L24 E31/E88 camshaft on L28? good idea??

[BuDavid]

refering to the table shown on http://www.atlanticz.ca/zclub/techtips/cam/index.htm

I noticed that the lift of the intake valve is higher than others on the E31/E88 camshaft.

will it be a good idea to mount this camshaft on an L28/P90?

or just go for MSA camshaft kit (if it is worth it)? I'm not looking for a big mess on the road with tune up. I just need a hot ride with unnoticelable power;)

thanks guys.

[RIP260Z]

I think the difference in lift is small and this equates to no more horses. If you do swap the early cam, these are externally oiled, you will need to use a set of cam towers which have provision for a spray bar, whilst the cam on the P90 are internally oiled.

Ian

[BuDavid]

the tower is available it wont make any problem for me.. but I heared that it performes better than the original cam on the P90..

anyone experienced this before?

anyway Ian.. thanks for the info..

[jmortensen]

The difference between the two is so small it isn't worth the hassle to install it. Find a cam grinder and have them grind something that's large enough to be worthwhile. I can only assume that you have cam grinders in Bahrain. If not, order a larger cam from MSA or better yet from some other cam manufacturer. MSA is not the only game in town, ISKY makes cams for Z's as do many others. As far as size of the cam goes if you're running stock injection you really can't go too big, I think the MSA stage III is about the limit (and that's still very small). If you have SU's the MSA Stage IV is the one that I'd start with, and for triples on the street I'd look for something in the .520/300 lift range. When you start getting into the bigger sizes, it helps a lot to have more compression than stock, but even so, I got a healthy bump in power going to something very similar to the MSA Stage IV from something like the MSA Stage II on my otherwise stockish engine with SUs.

There are some other things to consider. RIP260 already mentioned the internally oiled vs spray bar cam. The other thing is the springs and retainers and valve seals. If you get over lifts of around .470 or so you run into the valve spring retainer hitting the valve stem seal. The solution here is to run a lower profile valve stem seal. Here is more info on that: http://forums.hybridz.org/showthread.php?t=90825 Also at around .490 you run into coil bind on the valve springs. The Schneider valve springs and retainers work with cams up to .600 lift, so they'll do the job and they don't have excessive seat pressures either.

The last thing to worry about is that at some point, and I'm not sure where this is exactly, the pistons will contact the valves. You need to check this, or have the pistons flycut to provide clearance.

[BuDavid]

thank you Jon, clear enough.. it seems that it is a bigger headache than I thaught!

with stock EFI I should go for bigger than IV! thant means rough idle.. I wont need that for sure.. I think I'll just forget all about it since it is not making a big difference unless I use big cam as you mentioned.