Which motor would you chose a b18 bored out or a b20. I "heard" that the b18 is lighter but better for NA and the b20 is better for turbo. Is this true?

 

B20 sleeves are supposedly the weakest of the b series bunch. I would go with a GE or darton sleeved b18 bored out to 84.5mm which results in approx. 2.0L with superior strength to the stock b20 block. Both the b18 and b20 are excellent choices for boost. The b16a is better for NA than a non-VTEC b18 or b20.

 

LS or CRV either with Golden Eagle sleeves http://www.goldeneaglemfg.com

 

all a b20 is, is a b18 bored to 84.5mm.... and yes the b20 walls are weak compared to b18 cause they are bored to 84.5mm

 

They are 84mm stock not 84.5mm

 

i say do either. what ever deal sounds better, get that one! Find the better deal ou of 2. I think both will lead the same way

 

I say b20. People say b20 sleeves are weak and I'm sure they are compared to b18 sleeves, but Trevor squeezes 100 shot dry on stock b20 sleeves and it's been holding up pretty good. This is also with skunk2 stage 1 cams.

If it could hold up 100 shot of n2o on skunk2 stage 1, I say it's strong enough to hold up most of the mild mods that you could do to your car NA. And if you're thinking about fully building the motor, it shouldn't matter, because you should resleeve it with iron ductile sleeves i.e. Golden Eagle, Darton, etc.

Jay Kim

 

Like I've said many times, B20 stock sleeves have worked fine for my friend's CRVTECs... My friend's setup is B20 bored .50mm over, JE 12.5:1 pistons, stock rods, Portflow GSR head, CTR intake cam, sprockets, RC 310cc injectors Skunk manifold, intake, JDM ITR header, ITR (P73) ECU and VAFC... His best in his all motor daily driven EK 12.62@107 That's with stock sleeves!!!