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Here's a few of the tool I used. 1) 4.5" angle grinder 2) Die grinder 3) Misc. high speed grinding stones 3) Sanding rolls 4) Wire wheel for Dremel 5) Small grinding stones for Dremel 6) Safety glasses |
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Here's the before shot, you can see how much the bore ridge blocks airflow. |
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Here's another before shot showing how much material will be removed. |
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Tape off any area you don't want to grind with duct tape. I started removing the ridge with some grinding stones, but that was taking forever. So out came the 4.5" grinder. 10 min later the ridge was gone. I don't recommend this method for everyone, you can remove too much very quickly. |
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To radius the ridge and make for smoother flow, I use progressively finer sanding rolls on a die grinder. I started with 80g, followed by 100 then 240 to get out all the scratches. I then polished the bores with a dremel wire wheel. |
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In order to prepare the TBI for a injector spacer, clearance the underside of the TBI body with a high speed grinder where the fuel nuts screw into the pod. Grind off as much as you need to get your injector spacer in. |
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Here the throttle shaft before thinning. The shaft block a large portion of the bore reducing airflow. Tape the bores before you grind to avoid scratching them. Use a small high speed grinding stone in a dremel and be careful. The screws holding the blades on are TOUGH stuff so be careful and take your time. Definity wear safety glasses for this one. |
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Right side stock-left side thinned |