Which is better? Does the B20 have more torque then the b18?I am ready to build for boost, and have no idea what block to go with. Any advice?

 

If you don't plan on sleeving, then run the B18 block. B20's have been boosted with mixed success on stock sleeves, but most people end up blowing them up.

 

If you are going turbo go with the B18B because their is more material around each cylinder . On the B18B the bore is 83mm and 89mm of stroke, on yhe B20 the bore is 84mm and the stroke 89mm so you wont see any difference in torque because of the same stroke.If you go with the B20, sleeve it now or you are going to have trouble very soon ...craked cylinder

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pr3B20pwr &raquo;</TD></TR><TR><TD CLASS="quote">If you are going turbo go with the B18B because their is more material around each cylinder . On the B18B the bore is 83mm and 89mm of stroke, on yhe B20 the bore is 84mm and the stroke 89mm so you wont see any difference in torque because of the same stroke.If you go with the B20, sleeve it now or you are going to have trouble very soon ...craked cylinder</TD></TR></TABLE>

Wrong, all b-series except b20 are 81mm bore. There is a difference in torque because of that.

 

b18b torque: 127 @ 5200
b20b torque: 133 @ 4300
b20z torque: 133 @ 4500

b18b compression ratio: 9.2
b20b compression ratio: 8.8
b20z compression ratio: 9.6

the b20b block is good for boosting because of the lower compression ratio.