My custom intake mani, ka24/naps-z

1980-1986 Datsun 720 forums. All 720-specific topics and discussion can be found here.
seang
Posts: 2028
Joined: Tue Dec 16, 2008 8:09 pm
Car: Ford Fiesta ST
Location: Michigan

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Its not actual size, but the basic shape is all there. I think a Weber or Holley 2bbl would work good.[IMG][/IMG]


seang
Posts: 2028
Joined: Tue Dec 16, 2008 8:09 pm
Car: Ford Fiesta ST
Location: Michigan

Post

[IMG][/IMG]I think this one is better than the first. This one has runners of exactly the same length. The first one's runners are shorter at cyl's 2&3, and longer at cyl's 1&4, seemingly only slightly, the real thing would have different dimensions than the drawing, amplifying the difference even more. Anyhoo, I like this one better. For a stockish ka24 making peak torque at 4400rpm, the runners would ideally be 19.09 inches long for best resonance, but since this is too long, I divided it by half to 9.545 inches which I think could fit in the engine bay, and if thats still too long, I divided by three to 6.363 inch runners. The runners would ideally have an inner diameter of 1.5266 inches. Note that I said this was for ka24 or naps-z, but the naps-z24 makes peak torque at 2800 rpm, which would necessitate different runner sizes for best resonance, no biggie.PS, carb plate in drawing is cut (ideally) for 350cfm Holley 2bbl


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