YS FZ 63S equal to 70 Size engines ??
 

I recently purchased a 72 size four stroke engine and noticed a YS 63 sitting next to it. Do the YS .63 engines out put about the same as a Saito .72 or OS 72 ???

If so what is the advantage of going to a YS 63?

Thanks,

RE: YS FZ 63S equal to 70 Size engines ??
 

More or less. Depends on the tolerences in the particular two engines you are comparing. Some 63's are more powerful than some 72's. Some 72's are more powerful than some 63's.

There is a new 63 that is more powerful and lighter in weight. It has the regulator mounted on the intake pushrod tube. Sait has a new 82 that is about the same weight as the old 63. The OS 70 is right in there with them power wise but it weighs a lot more than any of the others.

Enjoy.o

RE: YS FZ 63S equal to 70 Size engines ??
 

It also depends who has tuned the engine and how well is it running. Either of those engines can be more powerful than the other if they are tuned differently (one bad one good).

RE: YS FZ 63S equal to 70 Size engines ??
 

I have flown both the 72 and the 63 on the same plane (Pizazz) Even though the 63 cranks out about 400 to 600 more rpm on the ground (APC 13/6) I can't tell the difference in performance in the air including vertical acceleration.

Denis

RE: YS FZ 63S equal to 70 Size engines ??
 

Gary,

The YS.63FZ is supercharged by crankcase induction and compression.
As far as horsepower output is concerned, it is capable of equaling "normally aspirated" four-stroke engines of .80-.91 cubic displacement.

So it is more than a match for the .72.

It does use more expensive 20/20, or even 30% nitro heli fuel and does not run very well even on 15% nitro, that any other four-stroke will be happy with, but it is capable of spinning typical .61 size props (12x6, 12x7), faster than most sport two-stroke .61s.

Even the defunct .53FZ did that.

RE: YS FZ 63S equal to 70 Size engines ??
 

Advantages of going to a YS 63:
[ul][*] Superior power output.[*] Superior throttle response.[*] Superior engine bearings.[*] Superior cylinder wall lining.[*] Superior fuel delivery due to pressurized fueling system (fuel tank placement is not an issue).
[/ul]
Plus, the new YS 63S is lighter than the Saito 72.

There were many posts in the past on the YS 63 vs. the Saito 72 here. You might want to do a search.

RE: YS FZ 63S equal to 70 Size engines ??
 

It was after reading the comparison threads here on RCU and talking to the few fellow club members who own YS engines that I decided to get one for myself. That and the fact that by buying from Central Hobbies in the USA I could get it for around the same price or cheaper than I could get an OS70 or Saito72 here in Australia. I figured if I was going to spend the money (around 380AUD) why not get the best.
Look what arrived for me in the mail today.
Its going in my new Seagull Decathlon, for now anyway.

RE: YS FZ 63S equal to 70 Size engines ??
 

Ground rpm, which is 300 rpm on the rich side:

http://www.whitetyphoon.com/rc/ys63s/pic-03.jpg

Idle after a couple of tanks on the bench: [link=http://www.whitetyphoon.com/rc/ys63s/idle.mpg]YS 63S Idling[/link] (mpeg). Engine is mounted inverted.

RE: YS FZ 63S equal to 70 Size engines ??
 

Thanks for all the great responce.

I did a search before posting this and did not find a lot. Maybe I wrote the wrong search. The system seems to reject YS 63.
I got two hits with YS F63S.

I will try another with YS engines.

RE: YS FZ 63S equal to 70 Size engines ??
 

From the YSPerformance website:
YS63 Weight 17.9 ounces, no weight listed for YS63S

Tower Website:
YS63S 17.4 ounces

From Horizon website:
Saito 72 weight 16.6 ounces (with muffler)

Let's stick to published fact here.

RE: YS FZ 63S equal to 70 Size engines ??
 

The YS has a fuel regulator on the engine. The Saito does not. Maybe that accounts for some weight.

RE: YS FZ 63S equal to 70 Size engines ??
 

Published fact doesn't mean squat. All you need to do is put both engines on the same micro precision postal scale.

Here is my YS 63S on a postal scale that measures up to 3 lbs:

http://www.whitetyphoon.com/rc/ys63s/pic-02.jpg

I also put my Saito .72 on the same postal scale a while back (didn't have a digital camera back then), and it weighed 17.9 oz with muffler, muffler elbow, prop nuts, and prop washer. The same Saito .72 without muffler, elbow, prop washer, and prop nuts weighed 16.6 ounces. The weight listed on the website is the weight of the engine alone.

RE: YS FZ 63S equal to 70 Size engines ??
 

Mine weighs in at 493 gr with muffler and needle valve (didnt have camera with me at the store scales I used to weigh it), which is EXACTLYwhat the YS instruction sheet says it weighs, which according to my conversions equals 17.39oz.

Richard L, you havent got the needle valve in yours on the scales there ;)

RE: YS FZ 63S equal to 70 Size engines ??
 

