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moelk

Triple carb airboxes/heat shields

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Hi!

Im thinking of installing an airbox or an heat shield (haven't decided yet) on my Triple carb setup and wanted to see your solutions and what (if any) difference it made.

IMG_9923.JPG

 

//Andreas

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Getting the right amount of air to all three carbs using an airbox that hasn't been designed to do so could cause performance issues and lead to engine problems due to A/F ratios.

If you look at the ITG fiberglass or CF boxes they have a taper to them that speeds the flow up as it moves towards the rear carb. A non-tapered box could end up having you jet each carb differently. Depending on the box you would need to select a shorter velocity stack.

A foam full length ITG filter out performs the ITG box (based on dyno runs@Rebello's shop).

I have my headers heat resistant powder coated (inside & out) and use an under tray heat shield as well. The street and race cars both have louvered inspection doors and you can feel the heat coming out.

Signed,

an ITG foam filter guy for 15yrs on street and race car 240Zs

 

Edited by gnosez
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If you jet without an air filter, then add  one that  is restrictive, it  will act like an old fashion choke and move the manifold vacuum further up the throat of the carb and cause richness.

 

Make sure your filter flows freely and check a/f after adding.

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I did not notice a disparity between my cylinders because of my non tapered box. I think the capacity was enough not to choke air volume to any cylinder . 

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2 hours ago, madkaw said:

I did not notice a disparity between my cylinders because of my non tapered box. I think the capacity was enough not to choke air volume to any cylinder . 

I'd also question how much dyno R+D was done on the tapered box...... bet it was equal to not much at all. 

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I had the FG version for several years and put the ITG foam filter back on after Dave Rebello told me he had recently dyno'd two identical engines build for the same guy and the one with the foam filter had more HP. Dave was surprised by the results.

As to the questioning of how much R&D went into it I suggest you contact them and ask. A quick look at say air ducting for an office building and you see how the duct size decreases the further away the outlet is from the source of the inlet air. Of course there are reference charts and modeling one can do.

And there are people who buy a V12 with carbs just to hear all the intakes open....

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I plan for on having a few dyno runs this spring/summer. I’ll circle back around once completed. Dave completed my build end of last year at 318 HP. It will be interesting to compare his dyno with a couple runs with horns and then through the airbox. The air box did choke it down some when I installed it. I did have yo open my air mix screws to regain my AFR setting at idle. I dig in s little deeper this summer with my settings

 

 

Sent from my iPhone using Classic Zcar Club mobile

 

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