Is it possible to use high density foam instead of mdf if you are fiberglassing over it anyway? I want to do a nice layout in my trunk but dont want the massive ammount of weight. Any thoughts?

best time so far 14.3 @ 101.1mph(no traction)
fastest 2GNT with a hitch! until proven wrong...

RIIIIIIIIIIIIIIIIIIIIIIIIIGHT
sorry...
You can always try, but foam will soak up the fiberglass and youll need to use a lot more of it, and it will not be a strong back to hold any subwoofers or any other item. You can try, but I would expect not so good results.


Undergoing MAJOR modifications, inside and out: Sneek peek at phase 1 shown
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The foam I would use is actually pretty rigid and with glass to support it it makes it very strong. They actually use foam with fiberglass to build race boats and they take more abuse in the ocean than a woofer could put on a box. I was just wondering if anyone has tried it??

best time so far 14.3 @ 101.1mph(no traction)
fastest 2GNT with a hitch! until proven wrong...

I think you should see how it works, I know about the foam they use on boats but i dont remember all the properties it possesses. There is a boat manufacturing facility in my town, ill see if one of my friends could bring me some of it. id still make sure that u mount your subwoofers into at least an mdf ring.

i asked my coworker about it (he used to work for that company), he says that it would work fine, possibly even better then wood. He is also emailing one of his buddies that works in management there to get his opinion on it, the name of the material and maybe getting me a sample.

Ill post when i get more information.

-Gabe-

Sounds good. Thanks for looking into it. This would save massive amounts of weight

best time so far 14.3 @ 101.1mph(no traction)
fastest 2GNT with a hitch! until proven wrong...

They don't use the foam to back the fiberglass in racing boats for structure, they use it for flotation. They build those hulls then fill the gaps with expanding foam which seals them off from all water and makes the boat virtually unsinkable.


If you lay fiberglass onto foam there's a big chance you are going to melt the foam during the curing process. Foam generally doesn't like any kind of chemical interaction. Hell spraypaint will melt styrofoam.

I say brush some resin onto the top of the foam and see if it will harden normally, if it does, it will be solid and a great alternate light weight base material.

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

a_miller you're wrong. They do use the foam as fillers and sealers as u said they did, BUT they also use types of foam for structural uses. I will get u the specs on it. My coworker designed boats for Cobalt Boats for 6 years. I think he would know what he is talking about. I will get the specs, I will get the proof, I promise this.

-Gabe-

edit: here is a list of suppliers listed on boat design forums. Ill still get the info on the stuff they use at Cobalt Boats.

http://boatdesign.net/forums/showthread.php?t=368&goto=nextnewest

Well i stand corrected

Aaron - sorry, didnt mean to sound like an ass bud.

I would really like to see this done. Hopefully by someone who has used mdf. That way we can have a comparison on ease of use, strength, weight savings, cost and so on. maybe when its all said and done maybe mdf is still the way to go.

-Gabe-

Well homedepot has pink foam that is used to insulate homes you can get a pretty large sheet for 14 bucks. As far as resin goes I will not be using polystyrene. I will use a 2 part epoxy. It is buch stronger and has almost no fumes. Foam is used on race bots for structual purposes. You could make a boat out of cement wiht no foam and it would float the foam has nothing to do with it.

best time so far 14.3 @ 101.1mph(no traction)
fastest 2GNT with a hitch! until proven wrong...

You are correct I was under the impression that you said boats needed foam to float.

best time so far 14.3 @ 101.1mph(no traction)
fastest 2GNT with a hitch! until proven wrong...

thats how they make surfboards too. should work well.

-jason

At home depot, they have stuff called "great stuff". I used it to keep the shape of the footwell when making a box for it. This stuff works very well, very lightweight, but it's VERY messy and you DO NOT want to get it on fabric, it doesn't come off vry well. But it is very lightweight, hardens strong and you can glass over it. If ya have any questions about how to use it or anything, PM me or somethin, i've been through the process with it a few times and know how to use it.

interesting. just make a cube of foam, coat it with resin, poke a hole in it and pour gasoline in there. voila!!! LOL.

anyways, we may have a new sub box standard, yes?

