Triumph pre-unit valve timing

Hi

Can any kind soul tell me what the valve timing for a pre-unit iron head
T110 shoud be please?
I'm looking for the number of degrees so I can check with a degree disc,
rather than the standard way of using the timing marks.

TIA

Chris.

 

Hmmmm. I've got the inevitable crappy Haynes manual for Pre-units Twins
1947 to 1962 - PLUS the reprint of the Triumph Workshop Instruction Manual
No. 17 1956 to 1962 that has a technical data sheet for the Tiger T110.

The tech data pages for the Tiger T110 in the Workshop Instruction Manual
gives the following figures:

Valve Timing: (with 0.020 in (0.50 mm) tappet clearance for checking)

Inlet Valve opens BTC 35 degrees
Inlet Valve closes ABC 85 "
Exhaust Valve opens BBC 73 "
Exhaust Valve closes ATC 50 "

all these values are group bracketed with what I presume are tolerance
values of -0 degrees +5 degrees

The spec table in Haynes is a dog's breakfast and difficult to make sense of
at all.

I should point out that Haynes seems to imply that the T110 only ever had a
combination of cast iron cylinder block and a light alloy cylinder head -
but God knows whether you can trust that or not, as any of their figures for
the valve timing for any model (except for the Bonneville), bear no
resemblance to those above.

Give me a yell if that comes across as a load of bollocks and I'll sort some
scans out so you can see why.

 

Roger

Many thanks for your swift and informative reply.

Chris

 

Given that all Pre unit cams are pretty well interchangable , and that
owners have had a propensity to fit "E3134" profiles , and that there are
different cam followers also , bearing in mind Triumphs 3 keyway "vernier"
arrangement and the fact that Haynes manuals are bloody useless, I cant say
I envy you the task.
Steve the grease