'll get the same reaction from them that the electrics guys give you when you mention glow.

I do both, unfortunately, except for the radio, there is very little equipment in common, which doubles your expenses.

GB

[Gerald]

Bob, The FS-91 Surpass II manual has fuel recommendations which are pretty flexible. It says to use a methanol based fuel with not less than 18% castor oil, or a top quality synthetic lubricant, or combination of both, plus a small percentage of nitro - 5-15%.

It says that the engine is tuned from the factory for 10% nitro and 20% lube.

I have read that many folks recommend a lube blend that has a small amount of castor blended with the rest being synthetic. Aparently a fuel with only castor oil can leave deposits on the exhaust valve stem leading to a sticky valve later.

[David Hogue]

Bob,


Sounds like you got a good deal either way, but FYI, if that motor is labeled 90 and not 91, it isn't a Surpass. It's an earlier engine, before the surpass technology arrived, and will not have the power that the 91 does. It's still a great engine, and should
serve you well!!


Later,
David

[B1RD37]

Although this area has typically been "reserved" for the few electrics guys who do glow too, the RCUNIVERSE.COM site is very active and pretty much glow only.


I am new to this group and I may not understand how it works, but it seems to we when the heading on this page is, R/C Groups Discussion > Airplanes - Fuel > Airplane talk > then a member should be free to ask a wet plane question.

Jerry

[Don Sims]

Hey gents and ladies,
This forum is not reserved for electric/glow guys. ALL are welcome. If somebody posts an electric question I generall move it over to E-Zone but welcome anyone who posts. If you strictly have IC then so what! Feel free to post at any time. RCU is a great site and I'm a member there also but I like the format and ease of use over here in R/C groups. Plus there are some very knowledgable people over here.

[Don Sims]

Originally posted by B1RD37
Although this area has typically been "reserved" for the few electrics guys who do glow too, the RCUNIVERSE.COM site is very active and pretty much glow only.


I am new to this group and I may not understand how it works, but it seems to we when the heading on this page is, R/C Groups Discussion > Airplanes - Fuel > Airplane talk > then a member should be free to ask a wet plane question.

Jerry

Jerry,
Feel free to ask or answer any wet question. May take a bit longer for an answer because we don't have quite as much traffic but I do my best to be sure members questions get answered and APPRECIATE anyone who helps other members. When Jim launched R/C Groups I hoped we'd develope as great a community as E-Zone has! We're slowly getting thee, at one time, if we had three posts in two weeks I was happy, now we have several each day.
We're glad to have you here!
Don

[Ghostbear]

I actually bop around 4 RC web communities and RCU and Ezone are the biggest and most active.

I would never say "Don't go over there" about either community and I certainly applaud your attempts to build an audience for glow.

However, both communities are so filled with zealots that you probably have an uphill battle.

However, I, for one, will continue to peruse this board and the rest of RCGroups.

GB

[DBCherry]

I am new to this group and I may not understand how it works, but it seems to we when the heading on this page is, R/C Groups Discussion > Airplanes - Fuel > Airplane talk > then a member should be free to ask a wet plane question. Jerry,
When I first posted that comment (with the smiley) Bob's post had been placed in an Ezone "electric" forum. It has since been moved here.

If you'll notice, I responded to the best of my abilities (I also fly glow), and I am always happy to discuss ANY form of RC with anyone, regardless of where a question is posted. ;)

I was simply making an observation; and that observation was, he might get more feedback posting in a "wet" forum.
Dennis-

[Don Sims]

Also Dennis offers excellent ideas and suggestions from what I've seen in the other forums. We really do our best to geet posts in their place and do screw up, especially since the breakup of Modelling Science. Dennis wasn't out of line if the post was origionally in one of the E-Zone forums. Please don't get offended by the move or his comment.

"I actually bop around 4 RC web communities and RCU and Ezone are the biggest and most active.
I would never say "Don't go over there" about either community and I certainly applaud your attempts to build an audience for glow.
However, both communities are so filled with zealots that you probably have an uphill battle.
However, I, for one, will continue to peruse this board and the rest of RCGroups.
GB"

Thanks GB, but so far the zealots have left their comments out of here for the most part. A lot of the comments in the "Don't tell those electric guys" thread or whatever it was called by Shawn was highly entertaining to me. I personally make a lot of toung in cheek comments all over the forums and don't mind em in here or vendors. I just don't tolerate flame wars for very long.
Don

[David Hogue]

But Don,

Flames are necessary for glow to work right? I seem to remember something about combustion, but not sure....it's been so long ago:D

Later,
David

[Don Sims]

:D ROLF David! Motors yes, posts no. Even electric motors have sparks and heat...:p
Don