BenB
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| posted on 3/8/08 at 11:33 AM |
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Plastic plenum chambers
Is there any reason why people often make aftermarket plenums out of aliminium?? I would have though a plastic plenum could be made and (not having
access to TIG) epoxied up much easier than an ali one. And (bearing in mind I know jack sh!t about most things technical) I would have thought plastic
would insulate the intake charge better than aliminium from under bonnet temperatures....
Obviously the bit which attaches onto the engine would have to be made from something heat proof due to heat soak.....
Just wondering....
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scootz
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| posted on 3/8/08 at 05:15 PM |
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I was wondering about this too Ben... obviously, with an RS4 engine running Busa throttle bodies, I'm not going to find something 'of the
shelf'!
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BenB
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| posted on 3/8/08 at 05:24 PM |
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Well I'm going to make a log style plenum chamber out of 4" soil + waste uPVC pipe (well it is a log  ) with solvent end caps etc etc.
If it weighs half a tonne (or melts) I'll make it out of ali MIG tack weld it and take it to my brother to TIG up properly...
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mark chandler
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| posted on 3/8/08 at 05:41 PM |
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Jauguar won awards when the new v8 engine came out in 1996 for the use of plastic's.
Inlet, plenum, rocker covers, timing covers plug covers, a whole host of bits and bobs out of plastic.
Lots of production cars use plastic inlets etc so why not.
The hard bit is screwing it all together.
regards Mark
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BenB
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| posted on 3/8/08 at 05:45 PM |
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Solvent glue for uPVC and epoxy is my plan
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RK
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| posted on 3/8/08 at 05:49 PM |
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Heat? CF won't be as affected that's why I thought that was used a lot.
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mr henderson
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| posted on 3/8/08 at 05:58 PM |
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Epoxy pre-preg might be the stuff to use for this application, no heat worries and no adhesion worries
John
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martyn_16v
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| posted on 3/8/08 at 07:26 PM |
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I'd hazard a guess that it's all about the bling. Much easier to sell shiny metal things for extortionate prices to chavs
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BenB
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| posted on 3/8/08 at 09:14 PM |
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quote:
Originally posted by mr henderson
Epoxy pre-preg might be the stuff to use for this application, no heat worries and no adhesion worries
John
Yup. But for the hassle and cost you may as well TIG it up with ali!!!!
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nz_climber
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| posted on 4/8/08 at 04:28 AM |
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My toyota beams 3sge has a alloy plenum, but also has plastic insulators between it and the block, to help prevent heat soak from the block. So there
is plastic that handles the heat just fine.
http://aarons7.wordpress.com
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saigonij
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| posted on 4/8/08 at 07:18 AM |
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my zetec uses a plastic inlet manifold.
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BenB
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| posted on 4/8/08 at 09:18 AM |
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Good! I'm going to make it out of plastic and spray it bling chrome to try and prevent heat getting into it....
Good point re plastic insulators- the ST has got them at the moment Not sure they'll cope with boost though so think they're going into
the bin probably to be replaced with some silicon tube as a connector between the engine and the airbox...
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Syd Bridge
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| posted on 4/8/08 at 09:49 AM |
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I've been making cfrp intakes for yank v8's since 1989, when everyone said they wouldn't work!
Currently about to do a manifold to adapt bike tb's to a Suzuki car engine.
Not too difficult to make yourself if you can work with epoxy. You don't have to use carbon, glass will do, even csm.
Just make sure you get the right resin! They actually DO get warm enough to change shape!
Cheers,
Syd.
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MikeRJ
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| posted on 4/8/08 at 12:16 PM |
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PVC used for drain pipes etc. gets soft at very low temperatures, even boiling water is enough to make them distort.
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whitestu
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| posted on 5/8/08 at 08:29 PM |
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quote:
PVC used for drain pipes etc. gets soft at very low temperatures, even boiling water is enough to make them distort.
I'm surprised at the - had a go at making an airbox out of black poly downpipe and struggled to get it to change shape using a heat gun.
Stu
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mr henderson
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| posted on 5/8/08 at 08:37 PM |
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quote:
Originally posted by whitestu
quote:
PVC used for drain pipes etc. gets soft at very low temperatures, even boiling water is enough to make them distort.
I'm surprised at the - had a go at making an airbox out of black poly downpipe and struggled to get it to change shape using a heat gun.
Stu
The black stuff is probably ABS
John
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