Well i currently own a 78 280z and a 71 240z.. just wanted to throw that in there :P

Ok now i have a 71 240z like i mentioned that i wanted to make more POWER and take full advantage of the weight my car has.. ( near none) so i was thinking.. a car that weights nothing. with an engine that pulls everything. HEY! what more can i want. So the car hauls *** with its original l24 engine (carbs) BUT! i was woundering if it would make a difference at all or what. if i swaped the l24 block and head ETC for an l28 ( keeping the carbs on)

What would be the best engine to run? would it even make a difference? and can i run the l28 with carbs?
What block and what head would make a GREAT! conbination or engine or whatever. THANKS i'd apreshiate the help

 

i am running a l28e block (out of a 77). and a e-88 head (260z bigger valves) and S.U. carbs (3 screw 72) in a 81 280zx. so i think you could go the other way around, good luck and have fun!

the only problem i have heard of was having to run 50/50 trick fuel because of the higher compression and (engine pings), i'm not done yet but i will let you know if i run into any more problems. o and i havent run the engine yet so i done know if i will have this problem or not.

 

Check this site out, it talks about putting a L28 into a 240z.

VERY INFORMATIVE...

http://www.geocities.com/zgarage2001/z.html

From what I heard it all depends on how fast you want to go, a lightly modified L24 can pretty match or outperform a stock L28. If you just want a little more hp then IMO i would stick with the L24 and do some head work, ingition, headers, cam, trans, diff, etc, etc. BUT, it never hurts to have a little more torque with
the L28 ...

Also go to hybridz.org and look up the posts from a guy called normSU or somthing like that, he supposedly has gone 12 somthing (1/4 mile) with a L28 and SU carbs. Along with a few other mods.

Later,

Allen

 

Cool i've seen that page before and pretty much read it all already but it really does'nt answer my question. It helped alot to narrow the information i needed to know. but i'm not there all the way yet. i just want to know what BENEFITS and what PROBLEMS i would get out of swaping the F54 block and run it with carbs. thats pretty much it since i already know that the F54 was teh best of all engines. OHH!! and if i do swap the F54 and run it wit carbs would i need to make any mods. and if i can run the F54 head still ? THANKS for the help so far

 

The F54 is going to give you benefit of extra displacement over the L24 but it wont have the compression drawbacks of the earlier L28's due to it having flat top pistons. The P series heads also have large valves, a good combustion chamber design, and flow very well. And you can still run pump gas due to the fact that you have a streetable compression ratio. If you want a bump in power you can raise the compression ratio with a thinner headgasket or take a little off the head(not the best idea incase the head needs to be surfaced again in the future). The F54 was the highest output L series in the Z, but that was with the FI, so I couldn't tell you what to expect with carbs. But my guess is that you can expect a bit more power then the stock FI with proper tuning of the carbs.

 

I'm not the biggest gearhead, but I can tell you that I've got an L28 in my 72 240z (not sure what year) and its running great. I'm running dual webber carbs, & headers. I am pretty quick, but I don't know exactly HOW quick. But, since I get about 22-24 miles per gallon, I am a bit hesitant to change anything under the hood...

 

fuel economy is pretty much the name of the game these days. Unfortunately

 

Yeah i understand fuel economy is a BITCH! now on days... $3. 3? a gallon.... damn Arabs and their gas. :P O well.... beats having a V8 gas sucker huh? But ok what would run better then. 78 L28 or a 82-83 L28 ?

 

If they're both in like new condition then they're both going to run great. But the 82-83 engine is going to have more horsepower in stock form. (81 as well. Basically, the F54 engines were the highest output of the L's)

 

Althought the L28 in stock form makes more HP, you also have to consider it's doing that being fuel injected. The L24 is a good engine and has a lot going for it. My suggestion, stick with the L24, rebuild it and do some head work on it, then throw in some EFI. Get ITBs (individual throttle bodies) and MS&S, do the L28 distributer upgrade and run with it. I'll bet you'll be very happy and get great gas mileage.

 

Sweet! so i could run the F54 block with my l24 carbs. now the only thing in da way is for me to know what am i getting myself into, or better said. do i need to make any mods or make anything, change, replace, or add on when doing this swap.
THANKS SO FAR!

 

No, the swap is pretty straight forward. Everything bolts up the same, the only question comes in as what dist you're planning to run? Hopefully the 280Z/ZX dist so you can avoid the trouble plagued points system. Everything between the Z cars is interchangable under the hood.

 

i plan on running an L28 on carbs.. so i was adviced and i had previously thought of the F54 myself. so thats a given. an F54 on carbs. form the 81-83 280zx. and what trouble plagued points system. ? i'm not familiar with that.

 

points wear and the lose their accuracy as they wear. That means poor economy and performance. Thats trouble if you ask me. Of course if you change out the points on a proper schedule then it's not that big of a deal. But an electronic distributor doesn't usually tend to have any parts that wear out with the exception of the advance units (which usually last a very long time). So on top of being more accurate, an electronic iginition is typically a set it and foget it, forever, deal.

 

crane ignition also makes a changeover kit for our cars, blackdragon auto has them, i think there still in production, or recently put back into production, you can even get them from napa for bout 125 usd

 

so pretty much change the distributor system to an electrical. and check on the points

 

Chuck the points is more like it. You change the ignition to electronic and you no longer have points to worry about.