Tomei Poncam

[Wedge]

Ok i measured a lobe on exhaust side and the base circle is 32,43 mm and the high of the lobe is 41,19 mm .

[mcfly]

well a pon cam would be a close bet
cant tell if it is type a or type b by the lift.

Then again they could be any aftermarket cam with a 9.15~ mm lift.

[Allan74]

Originally Posted by mcfly

cant tell if it is type a or type b by the lift.

If they are Tomei's, you can tell between Type A and B.....just not R and B (without them being side-by-side to compare).

R has matched 250 Duration, A has split duration 250/260, B has matched 260. All are equal lift.

[mcfly]

yes, so you cannot determine a/b from the lift.

[Skym]

Some reprofiled stock RB20, RB25, RB26 cam specs are mentioned here -

http://camshafts.co.nz/Nissan.aspx

[jimbojones]

Originally Posted by Wedge

Ok i measured a lobe on exhaust side and the base circle is 32,43 mm and the high of the lobe is 41,19 mm .

Math says these are 8.76mm lift...lowest Tomei goes is 9.15 and those look nothing like my Tomei's...

Tomei stock #'s: http://www.tomei-p.co.jp/_2003web-ca...aft-specs.html

Edit: base circle should be 32mm. Are your measurements EXACT?

HKS Step 1's are the only cams I can think of that come (prebuilt) as 8.7mm lift; duration 264....I cant read the last digit clearly in the photo (looks like maybe 269?). Would also have 'HKS' stamped on it and I think their lift/duration are also stamped. If it's NOT 264, then these may be a knock-off/regrind.

[mcfly]

Jimbo is on to something, my math sucks and they can't be pon cams

[Wedge]

The measurments could be a little wrong i just used my caliper and did my best to take the measurments but it should be by much i dont want to take out the cams just to measure them but ill try to check again if my measures change . The HKS dont have the indentation in them so its starting to look like i have stockers in their !