Originally Posted by
Quikturn
Thanks for the info David. I knew someone had to know.
Didnt realize the Novarossi speed/13 was even more powerful. Should have bought one when they were selling the combo for $200 shipped.
Joe
Joe,
well, you know how it is: give humans 30 years to improve anything and they'll make it bigger, stronger, faster... ;-)
Actually, if you take a look inside a NR Speed/13, it becomes immediately apparent why it is more than 1/2 BHP stronger than the original vintage Rossi 3 port. Everything is smooth and the assymetric crankshaft has a special machined "delivery cone" in the counterweight that "injects" fuel into the cylinder's transfer and boost ports. These, in turn, are coated with a Teflon like material which maximizes the flow of fuel into the combustion chamber. The materials and balance are also something to be appreciated - the piston, sleeve, conrod and particularly the design of the intake and exhaust ports with their optimized angles makes the whole lot push this modern RE classic pattern engine squarely into the "beast" category. While the 3-port Rossi delivers in the range of 1.8 - 1.9 BHP, the evolved 3+2 Rossi surpassed the 2 BHP benchmark. 20 years later, Mr. Rossi managed to re-design his engine yet again to produce an engine that approaches 2.5 BHP of raw power.
Opening the throttle on the new Speed/13 is actually somewhat frightening when propped lightly. You get the sense that the the engine is going to rip apart! ...It makes you appreciate the 8 socket head bolts on that combustion chamber cylinder head.
Incidentally, all three of these engines are designs courtesy of the one and only Cesare Rossi.
David