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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › which O.S. 90 should i buy
10-16-2005 06:10 PM  13 years agoPost 1
nappyroots2182

rrElite Veteran

Moline, il

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my last 90 i had was the c-spec pumped. it had ok power but had the usual problems. should i buy the non pumped with the 3 needle and a perry pump? does the 3 needle help the lean problem. maybe i can get by without the pump? i fly hard but not alot of 3d, more like aggressive pattern type. any help would be great. i would go YS and might still if i can find them in stock but then i have to regear,new pipe, and new fan. i dont know if i can spend that much. what should i do????????

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10-16-2005 07:47 PM  13 years agoPost 2
looseblades

rrVeteran

ocean gate N.J. usa

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if it were me . i would get the os c-spec with the 60 k carb, then send it to james at omi for a cline regulator. you will not be disapointed,this will end all of the problems. if your not in a hurry you clould wait for the os 91 engines that is do out sometime in december from waht i herd,not sur how true it is.
p.s. i tried the perry pump. it was the biggest pia thing i ever owned.

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10-17-2005 12:32 AM  13 years agoPost 3
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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Or wait for version ten, which is due out at any moment.

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10-17-2005 01:12 AM  13 years agoPost 4
Yug

rrMaster

UK. Herts

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I had loads of trouble with my Cspec PS so this week I upgraded it with OMI Viperhead and Clined 60K big bore. Flew it today for the 1st time. WOW Smooth, power to weight of a 50, the dogs gonads. Fuel system is pressurised by crank case so the fuel should stay nice and pure which in turn should give longer clunk line and engine bearing life. Yes, it makes for a very expensive engine but it really is one stonking engine and I am VERY happy.
Go on, you won't regret it.

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10-17-2005 04:31 AM  13 years agoPost 5
Chris.C

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Hong Kong

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Fuel system is pressurised by crank case so the fuel should stay nice and pure which in turn should give longer clunk line and engine bearing life
Yes, another bonus is that you can start the beast with a regular starter because when it stop, fuel can not enter into the engine by the Cline and check valve.

Chris

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10-17-2005 12:38 PM  13 years agoPost 6
nappyroots2182

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Moline, il

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sounds good to me. i was hoping to get by a little cheaper. maybe ill wait for the new O.S..

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10-19-2005 01:43 AM  13 years agoPost 7
Yug

rrMaster

UK. Herts

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OS91Cspec + Clined big bore 60K + Viperhead = mega engine.
However, for less than half the price, the YS does a great job so I believe.

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10-19-2005 02:09 AM  13 years agoPost 8
Vicky

rrNovice

Hong Kong

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I would suggest O.S SZH is best engine as it won World Champion, also 2nd, and 3rd. I wait for debut in fall and buy it.

Vicky

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10-19-2005 09:48 AM  13 years agoPost 9
Dr Lodge

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Guildford, Surrey - UK

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I'm waiting for my 60k cline converted carb from OMI, not big bore or viper head. I suspect this will be one great engine but total price is very high.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-19-2005 12:28 PM  13 years agoPost 10
nappyroots2182

rrElite Veteran

Moline, il

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sounds like the o.s. is the way to go if you have the money. im going to have to go YS as it is cheaper for now unless the new o.s. comes out before i get a motor. thanks for the help.

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10-19-2005 12:43 PM  13 years agoPost 11
Dr Lodge

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Guildford, Surrey - UK

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I can't argue with that. I'm running 15% nitro and 970 pipe so we'll see how that all performs.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-19-2005 12:48 PM  13 years agoPost 12
tris_heli

rrKey Veteran

Lidlington, Bedfordshire, UK

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If your not after that last 5% of power then its a no brainer to go for the ys.

For me, i already had 2 c-spec's and hate to think how much they have cost me (one with omi/cline, the other with the omi/bigbore/cline)

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10-19-2005 12:53 PM  13 years agoPost 13
Yug

rrMaster

UK. Herts

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Has anyone here tried the SZH ?

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10-19-2005 12:59 PM  13 years agoPost 14
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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tris_heli
What difference did the big bore make?

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-19-2005 01:24 PM  13 years agoPost 15
blade3d

rrElite Veteran

New Jersey USA

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\I would suggest O.S SZH is best engine as it won World Champion, also 2nd, and 3rd. I wait for debut in fall and buy it.
---------------------------------------------------------------------------------------------
It should be out in december in Japan.

Blade3d
Rupert

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10-19-2005 03:16 PM  13 years agoPost 16
tris_heli

rrKey Veteran

Lidlington, Bedfordshire, UK

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Dr Lodge - A bigger dent in my wallet ??

No seriously, not really had chance for a back to back session as yet but the big bore model does go like a steam train

Hopefully this weekend i will get chance...

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10-19-2005 03:24 PM  13 years agoPost 17
Yug

rrMaster

UK. Herts

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big bore model does go like a steam train
Does indeed. I couldn't believe my eyes when I gave it full collective - the head speed carried on increasing Governor was off and I hadn't yet tweeked any of the curves since before the mod. My 1st agressive flips also caught me by supprise. It was one of those F*^&k me moments.
It also doesn't seem to use an excessive amount of fuel.

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10-19-2005 04:14 PM  13 years agoPost 18
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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It also doesn't seem to use an excessive amount of fuel.
I can't think that's down to the big bore, I wonder whether its the carb mod or your Viper Head making things more efficient?

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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