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Old 10-17-2003, 11:08 PM   #1
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Default RS12T5S1 vs NSR12S5

I am trying to compare the difference bet the RS12 and NSR12 to see why the NSR12 is rated higher and is faster.....
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Old 10-17-2003, 11:12 PM   #2
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more....
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Old 10-17-2003, 11:15 PM   #3
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side to side comparison
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Old 10-17-2003, 11:16 PM   #4
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again side to side comparison
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Old 10-17-2003, 11:21 PM   #5
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dismantle engines
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Old 10-17-2003, 11:23 PM   #6
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piston comparison
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Old 10-17-2003, 11:25 PM   #7
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another piston comparison
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Old 10-17-2003, 11:39 PM   #8
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My comments on the new NSR12:

Quality wise, there were a couple of dink and scratched on the carb as compared to my RS12. Seem like the items are maybe chuck into a pool of carbs that cause the dinks and scratches, no big deal but my RS12 is clean of such thing. No big deal though. The most noticable quality difference is when I tried to move the throttle but the LSN is not align properly to enter the spary bar. Again my RS12 never had such an issue. I had to take the car apart to redo the LSN alignment and after several tried, it move in and our perfectly. The other parts of the engine is assemble well. I particularly like the laser marking of the NSR12!.



Part comparison.
After removing and comparing the parts with RS12 I notice the major difference is the crankshaft(of course!), carb and piston. The sleeve is exactly the same as the RS12. What make is faster and better then? I examined the carb careful and notice the the main difference other than the carb restrictor is the LSN needle, The RS needle is less tapered as compared to NSR12. The RS needle is thicker at the base and gradually becomes smaller at the end that goes in the spray bar. NSR12 LSN needle is more angled esp. at the tip. The tip is kinda sharp design and is thicker nearer to the base. I guess this contributes to the increase in low end torque production and quicker response.

The other noticable difference is the piston. The RS12 has 2 oil groove while the NSR has 1. Even the construction looks different. I am not a Metallurgist so I cant tell what exactly is that material. I guess this might make a difference but not much in terms of performance. 1 oil ring may reduce the drag in the chamber.

Anyone have any comments on the NSR?
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Old 10-18-2003, 06:16 AM   #9
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the engines I've seen are marked NS12..Tower,and trinity only list that engine..what version the the NSR12?..

http://www2.towerhobbies.com/cgi-bin...=++&search3=Go
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Old 10-18-2003, 06:26 AM   #10
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Quote:
Originally posted by fastharry
the engines I've seen are marked NS12..Tower,and trinity only list that engine..what version the the NSR12?..

http://www2.towerhobbies.com/cgi-bin...=++&search3=Go
The NSR is suppose to be the improved version of the NS. The NSR comes with a supposely new micro cast piston which suppose to be more heat resistance than the NS piston. I have yet to run this as this is my spare engine.
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Old 10-18-2003, 04:30 PM   #11
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Quote:
Originally posted by spawn
The NSR is suppose to be the improved version of the NS. The NSR comes with a supposely new micro cast piston which suppose to be more heat resistance than the NS piston. I have yet to run this as this is my spare engine.


The same as the salven engine....I called trinity,they know nothing about it(there's a shock )...

Seen one for sale anywhere?..
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Old 10-18-2003, 10:52 PM   #12
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Quote:
Originally posted by fastharry
The same as the salven engine....I called trinity,they know nothing about it(there's a shock )...

Seen one for sale anywhere?..
I believe most LHS will not stock these modified engines, I know someone has one MS (I think). You probably have to order the engine as they are rare and hard to come by unlike Rody tuned RBs.
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Old 10-19-2003, 06:59 AM   #13
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So if trinity imports Nova motors,and they are not on Novas web site,where are thy available from,even as a distributor?..
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Old 10-19-2003, 11:44 PM   #14
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I got mine NSR12S5 from Hong Kong about 2 months ago. The thing was incredibly tight to break in. The guy in the shop said only the Fantini one was quicker.

Just waiting for a sunny day and a alchohol free friday night to see what sort of power its got.
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Old 10-20-2003, 03:42 AM   #15
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Quote:
Originally posted by spawn
The most noticable quality difference is when I tried to move the throttle but the LSN is not align properly to enter the spary bar. Again my RS12 never had such an issue. I had to take the car apart to redo the LSN alignment and after several tried, it move in and our perfectly. The other parts of the engine is assemble well. I particularly like the laser marking of the NSR12!.
Oooophs, a little bit late. Missed this post of yours...

Glad it worked well for you. So the question now is when it it going to be run in or which car is this engine going to find home...

Quote:
Originally posted by spawn
The RS needle is less tapered as compared to NSR12. The RS needle is thicker at the base and gradually becomes smaller at the end that goes in the spray bar. NSR12 LSN needle is more angled esp. at the tip. The tip is kinda sharp design and is thicker nearer to the base. I guess this contributes to the increase in low end torque production and quicker response.
Cool info spawn. Thanks. Did you check the spray bars to see if they are the same diameter? Perhaps if you're daring and adventurous enough, put the low speed needle of the NSR into your RS and see what happens...

Did you check the dimensions of the sleeve ports to see if there is any difference? Any difference on the exhaust port height? What about the crankshaft intake window? The opening width different? The most ideal it to put both of these engines on a degree turning wheel to locate the differences in their opening, exhaust, induction etc.
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