A fella at our club has a YS63 in a little scratchbuilt 3D plane of his. He runs a 14x4 APC prop, and when it idles down, it runs so slow, you can barely here it run. Amazing!

Patriot

RE: YS FZ 63S equal to 70 Size engines ??
 

Buy the best, buy YS. They are second to none. They are the top in performance, power, and technology. I would love it if a magazine company (RC whatever) would conduct a "Shoot out" and test different engines of simular sizes..... and publish the truth.

In just comparing what I have seen at the flying field of comparable engine size against my YS110FZ, I have no doubt the YS wins hands down, and with lesser of a nitro content of fuel.

Dennis

RE: YS FZ 63S equal to 70 Size engines ??
 

I have just picked up on this thread having run my YS110 for the first time yesterday.
I truely cannot believe the power or responsiveness of this engine, furthermore all of the people out there voicing concerns as to setup, forget it, al i did was turn the needle out 1.5 turnds it was sweet.

The problem is i am just about or was just about to go out and buy the new Saito 82 but having seen the Ys yesterday iam not so sure and would now consider the 63.

There is a gentleman earlier in this thread comparing the YS with 90 FS which i think is a little bit overkill but will it be as powerfull as the 82.

Example an 82 can turn a 14X4W @ 10,300 on 15% Waddia reckon is the YS up to that?

RE: YS FZ 63S equal to 70 Size engines ??
 

YS 63 and a 70 sized engine is not a fair comparison. The YS is an easy winner IMO.

Now the Saito 82 with a Cline regulator? I just might prefer that over the YS 63. There is a power advantage with the 82.

RE: YS FZ 63S equal to 70 Size engines ??
 

forgot the disadvantages:
* price, saito .72's and .80's are going out the door for $205 right now vs $270 for the YS.
* higher part count. more to break and repair.
* easier tuning. yes some will argue YS's are easy, but the fact is more people will be able to easily tune the saito.

RE: YS FZ 63S equal to 70 Size engines ??
 

CentralHobbies.com lists the YS63 at $240. How much does a Saito 82 plus a Perry pump cost together? Probably about $240

RE: YS FZ 63S equal to 70 Size engines ??
 

The Saito 82 is $249.00 best price. I believe the YS comes in at around $10 more.

I definitely agree with the pump setup although as i have one i will be using a Perry VP30.

So only one vote so far for the Saito

RE: YS FZ 63S equal to 70 Size engines ??
 

$10 dollars more? Here are some prices for the YS 63S:

* [link]http://www.centralhobbies.com/Engines/ys/YS63s.html[/link]
* [link]http://www.hobbybarn.com/[/link]

RE: YS FZ 63S equal to 70 Size engines ??
 

Just saw the Saito at $239 thats a good price. I need to check with my guy see how much he can do the YS for Hobby Barn were doin it for 234 that's also a good price.

Now all i got to do is decide which one to get:D

Thanks

RE: YS FZ 63S equal to 70 Size engines ??
 

flat spin;
Both my .63's turn a 14x4W apc @ 11,300-11,500. I usually go with a 13x4w for faster low end response(hovers!) and very seldom go wot. On a 4.5lb plane they are the bomb

RE: YS FZ 63S equal to 70 Size engines ??
 

11,300 on a 14X4W on what fuel?

RE: YS FZ 63S equal to 70 Size engines ??
 

30% heli. But you only notice the % on spool up. Both were broken in on YS 20/20 and I only see 100-200 rpm difference on the hi end.

RE: YS FZ 63S equal to 70 Size engines ??
 

Dep, Please don't take likw i am doubting you but 11,300 on a 14X4w is incredible over a thousand RPM more than a Saito 82 even if it is running on 30%.
That said there can only be one choice 1000 RPM more with the same weight, as for setup i really don't have any concerns with pumps etc.
However, and here it comes, everyone else running this prop on this engine is getting around 10,300 on 30%. One guy here admitadley flying at 5000FT is getting 10,300 on a 13X4W on 20% are you sure you arenot getting the readings mixed up between the props because if you got 11,300+ on 14X4W then surely dropping down a size would cause the engine to over rev considerabley.

RE: YS FZ 63S equal to 70 Size engines ??
 

Is it true that if you do not run a YS often the gaskets will dry out and performance
is greatly effected ??

RE: YS FZ 63S equal to 70 Size engines ??
 

That's true of any engine that has diaphragms and o-rings. They dry out if not used. Cline recommends leaving a little fuel in the regulator to keep it from drying out.

RE: YS FZ 63S equal to 70 Size engines ??
 

Flatspin;
No problems! I understand where you are coming from. My .63's turn the 13x4W @ 11, 600-11,800 right now. I set them a little rich when I use that prop. My 63's I break in with a 12x8 YS20/20 turning 11,400-11,500. As I down prop, I also increase nitro. This keeps it consistantly in the low 11's. Each person has their own way of breaking in a YS. The first tank is slightly rich on the ground. The second tank I adjust the low, mid and Hi and fly it. It needs to be broken in where you want to run it.

