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ej18 upgrade. better pistons?


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29 replies to this topic

#26 86BRATMAN

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Posted 21 May 2013 - 09:38 AM

Thanks for the correction.  Now you have me thinking about that combination.



#27 Gloyale

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Posted 21 May 2013 - 09:39 AM

Double post



#28 86BRATMAN

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Posted 21 May 2013 - 11:41 AM

Rods are the same.

 

Crank is different.  Shorter stroke in the 18.

 

Interestingly though,  EJ18 and NA EJ20 share same piston size.....hmmmm???

 

And Also,

NA EJ20 and EJ22 share cranks (same stroke)......Hmmmm? 

 

MAybe a 2.2 crank w/ NA 2.0 pistons in the EJ18 block?  I guess you could just get a JDM NA 2.0 at that point :rolleyes:

I did some looking around after you posted this.

 

Everything I see says the ej18 is 3.46x2.95 (87.9x75mm) and the ej20 is 3.62x2.95 (92x75mm)



#29 johnceggleston

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Posted 21 May 2013 - 04:55 PM

Rods are the same.

 

Crank is different.  Shorter stroke in the 18.

 

Interestingly though,  EJ18 and NA EJ20 share same piston size.....hmmmm???

 

And Also,

NA EJ20 and EJ22 share cranks (same stroke)......Hmmmm? 

 

MAybe a 2.2 crank w/ NA 2.0 pistons in the EJ18 block?  I guess you could just get a JDM NA 2.0 at that point :rolleyes:

 it is not often i correct knowledgeable folks here, but,  i think you may be mistaken or confused.

 

links below for the impreza ej18 and the impreza je22  crankshafts, item # 2 in each diagram. both use the 12200AA042 crank.

 

ej18 - http://opposedforces...and_crankshaft/

ej22 - http://opposedforces...illustration_1/

 

so while i'm not saying you are wrong, i am saying there is evidence that the cranks are the same.

 

ej18 and ej 22 use the same cranks and rods.

ej18 and ej20 use the same pistons. crank must be different.



#30 Gloyale

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Posted 22 May 2013 - 10:09 AM

 it is not often i correct knowledgeable folks here, but,  i think you may be mistaken or confused.

 

I believe I was mistaken.  My bad.

 

The cranks are all the same.  EJ18,EJ20,EJ22

 

The pistons are different.

 

I think I was thinking about EA81/82 pistons sharing bore size with the EJ20.  Which they do...92mm






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