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OS R21 .21 1/8 On-road Motor

Old 03-08-2019, 05:29 AM
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Originally Posted by invrtd View Post
R21 Euro and R2103 based on part numbers look like the same motor. Was looking at a EURO spec to run 16% just in case I decide to run worlds.
Yeah thats what Rody said too, same more just no DLC and Black case coloring. Still waiting on mine to arrive.
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Old 03-08-2019, 07:16 AM
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Originally Posted by invrtd View Post
R21 Euro and R2103 based on part numbers look like the same motor. Was looking at a EURO spec to run 16% just in case I decide to run worlds.
Piston/liner and crankshaft are not the same, check the partnumbers.
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Old 03-08-2019, 10:18 PM
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The crankshaft and cylinder / piston port timing have changed with the “Euro” spec. In a nutshell, these changes theoretically are supposed to give it abit more top end to suit the large European tracks (hence its name).
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Old 03-09-2019, 01:22 AM
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In other words, it will fit but it will change the performance a tiny bit?
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Old 03-09-2019, 02:38 AM
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Originally Posted by Roelof View Post
In other words, it will fit but it will change the performance a tiny bit?
Correct, Euro spec a little more top speed.
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Old 03-09-2019, 03:18 PM
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I have 2 R2103, from Japan, and Im not sure if they have the 25% combustion chamber or the 16%.
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Old 03-09-2019, 06:55 PM
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Originally Posted by nitrodude View Post
I have 2 R2103, from Japan, and Im not sure if they have the 25% combustion chamber or the 16%.
https://www.osengines.com/engines-ca...020/index.html

Per their site it is setup to be compatible with 16%, although the site states to break in with 20%.
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Old 03-13-2019, 06:31 AM
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Would I be able to rebuild my 2103 with the 2103 euro p/s/r? Or would the 2103 crank cause issues with timing?
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Old 03-13-2019, 07:30 AM
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Originally Posted by Jason Smith View Post
Would I be able to rebuild my 2103 with the 2103 euro p/s/r? Or would the 2103 crank cause issues with timing?
Hi Jason,

Yes, you can, parts are compatible and no issues with the timing.
In fact the timing of the EuroSpec is the same as the 2103, it has some small mods on the liner and a lighter piston.
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Old 06-11-2019, 05:29 AM
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Hello Rody. I have a question. I see a lot of the factory drivers still using the 2103 over the Euro. Is there a reason for that you know of?

Thanks
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Old 06-11-2019, 06:07 AM
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Originally Posted by Pooh2 View Post
Hello Rody. I have a question. I see a lot of the factory drivers still using the 2103 over the Euro. Is there a reason for that you know of?

Thanks
Technically there is very little difference between the engines. Also maybe because the engines are very reliable and the factory is not giving out so many engines, they stick with what they have available.
Just a guess though
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Old 08-28-2019, 12:59 PM
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Hi, I just got myself 2 sets of R21 Euro Spec engine combos. Do I need to put shims on them if I run them on 25% nitro fuel? If so, which shim I should put on? Thanks
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Old 08-29-2019, 12:21 AM
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Originally Posted by jasoncsc View Post
Hi, I just got myself 2 sets of R21 Euro Spec engine combos. Do I need to put shims on them if I run them on 25% nitro fuel? If so, which shim I should put on? Thanks
You can use them out of the box with 25% nitro.
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Old 08-29-2019, 12:31 AM
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Thank you Rody!
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Old 08-29-2019, 07:50 AM
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Ive ran the R2103 on 25 and 16, and IMO it runs better on 16.
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