True specs on s13 hot cam upgrade from Brian Crower

[3dKa24]

Lately ive been wondering at what lift the 91-93 Hot cams were measured so I decided to Email Brian Crower. This is going to shock some people but the specs that have been posted for These are completely off according to NicoClub- Specs for the Cams are 240/248 (int/exh) @ .020" but according to Brian Crower a definate reliable source who sourced the info straight from nissans spec sheets, is that these cams really are 227/241 (int/exh) @.020". So this mod is a nice boost but not what we thought.

So those rocking the dual exhuast cams specs are 241/241 duration not the 248/248 combo we thought we had. I think some of you guys might find this info valuable.

BTW heres our dialouge

(Heres my Email sent to Brian Crower)

Hello, Im a member on the forum Nicoclub.com and there seems to be a confusion on what stock Ka camshaft specs are. Every one belives that 91-93 240sx camshaft have the following specs intake cam = 240 deg duration with a 1.6699”-1.6774” lobe heightexhaust cam = 248 deg duration with a 1.6699”-1.6931” lobe height. But on your site its stating a 256/256 degree advertised duration. Can you clear this up so I can inform the KA24DE community, as to what the true specs are. Thank you

(He replied with)

The question is 240 degrees at what checking height?



Typical checking heights are .020” and .050” for mechanical applications like the KA24DE. On hydraulics like the SR20DE, typical checking heights are .006” and .050”. At least that’s how the V8 market has been doing it for the last 50+ years. The JDM market does it differently. They list Advertised in 8 degree increments, therefore a Stage 2 is 264 and Stage 3 is 272. It never made any sense to me, but when I started this new company, I decided I was going to adopt the JDM listing for advertised duration but still list duration at .050” for comparison purposes as that spec is the most accurate way of comparing cam lobes in my opinion. I have spec sheets for all cams listing .006”, .010”, .020”, .050”, .100”, .200”, lift, max acceleration, velocity and jerk, but it is too much information to list for the consumer. They just want to see the dyno comparison and know the mods.



Lift is basic due to the bucket follower, no rocker ratio, but it is more accurate on a dial indicator versus measuring base circle size and lobe height.



So we’re going to put the attached dyno comparing the two part numbers (BC0211 vs BC0212). The advantage of BC0211 is no spring change required and a smoother idle. Obviously the advantage of BC0212 is more top end, more power.



If you have any further questions, please do not hesitate to email.



Thank you,



Brian(Also sent me this )

Stock specs are:



294/296 @ .006”

273/280 @ .010”

227/241 @ .020”

203/207 @ .050”

181/185 @ .100”

138/142 @ .200”

.345”/.357” lift



Thank you,



Brian

Sorry for the long post.

[3dKa24]

Oh yeah heres the dyno comparing his Stage 2 with his Stage 3, Im guessing this is on a Turboed KA.

[AZhitman]

Nice work!!!

[Bigvinnie]

Finally the NICO members are catching on to the proper durations.......Those stage 2's run a ultra smooth torque band at lower RPM, I just think I am about to buy them....