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tr-6 camshaft specs

To: ssutton@ban.CHINALAKE.NAVY.MIL
Subject: tr-6 camshaft specs
From: paisley@boulder.nist.gov (Scott W. Paisley)
Date: Mon, 18 Sep 1995 09:23:01 -0600
Cc: triumphs@autox.team.net
References: <B2e5+EppKkA@ban.chinalake.navy.mil>
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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