Mugen JX21
 

is this engine strong enough for my CRT or do i need to get the .28 ninja

I just ran my new JX-21 this past weekend in my MBX5T. It has PLENTY of power for a truggy. The only reason to run the .28 motors is to bash with. They suck more fuel, are heavier and turn slower lap times at the track than the .21 motors.

is the new one better than the old one

depends where you live Tony. 21 in a heavy truggy is a struggle at high altitude.

JLINDS- Where do you live?

central texas

+1 tony i just ran one in the car sat, wow i like it alot. the new ninja is nothing like the old one. the jx motor is made by os with the new 28 block,and the crank is hardcoated.i had both grp ninja's,os vspec,jp mod vspec,p5x and im very happy with the smooth power and top end of this motor.:D

check out the July issue in RC CAR magazine, they go into detail about this engine and its an AWESOME motor for any truggy! they show detailed pics and went into detail on all the engines internals. excellent review! :D

Hey tony what pipe did you run in the 5t with this engine? i ran it on my 5r with the fast lock 2053 last saturday and it felt really good but i felt like it could use more top end.

the only pipe i have currently is the j-p3 would that be good or do i need to look for something better

The OS 2060 pipeset is whats recommended from what I have seen.

I actually ran it with the MSR1005 pipe and header. This pipe makes very good mid-top but a little softer on the bottom. I'm going up to EB Mods perhaps next week to throw the JX-21 on the X-dyno to see how she runs with a few pipes. Ed has the 2050, 2060 and his EB Mods pipe. I have the MSR1005 and Novarossi 9853. I'm also going to test it with the Innovative Designs 6mm and 7mm carb inserts.

i ran mine with the new 2042 ninja pipe which looks like a 2060 and the new short header. very smooth power with lots on top. it was killing my buddy's stock vspec with the same setup on a 5r and another's ae also with a vspec.

not sure but i think the new ninja and the os2060 share the same efra number which would suggest they are the same pipe

GOOD!! both mine just got here. :D

PIPES on JX
 

I started with JP 4 on the JX after about 5-6 tanks of break in. Had it tuned to temp right at 198-202. With this set up had lots of top end and my MBX5R was just stupid faast on top.

Then I put the Ninja (efra) 2042, which just seemed to smooth out the entire power band. I had to lean it some more because on the bottom it was 'gurgling' before taking off. Leaned it out and with the 2042, power just seems to be displaced more evenly all over, and my bottom 'gurgle' problem seems to have been solved. Bottom end is now very snappy. I am running the 2042 tonight on a very technical track.

So it seems like on a short technical type of track, go with the 2042.

On a track with more straights JP 4 seems to give more on the top side.

a

Yes, the EFRA 2042 is the OS T-2060 pipe. I have seen that in Japan, its offered with the round header or square header like the older 2050 pipeset came with. EB mods pipe is the EFRA 2041. Same as Mielke pipe or the Reckward Tuning pipeset, just not coated.

Tony , any chance you could post the dyno results , would love to see the comparisons...

Sure, after I dyno teh motor on teh different pipes I'll post the graphs just liek I did in the old GRP Ninja thread of my .21 and .28 Ninja motors.

Dyno Tests
 

Ditto that...those results would be super! Thx.

nice, sure glad you run mugens tony.

Just ordered a JX21, and I'm wondering how you guys who have come from the GRP manufactured B01/B01A's from old are finding the new motor, comparitively speaking..

I found the JX-21 to be easier to break in and get a tune on it. It has better bottom-end. GRP is a bit smoother. Run time and top end is too early to compare.

So far the JX has been a top engine here in Aus ,been able to get runtime pretty easy even on the larger tracks around the area by running 7mm restrictor and dialing the endpoint back 2mm (25% nitro) usually come in with 1/16th of a tank left :nod::nod: the thing has power every wear :D and lacks nothing to the Speeds, RB, Sirio's or Nova's
as for the B01A's i was running them until the new JX engine came out and they were a good engine but lacked bottom end power if you tryed to get run time :( i was able to get good bottom end if i ran the carby fully open and 7mm restrictor but the run time was around the 9min mark , most of the club runners are still happy to run the B01a's as the power is smooth and the tune is rock solid for the average tuner..

But i wouldn't trade my JX for anything now :nod:

Interesting stuff, thanks for the comments guys. I've been running a tuned GRP .21 for most of this year so far, but I fancied trying the JX21 after it did so well in Savoya's hands. In fairness I love my GRP, its a belting motor but your comments make me think positively so we'll see next week :D

What pipe & plugs are you running Mick? Im off the grp now, was goin to go back to the boss. What price are we looking at for a new ninja with pipe?

Andrew , running the P3 plugs and the standard JX Ninja pipe , as for price i would say they will be more than the Boss line .. The pipes are about $50 dearer than the FLS grp pipes which are one tough pipe ..

Prices just had a look at Online hobbies and the JX is $450 plus pipe , becomes a dear engine but the internal parts are some what cheaper than the GRP's , worked it out a while ago there was only $5 between them if you bought the same parts (engine,pipe,manifold,plugs,rod,clips)

Wasn't an easy decision which way to go as they are both great engines but i think the JX has a slight advantage ,only my 0.02c

Mick

What manifold are you running with the 2042? The L or the C shaped one? Whats it like to tune? Did it come with the 7mm venturi? Only 16 questions left :D

been running the "L " Manifold , it comes with a 8mm restrictor , but i have only been running the 7mm from the B01a fits fine :D No issues with tune :D

The Grp Tuned that is in my truggy has also been easy to tune as well set and forget as well :eek::eek: didn't touch the tune all weekend at the Qlds and that included the night racing as well :nod:

That wasnt my experience with mine, a fly could fart and the tune would change. I broke in another the other day and its was fine :weird: Any idea on the difference of the L & C shaped manifold.

Hi Guys
If you want an honest opinion of the JX ninja just ask Wayne Walker Mugens Australian factory driver what he thinks, he will tell you there is no comparison between the GRP ninja and the JX ninja.
The JX is easier to tune, has better run time and has more power, he normally runs the c shaped manifold.

Barry.

Hi Guys
If you want an honest opinion of the JX ninja just ask Wayne Walker Mugens Australian factory driver what he thinks, he will tell you there is no comparison between the GRP ninja and the JX ninja.
The JX is easier to tune, has better run time and has more power, he normally runs the c shaped manifold.

Barry.

Anyone used the Mugen pipes?

p@dDy

I think you need to be more specific.

http://www.mugenseiki.com/ninja-spec...r-manifold.htm

Are they good? Bad? Too expensive?

p@dDy

If they are the JX14001 & JX14002 L and C manifolds, I would assume they are the same as the L header from the 2050 OS pipeset and the C shaped from the 2060 OS pipeset. They are very durable IMO if they are the same. Use L shape for more lowend torque and C shaped for smoother power delivery. Mugen only has the EFRA 2042 pipe listed (OS 2060 pipe)

My JX21 landed today and I have to say that the first impressions are superb, typical OS manufacturing quality and internally everything looks spot on! With abit of luck I'll get her fired up and running for a few tanks tomorrow, can't wait.

Has anyone used the OS plugs on this engine?

have used OS plugs identical just different packaging :D

Since it is an OS made motor I would think OS plugs would be the best choice.

Could be wrong though since I don't have one yet.