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Engines and Mufflers Having problems or need advice on Engines or Mufflers? |
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04-23-2004, 08:53 AM | #1 (permalink) |
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Join Date: Apr 2004
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YS91 OR OS91
Hi guys i just got a new raptor 90 and i would like some feedback on what engines you guys are running. Can't decide what i want to use. Thanks
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04-23-2004, 09:32 AM | #2 (permalink) |
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I have both and prefer the YS as it is pretty much set and forget. The OS runs fine and makes good power but is a little fussier to needle.
Gordie
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In a dog sled team, if you're not the lead dog, the view never changes. |
04-23-2004, 01:39 PM | #3 (permalink) |
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Join Date: Mar 2004
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YS runs better, OS looks better. Which is more important to you?
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Raptor 90SE YS 91 GY601 TT blades JR 10X |
04-23-2004, 02:34 PM | #4 (permalink) |
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OS does look better. Don't forget your viper head!!
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William James Crazy wife still trying to kill me. |
04-23-2004, 02:39 PM | #5 (permalink) |
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Join Date: Apr 2004
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Are you guys talkin about the new PS version for the OS91?
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04-23-2004, 06:13 PM | #7 (permalink) |
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I really like my YSs. I am fortunate to have three of them and they all run well without any modifications (Viper Head). Now if I could figure out a way to get more than nine minutes out of a tank I'd really be happy.
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Samuel Adams field rep Buffalo Wings field rep Success is the ability to go from one failure to another with no loss of enthusiasm. Churchill |
04-23-2004, 11:41 PM | #8 (permalink) |
Join Date: Apr 2004
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Well I'll take the os side, I have an os with a kline, no ps. The kline makes more tank pressure than the PS does. Viper head and a carb mod done by omi and it runs awesome. Put it next to a ys and it has more power. YS is alot easier to set the needels on though...but OS does ahve more power though.
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04-24-2004, 01:03 PM | #9 (permalink) |
Join Date: Apr 2004
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YS here for me as well. Plenty of power, and they run oh so sweet. Not much fiddeling needed to get them to perform very well. That is what I am running in my Raptor 90, and I love it. Oh, and it is running a MP2 for exhaust. All in all I have 4 YS big blocks, and I have been happy with every one.
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04-24-2004, 02:14 PM | #10 (permalink) |
Join Date: Apr 2004
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I see why the YS engine manufacture has such a strong following. It is a slightly cheaper product price wise (not by much), easy to keep tuned, and just works well by just installing, & 'setting & forgetting'. I bought the OS.91SXH C-Spec/PS engine with OMI viper head, simply because I have had great luck with OS engines/products in the past. Also something I cannot verify myself, having never owned a YS, but it does seem the longevity of the OS ringed engines is quite lengthy to say the least, & I had heard opinions the YS piston/liner/con-rod had inferior usable life when compared to OS, allthough the YS'S ran GREAT until that time. I know the earlier versions of OS91 had crank balance, & also some fuel delivery problems, which probably slowed sales dramatically when the first OS/YS 91's hit the market initially.
I would be interested to see some hard data that the Klein 'regulator' actually produces more fuel pressure than the new OS C-Spec/PS which has a exclusive fuel PUMP. I am guessing the OS/PS has a fuel return line at the carburetor, due to the fact fuel pressure is in fact too high at times, due to the addition of the new pump, and thus needs a release/fuel-return valve for the positive fuel pressure thats being delivered at a rate it cannot consume. Apparently the YS regulator works great & perhaps the Klein does the same for the OS, but I am predicting higher fuel pressure is being generated by the OS pump VS either the Klein or YS regulators. |
04-24-2004, 04:51 PM | #11 (permalink) |
Join Date: Apr 2004
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id go with the YS 91...i REALLY love mine..and it has TONS of power...O yea, i can get 12 minutes, and 36 seconds....yes that is right... of constant 3-d..and no, im not running the engine really lean or anything. I have no mods done to it either...i simply have ViperHead on it...And i know the viper head doesnt had much time to flying...What my set up is a 8.45 gear ratio, and a 1550 head speed.
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04-24-2004, 05:08 PM | #12 (permalink) |
Join Date: Apr 2004
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Corey, your headspeed in one of the things contributing to longer flight times. Most tend to run 1750-1800 on the head for aerobatics. Which does tend to use more fuel. That being said, I find the flight times to be acceptable with my YS 91's.
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04-24-2004, 10:16 PM | #13 (permalink) |
Join Date: Apr 2004
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well, he never said he wanted to use a 1750 head speed...so i said what i can get with a head speed...i can get prety close to 10 minutes on a 1750 head speed
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04-24-2004, 10:53 PM | #14 (permalink) |
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I like the OS PS with the Viper Head @ 24 thou (shims )and the stock PS @ 12 thou that is plus 4 thou over the stock config. Runs smooth and powerfull with a wide tuning band.
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Clint Akins |
04-26-2004, 04:58 AM | #15 (permalink) |
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Join Date: Apr 2004
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YS
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TeamHirobo Sweden |
04-26-2004, 01:05 PM | #16 (permalink) |
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Join Date: Apr 2004
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I'll vote for YS also. Why spend extra $$ to add a regulator to a C-spec? In my opinion the C-spec PS with the perry pump looks like a band-aid fix vs the YS with the tried and true fuel pressurization system that has been in use in YS engines for years.
The YS isn't as pretty as the C-spec though... Angelo
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Kraken 580, OMP M4 |
04-26-2004, 01:15 PM | #17 (permalink) |
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Clint had by far the finest running motors of the weekend. Thanks for tuning motors for the stupid Clint. Mine is running a WHOLE lot better!!
Clints PS on his #1 bird will pull and hold 1870 RPM Headspeed on full power and collective climbouts time after time on a hot day. It is all in the tuning, I used to think my PS's sucked.
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William James Crazy wife still trying to kill me. |
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