Ys-120 Fs, Sc, Nc, Ac?  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Ys-120 Fs, Sc, Nc, Ac?
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Ys-120 Fs, Sc, Nc, Ac? - 2/20/2002 2:44:41 AM   
Bamaham


 

Posts: 24
Joined: 1/10/2002
From: Somerville, AL, USA
Status: offline 		Can anyone tell me what the order of progression is for the YS120? I have an old FS with very little time on it that I plan to put in a MW Stearman. I believe this was the first YS-120, and I've heard they run well but the transition isn't real good. I also have a NC that needs some TLC, or should I say PRL(Piston, Ring, & Liner). Did the NC come before the SC or after? What's the difference between the two? Does the NC have any bad habbits? I know the AC was the Air Chamber version, and the FZ is the latest version. I guess I'm just trying to find out if it's worth overhauling the NC or if I should be looking for a new engine.

Thanks
       Post #: 1

1.2 YS - 2/20/2002 8:36:10 AM   
RossiRay


 

Posts: 138
Joined: 1/2/2002
From: Spring Valley, CA, USA
Status: offline 		FS, then AC, then SC and NC, and finally FZ.

FS can transition very well, mine does.

SC vs. NC- SC has higher compression and an air chamber incorporated into the valve cover area. Also SC has an idle mixture needle. Valves and cam are the same.

NC is a very good engine, it is essentially a large valve SF. One option for you is to bolt the NC head onto the SF. It gave mine a 600 rpm increase with no other changes.

Have fun!

(in reply to Bamaham)
       Post #: 2

FZ vs SC? - 2/21/2002 7:09:51 AM   
Huang


 

Posts: 101
Joined: 1/29/2002
From: Stanford, CA, USA
Status: offline 		Just wondering if there is any power & weight differences between the new FZ and the SC?

thanks,
matt

(in reply to Bamaham)
       Post #: 3

YS 120 ac - 2/22/2002 8:43:20 AM   
noahb



Posts: 548
Joined: 1/19/2002
From: Carlsbad, NM, USA
Status: offline 		Does anybody know if the YS 120 AC engines ran good. Did they exibt any bad habbits.

(in reply to Bamaham)
       Post #: 4

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Ys-120 Fs, Sc, Nc, Ac?
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