i have a nissan/datsun 720 with a nissan z24 carb motor, with 8 spark plugs. i want to put a fuel injected z24 intake manifold and head out of a 240sx on the motor. can i just swap out the distributors or will there have to be internal modifications to the motor?

The 240 sx never came with a z24 motor. The early ones had a SOHC ka24e, and the later ones had the DOHC ka24de. I personally had a TBI version of the z24, and there wasn't a lot to do to it as far a tuning goes, I would rather have a carb. Your tunability options are better with a carburettor setup, like with a weber downdraft. The benefits of fuel injection tend to be exaggerated sometimes.

I have heard of people doing it. I have not seen it in person but the theory is good.

well i have just got into the nissan world and dont know much yet. im mainly a domestic/american muscle guy. the motors looked the same from the outside. are any of the parts interchangeable? im not looking for performance, more or less better economy. plus a webber carb cost me 300 bones and i can get that whole ka24e motor for 300.

It depends on the condition of the ka24e. If its all good, then its probably worth the money. The ka24e needs an ECU, and it also needs a different fuel pump, (if it will even fit in the stock tank), for the EFI system. Maybe a Walbro inline pump would work as well? As far as the weber carb goes, maybe you could find a good used one somewhere. The best economy will be with the 32/36. The 34/34 is better for performance. Either one will flow enough.

ill be getting the ecu with the motor. do you know any places to get a used webber carb.

Well, if it comes with the wiring harness, ecu, its probably worth it. the ka24e I mean. If you're to stick with the z24, and want a good used carb, you will have to do all the homework yourelf because I'm not gonna spend two hours (est.) searching the earth for your weber carb, but I feel confident that if you look enough, you will find one.

well thanks for the help i have done some research and the head and block pattern from the ka24e and the z24 are the same. im going to try for the head swap and if all else fails then ill go back to get the block, rebuild it and just stick that one in there. in the mean time i think ill look up a good carb too just as a back up plan.

does anyone know if the ka24e head will bolt to the z22 block. if so i've got a ka parts engine/ecu/harness in my garage and an 82 z22 720 that would love to see that put on it.

edit*disregard. i found on here that you can. correct if incorrect information was given before i get into this
Modified by rodmod720 at 10:17 AM 4/28/2009

mcrdpisc2086 wrote:ill be getting the ecu with the motor. do you know any places to get a used webber carb.

Webers are a dime a dozen...look at your local CL listings. Get a DGAV 32/36 and rebuild it.

rodmod720 wrote:does anyone know if the ka24e head will bolt to the z22 block. if so i've got a ka parts engine/ecu/harness in my garage and an 82 z22 720 that would love to see that put on it.

edit*disregard. i found on here that you can. correct if incorrect information was given before i get into this

Modified by rodmod720 at 10:17 AM 4/28/2009

Personally, I think a ka24e head on a z22 is not the best idea. z22 cranks are good for l20 blocks to make a l22. Phlebmaster should put that in his truck.

seang wrote:Personally, I think a ka24e head on a z22 is not the best idea. z22 cranks are good for l20 blocks to make a l22. Phlebmaster should put that in his truck.

Already in the works

seang wrote:Personally, I think a ka24e head on a z22 is not the best idea. z22 cranks are good for l20 blocks to make a l22. Phlebmaster should put that in his truck.

reasoning behind the not good for my truck please

Because the z22 has less compression than the ka24e, (assuming you have stock pistons). z22 has 87mm bore, 92mm stroke and 8.5:1 compression ratio, ka24e has 89mm bore, 96mm stroke, 1989 and some early 1990 240sx versions had 9:1 compression ratio, 91-97 ka24e's found in pickup trucks had 8.6:1 compression ratio. The smaller bore of the z22 is gonna fall short of the combustion chamber volume, thus lowering static compression. The only advantage of the z22 to the ka24e is the FULLY COUNTERWEIGHTED CRANK. Maybe if you bore it out 2mm so the pistons match up to the chambers, but I'm not sure it will even then. your idea is a new one, so you might have to try it and let everyone know for sure how that combo works, because I have not done this mod, and can't say firsthand.

mcrdpisc2086 wrote:i have a nissan/datsun 720 with a nissan z24 carb motor, with 8 spark plugs. i want to put a fuel injected z24 intake manifold and head out of a 240sx on the motor. can i just swap out the distributors or will there have to be internal modifications to the motor?

To answer your origional question, I'm pretty sure the distributors won't just swap out with one another. I THINK they need the intermediate shaft from the motor the dizzy came from. but this is from memory.

seang wrote: To answer your origional question, I'm pretty sure the distributors won't just swap out with one another. I THINK they need the intermediate shaft from the motor the dizzy came from. but this is from memory.

you realize that those questions came from two different people right?anyway, i'm going to do alot of research on the differences and what i can do to accomodate them before i make a move on that kind of a project. i enjoy doing things that i've not seen before. it keeps me sharp. i thank you for your input and information though.

well i think that im goint to try it. ill bore it out to match the larger chambers of the ka24e. witch cam was bigger the z24 or the ka24e? well ill do some machine work and see what comes of it. if all else fails then ill just put the ka24e motor in the truck with the original truck 5 speed. if one of you finds out first then let me know.

the z24 has the same bore and stroke as the ka24 (89mm X 96mm). The z22 has the smaller bore. Pistons and rods are actually interchangable in sets from the z24 and ka24. As for the cam, the ka24e has a 3-valve head and z24 has just two per cylinder, I'm not sure if the cams will match up, but it would be crazy if it did fit.

Let us know how they compare side by side.

The bottom ends are basically the same. I just wish the napz24 head was a better performer like the kae head.

well i am goint to try to do the head swap. does anyone know what emissions i can remove on the z24 and still keep the motor running, good. there are so many damn vacume lines and stuff that i just want to remove. i did it with my 2.4L mitz motor but that is a mitz and not a nissan.

mcrdpisc2086 wrote:well i am goint to try to do the head swap. does anyone know what emissions i can remove on the z24 and still keep the motor running, good. there are so many damn vacume lines and stuff that i just want to remove. i did it with my 2.4L mitz motor but that is a mitz and not a nissan.

I took off all the emission s***, just grab a haynes manual from autozone and make sure you dont disturb the vacuum lines pertaining to timing and fuel vapor can. I capped the pipes coming from the exhaust as you can see in the pic that was the cause of much back fireing when i got the truck all fixed now. . . i have a header that i need to install just been saving up for a good exhaust system to go with it tho.