z24I Intake

[dongatta]

Hello all. I am new to the forum. I have a 86 d21 with the z24i. I was wondering if anyone knew the dimensions of the bolt pattern on that particular intake. I would appreciate any help.

[seang]

Sorry, I'm not sure of that exactly. Are you thinking about making a custom manifold or something?

[dongatta]

Yes I am thinking of switching to a carb. Redline thinks they have a intake adapter that will fit or can make one. Just needs some measurements to be more accurate

[jbracy7]

1.remove intake,2. take measurements 3. send measurements to red line

[longtooth]

The webber carbs have a bigger spread bore than the thottle body injections. There has been a mod done on this. Here is the link.
z24i-efi-tbi-to-weber-carburetor-conver ... 35279.html

I am going under the assumtion that tbi has the same measurements as the 86 carb. However the concept of making your own plate would be the same.

[jbracy7]

why would want a carb,just askin i dont see any gains from this type of custom work

[dongatta]

The webber carbs have a bigger spread bore than the thottle body injections. There has been a mod done on this. Here is the link.
z24i-efi-tbi-to-weber-carburetor-conver ... 35279.html

I am going under the assumtion that tbi has the same measurements as the 86 carb. However the concept of making your own plate would be the same.

Thanks for your post. I am no mechanic so don't quote me. I have read the post above and it gives me some positive input. I was hoping that guy who did the mod would chime in. I tried to send a private message but it stated he wasn't taking private messages. The truck is at a shop a good distance from me and I was hoping someone knew the measurements without a great deal of research.

[dongatta]

why would want a carb,just askin i dont see any gains from this type of custom work

From the headache I have had with this truck and from what I have read I can do away with the expensive electrical tbi parts. The techs at Redline also state that doing away with the tbi elelectronics I can save on parts.

[jbracy7]

thats a good reason

[Frankie Pintado]

Sorry for the delay.

As of the time I did this to my truck, there was no adapter plate made by Redline. Redline was not aware that this swap was even possible, and could give very limited-no advice.

You have four choices that I know of.
1. Get an intake manifold from a z24 (stock-carbed version of the z24i)
2. Drill ant tap 2 holes in the manifold you have now, then use the adapter plate that comes with redline's z24 kit. This is what I did.
3. Make your own adapter plate out of the stock mixture heater (that honey-comb thing under the tbi). Another nicoclub member figured this out and I probably would have done it if I'd thought of it.
4. If this all seems like more than you are willing to attempt, you can take the intake and the carb to a machine shop and they can easily make a perfect adapter plate. I doubt that it would be expensive.

I will allow personal messages. I did not realize I couldn't take them.

[dongatta]

Hey thanks. I thought you had forgot about this thread. I think I will take the mixture heater to a machine shop and have an adapter plate made. one question is which carb should I buy

[Frankie Pintado]

I say go with the big one (the 38). I've never cared for the progressives (32/36). Those progressives can be found on many old VW buses, and the occasional Bug. I'm really into the old aircooled VW's, that's where I got most of my background with carburetors and if you ask me or most any other old dub mechanics, they'll tell you to get a straight 2-barrel, not a progressive. Plus, if you ever want to throw a high performance cam in there, the 38 is good to go. That's my 2 cents. Price is so close it really shouldn't be a factor.
There are some people out there who've put the progressive on the z24i now and claim great success. I've only messed with them on VW's. I have a pretty new one sitting in my shed right now that the owner of a '72 bus engine I'm building bishez about constantly. Another buddy of mine took an old one off of his '78 bus and preaches nothing but contempt for it. He's running a dual Solex setup now that kicks serious butt.