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Old 08-05-2017, 10:25 AM   #1
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Default 2017 OS Speed R2103 3.5cc Nitro On Road Engine

Features a newly designed crankshaft and a new piston and liner. Compared to the R2102 engine the R2103 will offer more low to mid-range torque and this is why the engine comes with a standard steel main bearing as these are meant to further improve torque characteristics.

This time may leave the bearing the same as previous, and what else?
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2017 OS Speed R2103 3.5cc Nitro On Road Engine-osspeedr2103.jpg  
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Old 08-05-2017, 12:12 PM   #2
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So as I say... commercial bulsh*t.

But I do find it a positive thing that a manufacturer dares to say the steel bearing is the right one, ceramics are so over rated. And what is a new designed crakshaft? If you put it next to one of a 2102 it will probably look the same. But the extra low/mid torque says there is something done with the timings
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Old 08-05-2017, 01:25 PM   #3
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They may also trying to be more price competitive, ceramics cost a bunch more and their engines are already expensive. Novarossi can be had for over $100 less than their product and with ceramics installed.
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Old 08-05-2017, 02:59 PM   #4
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Have a look at some of the videos of the track for this WC. It is all bottom end, and the manufacturers (OS and Picco) have done some timing adjustments to suit.
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Old 08-05-2017, 04:46 PM   #5
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Quote:
Originally Posted by Roelof View Post
So as I say... commercial bulsh*t.
Im with Roelof on this... seems to me that OS is trying to keep a fresh image. Dont get me wrong i love OS and thats what I run in on-road and off-road. But so many other manufacturers are rebadging Offroad OS mills with perhaps a few tweaks... Then OS drops a "new mill" which is not all that different than the predessesors...
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Old 08-06-2017, 04:09 AM   #6
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This new R2103 will continue with 7 ports or will be an evolution to a 9 ports.
7 + 1 or 9 + 1?
7 + 3 or 9 + 3?
3 exhaust ports or only 1 exhaust ports?
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Old 08-06-2017, 11:56 PM   #7
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curious why no sponsorsed driver testing in US or Eurpoe?
The engine was publicly announced.
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Old 08-07-2017, 01:29 AM   #8
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A pre-world was driven so I asume someone had tested different timed 2102 engines to determ what is right for the 2103 model.
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Old 08-07-2017, 09:44 AM   #9
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O.S.SPEED R2103
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Old 08-08-2017, 07:22 AM   #10
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Nah, I'll stick to Novarossi. At least I know my engine will always make a 5 minute qualifier Gotta admire their marketing though...
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Old 08-08-2017, 11:33 AM   #11
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Nah, I'll stick to Novarossi. At least I know my engine will always make a 5 minute qualifier Gotta admire their marketing though...
Is your NOVAROSSI 7 or 9 port?
Mito Engine?
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Old 08-14-2017, 11:14 AM   #12
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Nah, I'll stick to Novarossi. At least I know my engine will always make a 5 minute qualifier Gotta admire their marketing though...
yeap..novarossi for me too..

OS is great when its new and needs a lot of TLC..i've had a few that loses its compression after couple of races..
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Old 08-14-2017, 12:37 PM   #13
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Is your NOVAROSSI 7 or 9 port?
Mito Engine?
Ielasi Tuned Novarossi which is based on the 9-port Mito WC. Easy 5:30 with this engine. My buddy has the Mito WC and gets comparable milage.
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Old 08-14-2017, 12:38 PM   #14
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yeap..novarossi for me too..

OS is great when its new and needs a lot of TLC..i've had a few that loses its compression after couple of races..
Yes. Much like Picco too. Both very fast when new but quickly drop off.
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Old 08-15-2017, 12:00 AM   #15
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Yes. Much like Picco too. Both very fast when new but quickly drop off.
I had 15 os motors since the black heads ones came out and never not one ever lost a drop of compression!!! one motor had 18 gallons and the lap times were identical from gallon 1 to 18 and only used 4 rods it was insane!!
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