The Holly 2300 is a Holly carb of about 350 CFM and (I think) a bit too large for a 2.4 liter engine. This is a small V8 2bbl carb. It also comes in 500cfm. It also opens both barrels together so you would have to step into it gradually rather than flooring it.
The Holly 5200 is a licensed copy of a Weber 32/36 carb but has Holly jets in it. If you have one it's from a Vega or Pinto and likely 30 years old rebuilt 3 or 4 times with missing parts, and what is there may be worn out.
The Weber 32/36 is the way to go. But buy a new one, not someone else's problem. I heard the 32/36 is about 270 cfm which is about right. Additionally the Weber is a progressive carb with the secondary coming starting after the half way on the throttle.
ok ok sorry, actually the carburetor tell me the mechanics in mexico is a ford motorcraft 2150 (1.08) venturis (287 cfm) unless you have the engine ported and aggressive cam shaft This uses two synchronized butterflies what I want is to go with holley 5200 economy
Any have any experience with these on the GT (Motorcraft 2100/2150)? Pulled one out of a junkyard and wanted to toy around with it. This one is the 1.08 (287 CFM). Looking for tips on this for fun, not as a replacement for the Webber 32/36. Already have a holey flange on this intake.
The Z24 displaces about 145.6 cu in, so if we assume a top RPM of say 6K and it takes two revolutions to complete one four stroke operation then divide by 2 to get 3000 actual 4 cylinder fills per minute or 436,945cu in per minute. A cubic foot is 1728cu in so we divide to get 252.8 cubic feet per minute. You would need a carb capable of allowing at least this amount. I think the 32/36 is rated at about 270cfm. The stock Z24 Hitachi is very restrictive and most who switch to the 32/36 notice an improvement.
i have this holley 5200
I have a datsun l20 engine 521 carburetor maybe this is for this
I also commented toyota 22r carburetor but I do not.
I see that in the US all use webber in z24 so my question is do you recommend
this is a web page search ----------------A 2.4 liter engine at 6500 rpm is pumping 274.5 cfm, assuming 100% volumetric efficiency. In reality, most motors are at around 80%. So 274.5 x .8 = 219.6 cfm. This is the ballpark, so yes, a 350 would be a little too big, but there are smaller Holley 2bbls, as well as other brands. I guess I could run a weber on there, too, or even dual 1bbl webers. One other carb I have in mind is a Ford Motorcraft 2bbl with 1.08 venturis, which flows about 275 cfm.
Oh, yeah the formula for flow rate is;
(cubic inches) x (rpm) % 3456 x .8 = cfm at 80% VE.
*Note* Some racing engines with radical cam profiles can exceed 100% volumetric efficiency at certain rpm's because everything is tuned so well.
I like your math!
However it's unlikely a Z24 will ever get much above 5K.... and be making any usable power (that is) The stock head is way too restrictive for this. It was built for low speed grunt and at that it is superb. A 'larger' carb will help slightly as IT is less restrictive and the engine does not have to work as hard sucking air through it. But then you are back to the next limiting factor which is the head's ability to breath at high RPMs.
To keep piston speed below 4000 ft / min the redline on a 96mm stroke Z24 engine should be kept to below 6,300. Above 4K ft/min the rod bolts, rods and pistons and the rings are extremely stressed and if not break ,they stretch, hitting the bottom of the head.
An older 86mm stroke L20B is safe to 7K
An even older 73.7mm stroke L16 is good to 8,200