91-93 248/248 cams how to

[LV240s.ex]

first off peeps Im not taking credit for anything here and also theres is a write up about this already(which is what I used). the only reason Im doing this is because Im a visual person and I know a lot of other people out there are so Im hoping with this to make it easier for some people to get this "upgrade" accomplished with no problems or question, but if I forgot anything feel free to add it

so what do I need?

- well you'll need a 91-93 exhaust cam(Im not sure if the 95 will work but just stick to the 91-93, why make it harder! lol) -Tools duuuuhh!!! hahaha (include a 1" socket in it too) -Valve Cover gasket (If you like doing things right) -some sort of car knowledge too! lol

How to:

K so the first thing you wanna do is remove the valve cover bolts(10mm) and spark plug wires



some of you might have this gasket maker crap that people looove using, clean it off! I used an old shirt and plenty of hand work! lol



with the valve cover off take the number one cyl. spark plug off and turn the engine until you achieve TDC(top dead center, I used a dip stick and put it in the plug hold and turned the motor until the stick reached its highest point)



when you get to TDC your first cyl. cam lobe's should be facing outwards as so



at this point you're gonna want to mark the cam and chain so that you have a reference just in case you mess up when is time to turn it or if you mess up period! lol I used nail polish but use whats best for you



while you here notice that the cam that you will be swapping(the intake cam) is marked green (the exhaust is marked orange as you'll see later)



the next step is going to be the cam gear bolt...



with the 1" socket a braker bar and some muscle milk power, brake it loose counter-clock wise....



if you dont have two braker bars a chopped down single cam exhaust manifold and a crescent wrench will do!!!



careful here as the bolt has a washer that can easily fall in there and cause you a nice headache trying to get it out!



carefully and keeping in mind the positions, softly tap the gear out off from the cam



it makes it easier if you keep the gear and chain tight till is time to work with it again like so...



with that done now move to the cam's caps and loosen the bolts(10mm) start from the center and move out in a criss-cross pattern



keep all that caps in order the way you took them out



remove the intake cam(you might have to softly tap it a bit) and replace it with the other 91-93 exhaust cam you got, you should now have two orange striped cams...



oh yea...and dont forget to lube it before you put it in!!!! hahaha



put the cam caps back on and tighten them in the same manner you took them out, torque them to 6.5- 8.5 ft-lbs



now comes the trick to this so pay attention, the intake cam gear that you marked, rotate that four teeth counter-clock wise



the marks should now look like this...



keeping the position on the gear turn the CAM until you cam put the gear back on it, the little nipple and the ridge will line up! put the blot back on and torque it down to 101-116 ft-lbs



at this point turn the engine manually to make sure that every is working as is supposed to, if it stops turning or you feel it super hard to turn then you did something wrong, start over! sorry buddy lol

if everything goes well then get you brand new gasket(hopefully) and put it on



put the valve cover back on and tighten up the bolts



now clean her up good so that she looks worth showing off!!!



put the plug wires back on and crank her up, it should start no different than before! if it doesnt then you did something wrong, again sorry buddy but START OVER! ;] lol .....if she starts then YOU DID IT MAN!!! it might tick a bit but it'll go away after a lil' bit, and the only noise you should get is this slight kool lump from your 248 cam set up, Im not sure how much power it gains but it pulls a whole lot better from about 4800rpms and up!!! good luck and EJOY!!!

p.s. Im by no means responsible for anything that you do wrong this is the way I did it and it worked for me so dont come crying to me if you brake your ****!

[le_ryan]

very nice write up man !

[White Comet]

very informative and i liked the pics. that chopped up sohc manifold is the coolest tool ive ever seen

[Robsx_se]

wow great write up an lots oh pictures. thanks i'll do this some time!.

[Zippy69]

Great job on the cam swap! I just don't think that shade of nail polish really goes with your eyes.

[White Comet]

^ haha, im surprised no one mentioned it sooner

[LV240s.ex]

ay thanx guys, just figured is a whole lot easier when you can see pictures right! imma try to do as many write ups as I can as I go along upgrading the chick! near future plans are turbo and interior clean up, so stay tuned peeps!!! :big

oh yeah, the nail polish, please go buy paint markers so you dont look like a fruit like me! hahahahahahaha

[1sikS13]

you know ive read the other thread so many times but never got the balls to pick up an exhaust cam and do it because im like you said a visual guy....but now i think i have a reason to actually go get one and do it because ive got the pictures to follow...A+ write up man one that i will definatly use thank you

[White Comet]

yeah i can def see this being helpful to many, lol at looking like a fruit

[user name!]

