mrramirez

iTrader: (81)

Guys whats the difference between the +4 and +21-5k,
besides the money? More power, less power, more durable?
Thanks.

houston

iTrader: (96)

completely different engine the original plus engines had very heavy cranks which smoothed the low end quite a bit in certain port designs plus 4 is whole different porting design that novarossi itself has never offered in their engine line up they have made them before though plus4 uses the p5 style cranks



plus4 makes more power from less fuel , efficient design

plus4 =smooth yet plenty of power all the way through
21-5k = punchy bottom that runs through mid and falls off at the end , very solid runner

JAMMINKRAZY

iTrader: (17)

Good to know. My TKO ceramic rear has been holding up ok, but I really haven't run the engine too much recently.

mrramirez

iTrader: (81)

Thanks houston that is a very good explanation.
I'm going with the +4. Thanks

Oasis

iTrader: (38)

I like the Plus 21-7..way faster than the 21-5..

houston

iTrader: (96)

plus 21-7 is an awesome engine i have 4 of them

JUD

iTrader: (4)

Houston could you please give the rundown on each engine: p5, plus 21, 21-4, Toro. Bottom end ; top end ; tunability ; powerband . Thanks. I just got my 21-4 and im considering another novarossi but I dont want to get one that is simular to it.

Mr. Twister

iTrader: (4)

Monty, if need to get rid of the Toro, LMK. I have a few spot's for it, thanks bud.

Oasis

iTrader: (38)

I have a Rex Hot Mod P5 and an older Plus 21-7..the 21-7 is a monster, I run the 21-7 in an ST-RR. For me on the tracks that I run on the 21-7 is a great motor, it has good bottom end but it does not over power the chassis (the ST-RR is known to be a bit tractionally challenged) the 21-7 does have a great mid to top end..keeps pulling, anyone who says their not fast is full of it..I rate it above any of my other motors..

Trevor Williams

iTrader: (207)

Monty, go ahead and let Brian have the Toro.........I am gonna go with a plus4 soon as I want the smoothest power delivery I can get..........I have a 9901 w/41005 square header.....what can I expect with the plus4 with this combo, will it be smooth....would a 41021 header be better? Will it be decent for short to medium track applications?

token

The one Drake is running now - - - WOW

JUD

iTrader: (4)

ANYONE??? Thanks

porkchop

trevor get the 41021 header to go with it and it should be good for med to large track but you got run the turbo button imo it make way more power and more millage over the standard button
if you want way more power get the toro the the toro feel like a plug 4 to me till you get up to the top end then it just retarded! well for me it a good thing i like lots motor
lol

mrramirez

iTrader: (81)

What novarossi motor is drake using on his 8t 2.0?

looneytune

iTrader: (23)

Plus 4 and just won the Silver State Nitro Challenge A Main on fuel mileage.