A few quick questions

[LancasterWannaBe]

I looked around on the site and did several searches and found nothing (a lot of links no longer work) so I figured it's safe to ask...
All these questions are regarding the KA24DE.

How much more does the ka weigh than the sr?
(lbs, Kg, N .. I don't care what unit)

What is the limiting factor in the Ka's top RPM?

Could you raise this redline with a rebuild?

If you completely rebuilt the KA - and lowerd the compression to 8.5 - could you boost the intake 20 PSI and have an 8500 RPM redline?

Would the head need new bolts to keep it attached to the block?

Does the 20% increase in displacement put the KA at any advantage over the SR?

How strong is the transmission for the KA motor?
(How much hp AND RPM can it handle?)

Thanks a lot to anyone who can aid my curiosity.
I appreciate it!

[DWF Engineering]

I don't know what the limiting factor for rpm on the KA is but I can tell you this. Yesterday I downshifted a bit to early and my S-AFC logged 7493 rpm peak. It didn't seem to hurt the engine but it was only for a fraction of a second.

20 PSI: Angelo Foreman's 240SX runs 25 psi on the street. It is a stock crank, Carillo rods, and 8.2:1 JE pistons. It makes 365 WHP @ 5600 rpm. I believe the head and cam are stock. If you get your peak hp to occur at, say, 8000 rpm, you'll be pushing 600 bhp, assuming all else is equal to the afforementioned engine. But then again, I think there are KATs making this type of power at much lower rpms.

The gearbox on your KA is as good (actually the same) as the one on the SR20 and CA18.

If high rpm (8500) is what you desire, maybe the CA18 is more along the lines of what you are looking for. I find it to be superior to the SR20 simply because you have more money left over or mods after the initial purchase of the engine. The KA wins in the price department though.

[datsunadict]

you said you had a 7500 rpm peak for a fraction of a second? for an I-4 that doesnt seem like a lot. i have seen sr20det's hit revs as high as 5-digits. my brother's honda rev-limits at 9 grand.

so, i guess i am wondering how you can get an engine to make max power at higher rpm's with mostly stock internals? simple turbo settings wouldn't do that would they?

[LancasterWannaBe]

No but your cam would.
For N/A engines, different headers do different things with the torque at certain engine speeds.
Don't know if thats true with turbo'd engines.
I don't know if the KA has electric radiator fans or not, but installing electrics and an electric water pump would free up some high end power. Also can't go against an underdrive alternator pulley.

You'd really need a turbo that could push a 2.4 ltr up to that high RPM, and obviously it aint going to be the same turbo you'd use for a 2.0 or 1.8.

Are sequencial turbos a good idea on a 4-banger?
A TT I-4 sound kinda funny...

But the cam still plays an inportant role. I believe the peak torque-point of the engine will not be changed unless you use a different cam (assuming the turbo is "spooled" at that RPM). So you should get a custom ground turbo cam if you're complete reworking your engine.

I still curious about the KA vs SR weight though. Any ideas?