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Port Data - Later
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TUM M 80A CM 6,5 Cylinder - V4 (MBK) from March 1986

 

INLET

TRANSFERS

EXHAUST

EXHAUST
BLOWDOWN

Piston Holes

-

11 mm

-

-

Gasket Holes

9 mm

-

13 mm

-

Port Diameter

9 mm

Angled Slots

13 mm

-

Port Height

Port Lower Edge
to
Piston Skirt (TDC)
14 mm

Port Upper Edge
to
Liner Top Edge
34.9 mm

Port Upper Edge
to
Piston Crown (TDC)
30.2 mm

-

Port Total Effective
Area (TE.Area)

0.636 cm²

1.600 cm²

1.327 cm²

1.327 cm²

Open Duration

133.9°

93.4°

130.7°

-

Port Opens ATDC

293.3°

133.3°

114.7°

Port Closes ATDC

66.7°

226.7°

245.3°

Exhaust
Blowdown

EB = Transfer Port Open[°] TO Exhaust Port Open[°]

18.6°

Open Time

Open Time = Open Duration[°] / RPM / 6

8.900 mS every 24 mS

6.227 mS every 24 mS

8.712 ms every 24 mS

1.242 mS every 24 mS

Time Area

Time Area = Effective Area[cm²] / cc * Open Time[S]

0.0001155 sec-cm²/cm

0.0002033 sec-cm²/cm³

0.0002359 sec-cm²/cm³

0.0000336 sec-cm²/cm³

Time Area

Time Area = Open Duration[°] / Open Time[S] * Effective Area[cm²] * 100

954259 s-sq mm

2400000 s-sq mm

1990984 s-sq mm

1990984 s-sq mm

Time Area

Time Area = Effective Area[cm²] / cc * Open Time[S] * 100

0.0115505 s-mm²/cc

0.0203274 s-mm²/cc

0.0235901 s-mm²/cc

0.0033635 s-mm²/cc

Angle Area

Angle Area = Effective Area[cm²] / cc * Open Duration[°]

1.733 deg-cm²/cm³

3.049 deg-cm²/cm³

3.539 deg-cm²/cm³

0.505 deg-cm²/cm³


TUM M 80A CM 6,5 Cylinder - V4 (MBK) from March 1986 (Tuned)

 

INLET

TRANSFERS

EXHAUST

EXHAUST
BLOWDOWN

Piston Holes

-

11 mm

-

-

Gasket Holes

9 mm

-

13 mm

-

Port Diameter

9 mm

Angled Slots

15 mm wide

-

Port Height

Port Lower Edge
to
Piston Skirt
Cutaway (TDC)
13 mm

Port Upper Edge
to
Liner Top Edge
34.9 mm

Port Upper Edge
to
Piston Crown (TDC)
29.2 mm

-

Port Total Effective
Area (TE.Area)

0.636 cm²

1.600 cm²

1.327 cm²

1.327 cm²

Open Duration

133.9°

93.4°

137.5°

-

Port Opens ATDC

293.3°

133.3°

111.2°

Port Closes ATDC

66.7°

226.7°

248.8°

Exhaust
Blowdown

EB = Transfer Port Open[°] TO Exhaust Port Open[°]

22.0°

Open Time

Open Time = Open Duration[°] / RPM / 6

8.900 mS every 24 mS

6.227 mS every 24 mS

9.167 ms every 24 mS

1.470 mS every 24 mS

Time Area

Time Area = Effective Area[cm²] / cc * Open Time[S]

0.0001155 sec-cm²/cm

0.0002033 sec-cm²/cm³

0.0002482 sec-cm²/cm³

0.0000398 sec-cm²/cm³

Time Area

Time Area = Open Duration[°] / Open Time[S] * Effective Area[cm²] * 100

954259 s-sq mm

2400000 s-sq mm

1990984 s-sq mm

1990984 s-sq mm

Time Area

Time Area = Effective Area[cm²] / cc * Open Time[S] * 100

0.0115505 s-mm²/cc

0.0203274 s-mm²/cc

0.0248227 s-mm²/cc

0.0039798 s-mm²/cc

Angle Area

Angle Area = Effective Area[cm²] / cc * Open Duration[°]

1.733 deg-cm²/cm³

3.049 deg-cm²/cm³

3.723 deg-cm²/cm³

0.597 deg-cm²/cm³

SPEED = 2500 RPM

 

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