Something Failed, let’s find it! Transmission Analysis.

[Claviger]

Well here’s the most accurate I was able to get with the tools at hand, I do think it’s pretty close since I was able to duplicate the results. Stock values listed in BOLD (given by Triumph at 1mm lift):

Intake 514-BC4
Exhaust 514-BC7

Edit: Previously posted numbers were all wrong.

For all the world to see, as promised. I was considering going bigger cams, but I really don’t think there’s any point in going up by a mere 0.006” lift

 

[Neville Lush]

Stock timing figures are done at.040" or 1mm. Those numbers would be different at .05".

 

[Claviger]

Edited measurements after adjusting my method and coming up with more reliable results.

A decent read for the less informed of us (I very much include myself):

Valve Timing Events and the Order of Importance - Engine Builder Magazine

 

[Claviger]

Now I need to go back and measure them at 0.04” DOH!!

The spec sheet from Megacycle is done at 0.04”....

 

[1olbull]

Now I need to go back and measure them at 0.04” DOH!!
The spec sheet from Megacycle is done at 0.04”....

Tis a metric bike.
Wanna be dead nuts, 1mm is .03937"

 

[Grumpy Ole Codger]

Tis a metric bike.
Wanna be dead nuts, 1mm is .03937"

Now what is the difference between English and American imperial measurements? Am I right in saying there is a slight difference ie. the American unit is smaller?? Therefore would that mean that the metric conversion factors to American inches is different to English?

 

[Neville Lush]

If one measures at 1mm lift it is then comparable to almost every metric brand. The .053" is a hangover from the fifties and sixties flat tappet V8s

 

[1olbull]

Now what is the difference between English and American imperial measurements? Am I right in saying there is a slight difference ie. the American unit is smaller?? Therefore would that mean that the metric conversion factors to American inches is different to English?

Nope -
25.4 X .03937 = 1mm

 

[mr hunt]

The metric system is French not English

 

[mr hunt]

The English gave you their inches so they are the same no matter which side of the pond you reside