207 crank vs 205

[Pandem]

Hi I have a ej205 that had a spun bearing and sent it to a machine shop, found out that it was bent 5 thousands out. I’m looking at buying a new crankshaft and can’t decide wether to get a ej205 crank or 207. It would be great if someone could tell me what’s different between the two specifically. I would like to have the ability to rev the engine decently high as a got a deal on cams/springs, want to rally cross it and would like to go to turbo the could use the extra rpm. Thank you for any advice that may be given.


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[Unabomber]

Rebuild the car and don't overthink this. If you are doing rally cross, there are classes to this. Rebuilding the motor changes your class which will affect your standing. And the part where you say, "would like to go to turbo the could use the extra rpm" leads me to believe English is your second language or you have a fundamental misunderstanding of how engines work. A different crank or turbo will not magically give you extra RPM.

Moving to a better forum in case there are legit reasons to swap cranks I'm ignorant of.

[K3rm1tth3fr0g]

The 207 crank is better and has more drilled holes for oiling + 8k balancing

Micah at 3MI (homemadeWRX) confirmed they are different in this thread after initially positing they were identical

[Pandem]

Originally Posted by Unabomber

Rebuild the car and don't overthink this. If you are doing rally cross, there are classes to this. Rebuilding the motor changes your class which will affect your standing. And the part where you say, "would like to go to turbo the could use the extra rpm" leads me to believe English is your second language or you have a fundamental misunderstanding of how engines work. A different crank or turbo will not magically give you extra RPM.



Moving to a better forum in case there are legit reasons to swap cranks I'm ignorant of.

Well no. Eventually ide like to go to a turbo that’s power band is higher and we’re I’m still in my power band around 7500-8k. For my local rally cross at grassroots level it purely 2wd and 4wd/awd classes. Sorry I just didn’t word that very well and English is my first language just not very good at it.


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[Pandem]

Originally Posted by K3rm1tth3fr0g

The 207 crank is better and has more drilled holes for oiling + 8k balancing

Micah at 3MI (homemadeWRX) confirmed they are different in this thread after initially positing they were identical

Ok thank you I had looked at thread that but it lead me two more questions… where is the 205 crank balanced too and is the balance the same on all 207 cranks or do you have to be picky on which one you get


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[D-Rodman]

I believe it is the ver 8 onward ej207 that received oiling improvements.


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[Pandem]

Originally Posted by D-Rodman

I believe it is the ver 8 onward ej207 that received oiling improvements.


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Ok sweet. Thank you


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[epicdonut]

From what I know the 207 Crank is better for RPM and is better balanced. Had a 207 in my bugeye and I loved how much RPM it had

[Pandem]

Originally Posted by epicdonut

From what I know the 207 Crank is better for RPM and is better balanced. Had a 207 in my bugeye and I loved how much RPM it had

Just bought one hopefully it goes well


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[Homemade WRX]

Originally Posted by K3rm1tth3fr0g

The 207 crank is better and has more drilled holes for oiling + 8k balancing

Micah at 3MI (homemadeWRX) confirmed they are different in this thread after initially positing they were identical

So saving some headache, they're the same base crank if you order the EJ205 crank ending in 240. Then the EJ207 got nitriding, which you can do with your EJ205 crank for far less than an EJ207 crank will cost you.

I also recommend everyone doing a build to have a machine shop balance their bottom end if they don't have the means to do it themselves. What passes as good enough for Subaru is pretty scary to motorsports oriented me.

[Pandem]

Originally Posted by Homemade WRX

So saving some headache, they're the same base crank if you order the EJ205 crank ending in 240. Then the EJ207 got nitriding, which you can do with your EJ205 crank for far less than an EJ207 crank will cost you.

I also recommend everyone doing a build to have a machine shop balance their bottom end if they don't have the means to do it themselves. What passes as good enough for Subaru is pretty scary to motorsports oriented me.

Oh darn would have been nice to now that before buying the 207 crank… although side by side the cranks do seem to have some differences, mainly the oil holes, there’s double on the 207 and it’s noticeable the finish on the 207 crank is much smoother.


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[K3rm1tth3fr0g]

That's likely because your OG crank's PN doesn't end with 240.

[Homemade WRX]

^^^What he said.

Originally Posted by Pandem

Oh darn would have been nice to now that before buying the 207 crank… although side by side the cranks do seem to have some differences, mainly the oil holes, there’s double on the 207 and it’s noticeable the finish on the 207 crank is much smoother.

They changed to the dual main drilling (and altered timing 45 degrees too) on the newer EJ205 cranks. See the -240 part number comment.

Closest pic of this that I know of is HERE

This is a -240 EJ205 crank with the ion nitriding I used to offer them with.

[ForestHer]

would the crank of the 257 be better than 207?

[FuJi K]

Originally Posted by ForestHer

would the crank of the 257 be better than 207?

They die the same. Keep the motor from detonation and running lean, they'll live.

Btw, 79mm crank does 9000rpms just fine.