Great write up!

[stopatnothing]

Wow, I really wasnt expecting something of that caliber. Great descriptions to go along with great pictures. You sir, are a scholar and a gentleman.

[White Comet]

^ a gentleman? does he treat u like a lady?

[stopatnothing]

^ a gentleman? does he treat u like a lady?

*sigh* maybe someday he will...

[mrgreeneyes]

i am only posting b/c i literally LOL'ed at that...

[stopatnothing]

i am only posting b/c i literally LOL'ed at that...

haha glad to hear it.

btw... you, me and whitecomet have been posting in the same like 5 threads all night i just realized

[White Comet]

^ yeah thats normally how it goes, 2 or 3 ppl will be posting rapid fire in teh same threads

[ScrapMetal]

Really nice, they should put this in the stuck thread or something.

[LV240s.ex]

Really nice, they should put this in the stuck thread or something.

hahaha

[JackIrish]

Great write up man, now that i see this maybe I'll go and do it!whenever you turbo your car you should totally do a pictoral write up like this!!(basically so i can follow along )

[187DAWG]

just curious about why you didnt shim out the new exhaust cam ... or do you not have to ..... i am confused

[duffman1278]

NIICE write up!!

[LV240s.ex]

this

just curious about why you didnt shim out the new exhaust cam ... or do you not have to ..... i am confused

as far as my research goes you do not have to shim it out, reason being, you're not changing the lift enough to where it will interfere with the pistonsr, unless your valves were ticking prior to the swap, in which case, yes you would want to.

also some additional info. I found, you CAN use the 95-98 cams, but you wouldn't want to anyways, they have a far shorter duration. neither can you use the 94 cam due to the change of the timing angle

91-93 exhaust opens 64 deg before BDC & closes 4 deg after TDC94 exhaust opens 60 deg before BDC & closes 8 deg after TDC

and last (but hopefully not least) the 96 altima cams have the same specs as the 91-93(the ones used) but for some reason it is said that they do not work, I haven't been able to get a hold of one so I personally dont know for sure but as soon as I get a hold of one I will do all the testing I can with it and post the results. hope this is helpful for you guys

lateJorge

p.s. I drove the car the next day after the lil' swap and it pulls AMAZING! cant wait to see how it pulls turboed<--hopefully by monday!!! fingers x-ed!!

Modified by LV240s.ex at 7:26 PM 11/29/2007
Modified by LV240s.ex at 9:30 AM 12/9/2007

[iitywygms]

If you want to take it a little further redrill the cam gear. I did a swap, 248/232 and loved the results. Then I added 2.5 degrees advance, using this how to, zerothread?id=199832 (thanks to d!ck)to the intake cam and gained more low end. It is really simple with the template.I just love how simple this is and the power you gain from doing it.Nice write up btw.

[White Comet]

my friends was mentioning something about doing that to the cam gears, know i should tell him to try it

[(Yoshi)]

I just did this on my car a few weeks ago.

[White Comet]

^ ur user name is misleading unless u actually have one

[boriquaS13]

Very nice and good work.

[187DAWG]

yea i did alot of homework on this and found out you didnt have to reshim so i will be doing this in the near future.. i wonder how much deference this will make with the turbo and all ???? oh yea great write up ....

[White Comet]

im slightly confused, what did u think needed reshimed

[LV240s.ex]

yea i did alot of homework on this and found out you didnt have to reshim so i will be doing this in the near future.. i wonder how much deference this will make with the turbo and all ???? oh yea great write up ....

yeah I wish I had the money to have dynoed it with out the cam n then after n then with the turbo buuuut, Im no where near wealthy enough to do that! hahahah but even tho I have a VERY small turbo(t3) turbos are a top end power adder(do to spool time) and so is this cam set up so Im guessing Imma have a great time from about 45-4800 and up!!! cant wait!!! I'll keep updating as much as possible. BTW has anyone used the AFC NEO??? if so care to share some info pls.