O.S. Making new ninja engines - Chitown R/C - Chicago's Largest RC Car and Truck Community

cheesecake · (#1 (**permalink**))

Quote:

After the exclusive news about the Mugen/GRP split, we are pleased to publish detailed pictures of the JX21-B01 engine and various parts. Click 'Read More' to view them.

The engine, OEM manufactured by OS engines for Ninja, is loosely based on their V-Spec with some custom features: the crankcase is from the OS 28XZ engine and does not feature the distinctive OS 'black' coating, the sleeve port design is a bit different from the V-Spec, head design, the crankshaft appears to have the same 'DLC' coating as the OS Speed V-spec but without counterweights. All in all a mix up of a few OS engines and Ninja branding.

J-Dub · (#2 (**permalink**))

OS does rock. Haha

Whats the point of putting a .21 in a .28 Crank-case.

briyouu · (#3 (**permalink**))

bigger crank bearings

J-Dub · (#4 (**permalink**))

Ahh, Never really thought of that. Wonder how it runs.

Casketman · (#5 (**permalink**))

Like junk

blktransam · (#6 (**permalink**))

stupid....

chickenfarmer3 · (#7 (**permalink**))

That is gonna be a good motor.

slaytanic · (#8 (**permalink**))

I agree. It will be a good motor but I bet overpriced! The head looks fragile. Wonder if it will have the legendary OS reliability and ease of tune?

J-Dub · (#9 (**permalink**))

I would think with the oversized crankshaft bearings you're gonna get something a bit more reliable, more support for the crank less vibrations or something. I wouldnt really call it a breakthrough but it definatly has some good logic.

rocco79 · (#10 (**permalink**))

Uhhhhh.... Who said .28's have bigger crank bearings?????

J-Dub · (#11 (**permalink**))

*shrug* Some guy. Never took one apart like i know. :-D

rocco79 · (#12 (**permalink**))

Ok... well a .28 only has a larger bore and MAYBE a slightly longer stroke. T.... The case is no bigger, i mean C'mon how would you bolt it in if it was? if anything it may be .1 or .2 mm bigger but wheres the advantage in that?. i would think the advantage would be a thicker sleevve making the motor more durable and then being able to take advantage of the new porting in the .28

J-Dub · (#13 (**permalink**))

Yeah...some guy in the beginning said that.

Would you want a longer stroke, or a bigger bore...longer stroke has more torque doesnt it, bigger bore short stroke gives you more top end right?

If I remember this from engines class in college hah

chickenfarmer3 · (#14 (**permalink**))

pretty sure its the other way around, the long stroke allows for more rpm's on top, and the bigger bore gives more down low....I THINK

J-Dub · (#15 (**permalink**))

yeah I cant remember from engines class. Makes sense a short stroke will bring you to RPM more quickly but i think longer stroke gives you more torqeu. Who knows they are all mostly fast anyway, unless its like a 90 buck engine.

slaytanic · (#16 (**permalink**))

Shorter Stroke=Higher possible RPM's