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Part 6: Hood Blower (Fresh Air) Scoop
Any respectable gasser MUST have a Hilborn 4-hole blower injector scoop sticking way out of the hood. Unfortunately, I can't afford a blower so I did the next best thing; I installed the Hilborn scoop as a fresh air scoop. The photo below shows the installation and my simulated Hilborn 4-hole injector. The scoop bolts to the 'injector' and the injector bolts to the hood.


(Click photo to enlarge)


The next picture shows the underside of the hood, confirming that it is an honest-to-goodness fresh air scoop.


(Click photo to enlarge)


The key to this project is the imitation injector. I sand cast it in aluminum from a home made mold. The picture below shows the pattern I made from wood, ABS pipe, and Bondo. It is exactly half an injector body on a flat board. There is a pin in one end of the board and a like hole in the other end.


(Click photo to enlarge)


The picture below shows the sand boxes I made that have matching holes and pins that intersect the pattern and each other.


(Click photo to enlarge)


The picture below shows one of the box halves fitted on the pattern, ready to be filled with mold sand. Once both boxes are packed with sand, they are assembled to each other and there is a resulting cavity that is in the exact shape of the injector body. If molten aluminum were then poured in, it would be a solid slug with no holes.


(Click photo to enlarge)


The picture below shows a 'core' mold, which is an ABS pipe with wooden dowels glued in. Casting sand is packed into this pipe, and when 4 are made, the sand cores are fitted into the previously made sand box halves. Now the aluminum will form the thin-walled injectors tubes as desired.


(Click photo to enlarge)


The next picture shows the cutoff of the tail of the injector and you can see the parts of the casting; outer body, core hole and bolt bosses.


(Click photo to enlarge)


Click here for Part 7: Induction System


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