OK. Found the part number: 311399. This is on engine number CC79202UE. This
means on my 72 TR6, I have a pre-73 block and a post 73 cam. One thing that
puzzles me is that The Roadster Factory book gives the same part number for
late PI and carb cams, but the Bentley shop manual gives different
durations.
I found a web site which gives lift data integralcams.com. Couldn't find
this anywhere else. It gives valve lift of .354/.345 intake/exhaust for late
TR6. The data for the cam I bought says .415/.400. Can anybody vouch for
this? Maybe I assume wrong, but shouldn't more lift mean bigger lobes?
Now, I thought I was buying more lift with the new cam, but unless I'm
missing something, my measurements show otherwise. Guess I'll have to give
BPNW a call.
- Hugh
> I was just comparing the new Piper 270 cam that I bought with
> my original
> cam. Lobes on the old cam are more gradual. I was surprised
> to find that the
> height of the lobes on the old cam is about .125" more than
> the new cam.
> This makes me wonder if the old cam is stock. As I understand
> there was a
> Triumph S2 cam -- possibly the one used on the PI TR6. Maybe
> this is what I
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