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b21 pistons in a b20??? 120-130

posted by  Phil S. on  Tue May 3 16:10 CST 2011
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last visit: Fri Oct 24 13:18 CST 2014
[RELATED]

Seat inserts go only on the exhausts -- you're not scrimping by just adding those. However, in the US market at least, 8-bolt B20s already had them fitted.

Pistons are not round, and they are not cylindrical. Measure them at 90 degrees to the wrist pins, and at the same height as the center of the pin. The cylinder bore should be somewhere in the range of .12 to .25mm larger than that dimension.

Standard B21 pistons are 92mm, and only the turbo ones have a dished top. I really don't know what you're dealing with there... In other markets, there's a 2-liter small-bore version known as the B19, but those pistons would be a very large overbore for one of those. And the 42mm intake valves are definitely unusual for a FI head.

Odd.






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