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Location:
Adelaide
Registered:
May 2003
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Polyurethane Injection
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Fri, 09 April 2004 01:56
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Has anyone done this. The increase in structural rigidity woudl be quite handy for the track.
It would be done on my sprinter if im to do it, but im not sure on the compounds to use etc etc.
ANyone?
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Location:
Melbourne
Registered:
March 2003
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Re: Polyurethane Injection
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Fri, 09 April 2004 07:22
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I gather you mean injection of polyurethane FOAM. Yes it does increase structural strength of chassis rails and other cavities within the body, cross members sills etc. I have done it to a couple of cars. It's a messy process and the car needs to be stripped down to essentials to do it. It requires high pressure equipment, and all holes in the areas to be filled need to be blocked off.
Once completed, any welding etc. to the areas filled will cause possible fire problems. Subsequent panel damage to sills and body panels will require clearing out foam before repairs.
A well built and installed roll cage will have a far better net result, though injection of foam to front rails forward of the firewall is not a bad addition to a cage.
Laurie D
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Location:
Adelaide
Registered:
May 2003
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Re: Polyurethane Injection
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Fri, 09 April 2004 07:41
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Hmm, so not as simple as i thought.
My sprinter is getting stripped down anyway, and will have a 6point dual xbraced cage anyway, so i may not end up doing it. But its interesting all the same.
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Polyurethane Injection
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Fri, 09 April 2004 07:41
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Also after a few months and a bit of moisture, rust will start forming between the foam and the metal.
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Location:
Adelaide
Registered:
May 2003
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Re: Polyurethane Injection
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Fri, 09 April 2004 07:42
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Ok thats NOT good.
What about the space invader type stuff.
Budget i know, but would it make any difference?
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Polyurethane Injection
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Fri, 09 April 2004 07:44
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Will still cause rust.
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Location:
Adelaide
Registered:
June 2003
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Re: Polyurethane Injection
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Fri, 09 April 2004 07:44
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i might be good for sound deadening purposes, but its a cunt to get off if you ever wanted to and i reckon it would do stuff all structuraly
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Location:
Adelaide
Registered:
May 2003
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Re: Polyurethane Injection
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Fri, 09 April 2004 07:46
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Ok, ill skip out on that one.
I had read about some guy in the US doing it to his tubular framed sprint car for extra rigidity.
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Polyurethane Injection
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Fri, 09 April 2004 07:46
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Oh it does help alot with the structure of the car. Works great actually, but it doesnt go down to well if you want the car to stay looking good 
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I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
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Re: Polyurethane Injection
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Fri, 09 April 2004 09:02
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FWIW VT Commodores have "space invader" in the body to help with sound deadening...prolly wouldn't do much for rigidity...
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I supported Toymods
Location:
Perth WA
Registered:
May 2002
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Re: Polyurethane Injection
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Fri, 09 April 2004 13:41
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Just for a laugh - I did an experiment to see what the space invader stuff would do to rigidity.
I put some into an empty 2 litre drink bottle and put the lid on.
It does increase rigidity, and makes the bottle more "solid", but I don't think it would replace adequate metal bracing.
Also the stuff expands A LOT and is very messy. I didn't put it in the car in the end, because I didn't want big blobs of foam invading my interior. I also did'nt want it to have a sponge effect if water got into it.
Also the stuff hardens with water/vapour, so it may take a while to solidify if you are filling large volumes.
My advice if you are considering it, is it's cheap to try it outside your car.
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Location:
Melbourne
Registered:
March 2003
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Re: Polyurethane Injection
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Sat, 10 April 2004 01:07
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Advice:
Do NOT use single pack moisture cure foams (Space Invader etc,) for this application.
Laurie D
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Location:
Adelaide
Registered:
May 2003
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Re: Polyurethane Injection
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Sat, 10 April 2004 01:58
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Yeah, ill just invest in a good cage and strutbrace. As well as maybe a steel tube welded across the front under the radiator support. Ill have to check if that compromises a crumple zone though.
Or maybe lengthways along the supports.
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