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Triumph TR6 - Camshaft types

I do not posses the full history of my TR6. I would like to find out what type of camshaft is installed (standard; fast; ?). Is there a way to find out without taking the whole engine apart?

E. Creyghton


I can't think of an easy way.

You would need lift and duration specs. for both and then do a comparison.

A so called fast cam is not that far off a standard. So extensive deflection gauge setup and a cam wheel would be needed to tell? Timing chain and lobe wear can throw all specs. off?

Somebody else may have an easy solution. I don't. Sorry

Bill Brayford

I don't think there is an "easy" way but with some effort you can take some measurements (lift at the valve and duration) without having to dismantle the engine or remove the camshaft.

Once you have the measurments you'll know if your cam is stock and if not, the approximate aggressiviness of the cam.

Start by removing all your spark plugs and place a wrench on your fan extension bolt to turn the engine as required for the following measurements:

Remove the valve cover and rocker assembly and use your dial indicator to measure lift at the valve.

Then find top dead center of No. 1 piston, mount your degree wheel and measure cam duration. That's the number of degrees that the cam dwells with the valve open.

Once you have the two measurements, compare these to the specifications of the stock cam and you'll soon have an understanding of what is installed in your motor. Ie: if lift is much lower than stock you might have some wear in the system. If much higher, then some sort of "fast road" cam could be installed.

John Parfitt
73 5 speed.
John Parfitt


Sorry made a mistake on my description of measuring the camshaft lift "at the valve".

Just remove the rocker assembly and using your dial indicator, measure the "camshaft" lift by measuring the movement of the pushrod against the dial indicator. That gives you the lift of the cam lobe.

John Parfitt
John Parfitt

Hi Erik,
You can remove the camshaft while the engine is in the car and measure it, but the info is probably not worth that much work! Unless you have reason(s) to suspect otherwise (like maybe the car came from a performance enthusiast and/or has other modifications, or documented work history on the car - ya right!) it might be worth betting that your cam is stock: if that is the case you could check any manual for the specs for your year. Also the MOSS Triumph Tune manual that came out of Great Britain has good information on camshaft specs and selection.
good luck

Thanks for the advise, I understand the messurement approach.
I have the impression my camshaft is a factory installed type. If a fast/aggresive camshaft is installed should one also not change the distributor. Is there perhaps a way to identify at distributor level if such operation has been performed ?
E. Creyghton

This thread was discussed between 13/07/2003 and 14/07/2003

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