Cam timing differences for '94-only convertibles?

[djsilver]

According to a thread in ANOTHER forum , '94-only convertibles had slightly different cam timing from the other S13 240's. I asked for feedback from vert owners in post #6 of this thread (FA/ thread #147697, "KA24DE Cam Specifications") but never got any replies. Does anyone here have any experience comparing stock '94 vert performance to a '91-93 vert?

Thanks!

[94_240sx]

According to a thread in ANOTHER forum , '94-only convertibles had slightly different cam timing from the other S13 240's. I asked for feedback from vert owners in post #6 of this thread (FA/ thread #147697, "KA24DE Cam Specifications") but never got any replies. Does anyone here have any experience comparing stock '94 vert performance to a '91-93 vert?

Thanks!

I've read this somewhere too. Cams from 94 vert are supposed to be upgrade for other years KA(91-93). Not sure if that's true or not.

[Hijacker]

First I've heard of it. I would suggest calling up your local Nissan dealer and seeing if they can pull seperate P/Ns for the different years' cams.

I'm pretty certain this is all just a rumour, though. As it's pretty well known that the '94 verts were more or less extra verts from the '93 model year that were sold off during the chassis generation crossover.

[AZhitman]

Totally inaccurate to my knowledge.

94's utilized leftover 93 engines and coupe shells.

[Eikon]

I can't imagine why Nissan would have put different cam's into the '94's.. That doesn't sound accurate to me either.

But, Bart has the best idea...

First I've heard of it. I would suggest calling up your local Nissan dealer and seeing if they can pull seperate P/Ns for the different years' cams.

[djsilver]

I have a copy of the nissan FAST program. It lists the S13 exhaust cam (all) as P/N 13020-53F13, with an alternate P/N of 53F14. If you go to nissanparts.cc and search for F13 it'll tell you that it's been superseded by F14. Beyond that I can't tell about spec's. What I do know is that I installed a JWT cam gear on the exhaust of my coupe and retarded the exhaust 5 degrees to come close the the values listed in that post for the 94 vert and the 93-95 Altima. It really wakes the motor up! I haven't made it back to a dyno since doing it but it definately pulls better on the top end and I didn't notice any difference on the low end.

[Eikon]

I have a copy of the nissan FAST program. It lists the S13 exhaust cam (all) as P/N 13020-53F13, with an alternate P/N of 53F14. If you go to nissanparts.cc and search for F13 it'll tell you that it's been superseded by F14. Beyond that I can't tell about spec's. What I do know is that I installed a JWT cam gear on the exhaust of my coupe and retarded the exhaust 5 degrees to come close the the values listed in that post for the 94 vert and the 93-95 Altima. It really wakes the motor up! I haven't made it back to a dyno since doing it but it definately pulls better on the top end and I didn't notice any difference on the low end.

Good info dj.

Where's Dexter? He's the 'vert forums resident cam expert. I bet he'll know more than the rest of us do on the matter.

[Hijacker]

Unfortunately, in the Nissan world, a superseded number doesn't always necessarily mean that the part is different. If the '94 had had a different cam grind, then it would have pulled a different p/n from the outset.

Nissan updates old parts all the time to improve design/workmanship. When they do that, they get a new p/n. The timing chain assembly for the SR is a good example. An evn better example are the piston oil squirters in the bottom end of an SR. Nissan updated the part number for the S13 blacktop motors, but at first glance there is nothing different between the early redtop squirters. My only guess is they refined the design of the pressure relief bolt.

In the end, to verify that the '94s have a different cam grind, there would have been a totally different p/n for the '94 motor.

[DeXteR]

Here's one of the most comprehensive threads on KA cams I've ever seen. It's a good read.

zer...age=1

If you don't have an hour to read everything, just read pages 7 and 8 for now. Page 9 has some cool illustrations I made to help explain cam timing, but after that, there isn't much substance to the rest of the thread.

However, our collective conclusion regarding the rumor about the cams is that there was nothing special in the 94 verts.

[AZhitman]

Misinformation on a lesser board?

TERRORISM!!!!

[S15nS13vert]

i got a question, since we are talkin if the 94 verts are superior or not, the vert i got, it got lsd, and i was told, that all 94 convertibles have lsd.and when i bought it, it was dirty from a small buy here, pay here dealership, and previous owner was a female or a fruit loop, cuz i found make up stuff and a miami sound machine cd, so i dont think it was ever drifted.

[-RJ-]

you never know, maybe she likes looking pretty and listening to some maimi sound while drifting

[S15nS13vert]

lol....well maybe he got a sex change became a she, but his past life was a profesional drifter in osaka....uhmmmmlol

[Loki]

Wouldn't be the first time!

[AZhitman]

No LSD's in 94 verts either.

Possibly a junkyard replacement, but more likely just an open diff.

[94_240sx]

I'll confirm this. I disassembled my original diff and yeah, it was open diff for sure.

[S15nS13vert]

but when i take off, both wheels spin...........like a record baby round round......sorry