Camshaft Profiles Measurements Markings GS1150

[londonboards]

So I did a little digging around and found that I had accumulated a number of camshafts.

(Do you do that sometimes: buy stuff on eBay then find you already have one/some of those?)

This is what I found:

Spot the one with the ground down journals.

They all had different markings and measurements. So I made a little table of the results:

This is where I am totally lost.

1. Set 1 has higher lifting intake lobes that it has exhaust lobes. Set 2 has the reverse - higher lifting exhausts. Something funny going on here. Which is correct? The manual shows that the inlet cams should be higher.

2. Set 1 exhausts measurements are higher than standard (as displayed in the manual) exhaust measurements. So I am presuming they are "hot" cams of some description. But how do I compare them to the measurements you are given by the likes of APE like this:

Even if you take the maximum lift of the lobe away from the core diameter of the lobe (ie. 34.96 - 30.10 = 4.86 mm or 0.1915") you don't get any figures that match anything that APE does.

How do I measure/determine what type of camshafts and profiles I have?

What do the marking numbers mean?

Greetings

 

[posplayr]

The lobe height is the diff in min to max is multiplied times a rocker arm ratio like 1.5:1(IIRC) . There are various opinions on what that number is. Except for wear the lifts are generally every 1/2 of a mm. I have tabulated the various specs in a thread.

http://www.thegsresources.com/_foru...V-Valve-Lift-Diameter&highlight=camshaft+lift