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  1. #1
    LMProd's Avatar
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    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,

  2. #2
    Moderator w8ye's Avatar
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    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
    Attended the CutFinger Institute of DirtNap University for years but never did graduate....
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  3. #3
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    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).
    Joe AP

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    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
    I never met an engine I didn\'\'t like.
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  5. #5
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    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.
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  6. #6
    Richard L.'s Avatar
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    RE: YS FZ 63S equal to 70 Size engines ??

    ORIGINAL: LMProd

    If so what is the advantage of going to a YS 63?
    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.
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  7. #7

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    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.
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    Lancair
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  8. #8
    Richard L.'s Avatar
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    RE: YS FZ 63S equal to 70 Size engines ??

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



    Idle after a couple of tanks on the bench: YS 63S Idling (mpeg). Engine is mounted inverted.
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  9. #9
    LMProd's Avatar
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    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.

  10. #10
    Jim D's Avatar
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    RE: YS FZ 63S equal to 70 Size engines ??

    ORIGINAL: Richard L.

    ORIGINAL: LMProd

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

    Plus, the new YS 63S is lighter than the Saito 72.

    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.
    Jim Davenport

  11. #11
    JoeAirPort's Avatar
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    RE: YS FZ 63S equal to 70 Size engines ??

    ORIGINAL: Jim D

    ORIGINAL: Richard L.

    ORIGINAL: LMProd

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

    Plus, the new YS 63S is lighter than the Saito 72.

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

  12. #12
    Richard L.'s Avatar
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    RE: YS FZ 63S equal to 70 Size engines ??

    ORIGINAL: Jim D

    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.
    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:



    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.
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  13. #13

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    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
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  14. #14
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    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
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  15. #15

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    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
    If it stinks and turns tree trunks for propellers, its gotta be a diesel !

  16. #16

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    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?
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  17. #17
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    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.
    Joe AP

  18. #18

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

    Advantages of going to a YS 63
    * 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).

    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.

  19. #19

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    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

  20. #20

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    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
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  21. #21
    Richard L.'s Avatar
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    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]
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  22. #22

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    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

    Thanks
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  23. #23

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    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
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  24. #24

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

    11,300 on a 14X4W on what fuel?
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  25. #25

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    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.


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