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Port Data - Early
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Torque Settings

TUM 80 Cylinder - V1 from May 1966

 

INLET

TRANSFERS

EXHAUST

EXHAUST
BLOWDOWN

Piston Holes

-

11 mm

-

-

Gasket Holes

8 mm

-

13 mm

-

Port Diameter

8 mm

7 mm

11 mm

-

Port Height

Port Lower Edge
to
Piston Skirt (TDC)
8.9 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)

0.503 cm²

0.601 cm²

0.950 cm²

0.950 cm²

Open Duration

102.9°

93.4°

130.7°

-

Port Opens ATDC

308.6°

133.3°

114.7°

Port Closes ATDC

51.4°

226.7°

245.3°

Exhaust
Blowdown

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

18.6°

Open Time

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

6.858 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]

0.0000703 sec-cm²/cm³

0.0000763 sec-cm²/cm³

0.0001689 sec-cm²/cm³

0.0000241 sec-cm²/cm³

Time Area

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

753982 s-sq mm

901167 s-sq mm

1425498 s-sq mm

1425498 s-sq mm

Time Area

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

0.0070323 s-mm²/cc

0.0076327 s-mm²/cc

0.0168900 s-mm²/cc

0.0024082 s-mm²/cc

Angle Area

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

1.055 deg-cm²/cm³

1.145 deg-cm²/cm³

2.533 deg-cm²/cm³

0.361 deg-cm²/cm³


TUM 80A Cylinder - V2 from July 1967

 

INLET

TRANSFERS

EXHAUST

EXHAUST
BLOWDOWN

Piston Holes

-

11 mm

-

-

Gasket Holes

8 mm

-

13 mm

-

Port Diameter

8 mm

7 mm

13 mm

-

Port Height

Port Lower Edge
to
Piston Skirt (TDC)
8.9 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)

0.503 cm²

0.601 cm²

1.327 cm²

1.327 cm²

Open Duration

102.9°

93.4°

130.7°

-

Port Opens ATDC

308.6°

133.3°

114.7°

Port Closes ATDC

51.4°

226.7°

245.3°

Exhaust
Blowdown

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

18.6°

Open Time

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

6.858 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]

0.0000703 sec-cm²/cm³

0.0000763 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

753982 s-sq mm

901167 s-sq mm

1990984 s-sq mm

1990984 s-sq mm

Time Area

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

0.0070323 s-mm²/cc

0.0076327 s-mm²/cc

0.0235901 s-mm²/cc

0.0033635 s-mm²/cc

Angle Area

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

1.055 deg-cm²/cm³

1.145 deg-cm²/cm³

3.539 deg-cm²/cm³

0.505 deg-cm²/cm³


TUM 80A CM 6,5 Cylinder - V3 (Motobecane) from July 1974

 

INLET

TRANSFERS

EXHAUST

EXHAUST
BLOWDOWN

Piston Holes

-

11 mm

-

-

Gasket Holes

8 mm

-

13 mm

-

Port Diameter

8 mm

Angled Slots

13 mm

-

Port Height

Port Lower Edge
to
Piston Skirt (TDC)
11 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)

0.503 cm²

1.600 cm²

1.327 cm²

1.327 cm²

Open Duration

115.9°

93.4°

130.7°

-

Port Opens ATDC

302.0°

133.3°

114.7°

Port Closes ATDC

58.0°

226.7°

245.3°

Exhaust
Blowdown

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

18.6°

Open Time

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

7.728 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]

0.0000792 sec-cm²/cm³

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

753982 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

0.0079245 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[°]

1.189 deg-cm²/cm³

3.049 deg-cm²/cm³

3.539 deg-cm²/cm³

0.505 deg-cm²/cm³

SPEED = 2500 RPM

 

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