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Revolution Models . CarbonXtreme . Midland Helicopters

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Main Discussion > What is the "Best" 90 Size engine on the market??
 
 
RC Hobbies - NZ
Heliman
Location: New Zealand

Hi Guy's,

Just after some feed back as to what people think the best 90 sized engine on the market is and why?

We are just in the process of building up the new X-treme 90, AKA "The Dominator" and would like to put the best power house in it.

Your thoughts are much appreciated!

Regards



Grant
RC Hobbies - NZ

Team RJX
05-13-2008 01:13 PM
HOMEPAGE  
 
 
tailspin90
Elite Veteran
Location: Portage, IN

Only 2 real chioces at the moment.

OS or YS


I like YS due to the fact it uses crankcase pressure vs OS that uses muffler pressure.


Either or you really can't go wrong.


..........Joe

Local Smart A$$......JR Helis Rule!!!
05-13-2008 01:22 PM
 
 
gullie667
Veteran
Location: Raleigh, NC

I heard Nova Rossi makes a wicked 90 heli engine. Expensive and difficult to tune but it is also supposed to be another killer engine from them.

Gullie

Helicopters - 1000 parts flying in formation.
05-13-2008 01:22 PM
 
 
MrMel
Elite Veteran
Location: Lidingo, Sweden

YS91SR (long stroke) amazing torque
05-13-2008 02:08 PM
 
 
RonHill
Veteran
Location: ..

The YS in my opinion is the top 90.

The Nova Rossi 50 has some good numbers, the 90 less impressive but still good. I had a shop send me a 50 to try out and review, but the mounting holes were wrong. Rossi actually sends a Raptor mount with the engine, but I was not going to put it in one. The shop was going to send me a new one (H2) that supposedly had the right mounting system, but they never did and it was not a big enough deal for me to ride them about it.

One thing about the NR engines...Just from my research, they like lower nitro and tuned pipes. They are very temp critical since they are ABC engines.
05-13-2008 05:09 PM
 
 
Flight Engineer
Senior Heliman
Location: Wellington, New Zealand

I can see this quickly degenerating into a YS vs OS thread but here is my local NZ opinion (for what it is worth). From my previous expereince with using both the YS and the Webra, and also being involved in guys here that have been setting up OS90's cspec/SZ pumped etc, I really preferred the positive crankcase pressure and easy to tune (with three distinctive needles)nature of the YS. The only point being is NZ where fuel price is an issue is that from my expereince YS engines don't really like running on less than 20% nitro.
So get the YS(SR) Grant as I am very interested in this new RJX90 (vs the T-rex700) and how it performs with the YS and any fit issues (fan collets etc)will be great to know.

Dean
05-13-2008 08:38 PM
 
 
JAGNZ
Elite Veteran
Location: Auckland, New Zealand

Hi Grant. OS-SZ Non Pumped. AWESOME power, little fuss (no extra plumbing), relatively cheap, easy to tune with a CarbSmart installed. Has a much better carb than the old C-Specs. Get an OS Bubbless Clunk to go with it.

Jason Greenwood

Fury Extreme, 2X T600N's, Trex 500, DSX9 2.4
www.3dheli.co.nz
05-13-2008 08:49 PM
HOMEPAGE  
 
 
payne1967
Veteran
Location: warwick uk

don't put the os pumped motor in the pump is more hassle than its worth
if you go os use the non-pumped motor
my webra 90 has lots more power than the os90's i run and on low nitro
05-13-2008 09:05 PM
HOMEPAGE  
 
 
kogibankole
Senior Heliman
Location: albuquerque

id say the ys sr hands down. At like 6000ft above sea level performance suffers at this altitude due to the lower oxygen level and the thinner air, however a buddy I fly with has a YR SR in his synergy, and its almost unboggable. I mean wicked power! But not more power than my logo 14 running on 12C prolites!

if im not blade bogging youll find me pack puffing
05-13-2008 09:35 PM
 
 
raptorheli2
Elite Veteran
Location: rip off britain and no changing it

there is thunder tiger 96 or 98 in this months MHW......don't know anymore details on that.

cheers


www.waterfoothelis.com
05-13-2008 09:49 PM
HOMEPAGE  
 
 
JAGNZ
Elite Veteran
Location: Auckland, New Zealand

There is also the TT 106 coming. Whoa.

Jason Greenwood

Fury Extreme, 2X T600N's, Trex 500, DSX9 2.4
www.3dheli.co.nz
05-13-2008 10:03 PM
HOMEPAGE  
 
 
MattJen
Elite Veteran
Location: UK,Gravesend, Kent

having used a YS ST, SR, and OS and a webra 90,Toki,TT,

Out of all all of them i have found the YS SR, the best engine for my style of flying.

I found the OS had more power using 20% nitro coolpower, but the YS was smoother and quiter and a lot less fussy.

The ys like anything from 20% nitro or above, below it i have found they are unhappy.

That is my experience only. I fly F3C style.

Matt Jenner

I bought my Mother-in-law a chair for xmas, but she wouldn't plug it in
05-13-2008 11:03 PM
 
 
RC Hobbies - NZ
Heliman
Location: New Zealand

Thanks guys for your feedback..... I will let you know what I put in the beast and give you some feedback on the new machine.

I think I will call for the help of an experienced 3D master flyer to put it through it's paces as I think my loops, rolls and stall turns won't do it any justice.

Regards


Grant
05-14-2008 10:23 AM
HOMEPAGE  
 
 
tailspin90
Elite Veteran
Location: Portage, IN

Quote 
there is thunder tiger 96 or 98 in this months MHW

Quote 
There is also the TT 106 coming

One and the same motor. I talked to the TT Reps at toledo and they said that the 96 is expected to actually be a 106 when it actually comes out.

Time will tell if it's going to be any better than the YS or OS options.


..........Joe

Local Smart A$$......JR Helis Rule!!!
05-14-2008 11:05 AM
 
 
Nick Jones
Key Veteran
Location: Redding, CA

-RCer
05-14-2008 12:24 PM
 
 
raptorheli2
Elite Veteran
Location: rip off britain and no changing it

ahhhh, nice looking bit of kit....looks like will need a specialist muffler for the engine tho :-(

cheers


www.waterfoothelis.com
05-14-2008 12:39 PM
HOMEPAGE  
 
 
Arild Johansen
Heliman
Location: Norway, Flateby

Interesting with the TT 106 when i come’s out. What I don’t like from the pictures is the exhaust port! The bottom hole has threads into the crankcase. I have many bad experiences with threads in aluminium where vibration is an issue. Where the hole is located it isn’t to much thickness either.

Arild Johansen
05-14-2008 12:50 PM
HOMEPAGE  
 
 
S Bell
Senior Heliman
Location: Nova Scotia Canada

I believe the reason for the third bolt has to do with the exhaust port shape. It's designed to encourage gas flow/performance by lowering the local pressure, to do this it has to be the shape it is. Like the redline 53, they are paying attention to all the small details. If they used two bolts with such a wide opening it would likely leak or have vibration induced issues. The YS uses threaded bolts but in flight the muffler stays put (when installed correctly), it's the crash resistance that may suffer. The other choice is a conventional exhaust port with conventional potential.
I think I just might like this exhaust port!

Stephen

Raptors are everywhere
05-14-2008 09:06 PM
HOMEPAGE  
 
 
Yug
rrProfessor
Location: Niatirb Taerg

The Cspec with Viper Head and OMI clined big bore has always been one of my favorites. Never got round to trying a YS though.

Team Solar Driftwood
05-14-2008 11:34 PM
 
 
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Main Discussion > What is the "Best" 90 Size engine on the market??
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