Check out Mike's MR21R01T. Post #721. And also the new Ninja hardcoated titanium pipe. No springs holding the manifold & pipe... :sneaky:

http://www.rctech.net/forum/showthre...51#post3022251

How many shims do you guys run in the .21A? i added a third shim for breakin but can I take it out now?

Hahaha!!! how cruel. :D :D :D I'm pretty sure that he didn't missed to re-install the springs before hitting the track.

I left all three in (at sea level).

Actually, Ninja has a new sealing system that does not use springs. Look at a few posts back and you'll see the off-road pipe without springs too (no holes etiher).

They are threaded, very cool :D, When are you sopposed to change your conrods? two gallons? My .21A is holding up very good so far with 2 gallons through it. I've been runnin about 230-240.

So the heads for the Falcon's is Magnesium or Magnesium look?

I believe they are the real thing. I skeptical of magnesiun though, brittle at high temps?

Looks don't matter much 2 me. The Ninja kicks ass!!!!!!!!

Which temp gauge are you using with your Ninja? With an Exergen, temps should be around 270-290. You may never have to change your conrod if you are running lower temps. The A has a stronger conrod, so it will last longer. But to be safe, I'd inspect it carefully for excessive play around the crank and pin, then decide. :tire:

What percentage nitro is the MR21-R01A shimmed for out of the box
and why do you get a extra shim.
I will be using 25% fuel.

Thanks

I added a third shim because there was so much pinch I couldn't break it in smoothly. I run 30%.Wow 270-290? that scares me, I can't afford a new engine that quickly :D thanks sohlman

Exergen :sneaky:

gashuffer, with the design of the head on the Ninjas, the exergen is closer to the plug than other heads. DO a little test, get the engine up to temp then take a temp with it down in the head and then raise it to where it would be flush with the top of the head. You should see a 30 degree change or so. That difference is why people say run it at 270ish because when you take that change away it drops it down to about 240(if a normal head was used with a hole that the temp probe wont go into) which is where most other engines run at. As long as you have smoke coming out in every corner and you still see a slight haze at the end of the straight at full speed, the temps are not a worry. Only time they should bother you is if they are unreal high, like 350+ and there is no smoke coming from the pipe exiting corners or at top speed.

Exactly right T. I ran my Ninja at the Nats at around 300-310 deg (with Exergen) and it ran great.

Tomorrow I will get my. :D I´m realy curious about, how the performance will be.

I hope it will be the same like my Plus 12-3 :D

I heard a little rumor...the MR12s are in stock at Mugen USA. :nod:

Are the older plain ninjas still ok to buy or should I wait for the ones with new heatsinks and or ceramic bearings (if there is a version with them).

They never offered the 12s til now. So this will be the first version available to the public.

The 21s are all fine. Ceramic bearings are a great upgrade to any engine, but not always needed if you want to save some loot.

Gotcha. So the Ninja that been wining some of the events were modifieds I assume? I trying to recall if Swauger been using a stock or modified Ninja. I'm in a toss up between them and the Sirio STI which I've been watching some of the locals beginners using as I helped them tune it. Hopefully there will be some at the WRAM show on sale as I'm still a bit skeptical of the ZX12s crankshaft issue. The ones they will sell aren't the 06 version.

I'm sure swauger gets a "special" ninja. I heard that ceramic bearings for engines do not last very long because the nitro dries out the plastic bearing housing and they crack. Alittle over 2 gallons now and my .21A is still very strong. No leaks or conrod wear either :D I'm pushing towards 260-270 on my next run :sneaky: :tire:

Hark,

Except for having Ceramics, Mikey's been running the stock version all this time like when he was at the '06 1:8th Nats in Ohio, etc... The Winternats in Florida, is the only time he had the Mario Tuned Version.

Personally, I've been using the box stock version myself (non-ceramics). And I find it has plenty of power to give.

Well from what I've seen, the Ninja is a realllllly good engine!!! I've been a novarossi fan 4 the longest. But from what I seen in Ft Myers, the Ninjas r the next big thing!!

Yeah Pooh, Fort Myers was my first time running something other than a novarossi based motor. I was impressed by the ninja. I want to try the tuned version now.

:nod: :nod: SWEET!!! :nod: :nod:

It is true! :nod: We are shipping out the .12 and .28 engines today! :D

Any specific break-in recommendations for the .12 engine? WOT? Not WOT? How have the Team guys been doing it??

Thanks! :)

I used a stock Ninja all of last year. This year I will be running the Mario Tuned Ninja.

I just got back into racing and I'm running a 5 year old (but nearly brand new) mr12 5 port turbo. Are the new mr12s completely new from the ground up or are they new and improved from the old version? Any characteristics they share? power band? torque? Also will they be making a 5 port version?

Thanks for the reviews Mike, Ron. C, Pooh, Sohlman. Hopefully there will be some on sale at the WRAM show this weekend. :D :lol:

Hey Randay,

The MR12 that you own is a Novarossi based engine. The Ninja MR12T is a brand new engine from the ground up built by GRP. There will not be a 5 port version of this engine.

ninja
 

SOLOARTIST + NINJA :eek: oh boy my feet are getting hot :lol: :lol:

Ninja MR12T01A !
 

They're on the way !!! ... Hee hee...

Bump. :sneaky:

Comparison
 

I am going to buy a new engine for our outdoor season....

I'm looking at the Ninja, Falcon, Boss or the new Nova..coming out this Summer...

Pros/Cons ???

What is the cost on the new .12's? Are they all coming as a engine & pipe combo?

I've seen some racers blewup their mR21's.. :nod: :confused: :confused: :confused: but on mine i never had problems.. for now. :D i've tried ceramic bearings their good. murnan selln CB for it..

Does anyone know what the needle settings should be or at least a good starting point? My engine today kept bogging big time when i started it up. When the engine came up to temp it was fine but I pulled it off the track today at 270, it seemed to have the right smoke though,I can't tell yet. Still tryin to figure things out. Is it ok to run Ninjas this hot? some people say it is, dunno.

.21A

@Mike S.

What plug do you normally use with the .12 ninja engine? Talking about temperatures about 68F - 78F