Why does an L28 make less HP than a L24?

[SFART]

Hello all. I am new to this forum and I have decided to start off my first entry (question) with what i feel is a very rookie question--

Why does an L28 make less HP than a L24?

To my understanding, the fuel-injected L28 makes less HP because of "an increase in smog emissions requirements(back in '74)." So, I assummed that removing all of the egr and smog stuff would make for an immediate HP gain. But, I read that this in fact does not icrease HP and could even lead to a decrease in HP. Any info relating to this would be greatly appreciated since the answer to this question has evaded me for so long.

BTW, I currently do not own a Z, but I am planning on purchasing one soon.

Specifically, I am planning on swapping a 280xt engine into an early Z. Still looking for the right one!

[SteveJ]

Define less.

Read these links with regard to net and gross horsepower:

http://en.wikipedia.org/wiki/Horsepower

http://neptune.spacebears.com/opine/horsepwr.html

I'm not sure when Nissan started using SAE net horsepower for rating their engines, but I know that the 2.4L is a gross horsepower rating.

[sblake01]

I think Nissan made the change from gross to net in 1979. The 78 L28E was rated at 170HP/5600RPM vs 150HP/6000RPM for the L24, both of which are net HP. The lower HP ratings for the L28E began in 1979.

[Mr Camouflage]

Specifically, I am planning on swapping a 280xt engine into an early Z. Still looking for the right one!

If you are putting in a 280zx turbo motor, isn't this discussion rather pointless, as the zxt can make alot more power than either the L24 or L28.

[GunnerRob]

...and why are there two threads created by the same member on the exact same topic?

[sblake01]

Three!!!!!

[kenz240z]

Hi, SFART,

Welcome to the club!