Displacement variations....

["Storhok, Eric (E.M.)" <estorhok@domain.elided>]

With a little spreadsheet work, here are some interesting combinations:

For a 1.5l engine (good for land speed records):
2.0l pistons+ GTA jr crank (84x67.5) = 1496 cc
1750 pistons and a 1300 crank (80x75) = 1507 cc
nice and oversquare

how about 1600..... (isn't there a vintage break point here?)
1750 pistons+1600 crank = 1648cc (may have to make it a little smaller
2.0l pistons+1300 crank = 1662cc (ditto)

And our friend, the 1800...
2.0l pistons+ 1600 crank = 1817cc

There are some interesting undersquare options, too:
1300 pistons on a 2.0l crank (74x88.5) = 1522 cc
1300 pistons on a 1750 crank (74x82) = 1410
and 1600 pistons on a 2.0l crank (78x88.5) = 1691 cc

The last one is interesting as 1700cc was the bogey for an early IMSA sedan series motor.  But instead of this combination, Don de-stroked a 88mm crank to 84.5 and used 1750 pistons for 80x84.5=1698.97 cc.  This was the infamous Giulia TI Talladega.

My current eye has a GTA Jr crank (67.5) with a 68.5mm bore, which comes out to 995cc, perfect for the 1.0l land speed record class....  See why I'd like to find one of those 80's 1300 Giuliettas?

Eric Storhok
Core Emissions and Fuel Economy Team
Advanced Powertrain Engineering
(313)33x75011
MD 35, FPC-B
Ford Motor Company

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