I never bash, just club race where JP-3 is allowed. I will try it and let you guys know how it works, I should have my mill this week, its taking forever for horizon to deliver in the states.

I got mine from apex models in the UK, had it landed in Aust in a week :)

I did a 3.5 litre break in on it and you still cant turn it over with your hand with the glowplug out :eek: :eek:

Now according to Horizon the states will not see these until may?? Anyone else here the same?

Yes, I heard the same from my LHS, who thought they were going to have them in last week. I was going to pick one up. I'm now thinking I just may pick up another C6, but this time the L2G version.

I took my grp 28 off backorder and ordered an os 28xz.
Horizon has too much history with trying to get products to market and keep pushing back the release date.
From what I have seen the engine only are scheduled to arrive on 4/5. The promo deal with engine and pipe looks like they will not be in till the end of april/early may.

If I see the engine only come into stock on the 5th, I will be surprized.

Any recent opinions from you guys that have the GRP .28? I was just at my LHS on my lunch hour and they had this mill in stock with the pipe and header for the same price A-Main is selling it for. I practically made an "Impulse" buy but managed to stop my hands from shaking and get out of the store before I could grab my wallet and do any damage.

The GRPs are both excellent engines, basically the same as the Ninja .21 and .28s, as I understand, which are excellent engines.

Does the promo kit come with the Ti coated pipe?

Matt and Quinton. The Plex has these in stock, and as usual we destroy internet pricing.:D

The promo kit i got from the UK comes with a plain aluminium 3009 pipe, not the coated one.

yea well if it works run it. it also has to do with the fact that its new. when your ninja .21 came out you did the same thing went wow thats the new better shit i wanna get that. just because drake Is a complete G and also happens to be like the fastest guy ever doesnt mean thats y were buying it. and mybe he was wearing a pink G-string that just means you just got your @ss handed to you buy a guy in a G-string im getting my losi 8ight in a couple of months and plan on throwin a GRP in it,

GRP NINJA
1 0

Hi guys,

i'm intending to get the GRP tuned .21
currently i've the Ninja 2053 FLS pipe.
would it work as well with the GRP engine?

the Ninja and GRP pipes are the same right?
(except for the titanium coating on the Ninja)

and where's the cheapest online to get the GRP engine?
thanks in advance!

lastly, not to stir s*@t here, but how wld you compare the GRP tuned to the OSspeed and the new Ninja JX21?
any comments appreciated!
i'm deciding btw these 3 engines at the moment, but leaning towards the GRP cos of the orange head..:D

Chepest I have seen is teh promo kit for $389 at www.fullthrottlehobbies.com

Well I went back to my LHS after work last night and pulled the trigger on the GRP .28 promo kit. After I saw it in person on my lunch hour, it ate at me for the rest of the day. I know there has been a lot of debate regarding the .21 vs. .28 in Truggys. I myself have never used a .28, I'm a big Picco fan and have been running the JPX .21 for a while now.
My own reasoning for jumping on the .28 bandwagon came down to (2) things.

1. I have been noticing that certain drivers at the track are finally learning how to harness the power that these .28's are capable of, and it's quite impressive. I think it's like anything new, there is always a learning curve to overcome. The curve exists for the drivers and the manufactures. Drivers are learning to handle the power while manufactures are learning to deliver a more "drivable" powerband while increasing runtimes.

2. When any industry starts to make a shift one way or another its a slow process. I'm sure this comparison has been made a thousand times, but Motocross's Two stroke to four stroke evolution is a classic example. Many riders held out riding their two stroke 250cc as long as possible, but eventually they made the switch. The industry had already shifted and the riders had to adapt. I believe this is the sort of change we will see with the .28 in the Truggy class. More manufactures will start to market their .28s as "Truggy Motors" sponsored drivers will begin run these motors and eventually the .28 will become a standard in the Truggy class.

Once again, this is just my own reasoning, who knows maybe I'll be back to my JPX.21 in a few weeks, maybe this is my own cockamamie excuse to help me feel better about forking out $450 for a new mill, but for now I'm looking forward to breaking in and learning to drive the GRP .28. Just my 255 cents.

The differences between the Ninja bo1a and MRT was the MRT was 'tuned' had a filled and counterweighted crank and ceramic bearings with a Magnesium head. The Bo1a I had was good but the MRT was awesome. A friend had the the MRT so I didn't have first hand experience comparing it back to back against the the Bo1a but did have a comparison running the Bo1a aganst the speed and V-Spec. What i can tell you is the throttle response and power of the MRT was much better then the Bo1a. However, the MRT was very finicky tuning. Much more so then the speed. Not including the MRT my engine choices would be #1 Speed, close #2 Boa1, farther behind #3 V-spec. I've got a couple of axe Cobra X1's this year so when I start runing them in a month or so i can add it to the comparison. I'd also like to get my hands on an OS Ninja engine.

