TheBetterMethod Posted December 3, 2011 Report Share Posted December 3, 2011 Hey guys, I'm in the planning stages of my next build and I'm trying to find a 7 inch diameter pipe or tube that I can use as a port. I'm looking at a box that's about 3.8-4.1 cubic feet after displacement. It's for 2 12s. and I want it tuned to 30 hz. The problem is that standard pipe sizes are 6in. or 8in. And if I use 6in. there won't be enough port area (>8in./cube). And if I step up to 8in. the port area is a little too high and the port would be very long (13.5/cube @ 30in. long). So it seems that 7in is the perfect compromise. Except that no one seems to make it. So does anyone know of a source to get 7 inch tube or pipe? It would make this build so easy. Thanks, TheBetterMethod Quote 2005 Subaru Outback Wagon Pioneer 9400BH Fi Q 15, SAZ1500dV3 The first build>>> http://www.stevemead...-outback-build/ 140.9 @ 36hz Sealed on dash! REBUILT!!! 2 Fi Q 15s, 2 SAZ1500dv3 146.9 @ 39hz dBDRA certified Link to comment Share on other sites More sharing options...
Namosh Posted December 3, 2011 Report Share Posted December 3, 2011 The inside diameter of 8" schedule 80 pvc is about 7 1/2". Would that be close enough? Quote My Ram Quad Cab Blow-through Link to comment Share on other sites More sharing options...
FroznBeavrBALLs Posted December 3, 2011 Report Share Posted December 3, 2011 thats not much port area. u want ~10sq inches of port. thats what a 7inch round port would be... Quote 2 DC 12" lvl 4s 1 DC 1.2k XS Power S3400 big 3 Alll KNU wire Pioneer HU cheapo Legacy coaxes (just for now) http://www.stevemead...n-sentra-build/ Link to comment Share on other sites More sharing options...
TheBetterMethod Posted December 3, 2011 Author Report Share Posted December 3, 2011 I looked at the schedule 8*0 and the ID would be fine but the OD is very big and takes a lot of box volume, plus that stuff weighs about 8lbs/ft. Since the port would be about 27in. long that would make the port about 20lbs. And I think I would have trouble heat forming flares on the ends of schedule 8*0. As for the area I want. It's going to be an aero port so from what I understand 9-12 per cube is ideal for daily. I may be wrong. But a 7in. ID schedule 40 would be ideal for it's ID and OD and the length per 30hz tuning. But I can't find any. Thanks for all your input guys! Quote 2005 Subaru Outback Wagon Pioneer 9400BH Fi Q 15, SAZ1500dV3 The first build>>> http://www.stevemead...-outback-build/ 140.9 @ 36hz Sealed on dash! REBUILT!!! 2 Fi Q 15s, 2 SAZ1500dv3 146.9 @ 39hz dBDRA certified Link to comment Share on other sites More sharing options...
STEvil Posted December 3, 2011 Report Share Posted December 3, 2011 Go to local large hardware/construction store and get some cardboard tube (its used for cement piling forms), then just resin it. Or go to an irrigation company that supplies parts for center pivot irrigation. They usually stock or can point you to someone who does stock large diameter pipe and its a lot cheaper through them usually since they are bulk carriers. Quote MickyMcD - "Capable of making some serious trouser flapping volumes at where's-my-testicles frequencies, the Servo-Drives used to be fairly jaw dropping..." Any time you have have a power wire next to your frame put some rubber hosing (or cut up an innertube) around it. The wire is bound to wiggle (due to driving or flex) and the casing will eventually wear through. Hammerdown... 1% no links to outside websites, business related FB/YT pages allowed. Link to comment Share on other sites More sharing options...
TheBetterMethod Posted December 3, 2011 Author Report Share Posted December 3, 2011 COOL! Thanks for the info. I looked for cement forms and couldn't find the right size, but I'll keep looking. And I'll check on that irrigation thing too. Quote 2005 Subaru Outback Wagon Pioneer 9400BH Fi Q 15, SAZ1500dV3 The first build>>> http://www.stevemead...-outback-build/ 140.9 @ 36hz Sealed on dash! REBUILT!!! 2 Fi Q 15s, 2 SAZ1500dv3 146.9 @ 39hz dBDRA certified Link to comment Share on other sites More sharing options...
STEvil Posted December 3, 2011 Report Share Posted December 3, 2011 take a tape measure when you go for the cement forms, they're not very uniform sometimes lol.. makes you kind of wonder about the footings under some buildings Quote MickyMcD - "Capable of making some serious trouser flapping volumes at where's-my-testicles frequencies, the Servo-Drives used to be fairly jaw dropping..." Any time you have have a power wire next to your frame put some rubber hosing (or cut up an innertube) around it. The wire is bound to wiggle (due to driving or flex) and the casing will eventually wear through. Hammerdown... 1% no links to outside websites, business related FB/YT pages allowed. Link to comment Share on other sites More sharing options...
bass28 Posted December 3, 2011 Report Share Posted December 3, 2011 Go to local large hardware/construction store and get some cardboard tube (its used for cement piling forms), then just resin it. Or go to an irrigation company that supplies parts for center pivot irrigation. They usually stock or can point you to someone who does stock large diameter pipe and its a lot cheaper through them usually since they are bulk carriers. Agreed i have seen the cardboard ports used and they work great. He had two 18s with 2 10inch ports and damn did it move air. But he had the mags faced up. Quote Link to comment Share on other sites More sharing options...
Watch the bass Posted December 3, 2011 Report Share Posted December 3, 2011 Long years ago i used something like this as pipe, worked well. Quote "in the abundance of water, the fool is thirsty" Bob Marley Link to comment Share on other sites More sharing options...
TheBetterMethod Posted December 3, 2011 Author Report Share Posted December 3, 2011 Thanks for all the replies fellas! I still can't find the 7in. cement formers, and the search I did for irrigation pipe was fruitless. I came across the stove pipe a few days ago, and thought about it. Since you had good luck with it maybe it would be worth a shot. Thanks a bunch! Quote 2005 Subaru Outback Wagon Pioneer 9400BH Fi Q 15, SAZ1500dV3 The first build>>> http://www.stevemead...-outback-build/ 140.9 @ 36hz Sealed on dash! REBUILT!!! 2 Fi Q 15s, 2 SAZ1500dv3 146.9 @ 39hz dBDRA certified Link to comment Share on other sites More sharing options...
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