what's the deal with our engines?

[DeXteR]

i don't know how many of you have been keeping up on my project log (found here), but i've run into a bit of situation... nothing major, just something i'm trying to figure out.

i did the "hot cam" swap last night and something i neglected to double check was whether or not my cams are indeed the 240/248 as i was hoping. see, our verts are kind of like the bastard step kids of the s-chassis because they're very much in-between production of the s13 and the s14. from what i gathered on the cam thread (found here), late s13's and early s14's had a lot of parts mixed up including the intake manifold and the cams.

i'll explain...the s13 ka should have vaccum actived secondary valves in the runners of the intake manifold and a set of 240/248 cams. the s14 ka should not have secondary valves and a pair of 232 cams. from what i've gathered. the 93 ka started having the intake manifolds without the secondary valves and some goofy cam combos including 240/232 and the 232/232 in addition to the 240/248. then some 95's used the s13 head design... so they probably have some goofy cam combos as well.

well, my 93 vert has the secondary runner valves in the intake manifold. i also believe it has the 240/248 cams. but i'm not really certain. also, the original intake manifold from my other vert has the same secondary valves. supposedly the FSMs are foggy regarding cam profiles after 92... possibly because they just didn't know.

i guess i'm just tossing this information out there and looking to see what you guys think. i need to double check the actual production date on my verts are to see if they were made in 92 or what. perhaps that will help with this. i'll share any other information i come across.

hey 94 guys, do you have the vaccum activated secondary valves in your intakes too? do you guys know anything about your cam profiles?

[le_ryan]

... I know nothing anout my cam profile. ...

[94_240sx]

Is this going to help?

http://www.nicoclub.com/articles.php?id=158170

[DeXteR]

i just read the whole thing and..... no. i'm all ready past that stuff.

i'm talking about the verts in general. from what i'm coming across it seems that our model year engines are slightly different (behind perhaps?) the other model years. which would probably make sense depending on how long the convertible conversions took...

maybe the other people i've talked to are confused. i just don't know. i haven't seen enough s13's to form my own opinion on this.

[Eikon]

This is a pretty interesting topic.

I wish I knew more about KA's so that I could be helpful.

My understanding is that all 93 and 94 model years were chassis built for the 93 240sx model year run.. But they were seperated out and sent ASC for conversion.

I wouldn't be a bit surprised if at some point, they changed the engine builds on them. If the KA was tweaked a bit for the S14's... they may have sent an early batch of those engines to fit in the "leftover" S13's that they converted to droptops..

Dex.. I'd post a new thread in the KA forum and see if some of the experts over there can shed some light on the issue.