Need help with what the cams look like when first piston is at TDC

[s13drft89]

Need help with what the cams look like when first piston is at TDC

[corn322]

the lobes for cyl. 1 will be pointing away from eachother.

zerothread?id=62997

that's the sticky about cam alignment at the top of this forum. look at the pics.

[InsanityInc]

That thread isn't particularly accurate. Apparently, s14 cams have a different LCA, and point directly away from eachother, while s13 cams point slightly upwards.

[:: orion ::]

Insanity -

Shouldn't be...as you know, the S13/S14 KA cams are interchangeable, and should ALWAYS point away fom each other at TDC...if alligned correctly.

That thread is correct.

- Brian

[TheOne]

also look at the crank pulley mark, i believe that will tell you better if you are in compression stroke or exhaust stroke(TDC)

[InsanityInc]

Insanity -

Shouldn't be...as you know, the S13/S14 KA cams are interchangeable, and should ALWAYS point away fom each other at TDC...if alligned correctly.

That thread is correct.

- Brian

Every s13 or diagram for one I've ever seen has the cams pointing slightly up at TDC. Even the FSM for the s13 says they should be that way. Also, if I set my cams to be straight away from eachother, the compression goes waaay down, even though all my valves are fine and the cylinder leakage is below 8% on all cylinders.

Not to mention that the chain between the cams has slack in the top picture of that thread, so it's a bad representation of cam phasing anyway. If he rotated the crank by hand to get rid of the slack, the cams wouldn't be pointing straight away from eachother anymore.

[fbodtrek]

I've got news for you, they DO point straight away from eachother. I've pulled apart quite a few KADE motors, of all years, that post is correct. If they are pointing "slightly upwards", you wouldn't be able to achive compression, plain and simple (if you don't believe me, adjust the cam phasing in that amnner and try it out). They lay facing directly away from eachother just like this:<O O>

[InsanityInc]

I've got news for you, they DO point straight away from eachother. I've pulled apart quite a few KADE motors, of all years, that post is correct. If they are pointing "slightly upwards", you wouldn't be able to achive compression, plain and simple (if you don't believe me, adjust the cam phasing in that amnner and try it out). They lay facing directly away from eachother just like this:<O O>

Uh, my car IS phased like I described, and the compression is 190psi across the board. Not to mention if I were to have them pointed straight away from eachother, there would be more links than there should be between the cams.

[:: orion ::]

Every s13 or diagram for one I've ever seen has the cams pointing slightly up at TDC. Even the FSM for the s13 says they should be that way...

I'm not exactly saying they don't point slightly up...just that S13 and S14 cam alignment is identical.

- Brian

[InsanityInc]

I'm not exactly saying they don't point slightly up...just that S13 and S14 cam alignment is identical.

- Brian

That's possible, but every picture I've seen of s14 cams has them pointing pretty much directly away from eachother, and has them looking noticably differently phased than the ones in my engine.

[deviousKA]

Each of the lobes are supposed to tilt slightly upwards, not laying completely horizontal opposite each other at tdc.

edit: there should be no noticable difference between s13/s14 in this respect, or altima and truck for that matter.

[DjPantsSpecR]

absolutely true, devious always knows. but both of you folks are too hard headed to admit the other is sorta right.

I have a 248 intake and 232 exhaust, an s13 and an s14, the lobe placement is identical to the other post. Identical to my first S13, my second S13 and my 2 S14 motors, its a damn good representation, plus when you install the cams its only natural to get that little bit of slack. Its good practice to rotate the motor around as you say, or else you will hear it tightening when you start the car and its not a nice noise.

So you're both right. they point directly away from each other, but angled slightly up. and depending on if you have 232s 240s or 248s that angle changes slightly, but not enough to be off by one tooth.

I was a fool to ever run 248/248. 248/232 has almost identical topend, but the torque.... ahh.

[fbodtrek]

I was just fuzzy on what he means by "slightly upwards" ? The lobe "tops" are horizontal in relation to eachother, it's not 180* out from eachother going from the lobe centerline... I guess you could say they are slightly upwards...but not enough to actually tell people that...it would confuse alot of newbs whoa ren't familiar with these motors. We all know that when doign a cam swap, the cams only fall in ONE way to begin with, mainly because of those lifters...rotating them ever so slightly will either allow them to be installed back on the cog or not. Sorry for any bickering, I just don't want to see another scrapped KADE because some noob misinterpreted somthing minor. For all practically purposes they point away from eachother, that's all

[s13drft89]

So whats is it point away from each other or up, or just like the picture, that CORN322 sent me????? Also my car is a 1993 240sx of course KA24DE

[corn322]

away from eachother.