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Old 10-22-2009, 02:12 PM   #1
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Default rb s3 rod in a nova n21bf limited ???

Hi I have a new rb s3 conrod and wanted to know if it will work in my nova n21bf limited? thanks.
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Old 10-22-2009, 02:54 PM   #2
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Rb's use a slightly bigger crank pin dia. so it would be a little loose on the Nova.

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Old 10-22-2009, 03:04 PM   #3
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I don't think so but I could be wrong.

Nova rod lesson:

Nearly all Nova based .21 motors (including RB S, C and WS motors) use the R series rod, R1 through R7. They all have the same dimensions, higher numbers are just improved versions.

The exceptions:

1. I believe short stroke motors use a different rod and I believe the BF21 is one of those, not sure though as I have never had one of their short stroke versions.

2. Smaller crank pin motors. These are mainly onroad motors though I think they did try this on one of the high end offroad motors too. This would be the Collari edition and Cordoba motors (4.5mm crank pin) that use C series rods and the 353 (4mm crank pin) that uses a P series rod. These are the same length as the R rods, they just have a smaller lower rod bushing for the smaller crank pins.
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Old 10-22-2009, 05:30 PM   #4
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Up until 2 years ago, RB engines had different crank pin sizes than most all others. I think it was smaller to reduce bearing surface speed. I don't know whether or not they changed, 2 years ago was the last time I heard it mentioned.
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Old 10-22-2009, 06:20 PM   #5
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bf 21 uses a r7
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Old 10-22-2009, 06:57 PM   #6
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Quote:
Originally Posted by phoenix357 View Post
bf 21 uses a r7
If that's true, an RB S whatever rod should work just fine. I would break out the calipers and check it first just to be sure though.
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