6 Cylinder Head Specs


FACTORY QUOTED
THEORETICAL COMPRESSION RATIOS:

MODEL

ENGINE #

C-Ratio

ENGINE # SUFFIX

2000 Mk1
To
MB 13750E

8.5:1
HE

2000 Mk1
From
MB 13751E
9:1
or 9.1:1
HE

2000 Mk1
MB 7:1 LE

2000 Mk2
To
ME 50 000

9.25:1
HE

2000 Mk2
To
ME 50 000
7:1 HE

2000 Mk2
From
ME 50 000

8.8:1
HE
2.5
PI + TR5/6
All
MG, CP, CR

9.5:1
HE

2500 TC + S
MM
8.5:1
HE
HE
denotes high compression engine unit

LE denotes low compression engine unit

DIFF RATIOS FOR TRIUMPH
SALOONS:

MODEL

DIFF RATIO

Mk1 PI

3.45

Mk1 manual

4.1

Mk1 automatic

3.7

Mk2 2000

3.7

Mk2 2500 & PI

3.45

DISTRIBUTOR MODELS &
MAX ADVANCE FIGURES FOR TRIUMPH SALOONS:

(rpm quoted is distributor not crankshaft)

Model

From engine #

Distributor

Part #

Max advance
2000
Mk1
high
compression

Lucas 25D6

Lucas 40967

11-13 degrees @2100rpm
low
compression

Lucas 40975
15
degrees @2500rpm
2.5
PI Mk1

Lucas 25D6

Lucas 41236
11
degrees @3000rpm
2000
Mk2
ME1
Lucas 25D6

Lucas 41314
13
degrees @2500rpm

ME50001

Lucas 25D6

Lucas 41378
9
degrees @1800rpm

ME92301

Lucas 45D6

Lucas 41452
9
degrees @1800rpm

ML20001

Lucas 45D6

Lucas 41621
11
degrees @2300rpm
2.5
PI Mk2
MG1
Lucas 25D6

Lucas 41236
11
degrees @3000rpm

MG75001

Lucas 25D6

Lucas 41502
13.5
degrees @1400rpm

MG82007

Lucas 25D6

Lucas 41543
13
degrees @1500rpm

MG83620

Lucas 43D6

Lucas 41582
13
degrees @1500rpm
2500
TC
Pre
’74 engines (overseas)

Lucas 25D6
14
degrees @2300rpm
MM45
Lucas 45D6

Lucas 41536
10
degrees@1400rpm

MM20001

Lucas 45D6

Lucas 41624
7
degrees @1400rpm

Australian market

Lucas 45D6
Part
#41654
11
degrees @2000rpm

BHP & TORQUE FIGURES FOR
TRIUMPH SIX CYLINDER ENGINES:

MODEL

BHP @ RPM

TORQUE @
RPM

TR5

150 @5500

164 @3500

TR250

104 @4500

143 @3000

TR6 (69-72)

*see TR5

*see TR5

TR6 (73…)

124 @5000

143 @3500

TR6 (USA)

*see TR250

*see TR250

Herald Vitesse 1600

70 @5000

92 @2800

Vitesse 2L

95 @5000

117 @3000

Vitesse Mk2

104 @5300

117 @3000

2000 Mk1

90 @5000

117 @2900

2.5 PI Mk1 & Mk2

132 @5500

153 @2000

2000 Mk2

84 @5000

100 @2900

2000 TC

91 @4750

110 @3300

2500 Mk2

99 @4700

133 @3000

2500 TC

106 @4700

139 @3000

GT6 Mk1

95 @5000

117 @3000

GT6 Mk2

104 @5300

117 @3000

GT6 Plus (USA)

95 @4700

117 @3400

Source: “Triumph Cars, The Complete Story” by
Robson
and Langworth

TRIUMPH SIX CYLINDER ENGINES Cylinder head
applications chart

Part # (bare)

Head # (stamped)

Casting # (raised)

Height nominal (inches)

Applications

Piston type

Exhaust valve

(mm)

Push rod length (inches)

EGR hump

Rear water slot

516323?

516323
?
3.535

TR250
flat 32.0 8
5/16
yes ?

516799

516816

308351

3.400

Mk1 PI & Mk2 PI to MG50000. 2000 low compression 7:1.


TR5/6 to CR 2845
flat 32.0 8
1/8
no yes

517610

517528

308351

3.300
Mk2
2000 to ME50000, Mk2 Vitesse/GT6
flat 32.0 8
yes
(squared)
?

517610

517610

308351

3.300
As
above
flat 32.0 8
no
?
yes

520819

218225

312388

3.400
Mk2
2000 from ME50001 to ME86355-86508, Mk2 GT6
dome 32.0 8
1/8
yes no

520821
?
312388

3.400
Mk2
2000 from ME50001 Police Cars
dome 32.0 8
1/8
yes no

520873

218225

312388

3.400
Mk2
PI MG50001 to MG82077
flat 32.0 8
1/8
yes no

520879

218226

312538

3.475
2500
TC & S (Australia ’73)
flat 32.0 8
5/16
no
?
?

?

218226

312388

3.475
2500
TC & S (Australia ’74)
flat 32.0 8
5/16
yes ?

520870?

218227

313247

3.535
TR6
Carb (Africa?)

7.5:1 comp

flat 32.0 ? yes
(squared)
no

?

219015

313248

3.400
Mk2
2000 from ME86355-86508, continuously from ME91075. Mk2 PI from
MG82077. TR6 PI from CR2936. GT6 Mk3

2000: dome


2500: flat

30.3 8
1/8
yes no

520879

219016

313248

3.475
2500
TC & S MM1 onwards
flat 30.3 8
5/16
yes no

RTC2225

219021

313248

3.475
2500
TC & S (Australia)
flat 30.3

(inserted)
8
5/16
yes
(used)
no
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