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> > It gives you close to O-200 power, they claim, with much lower costs > > (the > > displacement > > is up around that of an O-200). > One would > think that if you get more power out of the same parts then it won't be > as reliable or durable. The C85 plus the STC will not produce significantly more power than a srock C85. Legally, because it is still a C85 and practically because it's coupled to a fixed pitch prop. You will find that the conversion climbs better because it is able to turn more RPMs in climb. But it's still making less than 85 hp as it climbs below redline. In cruise, you can't exceed redline, so you can't make more power. One way to get a little extra out of it is by repitching your prop a little higher (shoot for the minimum allowable static RPM). Then you can extract a little more out, but not much. If I recall correctly, the condition of the STC is that the power cannot exceed 110% of rated power, which would be 93.5 hp. The displacement with the STC is exactly the same as the C-90 and O200 (same crank, rods and pistons). The redline is still 2575, higher than a C90 but lower than an O200. For reference, a C90 produces 95 hp at 2675 (with an variable pitch prop and a 5 minute limit). The weak point is the case. Later C90s and all O200s had through bolts on the center main bearing. C85s use studs there,and they often break loose, leading to center main bearing failure. The cases can be repaired/updated by places like Divco, and this is very desirable if you're considering the STC. One advantage the STC has over the O200 is that the mounts remain the same. I'm not sure what the approved way to install an O200 in a C85 equiped coupe is, but if you don't change the engine mount ($$), you're going to have to deal with an engine that's moved forward about 1/2 inch. John __________________________________________________ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] ____________________________________________________________ T O P I C A -- Learn More. Surf Less. Newsletters, Tips and Discussions on Topics You Choose. http://www.topica.com/partner/tag01
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