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C90 crank and cam

md80bob

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Looking for a C90 Crank and a cam. If you have any leads let me know.

Thanks
Bob
 

longwinglover

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Bob,

The flanged crank (p/n 530182) is the same as the O-200.

There are two different cam shafts for the C-90. The "best" (better torque) cam shaft is more difficult to find and is best used in applications with straight exhaust (no muffler). I think if you search the forums for "C90 cam shaft" there is more information.

It is rumored that the C90-14 cam shaft is exactly the same as the O-200, but I have no proof of that.

John Scott
 

doug

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Someone told me awhile back that a C90 is better than an 0-200 because of the torque. That means shorter takeoff, better climb. Any truth to that?

DH
 

JimC

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The C90-14 case shares the Lord mounts with the O-200, but I don't recall the cam being the same (it may well be -- my memory isn't always the best).
JimC
 

JimC

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Doug, once you correct the drafting misplot of the O-200 power curve for 2550 rpm above 26" manifold pressure, it becomes clear that both power and torque are slightly greater for the O-200 at any rpm and manifold pressure that would be used in flight. This drafting error isn't present in the C-90 power curve. The C-90 will produce more power and torque at low rpm, but I've never seen much advantage to having more power at idle when coming down final. That said, I think any J3 pilot would be thrilled with the performance from either a 90 or an O-200.
JimC
 

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