AP2 enigne?
Joined: Mar 2005
Posts: 5,946
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From: honolulu, hawaii
well from what i read which may or may not be true, the f20 c was derived from the accord's f20 by changing bore size, stroke and and using low friction and light weight parts the high rev limit was achieved plus the use of a counter balance shaft was not needed like the preludes and accords.
Registered User
Joined: Oct 2000
Posts: 15,323
Likes: 28
From: Longmont, CO
[QUOTE]TECHNOLOGY TO
INCREASE POWER
OUTPUT OF A
LOW-EMISSION/
HIGH-EFFICIENCY
ENGINE
Engineers at Honda R&D Co., Ltd.,
Tochigi, Japan [Akimoto et al.], introduced
technology employed for developing
a two-liter, inline-four engine
called F20C. The model F20C is the upscale
version of the F20B which has been the
powerplant of the Honda Accord™. The
engine was uniquely designed to produce
high specific power of 125 PS (93.2 kW) per
liter considering the limited space requirement
for the balanced weight distribution
(50 percent front and 50 percent rear) of the
S2000™ sports car. Cylinder bore was increased
from 85 to 87 mm and the stroke
was reduced from 88 to 84 mm. Because of
the 2 mm increase of the bore, both the intake
and exhaust valve diameter could be
enlarged to increase the effective flow area
by 15 percent. Engine speed was increased
from 7200 rpm to 8300 rpm to produce the
maximum power of 184 kW with the maximum
torque increased to 218 Nm at 7500
rpm. Engine mechanical friction was considerably
decreased by using lighter power
cylinder components, a roller-follower for
variable valve timing and lift electronic con-
trol (VTEC) valve train, and a cylinder block
designed for reducing windage effect and
pumping loss. At 7000 rpm, the mechanical
friction decreased by 25 percent. Intake
manifold and ports were modified to reduce
the volume in order to increase the responsiveness
of the engine by 18 percent in terms
of engine speed rise rate without affecting
the maximum power output.
While technology was developed for
increasing the maximum power, emissions
control technology was refined to meet future
emissions standards. The catalyst
INCREASE POWER
OUTPUT OF A
LOW-EMISSION/
HIGH-EFFICIENCY
ENGINE
Engineers at Honda R&D Co., Ltd.,
Tochigi, Japan [Akimoto et al.], introduced
technology employed for developing
a two-liter, inline-four engine
called F20C. The model F20C is the upscale
version of the F20B which has been the
powerplant of the Honda Accord™. The
engine was uniquely designed to produce
high specific power of 125 PS (93.2 kW) per
liter considering the limited space requirement
for the balanced weight distribution
(50 percent front and 50 percent rear) of the
S2000™ sports car. Cylinder bore was increased
from 85 to 87 mm and the stroke
was reduced from 88 to 84 mm. Because of
the 2 mm increase of the bore, both the intake
and exhaust valve diameter could be
enlarged to increase the effective flow area
by 15 percent. Engine speed was increased
from 7200 rpm to 8300 rpm to produce the
maximum power of 184 kW with the maximum
torque increased to 218 Nm at 7500
rpm. Engine mechanical friction was considerably
decreased by using lighter power
cylinder components, a roller-follower for
variable valve timing and lift electronic con-
trol (VTEC) valve train, and a cylinder block
designed for reducing windage effect and
pumping loss. At 7000 rpm, the mechanical
friction decreased by 25 percent. Intake
manifold and ports were modified to reduce
the volume in order to increase the responsiveness
of the engine by 18 percent in terms
of engine speed rise rate without affecting
the maximum power output.
While technology was developed for
increasing the maximum power, emissions
control technology was refined to meet future
emissions standards. The catalyst
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