ssutton@ban.chinalake.navy.mil writes:
> Does anyone out there in Triumph-land have the camshaft timing specifications
> for a '74 1/2 TR-6 (Engine # CF28236UE); i believe this has the 'later' spec
> camshaft. Specifically I am looking for the following:
>
> Inlet opens xx BTDC Inlet closes xx ABDC
> Exhaust opens xx BBDC Exhaust closes xx ATDC
> Lift at vavle .xxx"
>
> All my reference material shows specifications for the Triumph competition
> cams (S-2, S-4, etc) but no info on the stock cam.
>
> Thanks in advance.
>
> Steve Sutton
> Ridgecrest, CA
Cam Details for 2500cc Triumph Engine
=====================================
All specifications from G. Thomas's Tuning Manual for Standard Triumph
Cars between 1959 and 1980.
Make Lift Timing Dur Band Bhp/L Bhp
---- ---- ------ --- ---- ----- ---
Standard Installations:
2.5 PI .340 25 65 270 2000-5500 50 126
2.5 PI Mk.II .340 18 58 256 2000-5000 49 124
2.5S .330 10 50 240 1500-4800 47 118
TR5/6(PI early) .360 35 65 280 2500-5500 57 142
TR6 (PI late) .340 18 58 256 2000-5000 50 126
Non-standard Installations:
BL Standard .340 25 65 270 2000-5500 58 145
BL Standard .360 35 65 280 2500-6000 67 167
BL Standard .360 35 65 280 3000-6500 70 175
(Above depends on other engine modifications done)
TT FR .390 30 70 280 3000-6000 57 143
Newman .390 30 70 280 3000-6000 58 145
SAH 357 .390 36 71 287 3500-6500 68 170
TT Sprint .390 38 70 288 3500-6500 65 163
TT SSprint .430 36 72 288 3800-6500 70 175
Piper .416 38 74 292 3800-6500 70 175
Kt/TT83 .420 42 68 290 4000-6800 75 193
BL USA:
S1 .450 31 71 282 3500-5500 63 158
S2 .410 42 71 293 3500-6000 63 165
S3 .465 37 73 290 3500-6500 75 185
================================================================
I'm not 100% sure on how to read this table, but the Timing is Inlet
Open, and Exhaust Open, then add the duration to figure the close
spec. The Lift includes the rocker ratio, which most camspecs don't.
(e.g. 240(cam lift) * 1.7(rocker ratio) = 408 total valve lift.
Unfortunatly, I don't think this table really answers your question,
as I don't think any of these specs really match the USA spec'd cars.
I think this as none of the USA cars had 158 bhp.
-Scotty
'75 TR6
'70 TR6
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