U can try Max Power latest tuned pipe (6mm). It gives u more high end. I'm using it now with my LL5. Tips : Shorter body = high end power
Long body = torque
Good Luck bro.

Whats the difference between the Rex and Top engines. I am looking to get a new .12 engine.

Nothing. They are exactly the same

I have a MT12 turbo button and was wondering if it would fit my X12 engine with the gray head???

I think the head button off a Mugen MT12 (NovaRossi XN12 based engine) will fit into the sleeve of the rb X12 (NovaRossi RS12 based engine) due to the 2 engines having the same bore (13.80mm) but will not give the correct head clearance.
just try it and check the head clearence with a bit of solder down the plug hole.

It is not the RB it is the Mugen X12. If there is a differance. The engine sheet that came with the engine shows the turbo button part #NOV28605 and the standard button #NOV28604. Anyway to find out if this is the same one as the MT12?? The sheet also shows a bore of 13.8mm.

It will fit in the cylinder, and properly shimed will give you same compression ratio as all other Nova heads.
Problem with MT12 head button is that it is thinner than all other Nova based head buttons, and the cooling head will hit cylinder crankcase before proper sealing torque is applied to head button.

AFM

Ah that X12, I should have twigged when you mentioned the grey head.
in that case your after an NS12 head button then.
all I know is the MT12 is a long rod engine so the combustion chamber lip doesnt sink as deep into the sleeve compared to the short rod NovaRossi engine like the RS12, NS12, X12, and so on. like I said b4 the bore is the same so it will fit in the sleeve but head clearance will be diff.

why cant you just measure and see if there is any difference? that will satisfy you for sure.

[QUOTE=Hesky]........all I know is the MT12 is a long rod engine so the combustion chamber lip doesnt sink as deep into the sleeve compared to the short rod NovaRossi engine like the RS12, NS12, X12, and so on. like I said b4 the bore is the same so it will fit in the sleeve but head clearance will be diff......

QUOTE]

Because the MT12 is a long rod engine it's the sleeve that sits higher on the crankcase so the head button is thinner in able for the cooling head to sit properly. The head button will fit and and the clearance is the same as all Nova head buttons...compression will be the same...I've done it many times with different Nova based engines and also with STS engines...but you have to shave material off the bottom of the cooling head so the head button sets flush on it or the cooling head will hit the crankcase.

AFM

Ah I see, I guess I was nearly informed correctly
I asked about this a while ago on another forum and got a few contradictory answers.
thanks for straightening things out afm

For the guys running the LL3, what are your thoughts so far about this engine (good and bad)? How does ir compare to N12LS3, NSR, etc?

Also, what pipe and chassis are you running?

Hello Guys,

I write because I dont know what to do and may be some one can help me. I have a Top TS12S engine, and have run aproximatly 1.5 gallons of 20% fuel trough it. Over this time I have used two glowplugs (Novarossi 6Tc) , and everything worked great, good reliability and performance, but the when I changed the glowplug to a new one, everything went crazy.

It runs perfectly for the first time but when I turn the engine off and let it cool and try to start it again it starts ok but us soon as I take the glowplug heater off the glowplug it shuts off, and after I try to start it a few times more 4 or 5 the glow plug gets damaged. This has happenened with 3 new glowplugs.

Someone in my track said the engine has too much compression, but then why did it worked fine with the previous plugs?

If anyone has any idea what could be wrong please let me know, Im getting a little frustraded...

Tks

One correction

My engine is TS12S5 TKs

if you we're running a hot plug previously and it ran fine I cant imagen the compression is to hi. what sort of damage??

nova's r a bit temperemantel....even the change of a plug sometimes require tuning back....start again with the basic and fine tune from there....if stiill cannot, check everything back...good luck...

6C plug is good only at lower temperature and high humidity (let's say humidity higher than 60% and temp lower than 20ºC)..........

if the head clearance is too small it's shortening glowplug life (not to mention the engine as well)........

try adding a 0.10mm shim and check the engine..........you also should try 7 and 8 plugs, specially for high nitro content.........

I'm going to replace those o ring in the carburator, what is the factory defaut setting for the low speed needle? Thanks for reply

Do OS turbo plugs work OK in a Nova based engine? I've run out of cold Nova plugs and will be running in 30 degree celsius weather this weekend!!

yup, I use white metal p6 and p7 plugs on my nova based engines with no issues, I find there heat ranging very similar to that of the nova plugs. you will want to use a P8 though if conditions are that hot!!
damn you with your lovely hot weather!

Thanks Hesky
It's hitting 30 degrees Celsius (86 degrees F) and we are still in spring! It's going to be a hot summer. Have to stock up on head shims and cold glow plugs!

How will a NSR12S5 compare with NS15S5?

NSR12S5 = .12 (2,11cc), 5 port with microcast piston

NS15S5 = .15 (2,5cc) 5 port with machined piston.

i know that

i just wanna know how's the real life performance will be like?

you can expect longer life with microcasted piston...........

besides you also notice the idle speed is more stable with the microcasted piston, specially when your engine reaches temp higher than 120ºC......

performance isn't any different.......

The extra displacement will probably give the NS15 extra low down punch, I think the NS15s are good for 1.8bhp compared to 1.6 with the NSR12.

I beg to differ.

The microcasted piston will produce more power for a short time, but it will by far NOT last as along as a machined piston from NR.

From what I've read that seems to be the case. It will be interesting to see how long my new mod motors go with there mc pistons.

you must consider that the microcasted pistons work much better even with loose fitting..........

a "poor compression" standard piston simply doesn't work while a very loose microcasted piston works very well............

BTW>>> both pistons are CNC machined the same way, the difference is in the casting proccess..........microcasting allows higher silicon content in the alloy which yields better heat expasion combined with ABC contruction sleeve.........

No, they are not. The machined piston is cnc ground out of a solid piece of aluminium and the microcasted piston is casted under very high pressure and temp.

If you look at the inside of an MC piston, you'll see the surface texture of the mold, while inside the CNC piston you can see the machining marks.

All the engines with MC pistons that I or friends of mine owned made great power for about 1 Gallon and then they lost all of their grunt.

It does allow for 20-25% higher silicon content.
I noticed both my jp and rb mod motors have mc pistons with areas of the piston machine finished like the inside of the piston skirt and the piston face, I guess as accurate the micro casting process is it will never cast to desired tolerances.
I feel the micro casting process is a way of reducing manufacturing costs and manufacturing time. more of an economic solution not a performance solution.