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 Write-Up: Building a Custom PVC Fenderwell Intake

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Supercharged
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PostSubject: 4' PVC intake   Wed Aug 20, 2008 12:39 pm

so i stole my brothers, i went to his new house in the riv behind his uhaul and got everything unloaded

this was lastnight on the highway, my brother asked me how the intake was and i didnt really know until he asked

i punched it and put it into 2nd joy that stock pulley was screamin, i cant wait til i get a pulley and PCM...im sold that the new intake has great gains even from a 3 inch
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PostSubject: Has anyone tried using a PVC bender for thier FWI?   Wed Aug 27, 2008 9:50 am

or maybe a heat gun? i figure a Straight peice of schedule 80 PVC line bent, would not only hold up better but perhaps the intake airflow would be even less restricted by not using thes bulky couplings, perhaps even alow for a 41/2 inch pipe lined with fire guard for insulation? what are your thoughts?
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Wed Aug 27, 2008 10:41 am

I think you will end up with a reduced inside diameter at the bends, if you can even do it.
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Wed Aug 27, 2008 11:00 am

anything above 3.5" inside diam is not really helping IMO. the TB is only so large, and the car can only take in so much air at a time. also there is very little obstructions at the couplings b/c everything fits flush inside.
also, i dont think a heat gun will be near enough to bend pcv. my intake gets really hot in 100* FL stop and go traffic. too hot to touch, maybe around 250*, and its not enough to warp the PVC.

my 4" FWI came apart the other day and i was running an open 4" pipe without a filter for a few miles. i lots power due to heat, and my throttle response was worse for some reason. even if it had been sucking in cold air i dont think i would have felt any difference than if it were connected to the filter...even at WOT. (i know, really not good for the motor to go WOT w/no filter)

i'm not trying to shoot down your idea, i dont know much about how a pvc bender works so maybe you can prove me wrong?
and what is this fire guard you speak of? is that like reflectix? (sp)

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1996 with 244k miles, L32á4" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs.
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Wed Aug 27, 2008 11:10 am

Get some intake tubing already man!

Whats that like the 3rd time its fallen apart? lol.
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Wed Aug 27, 2008 11:14 am

i have it pcv glued and taped at that joint. i just cut the center piece too short when i made it. so when i launch the car and the motor rocks back, it pulls it apart. but i think i have it fixed right this time (said that the last few times too)

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1996 with 244k miles, L32á4" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs.
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Wed Aug 27, 2008 11:27 am

you may have seen fire guard near heavy electrical traffic, like EMT Tubing and or ducting, its an orange fireproffing rubber that you cant paint on that is smooth to the touch, about a 1/4 inch thick. if painted onto the inside of said PVC, ti will cut the inside Diameter, down to 3.5" anyway, and with it, the inside of the pvc would be the same temp as the intake, even if the surface of the PVC was on fire. it is similat to pyroseal.
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Wed Aug 27, 2008 8:12 pm

I think I know the stuff you are talking about.

If its the same stuff we refer to it as innerduct.
We use it for conduit under roads and stuff when we make directional bores...

The PVC heater blanket will work very well for bending it.



Bert tavis
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Wed Aug 27, 2008 11:03 pm

BUT, what will that do to the ID at the bends?
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Thu Aug 28, 2008 8:27 am

dont picture a bend like if you were trying to bend an empty red bull can, picture a uniform bend like you would expect to see if pvc came straight from production with curvatures, the inside diameter change would be Minimal at worst. IMO slightly bent PVC with a small change in ID, would create less turbulance than 2 45 degree angles, because obviously, the shortest distance from point a ( your filter) to point B (your throttle body) is a straight line, the straighter you can make that line, the quicker and more efficently you can get outside air to cool your engine.
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Thu Aug 28, 2008 10:22 am

Lucas wrote:
dont picture a bend like if you were trying to bend an empty red bull can, picture a uniform bend like you would expect to see if pvc came straight from production with curvatures, the inside diameter change would be Minimal at worst. IMO slightly bent PVC with a small change in ID, would create less turbulance than 2 45 degree angles, because obviously, the shortest distance from point a ( your filter) to point B (your throttle body) is a straight line, the straighter you can make that line, the quicker and more efficently you can get outside air to cool your engine.

Another option might be to take a PVC "sweep" and use the heater blanket to make a slight bend in the sweep to make it fit.
The "sweeps" are used to gradually make a 90* bend, so picture a long 90...
Thats confusing as heck...

