Hyper 9 & modified NovaRossi

Since everything with "Rossi" in it's name is fast, this engine (NovaRossi N21B09 PS) was a bit of a disappointment; it had a narrow powerband, high rpm, but no real grunt. The idling was unstable too. Those are actually the characteristics of a long stroke engine. Since i have experience with tuning long stroke 2 stroke engines (1 on 1 scale) i decided to give it a go. Luckily it's a simple engine. It's not quite clearly visible on these pictures, but the sleeve is ported, the crankshaft is "scooped" and the intake is timed. The exhaust port is left untouched. The result surprised me. Throttle respons is better, it has a wider powerband with slightly less rpm, power increased big time, better fuel economy (i don't give it full throttle so much anymore), idling is more stable and the temperature dropped. Exhaust is standard HoBao, glowplug is a HPI #5, fuel containes 16% nitromethane,clutchbell is a HoBao 13 teeth, outside temperature was 24 degr. celcius.

Category:

Howto & Style

Tags:

• hobao
• hyper9
• pro
• novarossi
• rc
• buggy
• offroad
• 2stroke
• tuning
• porting
• modifying
• flycamone2

[pittbulldutch]

What clutch are u using?

[2stroke4Me]

@pittbulldutch That's a JVD clutch.

[BUSS0331982]

dat zeker en dat gedoe over milieu moeten ze ook niet aankomen want een kerncentrale is lekker dan.

brushless sucks NITRO ROCKS.

maar denk dat trippertje er ook zo over denkt.

[2stroke4Me]

@BUSS0331982 Helemaal mee eens. Het geluid is te mooi. Wat zouden die Lithium Polimeer accu's doen in het milieu? De fabrikage ervan is al schadelijker dan het produceren van brandstof! Recyclen ook trouwens! Marketing ZUIGT! Groetjes.

[nitrotrippertje]

Ziet er goed uit hoelang op n tankje?

[2stroke4Me]

@nitrotrippertje Bedankt. Nooit zo op gelet, maar over het algemeen ben ik gemiddeld iets langer aan 't raggen dan anderen. Denk zelf zo'n 8-9 minuten.

[2stroke4Me]

@BUSS0331982 Dank je! 't Is leuker dan een brushless, daar valt niks aan te frezen!!!

[BUSS0331982]

ziet er goed uit heb me p3 ook bewerkt haha

[2stroke4Me]

@marshgatelaneposse Believe it or not, it's only 16%. The low weight of the buggy , the clutch and the low friction driveline makes it take off like mad. And good tires offcourse.

[marshgatelaneposse]

that looks strong for a .21 what nitro %