blueline

My Feedback: (6)

Good afternoon, I'm getting a Swany Burrito. Its suggested engine size is a .46-.53BB 2Stroke, however, I'd prefer to install a 4 stroke and am new to the nitro game. I was going to get a YS-63 but am going to hold off for now, I've changed my plans am thinking along the lines of an OS four stroke but don't know how the conversion works i.e., torque, power bands, etc. Thanks in advance.

JPMacG

My Feedback: (2)

I have seen the OS 70 and Saito 72 on Mojos or Burritos and they work out well. I don't have first hand experience. I have an Enya 50 2-stroke on my Burrito.

closetguy

My Feedback: (13)

go with the ys 63 for sure,it will have a better throttle respose,less weight,more power,on the up side the os maybe a little easier to tune,i have two ys 110's and a 63 and would never trade them for anything else.
ENJOY!

blueline

My Feedback: (6)

Thanks for the reply guys, Closetguy, since I'm very new to nitro power I decided not on the YS not wanting to "really screw up!" an expensive engine. That was my reasoning behind going the OS route, easier tuning (like you stated and I've heard). If you think a beginner can be successful at tuning the YS I'd still consider it. I'd like to think that I'm mechanicly minded.

fun_fly_3D

My Feedback: (1)

follow the instructions an you will be fine. once you know how to do it, you don't forget.

blueline

My Feedback: (6)

Funfly, what research that I've done its appears to be better to tune a four stroke with a RPM meter as appossed to trying to listen for what is the best "spot" so to speak. Any truth to that?

PropSpinner

My Feedback: (15)

blueline,

If it is any help, I am new to 4 strokes and I found it easier to adjust with a tachometer until I became use to the engine. Plus you don't want to lean the engine out too much while breaking in and I found it hard to hear the point at which the engine begins to peak and then slow down because it is leaning it out too much. After a while you will not need a meter.

blueline

My Feedback: (6)

Ok it's settled, a OS four stroke it is, what do you guys think, a OS-FS52 or 70 Surpass for this bird?

PropSpinner

My Feedback: (15)

70 four stroke is more equivalent to a 46 two stroke.

blueline

My Feedback: (6)

Thanks Prop, 70FS it is then. How does one determine the equivalent when comparing 2S's to 4S's and visa versa? Is there a table that I can refer to or a equasion that I can use?

XJet

I'm going to throw a spanner in the works and suggest you look at a Magnum 4-stroke, probably the 70.

It's cheaper than the OS and puts out about the same power.

Neither will hold a candle to a Saito 82 however -- which (except for the YS63) is the best 4-stroke you can get for 3D stuff.

The downside of the Saitos is that some do shake a bit.

The magnum or OS will work fine -- but don't expect the same stellar performance you'd get from a Saito/YS, or even some of the better .46-52 two-strokes.

By the way, if this is your first profile/3D bird, I'd seriously reconsider the choice of a 4-stroke. A first profile/3D plane is going to get dorked a lot (but the Burrito will take it without complaint). It costs more to fix a 4-stroke than a 2-stroke if you ever break anything. It's also a lot more relaxing to realise that you've only risking $50 worth of engine rather than $200.

Razor-RCU

My Feedback: (50)

Nothing can hang with the YS-63FZ... They are not difficult to tune (IMHO) as long as you get the plumbing right- and the directions show it pretty clearly as I recall. The Saito-72 is light and a real powerhouse as well-

The OS-70 is a great engine, easy to tune and everything but not in the same category as the YS or even the Saito

Irvine-53 and Tower muffler for 2 cy. [X(]

SMALLFLY-

My Feedback: (19)

Your choice is easy. saito 72. Very light. Very powerful (especially with higher nitro fuel) and most importantly very easy to tune. No pressure lines or check valves to mess with, no having fuel spit on you when you remove the line for refilling and the saito engines like the YS engines have good resale when you want to sell it. The os is less powerful and no more easy to tune than the saito. The saito 82 is good as well more power but with a little more vibration and a little more expensive. Check cheif aircraft for there e mail specials

donkey doctor

Hello; I would go with the Saito 72 or 82 depending on your altitude. You will find that the OS 70 is quite heavy, compared to the Saitos, and why would you want more wieght? I like the OS 70, but Saito have fine-tuned the 72 and 82 to make more power without any more weight, and for a 3D flyer, weight is the enemy.

Razorback58

My Feedback: (8)

If you're determined to go with a 4 stroke, then I would definitely go with the Saito. The YS is a powerful engine, but since you said that you're new to 4 strokes then I would go with the Saito since it is simpler to tune. I'd also like to point out that the Burrito has a very short nose and that most of the ones that I have seen with a 4 stroke needed a remote glow since the glow plug is so close to the wing. An OS 46AX or 50, Webra 50, Irvine 53, or even a Thunder Tiger 46 would be good choices for this plane also. And, like Xjet points out, is a lot less of a "pucker factor" while trying to learn 3D. (Yes, you WILL dork that plane several times trying to learn 3D!)

blueline

My Feedback: (6)

Well Damit, just when I made up my mind you guys make me act like a woman, changing my mind again, Ha, Ha! Alright, so now it might be the Saito 82. Razorback, you mentioned an issue about a glow plug being so close to the wing. Can you claifly, I don't understand the issue.

PropSpinner

My Feedback: (15)

I raised the same question when I bought my first 4 stroke and there is no good rule of thumb but you might say that it is times 1.5. In other words you can take a 2 stroke and multiply it times 1.5 and get the equivalent four stroke. You can't really make a rule of thumb because like the other guys say it depends on the brand. For instance YS puts out more power than Magnum. This discussion could go on for ever. What you are looking for in a good 3D engine (4S or 2S) is plenty of power and good throttle response. A 4S provides quicker spool up and more torque at lower RPM which is desirable for 3D flight. Some guys just shoehorn the largest 4 Stroke in that will fit but at some point you have to consider the additional weight.

blueline

My Feedback: (6)

How about RCV engines, they've got great design and engineering.

PropSpinner

My Feedback: (15)

I've never heard of anyone using them in a 3D plane but I guess it could be done. I understand that their main advantage is the ability to fit inside a cowling without a cylinder head sticking out. I would stick with the tried and true brands.

georgec

Blueline the glow plug comes kinda out the backside of a Saito and by the time you put right thrust in your engine it puts the plug close to your wing. All you have to do is have a short ni- starter. It's really no big deal. Saito 82 or72 is the way I would go if you go with a 4-stroke. I learned 3D with a Burrito with a OS46 and it had plenty of power and is a hole lot cheaper than a 4-stroke. Cause like Razorback said you are going to dork it a lot learnig. I bent a crankshaft on mine and the plane surived. That Burrito is one tuff plane. Have fun.

blueline

My Feedback: (6)

Man, I sure don't want to come across as a softhead. But just so I'm perfectly clear on this subject, the reason RazorBack broached the subject of a remote glow starter is due to pyhsical proximity of the glowplug to the front of the wing, correct?

georgec

Yes the glow plug is real close to the wing.

Jack Hyde

My Feedback: (1)

I have a Burrito (my 2nd). It has a YS63 on it now. I have flown it with the YS, an OS 50 and OS 46. They all fly the plane. The YS is more than you need. I like the way it flies with the 50. The 46 is not as good. You might try a 2 strokes until you get past crashing a lot. You can do a lot of $$ damage to a 4 stroke in a crash. I think the idea you need lots of power to get out of trouble is overdone. You can get into trouble with lots of power too. I have never had a mishap that I felt if only I had more power I would have saved it.
I have Mojo60 with a Saito 91 so I am not opposed to 4 strokes or power.