Having Problems? Heres my Three step solution to anything 2gnt related.
Step 1: Put down everything in your hands.
Step 2: Grab a lucky strike, Smoke it.
Step 3: Walk to the fridge, double fist some keystone ice, sit down in the shade, drink one beer, finish cigarette, drink other beer, roll a joint, smoke it, walk back to your problem, and in about 5 minutes the solution will come to you.
If not. Go here: here

If still nothing, your trying to hard. Start over at step 1.

dude... i was TOTALLY serious. jesus.

Having Problems? Heres my Three step solution to anything 2gnt related.
Step 1: Put down everything in your hands.
Step 2: Grab a lucky strike, Smoke it.
Step 3: Walk to the fridge, double fist some keystone ice, sit down in the shade, drink one beer, finish cigarette, drink other beer, roll a joint, smoke it, walk back to your problem, and in about 5 minutes the solution will come to you.
If not. Go here: here

If still nothing, your trying to hard. Start over at step 1.

my god is this ghetto


It will work but the density will be oh lets say not dense. The sound will suck and you will need 1/2 to 3/4 inch thick fiberglass for strength. the woofer will crack anythinf smaller and the foam wont hold up. now if you need 1/2-3/4 fiberglass them why have the foam in there at all? Its a question of density not will it work.

Terry

96 Eagle talon ESI
Star Stage II - Boost/oil/EGT gauges

97 Eclipse
Greddy header/evo exhaust - SFMU/return line - Stage 2 6 puck Sprung hub MIBA clutch - Shortened shifter - Koni Yellows w/eibach prokit - Stillen Fr/Rr swaybars - ceramic intake - DEI Keyless entry alarm - Niche 17" Shoks

Waiting to be installed: Apexi AFC, HKS EVC IV, 450 Turbo injectors, GSX Front brakes (need rotors)

Having Problems? Heres my Three step solution to anything 2gnt related.
Step 1: Put down everything in your hands.
Step 2: Grab a lucky strike, Smoke it.
Step 3: Walk to the fridge, double fist some keystone ice, sit down in the shade, drink one beer, finish cigarette, drink other beer, roll a joint, smoke it, walk back to your problem, and in about 5 minutes the solution will come to you.
If not. Go here: here

If still nothing, your trying to hard. Start over at step 1.

^^^^dude, why are you so angry recently. what you just said didnt make sense, "high density foam" is still FOAM. not everything labled "high density" is riged, which is the main concern here.

with enough structural bracing and a small enclosure, this is a great idea. its been used for ages in making kickpanels and other small 'glass pieces.

:shhh: i do cocaine :/shhh:

ok. ur right. i am a little pissy recently. And i post a lot because all i do at work is sit around. But as far as giving the wrong answers? just show me where i've been giving wrong answers and i will gladly take them back. If i EVER give a opinion on anything important, i always say, "don't quote me" or something like that. BUT. if these guys wanna try something let them. I see you guys getting on other people's cases for dumber stuff than this.

sorry. im just stickin up for this thread.

If im not mistaken, your the one giving wrong advise.

"They don't use the foam to back the fiberglass in racing boats for structure"



"I may be a dumbass sometimes but not all the time."

maybe so. im a dumbass most of the time though.

"EDIT: Might i add, its posts like these that discourages a lot of fabricators for making things for our cars as well. be positive eh?"

Mebbe that wasn't very positive...and i now stand corrected for everything i was wrong about...happy?

Also, "what you just said didnt make sense, "high density foam" is still FOAM."

I have actually no clue what this stuff is he is talking about. but he seems pretty positive he knows what he's talking about. He works with it or something, and if he thinks he knows what he's talking about, i won't question him.

"He's so angry cuz he's constantly posting worthless crap and the wrong answers to everything"

That of all things doesn't make sense man.

Having Problems? Heres my Three step solution to anything 2gnt related.
Step 1: Put down everything in your hands.
Step 2: Grab a lucky strike, Smoke it.
Step 3: Walk to the fridge, double fist some keystone ice, sit down in the shade, drink one beer, finish cigarette, drink other beer, roll a joint, smoke it, walk back to your problem, and in about 5 minutes the solution will come to you.
If not. Go here: here

If still nothing, your trying to hard. Start over at step 1.

