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04-30-2004 10:39 PM  13 years agoPost 1
oat OLD

rrApprentice

RC, CA

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Is that true that OS 91 C SPEC haveing lot of problems? Meaning that if I have a choice between OS and YS, I should go with YS? For Freya X spec.

Thanks,
Oat

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05-01-2004 12:06 AM  13 years agoPost 2
jb_turner

rrElite Veteran

USA

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YS has issues also.

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05-01-2004 12:09 AM  13 years agoPost 3
mrNoodles

rrProfessor

Borlänge, Sweden

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YS bearings "might last" shorter, but replace with OS ones after breakin and you´ll be happy

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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05-01-2004 01:44 AM  13 years agoPost 4
Ben-T-Spindle

rrProfessor

Central Illinois

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I have never had a problem with the OS C-spec. I had two OS engines and never had any problems (other than the high cost of fuel).

As others have said the YS has some serious problems so I would definitely stay away until they get them worked out.

Actually the best running large engine that I own is the OS70. It makes almost as much power as a 91, mainly because it runs at a higher rpm, and burns much much less fuel than a YS80 or 91. You might be happier with an OS70. When the MP2 70 comes out in June the OS70 will probably make as much power as the larger engines.

... BTS

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05-02-2004 02:11 AM  13 years agoPost 5
raptorhelis

rrApprentice

utah

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i had i cspec and the psiton ring spun and scratched the hell out of the piston and sleeve and then i died in mid air inverted about 5 feet of the ground. it is no more. i bought a os 91 standard and threw my cspec carb on it and it seems to be just as powerfull as my cspec. the only reason i put one the carb is because i had it.

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04-11-2005 01:35 PM  12 years agoPost 6
Craig Simmons

rrKey Veteran

wolverhampton uk

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os probs

ive had two new os 91c spec in a raptor 90 and both engine have failed..as in the piston just above the ring has crumbled away..but if your engine is from irvine ltd uk ..ian from irvine should repair this for you..and does a good job too..
regards craig/black country models

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04-11-2005 01:57 PM  12 years agoPost 7
Jafa

rrElite Veteran

Sydney, Australia

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If you search runryder you will find just as many people praising YS as OS - and everyone has horror stories that are meant to convince you that one is better than the other (few people will admit they can't tune an engine, they ran it lean, they shortened it's life by using bad home mix fuel, etc).

I think that they are both fine engines, IF you look after them they are both capable of providing good value for money and fun...

With the Freya, you need to buy an 11T pinion and 93T main gear to get a 8:45 gearing ration to get the best out the YS. Where as the OS can be used with the 12T pinion and 95T main gear that came with the kit


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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04-11-2005 02:12 PM  12 years agoPost 8
z11355

rrMaster

New England

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I run a stock CSpec in my Freya (non-Xspec) on 7.92 ratio.

absolutely no problems, lots of power, easy parts if required (none required)

I'd probably use the Delrin 95 gear, not the stock black plastic one
(does the Xspec come w/ the Delrin gear as stock?)

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04-11-2005 02:17 PM  12 years agoPost 9
Craig Simmons

rrKey Veteran

wolverhampton uk

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maybe so

maybe so in most cases i would agree..but i have had os engines for 24 years and never had a problem..but ive had two engine(os 90 c specs)with identical problems..and talking to irvine its not the first....also got an os 70 and the new 37 also webra 60.and one repaired 90 c spec and the piston looks a bit different to the old one....so i dont want a new one just a repair as you can understand..but i do realise that in most cases it is the operater...as a person working in the model trade i must have sold over 500 hundred helicopter in 6 years i recon i can tune a motor....but i recon os are the best and if they have a problem they will soon solve the prob..or i could be very un lucky.
regard and all the best craig/clubman 3d pilot

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04-11-2005 08:56 PM  12 years agoPost 10
Secret Squirrel

rrKey Veteran

New Zealander living in Melbourne, Australia

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It depends which C-Spec you're talking about. If it's the non-PS, 3 needle carb one, that was great, get one of those.

If it's the OS 91 PS I would personally stay clear. All the ones I have had experience have been difficult to tune and tuning has always been a compromise.

I'm pretty disgusted with this engine I have to say and have replaced the engines in my Sylphides with YS 91's which in this instance have been much more consistent and easier to tune.

I am normally a real OS fan, but this engine has given me cause to reconsider.

Si

-------------
Simon Lockington

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04-11-2005 09:12 PM  12 years agoPost 11
AlanR8

rrKey Veteran

Saddleworth near Manchester (UK)

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As others have said the YS has some serious problems so I would definitely stay away until they get them worked out.
Please explain....

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04-11-2005 09:23 PM  12 years agoPost 12
Gary

rrVeteran

Crosby, Texas

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If you can get a 3 needle carb to use on the C-Spec PS it makes it a lot easier to tune. As they are now, they are slightly rich at hover and then will lean out a little at full RPM. I like my C-Spec's though. I haven't had any of them actually fail. I've got one that needs to be resleeved since when it gets up to temp it will flame out which means it's dropping compression.

"Who said obsession was a bad thing"

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