From pictures on a european website it apears the crank on the GRP tuned .21 has a filled crank but is not counterweighted. The engine may still be balanced by having a lightweight piston and conrod? Too bad I'd have like to compare the MRT against the speed. I still may have a chance my LHS still has a new MRT in the show case. The only thing is parts are non-existent for the MRT and if I do find them they'll cost as much as the the whole engine and the engine alone costs $600.

the tuned crank is not weighted with a insert...

Some pics....

Some more pics...

Some More..

Last ones....

I've got 4 tanks though mine so far and no problems at all. ALOT of power even with really rich settings, can't wait to lean it out and see what it can do:D

yeah real funny when the motor actually comes off at 180. i was pitting for truhe at a rev club race and his motor was only 180 at the end of a 20 min main, and it was faster than chad's speed.

Running too cold can be just as bad as running too lean.

do t buy that running to cold is bad. I have an ops with over 15 gallons on it that has never seen 200. In fact the instructions tell you never to go over 200

So I’m in the middle of my second heat cycle and this mill definitely has a distinctive high pitch sound. It’s not to tight, but I’ve been heating the case to 220 with a heat gun prior to starting it each time. It’s gotten stuck at TDC a couple times. I just had to use the back of my screwdriver on the flywheel to get it loose again. It definitely likes to run cool. I have the head wrapped in tin foil and a sock on top of that and I’m having a hard time keeping it above 180…..

Thanks for the pics!

Hmmm, I have an MRT Ninja. Its been awhile since I had it apart but I don't recall seeing a ceramic rear bearing in mine. I'll look again.

Without opening mine up (GRP) and mic'ing out the ports, the sleeve looks "similar"...

The one thing I can see right off the bat on the crank is the side opposite of the leading edge is not "counter-weight" cut....

All in all looks like some of the MRT work has been incorporated....

Can't wait to run mine!

those engines are looking good! I know I really, really liked my B01A when I ran it in buggy...just a good all around engine for sure, and I would expect the GRP's to be more of the same

the promo kit on full throttle is showing 409.00. I am still debating getting one. I have been runing the p7r's with great luck and awsome power to boot. who knows maybe I will end up with some sooner or later

For the 2053 pipe how do you seal the quick link system? I have the 2 black o-rings but where do they go in order to seal it the best?

Guys are these GRP the same as the old Ninja?? I have read a lot that they are the same thing?? I have a .12 ninja and a .28 ninja and want to get a new engine..

THanks
Felix

Here you go.

I’ve always used Picco based motors that are known to have an extremely tight pinch. I’m on my 5th tank heat cycling. I took the engine apart, and everything looks spotless but I have one concern. I can actually turn the crankshaft full rotation by hand already on the GRP? Don’t get me wrong, it still has solid compression but compared to my JPX .21 that has about 2 gallons on it and I still can’t turn it over by hand. 5 tanks ago, when I installed the flywheel on the GRP I couldn’t crank it over by hand, but now I can.
My question is to those of you who have used anything other then Picco based engines. Does the pinch become considerably less in under a ½ gallon? If this is normal I will feel a lot better. Like I said I have had two JPX.21’s and they have been extremely tight even after a couple gallons

My Novarossi's, Axe Rossi's and OS Speed's all still had metal lock up at 1 gallon mark. The Axe Rossi has the most lock up still and still jams on the starter box when its cold out. I would check the sleeve fitment to the case. If the sleeve slides out really easy, that could be one thing. I find that most engines that have a tight sleeve to case hold the metal pinch for the longest time.

On the GRP website it shows using 2 o rings on the pipe so thats what I got on mine.

This is an interesting development. I guess those who have the MRT Ninja could offer some insight into this issue, but I'm wondering if the lack of pinch is not simply a function of the fact that the engine seems to be designed to run rather cool.

You have to give GRP credit though: the fit & finish on their mill is top notch; makes my Novarossi look crude and antiquated by comparison.

Truhe said 180 to 210 is what he runs so yeah.As long as your engine will idle while its hot and makes power pinch means nothing.

An engine is at its prime when mechanical pinch is gone, but compression is still great. (This is when at operating temp) Having mechanical pinch for too long puts more stress on the conrod than necessary.

GRP Temp..
 

The 1st night Truhe ran the GRP at Revs, it came off at 260 with an Exergen gun. I know because I pit for him, its possible he was still breaking it in a bit though. He did beat Drake that night, that was before Drake switched to GRP. The motor looks good, sounds smooth, and it seems they have increased run times. Raw power probably isnt the GRPs selling point, rather smooth power is.:nod:

those that are running this mill - how many shims are you adding for breakin with 30%?