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The Terminator
Engine/Tuning
Got bored today-2.9 Whipple inlet mod
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<blockquote data-quote="RPM4DAZ" data-source="post: 13527509" data-attributes="member: 54154"><p>Great job by the way. You look like you have some experience in fabrication... As for the idea of "swinging the throttlebody out to clean up the angle of attack and try to help the short side radius. Well, I think you may run into more problems to engineer around than the increase may make. I do have a suggestion for the next one though. Install one or two turning vanes in you tunnel assembly. Even though the inlet is under vacuum rather than pressure, all the air wants to fall or collect at the outer wall. A smoke test in a lab would show this. By installing a couple of turning vanes, you increase the back wall area 2 or 3 times. This will help shift/spread volume more across the whole cross section and outlet port area. You could also increase the height of the tunnel at the small ( short side ) radius. Kind of like a trapezoid cross section. This would increase the area on the low speed ( short radius ) wall, along with a lower pressure area. Air flow follows into low pressure and around high pressure areas. I hope this makes sense. I sometimes have a hard time explaining what I want to get across. If you have access to a flow bench you should see a gain in CFM flow. It would actually work better as draw/vacuum was increased of course. Edit; Also, you could use some 100-120 grit sand paper across ( running vertically when installed in place ) before you install your back wall. The small light grooves helps to keep the boundary layer low/thin. That helps in increasing the actual or working cross sectional area. You do it on the roof and floor also, but I doubt it would help as much as the outer/high speed radius. Just make sure the air flow goes across the sanded grooves not along with them...</p></blockquote><p></p>
[QUOTE="RPM4DAZ, post: 13527509, member: 54154"] Great job by the way. You look like you have some experience in fabrication... As for the idea of "swinging the throttlebody out to clean up the angle of attack and try to help the short side radius. Well, I think you may run into more problems to engineer around than the increase may make. I do have a suggestion for the next one though. Install one or two turning vanes in you tunnel assembly. Even though the inlet is under vacuum rather than pressure, all the air wants to fall or collect at the outer wall. A smoke test in a lab would show this. By installing a couple of turning vanes, you increase the back wall area 2 or 3 times. This will help shift/spread volume more across the whole cross section and outlet port area. You could also increase the height of the tunnel at the small ( short side ) radius. Kind of like a trapezoid cross section. This would increase the area on the low speed ( short radius ) wall, along with a lower pressure area. Air flow follows into low pressure and around high pressure areas. I hope this makes sense. I sometimes have a hard time explaining what I want to get across. If you have access to a flow bench you should see a gain in CFM flow. It would actually work better as draw/vacuum was increased of course. Edit; Also, you could use some 100-120 grit sand paper across ( running vertically when installed in place ) before you install your back wall. The small light grooves helps to keep the boundary layer low/thin. That helps in increasing the actual or working cross sectional area. You do it on the roof and floor also, but I doubt it would help as much as the outer/high speed radius. Just make sure the air flow goes across the sanded grooves not along with them... [/QUOTE]
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Got bored today-2.9 Whipple inlet mod
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