Glenn,
The timing specs for the late TR6 cam are:
Intake open 18 deg BTDC, close 58 deg ABDC
Exhaust open 58 deg BBDC, close 18 deg ATDC
I believe these timing specs are supposed to be point of opening/closing.
If that is the case, with valve clearance spec of .010" at the valve, the
tappet has to move .010" divided by rocker ratio of 1.45:1 = .007" before
the valve starts opening. So you should be able to time to these specs at
.007" of tappet lift. Stock cams I have checked appear to have this
advertised duration at about .010" tappet lift so you may have to go to
.010" to get these timing points to hold out.
I have never seen .050" timing specs for the stock cam but the ones I have
checked appear to have about 210 deg duration at .050" so the timing specs
would be:
Intake open 5 deg ATDC, close 35 deg ABDC
Exhaust open 35 deg BBDC, close 5 deg BTDC
Regards,
Richard Good
Good Parts Inc.
--------------------------------------------------
From: "Glenn Franco" <gaf3@charter.net>
Sent: Tuesday, May 31, 2011 3:05 PM
To: "Friends of triumph" <fot@autox.team.net>; <6pack@autox.team.net>
Subject: [Fot] Cam Timing Degree Specs
> Hi
> I putting a late model 74 TR6 back together after a rebuild.
> I'm attempting to time the cam. This one has no marks on the gears since
> it had been replaced.
> I have the degree wheel set up but I'm having difficulty finding the cam
> specs for a stock TR6 Cam?
> And if found what amount of lift does the specs relate to (.050"??) on
> this engine.
> Can anyone out there point me in the right direction.
> The head has not been installed and I have the degree wheel set and the
> dial indicator taking measurements off the pushrod.
> Thanks in advance
> Glenn
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