Originally Posted by
Lille-bror
Hi all.
Here is my Team engine - now a lot lighter and lowered CG.
The original Novarossi head weighs 103 gram. The head from my HPI Pro F3.5
HPI part #101589 weighs 72 gram and is lowered a lot (7 mm lower than the Novarossi head). The 4 screw holes have the same position, so why not put the HPI head on my Nova? All it tooked was a little bit of grinding on the Nova house. VOILA the worlds first
NOPI engine!
Life is simple!
The engine performed just great during the race yesterday. 10ºC ambient temp and the engine was approx. 100ºC (made only one temp measurement). 9901 pipe, 41001 header and 5,5mm venturi. When I drag raced down the straight alongside a Ninja JX21-B02 engine with 6,5 mm venturi, my car had the same acceleration and topspeed
. I don't know if the 41021 header would have made similar performance. Didn't have time to make an comparison during this one day race.
BTW: just got my 4,7 mm venturi... I guess it will test my tuning skills to get the settings right...
. Its so different how different engines reacts to venturi sizes: I've no problem tuning Novarosssi engines and my sons old Sirio (Novarossi carb) engine with a 5,5 mm venturi. On my practise engine (STS D21T with Novarossi carb) anything smaller than a 6,5 mm is impossible...