Jesus dude, don't bring up the boat thing again.


When they make a fiberglass boat the make a shell in a vacuum mold then they lay the inner and outer shell together. Once they are in place they pour that foam in the shell for boyancy and to make it impossible to sink them. It has NOTHING to do with structure, and the fact that they pour it in after the boat is together, they don't lay the glass on top of foam.

THIS IS WHAT I'M FUCKING TALKING ABOUT.

Originally posted by a_miller_76

Originally posted by extreme97nt You could make a boat out of cement wiht no foam and it would float the foam has nothing to do with it.

Wait now hold on there cowboy You can make a vessel with a diplacement of water greater than that of the sum weight of the vehicle out of ANY material and it will float, but flip it over and you're fucked. Get any of these modern fiberglass bass boats and the hull is 6-12 inches of foam injected into a fiberglass shell. And it's ADVERTISED for floatation so that it's impossible to sink the boat. And it's true. The total weight of the boat is like 1/20th of the amount of water it diplaces and there is no way shape or form that it can take on more water, therefore reducing it's natural mass to displacemt ratio and sinking.Even if you fill the passenger compartment of those boats with water you can't sink them. I may be a dumbass sometimes but not all the time.

Having Problems? Heres my Three step solution to anything 2gnt related.
Step 1: Put down everything in your hands.
Step 2: Grab a lucky strike, Smoke it.
Step 3: Walk to the fridge, double fist some keystone ice, sit down in the shade, drink one beer, finish cigarette, drink other beer, roll a joint, smoke it, walk back to your problem, and in about 5 minutes the solution will come to you.
If not. Go here: here

If still nothing, your trying to hard. Start over at step 1.

please, post some pics for the non beleviers. i was with ya the whole way. hit me up on aim or email me at: imlazy@gmail.com

SWEEET! How much does it weight? and how much power were u puttin to it.

Having Problems? Heres my Three step solution to anything 2gnt related.
Step 1: Put down everything in your hands.
Step 2: Grab a lucky strike, Smoke it.
Step 3: Walk to the fridge, double fist some keystone ice, sit down in the shade, drink one beer, finish cigarette, drink other beer, roll a joint, smoke it, walk back to your problem, and in about 5 minutes the solution will come to you.
If not. Go here: here

If still nothing, your trying to hard. Start over at step 1.

i would reply with the reason it will not work as well as MDF but after your ingnorant reply 420aye i wont bother...what the hell do know i hit 135 DB with 2 10's and 300w 10years ago when i ran competition. Do what you want and give it a try.....while your at it try using a fuggin bucket and some liquid nails i bet that is one hell of an idea too.

God your a a$$ lately, get a hooker and get a piece already.

Terry
96 Eagle talon ESI
Star Stage II - Boost/oil/EGT gauges

97 Eclipse
Greddy header/evo exhaust - SFMU/return line - Stage 2 6 puck Sprung hub MIBA clutch - Shortened shifter - Koni Yellows w/eibach prokit - Stillen Fr/Rr swaybars - ceramic intake - DEI Keyless entry alarm - Niche 17" Shoks

Waiting to be installed: Apexi AFC, HKS EVC IV, 450 Turbo injectors, GSX Front brakes (need rotors)

Wanna save weight? Don't put ghey shit in your car.

____________________________________________________
four nails four corners four riders and four horses

Originally posted by etx
Wanna save weight? Don't put ghey shit in your car.

Having Problems? Heres my Three step solution to anything 2gnt related.
Step 1: Put down everything in your hands.
Step 2: Grab a lucky strike, Smoke it.
Step 3: Walk to the fridge, double fist some keystone ice, sit down in the shade, drink one beer, finish cigarette, drink other beer, roll a joint, smoke it, walk back to your problem, and in about 5 minutes the solution will come to you.
If not. Go here: here

If still nothing, your trying to hard. Start over at step 1.