Pretty sure the bare motor istself is the same, it's the externals as turbo, intercooler, fuel pump, infectors etc.

https://www.maverickforums.net/threads/i-am-planning-on-getting-a-2021-x3-ds-r-or-rr-is-it-worth-the-5k-extra.126247/

@skidoochris

 

I was thinking that because the RR motor is a lower compression motor with the same piston diameter, that probably the piston wouldn't have the same travel as the R.
Any other ideas short of a tear down?

 

The stroke doesn't determine compression. The combustion chamber size and piston dome/shape usually do.

 

What your worry if it a rr motor

 

I bought this as a backup motor and turns out I don't need it after all. Hopefully it is a RR motor, I'd like to know so that I can tell the next buyer exactly what it is

 

yeah you're exactly right That's what I was talking about. The head, the block, and the crank are identical to both RR and R motors, so that only leaves the pistons and the rods that make the difference . Short of all that, piston travel is the only difference

 

When you say "piston travel" you're referring to the stroke. This is not different on the two engines, they are the same displacement.

 

Beat me to it..........

 

Look up the piston and head part numbers...... I bet they are the same.

 

Why not just contact the motor builder and ask them?

 

Yeah when I was talking about piston travel I wasn't talking about overall piston travel, I was talking about the height that it goes up into the top of the block. That is the things that would affect compression ratio. The RR does not use the same rods and pistons as the R. I'm taking bets on this

 

Only way for it to "go up into" the top higher is if the stroke is longer or the head is smaller. Easy to check on partzilla for the PN for the rods and pistons.

 

Same block, same head, same crank, it's got to be either the piston or the rod.

 

This might answer some questions already asked.

https://www.maverickforums.net/threads/120hp-vs-the-rest-technical-differences.122954/

 

No such thing as a 2019 RR right? It looks like the first year of the RR is 2020.

Piston PN is the same (420893970) for a 2019 R and 2020 RR.

The rod is a different pn, rod bearing is the same.

 

Yes, there we have it, the RR has a shorter connecting rod

 

That wasn't so hard! 🤠

 

The hard part will be measuring the difference between the two motors while in the car.