More information needed.
What country?
Into which airframe is it going?
A certified engine/propeller combination into a kit built aircraft may
shorten the certification process for the aircraft.
An non certified engine/propeller combination into a kit built aircraft
could lengthen the certification process and procedures for the aircraft.
In the US, a non certified engine into a "standard" certified aircraft could
impact (limit) the future use of that aircraft to non commercial
applications.


"aerojones" wrote in message
...

Hi,

Could anyone give me a brief overview of the benefits of buying a
certified engine over a non-certified engine? Why do manufacturers sell
both? Price difference? Does the owner have to get the engine certified
after purchasing?

Thank you for your help




--
aerojones