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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