I think I would just use the rubber pipe that comes with the kit you can buy.
I had a similar set up on my GN and it worked great.
Bert tavis
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Sun Aug 31, 2008 8:23 pm

the silicone 3 to for reducer goes on the throtle body correct?
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Sun Aug 31, 2008 10:38 pm

SuperRiv07 wrote:
the silicone 3 to for reducer goes on the throtle body correct?

thats how i ran mine.

97 Buick Riviera Supercharged

pieced together myself for about $60.00 but i have a hook up at pep boys that gave me a discount, it would actuall run more like $120 but if your good with that here's what you need

1 - 4inch to 3 inch reducer for the throttle body
2 - 1 (45 degree) elbow
3 - 1 (20 degree) elbow
4 - 1 (90 degree) elbow
5 - 1 (6 inch) Straight
6 - whatever filter fits inside the fenderwell,

all pieces go together in that order, its a little cramped when you get to joining the 90 - straight and a little wiggling helps. And make sure you use the rubber gaskets that come with each piece to help reduce the risk of leaks.

set-up works great, car feels more responsive but its cool out today.
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Sun Aug 31, 2008 10:53 pm

SuperRiv07 wrote:
the silicone 3 to for reducer goes on the throtle body correct?

The TB opening is 3.5". So you'll need 3.5" to whatever ID tubing you're going to run to the FW. 3" won't fit on the TB, and 4" is too big for the TB.
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Sun Aug 31, 2008 10:59 pm

Jason wrote:


1 4" to 3" rubber reducer ......


I'm sure Jason meant 4 x 3.5 reducer, as the TB is 3.5"
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Sun Aug 31, 2008 11:20 pm

i see well I guess i should have measured cause i just went and bought the parts needed and i bought a 3 to 4 rubber reducer gues i will have to return it
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Sun Aug 31, 2008 11:22 pm

that looks nice as hell man but i only spent 25 bucks and got the pvc that i needed im a lil short on cash but when i get some i will build a custom stainless but for now im going with the 4 inch pvc
lyonsperformance wrote:
SuperRiv07 wrote:
the silicone 3 to for reducer goes on the throtle body correct?

thats how i ran mine.

97 Buick Riviera Supercharged

pieced together myself for about $60.00 but i have a hook up at pep boys that gave me a discount, it would actuall run more like $120 but if your good with that here's what you need

1 - 4inch to 3 inch reducer for the throttle body
2 - 1 (45 degree) elbow
3 - 1 (20 degree) elbow
4 - 1 (90 degree) elbow
5 - 1 (6 inch) Straight
6 - whatever filter fits inside the fenderwell,

all pieces go together in that order, its a little cramped when you get to joining the 90 - straight and a little wiggling helps. And make sure you use the rubber gaskets that come with each piece to help reduce the risk of leaks.

set-up works great, car feels more responsive but its cool out today.
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http://www.Chitownracing.com
SuperRiv07
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Sun Aug 31, 2008 11:36 pm

so i was looking over the photos of the pvc instal and my 45s ar a bit bigger, so my question is where did you buy yours i just went to home depot and got what the had in the plumbing section so let me know so i can return what i got and get the right shit before i start and then realize it aint gonna work and then im stuck with shit and out my money
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Tue Sep 02, 2008 12:41 am

You just have to shop around at some hardware stores to find pieces you like, if their appearance is important. Lowes, Home Depot, etc. Look in the Yellow Pages under hardware stores?
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Tue Sep 02, 2008 8:45 am

yeah true Im sorry to sound pushy im just excited about starting another project with my riv
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Tue Sep 02, 2008 9:00 am

No problem, I know where you're coming from. It sucks that no one sells a FW intake designed to bolt right in on our Rivs. I have the same problem with my 68 GS350, basically 2 vendors exist to source any perf parts from, and they mostly cater to 455 cars, the Buick 350 gets the shaft most of the time.
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Tue Sep 02, 2008 9:13 am

yeah it does suck but shit half the fun of working on cars is building custom shit
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Tue Sep 02, 2008 9:14 am

i just wish there were other people that lived by me to come over and we could make a day of customizing our rivs
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Tue Sep 02, 2008 9:34 am

Tell me about it.... I don't know any other Riv owners locally. But there is a local W-body group I've been involved with a bit. Truth is, there's so much help readily available here that it really simplifies working your way thru mods by yourself. If you get stuck, ask for help. Lots of us are online throughout the day/evening.
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PostSubject: Re: Write-Up: Building a Custom PVC Fenderwell Intake   Tue Sep 02, 2008 9:50 am

yeah thats true Im always loged in and usually home and when im not Im on line on my laptop in the car
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