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Old 10-01-2003, 09:25 PM   #391
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Quote:
Originally posted by Motorman
they are calling it a long stroke but stroke has not changed neither has bore.

stroke has not changed in any way. go back and look at the bore and stroke of all the previous models it has not changed just rod lengths have. go look again all the way down to the side port motors! It will be a short rod motor. That engine is Mugens new NS 12 variant. They are getting an 21 R1WC variant also soon
Dennis,

you might wanna check this engine's data once more.

This is a long stroke, not a long rod.

14.25 stroke x 13.7 bore is long stroke.
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Old 10-01-2003, 09:40 PM   #392
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Quote:
Originally posted by Motorman
That engine is Mugens new NS 12 variant.
I may be wrong but I think that's the newer NSR12 varient with the different piston material. I thought I saw the NSR engines coming with a grey carb insert...
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Old 10-01-2003, 09:47 PM   #393
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NSR come with same color carb insert as NS12S5
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Old 10-01-2003, 10:02 PM   #394
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Arrow NRS12S5

Has anyone run this motor yet? If so, how does it perform?
Does it scream but lack bottom end? Or, is this a real good motor?
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Old 10-01-2003, 10:12 PM   #395
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Quote:
Originally posted by StepPins
Has anyone run this motor yet? If so, how does it perform?
Does it scream but lack bottom end? Or, is this a real good motor?
The NSR is apparently the same as the NS12. The only difference is the material of the piston that seems to be better. I haven't seen one run yet. Just saw it physically at the LHS. The sleeve and exhaust port looks the same as the NS12. Didn't get to take out the crankshaft as the conrod got stuck pretty good.
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Old 10-01-2003, 10:23 PM   #396
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Hi InitialD!,

It's been a while Thanks for the info, I can always count on you to get answers!
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Old 10-01-2003, 10:27 PM   #397
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From my understanding haven't all the nova engines since the cx12 till the ns12 been 14.00 x 13.80?

This one by the specs has a longer stroke and smaller bore.

Also isn't any engine that has it's stroke longer then the width of the bore known as a "longstroke" or have i been smoking my pipe too long?
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Old 10-01-2003, 10:53 PM   #398
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One word. Amazing!!!!
considering my previous engine is OS 12TR, this engine have tons of torque and seem to have endless rpm. I haven't finish breaking in the engine, still running the engine on rich side but I can already tell it's a lot faster than the OS 12TR.

I gotta thanks Manticore for giving up his NSR12S5, otherwise disaster999 won't be able to deliever this beast to me as he promised.
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Old 10-01-2003, 11:52 PM   #399
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Isn't there a roar rule saying the engines need to be 14 x 13.8? If so then that engine would be illegal??
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Old 10-02-2003, 05:00 AM   #400
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Nope, there is only a rule that says the displacement can be max. 2.11 cc (0.12 cui).

How you get the is your roblem...
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Old 10-02-2003, 08:36 AM   #401
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Quote:
Originally posted by EVOLUTION
Top gun,clean out your PM inbox.
I cleaned my inbox-lately recieved so many PMs, now is clean
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Old 10-02-2003, 09:24 AM   #402
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On new engine, strock been encrease on .25 mm and diameter decrease 0.06 mm. I would concidering like no real changes were made. The square area of piston has been decrease by .88%, so down force been decrease too, but it is so low, I wouldn't realy concider it as change. (down force is pressure of burned gases multiply by area of piston). But with longer strock and ROAR, IFMAR and efra ruls of 4.5 mm exhaust windows height-it will have tighter timing on transfer and exhuast (Stefan says windows look the same). So, without modding this will be more torq and less top end, but with better milage.
It is my opinion, I might be wrong, I didn't see no one of them yet.
BTW, later activities and inputs from everybody in this thread realy make me happy. Thanks everybody and let's keep it on.
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Old 10-02-2003, 09:55 AM   #403
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As I know, in engine's world the short strock engines are called if diameterof piston is bigger them strock, if the diameter of piston smaller then strock-long strock engine and if diameter of piston equal to strock-it calls "square" ( I am not sure in english is "square" does make sence, might be different word use). So, all our on-road engines are long strock.
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Old 10-02-2003, 10:06 AM   #404
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I stand corrected they did change it some go figure. I must have had a dislexic moment when I looked at it. However the change is fairly trivial it will give it some more torque but it will be a very small amount. .25 MM is only about .010 thousanths of an inch or the thickness of a silver head shim.

Quote:
4.5 mm exhaust windows height-it will have tighter timing on transfer and exhuast
the data says the porting locations on the liner have changed so I assume they have adjusted the timing on them to get back to where they were.
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Old 10-02-2003, 10:14 AM   #405
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Quote:
Originally posted by Motorman
the data says the porting locations on the liner have changed so I assume they have adjusted the timing on them to get back to where they were.
Location of windows doesn't change timing duration. So, I still stay on assuming with 4.5mm exhaust height, it will be tight exhaust . We still need 34 to 40 deg difference between transfer and exhaust in order to pipe work properly.
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Last edited by Top Gun 777; 10-02-2003 at 11:00 AM.
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