LMProd;
If you fly a YS and then let it sit for an extended period of time then it is practical to change O rings($15). The gaskets are not a problem unless you disasseble the motor alot. I bought a used YS-120AC from Ebay and it ran like crap!(this is probably the reason it was sold!) I changed orings and it will shame a Saito 180 right now! Its an awesome engine and i have $200 into it. The piston was brand new. In process of putting it on a DP Ultimate.

RE: YS FZ 63S equal to 70 Size engines ??
 

I've just gotten back into nitro flying and am currently trying to decide between a Saito 82 or YS 63 for a PacAero Edge...

I've heard the YS's are harder to tune?

RE: YS FZ 63S equal to 70 Size engines ??
 

If you are unlucky then Ys can be a pain but this is becoming increasingly unlikely and my YS110 for example has been a dream from the word go. I have only touched the needles once when the temperature dropped from 30C to about 5c causing it to die after runnig a bit lean. This is the only time it has ever cut after 60 or so tanks.

Just to confuse things though. I am also running a Saito 82 and i don't care what anybody says the YS63 is not as powerfull. I am still running mine in and it is great. I turn a 14x4W at about 9800 on 20% and I havn't even leaned it out yet, I think on 20% i may need abigger prop so as i don't need any extra power i'll probably just save some cash and us 10%

RE: YS FZ 63S equal to 70 Size engines ??
 

Yeh, saving cash on the 10% is also nice. ;) I am not planning on having a 3D ship out of the Edge anyway.. So, I think the 82 might be fine..

RE: YS FZ 63S equal to 70 Size engines ??
 

Both great engines but evne if you did want to do 3d i would say the 82 is the better option. And i love both my YS and Saito.

Engine the enigne whichever you choose[8D]

RE: YS FZ 63S equal to 70 Size engines ??
 

Don't leave any fuel in YS engines. Otherwise, you will get sticky or gummed up regulator. Order a bottle of after run oil formulated for YS engines from here: [link]http://www.pspec.com/[/link]

RE: YS FZ 63S equal to 70 Size engines ??
 

I ordered a bottle yesterday. So what do you do, put the infeed fuel line in the bottle and turn the prop a few times to suck it into the regulator, carb, and engine? BTW, I always run the fuel out of my 63FZ after I'm done for the day. Cline says that he prefers some fuel left in his reg. If the lines are sealed on the inlet and outlet, it shouldn't gum up. Also a pattern flyer at my field who uses 140DZ's says that there is always some fuel/oil in his regulators whenever he takes them apart. So they may never dry just out over the winter months. Last year none of my engines sat for more than a month without being run. Not sure about this year. Depends on snowfall.

RE: YS FZ 63S equal to 70 Size engines ??
 

I just put a few drops into the carb opening and turn the prop over a few times.

RE: YS FZ 63S equal to 70 Size engines ??
 

I just got off the phone with a guy from Performance specialties where I ordered the oil. This is the result of my conversation:

-Do not suck it in through the fuel line...recommended doing just what Richard said: A teaspoon in through the carb air intake is fine. It's the rear bearing that is the most imortant to lubricate.
-The cylinder does not need any after run oil.
-When starting it again, take out the glow plug, hit the spinner with an electric starter while holding a rag over the glow plug hole to keep oil from spraying everywhere. Otherwise the con rod or crank could get bent. If only a few drops is put in then I imagine this is not necessary.
-Also said to disconnect the fuel and vent lines from the engine or vapors from residual fuel in the tank would get into the engine. Leave the fuel and vent nipples on the engine open to atmosphere.

RE: YS FZ 63S equal to 70 Size engines ??
 

Great info. I don't usually use after run oil in my YS unless the engine won't be used for more than a month. Normally, I just drain the tank and run the engine dry at the end of the day.

RE: YS FZ 63S equal to 70 Size engines ??
 

The YS engines are different but no harder (for most folks) to operate . If "different" and "difficult" mean the same thing to you ,it could be a problem .
I have run 10% and 15% nitro in YS engines with fine results. Saito engines in fact benefit from 20% to 30% nitro just as much as the YS .
Cost ? The smooth running ,transition and reliable power of the YS engines has blurred any memory of the little (if any) difference in cost .
Weight ? The YS always puts out far more power per ounce than the other 4 strokes AND allows the fuel tank to go at the CG so your plane takes off and lands with the same CG point .

RE: YS FZ 63S equal to 70 Size engines ??
 

I found the Brit engine review for the replaced .53.
I could not do it without Dave (ZAGNUT)...

It is not where it once was, but [link=http://web.archive.org/web/20020803180433/http://www.nwmas.co.uk/engine_test_ys53.htm]here it is now[/link].

The achived site includes no photos, that take up too much space, the RPM for the 13x6 is for sure below the torque peak (this prop size is way too much load for this engine) and the RPM for the 11x8 is a mis-print.

But if you look at the numbers for the 12x6 and 12x7 props.... There are few contemporary .61 two-stroke engines, even with tuned-pipes, that can better them.