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Nick McCollom
99 Infiniti G20
93 Nissan NX2000 14.027 @97.98 (N/A) I wish I had time and money again, this little car has sat for 2 years now. I do miss driving it bad. It will be back soon though faster than ever.
I've added the piper grinds, stock roller rocker specs, and stock gtir specs. Thanks to the people that mailed me those specs.
I’m working on adding a new section for other assorted valve train components, mostly for valve springs and retainers. Some manufacturers have specs for their valve springs listed, some don’t, so it may be a little spotty, but it should at least cover all the part numbers. I’ll also include other miscellaneous items like cam gears, rocker arm stopper kits, etc.
I’m still looking for the following specs, I know some of you probably know them.
Stock 94 intake cam (anybody got a '94 FSM?)
Old JWT S1 cams
Old JWT S2 cams
JWT S3 GTi-R cams
I dont think the S1's ever made it past prototype stages. I dont really remember to clearly because it was like 5 years ago but I am almost positive the S1's never made it to production but the S2's did. They were'nt called S2's at the time because they were the first ones sold. People on the list started calling them S2's once the S3's came out. Again I'm not sure but I think thats how it was.
No problem. It's free for any kind of use. If you find any mistakes or updates, I'd appreciate it if you e-mailed me though.
I've got a bunch of more stuff to add to it, hopefully I'll have it all added this weekend. Update some of the prices, and new sections for other head components.
Just out of curiosity, can you get the APEX'i cams? I've found one US importer that offers them, but they're really expensive (close to $1000 a pair). Just curious if they were really that expensive in your neck of the woods. Kinda hard to find any prices for them on Japanese web sites. I'm not looking to buy, just was curious.
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All posts by Calum in this thread are copyrighted by Calum, and cannot be edited, deleted, or copied without his express permission. calum@calumsult.com
I bought my car with cams previously installed, the owner said they were JWT 2nd generation cams - I presume he ment the s2 cams. Anyway to tell for sure? The cams are currently not in the car. Also do I need to have the jwt s2 program to run them correctly?
I bought my car with cams previously installed, the owner said they were JWT 2nd generation cams - I presume he ment the s2 cams. Anyway to tell for sure? The cams are currently not in the car. Also do I need to have the jwt s2 program to run them correctly?
Get a set of calipers and measure the highest point on one of the lobes. Multiply that by 1.55 and you'll have the valve lift. If its close to the S3 measurements, its probably an S3 cam. If not, its an older grind. FWIW it seems the "S3" grind has changed once. There is no easy way to measure duration.
there are a banch of Nissan OEM cams that you might add to the list.
If you plan to do so, I can give you their specs.
Chris
Hey cool. Just pm me what you have and I'll add them. I've already got a couple more myself, I just keep getting behind on updating it. Stuff that pays the bills takes priority.
Calum if you would like I can give you an account on my hosting I now have so you will have a place all the time to put it. Seeing how your time at UTK is limited. Let me know i can setup a subdomain for you and email also
OK cam people, quick question for the knowledgeable.
What dictates the need for upgraded springs and/or retainers when using a cam?
Is it the lift alone or the combination of lift AND duration?
Case in point:
We know that JWT S4s can be run with the stock springs.
Now, those have 266 deg duration and 11.8mm lift.
(QUESTION: Above numbers are from Calum's list - I laways thought they were 264-11.5 or something - when did they change???)
If JWT's 266-11.8 cams can be run without uprated springs, can we assume that another manufacturer's 264-11.5 can ALSO be run without springs?
I know the actual cam profile has something to do with it but the theory of cam profiles has been, more or less, exhausted a couple of decades ago. I find it difficult to believe that the slight differences in profile can allow a 266-11.8 cam to rev up where another 264-11.5 can not!
Any ideas/opinions?
ANd while we are at it, an example question may clear thing up:
My "ad-hoc" intuition says that the 270 which pushes the valve to the same 11.5 lift over a longer period (6 degrees of crank rotation more) is LESS prone to valve floating than the 264 which pushes them faster.
does anyone know the answer to the above stated question. because i am interested to find out if the stage 2 cams from zex(in. 268 duration + 11.43 lift and ex. 278 duration + 11.53 lift) really need a valve spring upgrade. any help would greatly be appreciated. TIA...
p.s. i know the list says that it can be used with stock valve train but, i went to nipponpower.com and the website reccomends a valve spring upgrade just want to be sure before spending any money on a product.
