Roelof

Normal NR engines have an exhaust height of 7mm
JP R09 engines I have seen can have 7, 7.2 and 7.5mm
The 2009 standard Flash had something of 7.4mm
The 2009 Flash tuned has.......tadaaaaa...... 8.2mm!!!!!!!! (and the cranktiming was only shifted 1 degree compared to the stock).

But NR is going to higher exhaust ports, also the N21-5T has an exhaust height of 7.4mm

Grinder

iTrader: (2)

Hi. Both tests were done using the 2015 with short conical header. The new flash special is more powerful than the old one. Especially midrange, but not as much as the 35+21.

It also depends on which batch you get. For the past year or so the flash, and 35+21 have been coming with the same crankshaft. Sometimes Novarossi decides to put cranks with a longer crank window, sometimes a shorter one. This is true for the flash, and 35+21. You never know what you will get.

Not the timing, but length from front to back. Some of the cranks match the blocks perfectly, and some have a large portion of the crank blocking the flow below the carb. The ones that match are much better.

This makes more work for me if they don't properly match.

ralphierace13

iTrader: (5)

got a ? when the window is shorter from front to back does that give u more bottom end

ralphierace13

iTrader: (5)

another ? when u modify the knagaroo r u doing the mod for more bottom end or mid or top and when u do modify it does it tanke away from the bottom end.... thanks

Grinder

iTrader: (2)

Not in the way they have done it. I almost think it was to use old stock, or a try to make better runtime. The ones with the matched window run harder.

Grinder

iTrader: (2)

Here is a picture of what I am talking about. The back of the port window is the same, it is the front of the crank that is blocking the flow on the one on the right. Timings are the same.

These were both out of Flash Special engines from a few weeks back.

Grinder

iTrader: (2)

I try to get more top end out of the Kangaroo. It has plenty on bottom, and mid. The mods do not take away bottom end, they only add power in the upper rpm range. It does drink slightly more fuel after the mods though.

ralphierace13

iTrader: (5)

so the one with the bigger window gives u more top end? or just more of everything overall?

also on a track that has a short stright and mostly infeild have u every tried a toro nero team ed i here the low end kills the kangaroo could this be used as a poibilty

Grinder

iTrader: (2)

The larger window gives the engine more of everything. I have not tried the Toro in an on road car. I will have to give one a go.

Stuff Of Legend

iTrader: (1)

?

wingracer

iTrader: (24)

Man, pretty noticeable difference. I can definitely see where that would cause you more work

ralphierace13

iTrader: (5)

anybodody here anything about the reds motors by m rossi

fulcrum2

Hi Uriah,

Novarossi came out with a new plug, dubbed "C8TGH". Have you had a chance to try it with your engines?
I am still struggeling to find good glow plugs since Nova's quality went south.
Which plugs do you recommend for the MM Kangaroo and 35+21 in typical northern european conditions (From 60F to 85F; 55% humidity).
The OEM Kangaroo comes with a Nova 6 plug. I assume that you recommend a cooler one after your modifications, right?

Thanks a lot and best regards, Stefan

Seisick

i believed they were tested in the us to see if they were to impor them
by mugen usa but thats it, you can see it for youself in the hands of
di angelo on his mrx5 in the world in miami, i ve heard the 12 version was
as good as other high end engines

HoboShop

iTrader: (3)

Hey Uriah what is the better buy? What is faster? Murnan rb c10 or Murnan flash?