V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

2.8 vs 3.1 vs fwd pistions

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Old Jun 29, 2008 | 04:51 PM
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
2.8 vs 3.1 vs fwd pistions

so i was curious to see how thick the piston tops were on the 2.8 and 3.1 pistons. the 2.8 are flat tops.while the 3.1/fwd are dished the fwd ones have almost dbl the dish depth

i dont have a fwd piston handy anyone else got on that is no good or something they can saw in half

im gonna saw one of the stock 2.8's and one of the 3.1 pistons in half tom to take a measurement but i already know the 2.8 piston has a thicker top and is also stronger in the top ring land cause of it.

ill post up the exact thicknesses tom
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