Qsc480 Power Curve Data

[Jerry Palmer]

Good morning all, I am going on a sea trial / survey on 2005 Tiara 3800 with the Cummins Qsc480 engines. Does anybody have a performance curve sheet on these engines? I have looked every where and the closest I can find is for a 500.

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[Jerry Palmer]

46409199 / 46405922 I believe it is the 490 Tony

[Tony Athens]

Jerry,

 

There was never a QSC 480 engine.. there was a QSC490.. Why not post an engine serial number.

 

Tony

[William Walter]

480 ce

This is the info I got from tiara for my 2003 38 tiara open. I have a 480 ce .Not sure of the engine in the 2005 but probably the 480ce .Note no hard top or canvas.Best case scenario numbers.Bill 

[Dave Carlson]

I think you will find you have 480CE engines in your 2005 Tiara. 

[Gene Fuller]

I do not know where you can find a curve specific to the 480, but you can probably use the 500 with a small reduction if the maximum rated RPM is the same.

I suspect it is not widely understood, but the propeller demand curves are calculated, not measured. The shape is universal, calculated from the RPM to the exponent power “n”, where “n” is typically 2.7. The resulting curve is scaled by a simple multiplier so that the curve passes exactly through the rated RPM and rated power point on the graph.

Cummins uses these standard curves to design the cooling and other system requirements so that the engine will be capable of meeting the expected field performance and longevity.

Gene

 

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Jerry Palmer

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