I fly the Tornado 280 engine and can confirm it has noticeably more thrust than the smaller Nitro cousin.
I am a heavy pilot whose flown on Vittorazi and Polini motors. This Tornado 280 with three blade prop has noticeably more thrust allowing less running to get up to flying speed in low winds. I love it.
The TORNADO engine has proven to be less reliable than the Nitro motor design with the principal issue being the lower two head bolts, nearest the exhaust, regularly loosen and require retorquing after every 1-2 flights. Our flying group has four (4) Tornados and all have experienced engine failure between 30-48 hrs. The Nitro engines have not.
My TORNADO engine [48 hrs] failed two weeks ago at the 1h26m point in a flight. AC Owner claimed the motor went lean, evidenced by blowby on piston head near lower bolts, and that it was my user fault -- thus refused warranty support. I regularly retorque my head bolts and the max temp stayed within maximum published boundaries 440dF.
The upper piston ring failed and pieces caught on the exhaust port edge damaging the cylinder and gouging a chunk on the top edge of the piston itself. [NOTE: There is a RECALL notice for TORNADO motor piston and piston ring failures but I am told my rings were not the defective ones.]
AC Owner cited my failure to disassemble the motor at 25 hours to inspect the Decompression Port as evidence that I did not maintain the motor. MY local team suggested doing this at 50 hours so I didn't understand this to be necessary or grounds for voiding warranty support.
I have disproved the owner's claim there is no head bolt loosening problem by talking to the two largest schools in my country who use AC motors. They confirm the Tornado bolt loosening problem but indicate they address it by retorquing the head bolts after each day's use.
There was no ownership of the Tornado head bolt problem by AC owner, only denial.
I still really like this paramotor and have ordered replacement parts including the new , lower compression, XC Head to complete my rebuild. I've purchased a Nm torque wrench and will absolutely check the HEAD BOLT torque settings before each flight as part of my preflight.