forged crankshaft

[SQ is the SQUAD]

wow, where the hell is nate

[system-f]

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You guys are confusing me with this B series talk (differences between the B20A and B16/18 series) As someone said the B20A and it's bigger/weaker brother B21A are VERY DIFFERENT..their stroke is actually so long they tend to eat rings.(the usdm motors do, never had problem with JDM b20's rings) When I pulled apart my 89 B20A5 motor a ring landing actually fell out of #3 piston. I ordered a JDM B20A motor which did have a bit more power out of the box on high test. The B20A motor and B21A motor both do not have an open deck, their deck has bridges that tie it to the block. *Also the B20A has cast iron sleeves where the B21A does not. To sum up B20A = MUCH more rigid block than the other B series motors, but long stroke, small bore = eats rings..lots of piston travel.

Someone said the B20A head flows worse than the A20 head? not sure, I do know at 5psi of boost I had a 71% increase in Horsepower and a 70% increase in torque with no intercooler, a fuel pump that was in adequate for the job, 10degree timing retard over stock, and an unhappy intake on my JDM B20A with stock internals. Those are very VERY good power increases especially for as ghetto as my turbo setup was. I did do some port matching on the head and 'flowed' it as good as possible with a dremel tool before install, but I doubt that had little to do with the ability for the B20A's head to flow better than stock.. also I used the USDM head on the JDM B20A block rather than the JDM's head since the USDM head had just been rebuilt.
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[A20A1]

The A20 is a torque monster, at the same hp levels, the A20 will always have more torque than a B16. The reason they went to aluminum blocks insnt for strength, its for weight savings...

I also heard that having an open deck allowed for closer tolerances to be machined... and aluminum is much easier to machine then cast iron.

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[AccordEpicenter]

yeah that is very true, because cast iron is sooo hard its more difficult to machine. Ill bet that the B series engines cylinders distort much more than ours do when the head bolts are torqued down. The B21A1 engine and B20A5 arent really known to be great motors at all. The B20A is much different than B20A5/B21A1 and B20Z