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Old 09-12-2005, 09:53 AM   #1
rayyoung05
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Default ej18 bore

will boreing out my 1.8 ltr impreza be a good idea?
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Old 09-12-2005, 01:58 PM   #2
bongchild
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sure! as i understand it, all EJ engine blocks start out as 1.8's and are then bored out to the target displacement. IF that is true, then u could potentially end up with an EJ25 guaranteed to be compatible with ur vehicle and for a fraction of the cost...
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Old 09-12-2005, 02:24 PM   #3
t3hWIT
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would that explain why the ej18 could hold so much boost considering the compression? btw, why bother upping the displacement? why not just get a bigger block/engine?
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Old 09-12-2005, 02:44 PM   #4
rayyoung05
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Default ?

i figure it would be a wiring nightmare scince its 2 differnt enginse and its front wheel drive
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Old 09-12-2005, 03:29 PM   #5
83Rabbit
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Its really not, the 2.2 can be done with minimal work and the 2.5 which I am underway in doing can be done with a minimum of just swapping connectors and sensors and spicling 4 wires for the coil.
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Old 09-12-2005, 05:17 PM   #6
bongchild
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Quote:
Originally Posted by mi_cistemz_loudr
would that explain why the ej18 could hold so much boost considering the compression? btw, why bother upping the displacement? why not just get a bigger block/engine?
Probably. The 9mm cylinder walls and forged internals have a LOT to do with it. BTW, do any of the gurus know if the EJ18 forged internals myth has been busted or cofirmed??

Last edited by bongchild; 09-12-2005 at 05:21 PM. Reason: I watch too much tv.....
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Old 09-13-2005, 08:39 AM   #7
JonofScio
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The EJ18/20/22/25 are all the same dimensions block, same size deck, just at different bores, combinations of fully closed, semi, and open deck, and between the E and 1 versions, just more or less cylinder wall. As I do believe, the last time my friend measured, his EJ18 had 13mm of wall thickness, and the last time I measured, my EJ22 had 9mm. Which does make for good math, that of the piston bore difference.

in either case, if you bored out the walls and put in cylinder sleeves, you wouldn't be able to tell the difference of the block between an EJ22 that had cylinder sleeves.

If you wanted to, the choices are limitless... You could sleeve it for 2.5L pistons, and drop a phase I crank/rod/piston setup in there, get a 2.2L manifold and heads, ect. and run with an 11.5:1 monster. who knows, it's up to you. Or you could just go get a shortblock EJ22 and drop it in.
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