This is the Novarossi ROMA .25 7 Port .25 Off Road Truggy Engine. Novarossi, always working on improving their products and staying ahead of the competition, have released the Roma .25 Truggy engine. Designed for U.S. style tracks, which can be small with big jumps, the ROMA.25 offers smooth power delivery with a torque balance between a .21 and .28 engine, increased cooling, and efficient fuel use when compared to a .28 size engine.
Cooling Head: The cooling head of the ROMA. 25 engine is made lighter by making additional holes in the cooling fins. This reduces the overall mass of the engine.
Sleeve: The sleeve has 7 transfer ports and an exhaust with booster ports. The special shape and positioning of the ports, covered by a patent, improves the internal fluid-dynamics to obtain the maximum possible performance.
Rear Cover: The rear cover presents a round shape to optimize the filling and reducing the dead spaces. The steel plate helps to reduce friction and to expand the lifespan of the conrod.
Crankshaft: The Turbo SG crankshaft is made from high quality steel.
Rear Ball Bearing: The outer diameter of 25.80 mm has been adopted in order to avoid ring distortions and to increase fatigue resistance.
Gasket: The inner shape of the gasket has a new shape, and with that more material. Together with a change in material these gaskets are more resistant to high temperatures.
Glowplug: The Roma .25 engine uses a Turbo plug. Turbo glowplugs have a different shape than Standard glowplugs and therefore are not interchangeable with engines that use a standard glowplug.
One word: NASTY. This engine opened up after about two gallons and I did not think it could be as strong as my OS 25XZ, but it's everything advertised. My OS is a bit snappier but this has more grunt. Bottom end goes to the Roma, top end to the OS. Mid-range goes to Roma as well as it's more linear, which I prefer. Of course talk is cheap: https://www.youtube.com/watch?v=pGr68l3Fbq4
I am a Novarossi fan, honestly in my experience Nova engines are just an average engines when it comes to fuel consumption (average +/- 8.5 minutes), but ROMA exceeds my expectation, I am running a clean 10 mins/per tank on a fast and wide track! Packs a great power yet so smooth. Thumbs UP!
Good powerful power!! I Put a 8.5 venture in went up a clutch bell and made it smooth and faster than expected and still has the power when needed, getting 9 to 10 min most runs . Waiting to see if it does the normal novarossi thing and gains power after a gallon or so, if it does o man is it going to be good..if not it's still a good motor for big tracks
Very powerful! Has a lot of torque which I knew. What surprised me the most is the runtime...timed 10:25 with the 6.5 venturi on a large track with big jumps. I used to pit at 8 with .21's
So, power and great runtime...no need to look elsewhere.