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well in looking at that pic and comparing it to my Type-S cams sitting here, it's real hard to tell the difference. the Type-R VTEC lobes might have a little more material on the ramp approaching the peak, the Type-S ones are just a little bit flatter there. you'd have to have them side by side to see for sure.PbnJ said:
they're probably ground on the same machine from the same cores. I'm with Nikos, a precision scale may show the Type-R ones being a tad heavier.
S CAMS
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courtesy of LITTERBOX
courtesy of LITTERBOX
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close up of an R cam
and as you can see in the pics from inline 4.... they also have a groove cut.
bringing this thread back because I have Type-R intake cam sitting here along with Type-S cams... both intake cams weigh 1520 grams, I don't have a precise enough scale to see a small difference!
also the height of the VTEC lobe on both cams is exactly the same at 35.53-35.54 mm, as would be expected with the same amount of lift, and this matches the value in Ch.6 of the service manual. however, there is a tiny difference in the width of the lobe -- if I lock my caliper at 28.71 mm, it fits tightly over the Type-S lobe, but not the Type-R one. it is at least 0.05 mm wider (about the thickness of a human hair)
if you stare at them long enough you start to imagine that the Type-R lobes both low & high have a tiny bit more roundness to them on the ramp area. according to Crower & IPS it's only a few degrees more duration. it's about impossible to see any difference. can you tell which is which in this pic?
also the height of the VTEC lobe on both cams is exactly the same at 35.53-35.54 mm, as would be expected with the same amount of lift, and this matches the value in Ch.6 of the service manual. however, there is a tiny difference in the width of the lobe -- if I lock my caliper at 28.71 mm, it fits tightly over the Type-S lobe, but not the Type-R one. it is at least 0.05 mm wider (about the thickness of a human hair)
if you stare at them long enough you start to imagine that the Type-R lobes both low & high have a tiny bit more roundness to them on the ramp area. according to Crower & IPS it's only a few degrees more duration. it's about impossible to see any difference. can you tell which is which in this pic?
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the one on the left looks used, so I am guessing it came out of your RSX 
I cant tell a difference between the two. At first the one on the right looked bigger, but the whole cam looks like it is just sitting a little higher.
I cant tell a difference between the two. At first the one on the right looked bigger, but the whole cam looks like it is just sitting a little higher.
I just bought these brand new ITR cams from clubrsx, I noticed the intake cam has a (R2) stamp on it and the exhaust cam has a (R3) stamp on it. I popped my 03 K20A2 valve cover, the motor is sitting on my garage floor so i sat there and kept turning the motor over until i can see the stamps on both camshafts, They were stamped (R5) and (R8). The cams are identical to the naked eye in my opinion cuz i couldnt tell the difference.
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