4/3/2009
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Company: Diamond Pistons
www.DiamondRacing.net
Diamond's New Series of Domed Pistons for 302/351 Windsor Engines
Available for wide range of bore and stroke combinations.
Diamond Pistons has released a new Dome series piston designed to
suit Windsor 302 and 351 (4.9L/5.7L), Ford’s venerable
90-degree small-block engines that succeeded the Y-block and served valiantly
for over thirty years from 1962 to the mid-nineties.
These pistons are intended for oval
track racers as well as the Sportsman, Weekend Warrior, and Bracket
racers. In fact, any Windsor application using fuel with an octane
rating in excess of 108 and compression ratios of between 11.5:1 and
14.8:1 will benefit.
This new piston series is not
confined to a few popular sizes, but instead embraces a vast range of
new part numbers. For the 302 engine with original valve arrangement,
the Diamond Dome series caters to the OEM standard bore (4 inch), and
extends to .060˝ overbore. In stroke lengths, they accommodate the
OEM standard configuration (3.00˝ with a 5.09˝ rod) and the
longer 3.250˝ stroke as well as the 3.400˝ stroke, both of
which use a 5.40˝ rod, providing desirable displacements for the
331 and 347 c.i.d. proponents.
Of course the range of stroker
crankshafts for the 351 Windsor is greater still. Diamond domes are
available for the OEM standard stroke (3.50˝ with 5.956˝ rod)
and extend to 4.250˝ stroke lengths. Diamond also offers a big bore
4.125-inch piston for the latest Ford Racing blocks and also Dart
blocks.
Though not suited for use in blown
or turbocharged engines (because of compression ratios), these premium
forged pistons, which are made from 2618 alloy, have the top ring
placed sufficiently far down from the piston crown to permit a hefty
shot of nitrous.
To dissipate unwanted pressure
residing between the first and second rings, a pressure-balance groove
is provided. This thin v-shaped channel acts as a reservoir; thus it
prevents excess pressure from unloading the ring, breaching the ring
seal, and losing power.
The pistons are supplied with wrist
pins (H13 Tool Steel, coated or uncoated), spiral locks, and a
conventional ring stack: 1/16˝ (top ring), 1/16˝ (second ring),
and 3/16˝ (oil-control rings). For naturally aspirated engines, a
Total Seal Plasma Moly top ring would be supplied. To contend with the
higher temperatures and pressures of nitrous oxide, Total Seal’s AP
stainless steel top ring with its CrN (chrome nitride) anti-friction
face coating would be allocated.
On the longer stroke models where
the wrist pin bore intersects the oil control ring groove, oil control
ring support rails are supplied. To lubricate the wrist pins, double
oiling ports in each wrist pin bore are added.
Diamond Dome series pistons for Ford Windsor engines are available in 5-7 working days.
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