molding an intake tube

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kenzo42

Member - Posts: 6

Joined: April 02, 2004

Location: United States

Posted: July 10, 2007 at 3:25 PM / IP Logged

I plan to make an intake for my car using fiberglass. However, I can't figure out the best way of making a mold to lay the fiberglass upon. Any suggestions? Urethane foam? Thanks.

sliptap

Member - Posts: 15

Joined: May 31, 2007

Location: United States

Posted: July 10, 2007 at 5:02 PM / IP Logged

kenzo42 wrote:

I plan to make an intake for my car using fiberglass. However, I can't figure out the best way of making a mold to lay the fiberglass upon. Any suggestions? Urethane foam? Thanks.

You mean like a cold air intake?

kenzo42

Member - Posts: 6

Joined: April 02, 2004

Location: United States

Posted: July 10, 2007 at 8:18 PM / IP Logged

Yes, a cold air intake.

e36rok

Member - Posts: 18

Joined: May 23, 2007

Location: Canada

Posted: July 10, 2007 at 8:30 PM / IP Logged

What car is this for? If it's a cheap car you're probably better off buying one since they are ~$200 for cars like civics. Actually even for an expensive car, you don't want a crappy CAI in an expensive car. Come to think of it, you're probably better off buying one for ANY car seeing as how a fiberglass CAI will be inferior to one made from mandrel bent tubing... good luck either way.

jmelton86

Gold - Posts: 1,228

Joined: February 07, 2007

Location: South Carolina, United States

Posted: July 10, 2007 at 8:50 PM / IP Logged

Plastic tubing is Far better than aluminum or any other metal, really. It doesn't conduct heat so much -allowing for 'denser' air which allows for better power and fuel economy.

I built a custom one for my 95' Cavalier as Napa where I work doesnt offer them for my car(I don't see the point in buying one when I could 'rig' one). I took 2 different ones from the trash (no shame at all!) and cut each down so it'd go where I wanted. I then use the adapters that came with them and routed it correctly. I plugged off all holes I didn't need and ran the PVC/breather hose and AIT sensor to holes already there. They are aluminum. -Because they are 2 separate pieces with rubber adapter in between, the one attached to the intake manifold stays Much cooler than the first one, which keeps me happy. I got a K&N filter to fit it, courtesy of RTV silicone.

Just an idea.

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dpaton

Copper - Posts: 141

Joined: July 19, 2004

Location: United States

Posted: September 03, 2007 at 6:08 PM / IP Logged

Unless you're running it near the exhaust manifold, just make it out of PVC. Less heat transfer, crazy easy to build, and reasonably reliable. If you don't like the look, then 'glass over it, but for the core, use PVC.

This is not a sig. This is a duck. Quack.

jmelton86

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Joined: February 07, 2007

Location: South Carolina, United States

Posted: September 27, 2007 at 1:58 AM / IP Logged

As long as no point in the tubing has a smaller diameter than the intake diameter (where the tube connects to the throttle body) then it's all good.

2013 Kia Rio -90a alternator

DDX470HD GTO14001 GTO1014D (x3)

Big3 in 1/0G

1/0G to GTO14001

mr beta

Member - Posts: 17

Joined: October 22, 2006

Posted: September 30, 2007 at 12:33 AM / IP Logged

Doesn't PVC give off toxic fumes when heated to high temps?

CapSS92

Copper - Posts: 51

Joined: August 25, 2003

Location: United States

Posted: October 01, 2007 at 4:10 AM / IP Logged

I agree. If you just use fiberglass, it's gonna fall apart.

dpaton

Copper - Posts: 141

Joined: July 19, 2004

Location: United States

Posted: October 01, 2007 at 6:12 PM / IP Logged

mr beta wrote:

Doesn't PVC give off toxic fumes when heated to high temps?

Yup, but as long as it's not close to the exhaust, it's fine. The pic I posted is my engine bay, and it's been that way in 120 degree days in full sun for hours at high speed. The PVC never got warm enough to deform, which is around the same temp that the nasty fumes get released.

This is not a sig. This is a duck. Quack.

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