Douse Posted October 2, 2007 Share Posted October 2, 2007 Hey all, I am curious of peoples opinions relating to the plastic on the underside of the engine. I had to take it off to do some work and I am unsure about whether to put it back on. There are pros on cons both ways. If i leave it on it: a) Protects against grime build up b) Can reduce air flow around the angine c) Is a pain in the ass everytime i need to do some work under my car Is there that much to gain by putting it back on? It should keep the engine cooler although I dont like the idea of crap building up on the bottom of my engine, especially near all the belts. So what do you think? Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/ Share on other sites More sharing options...
Habler Posted October 2, 2007 Share Posted October 2, 2007 I have a metal one under mine.... But thats to protect the sump from the evil ripple strips Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/#findComment-3385257 Share on other sites More sharing options...
Yawn Posted October 2, 2007 Share Posted October 2, 2007 I say keep it on. But if you have a 32gtr then take it off and sell it to me The evil ripple strips ripped mine off Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/#findComment-3385300 Share on other sites More sharing options...
siksII Posted October 2, 2007 Share Posted October 2, 2007 Put it on, if you dont have the engine bay will get dirty very quickly, and you will get water on the belts. Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/#findComment-3385304 Share on other sites More sharing options...
Douse Posted October 2, 2007 Author Share Posted October 2, 2007 Hahaha nah sorry man just a GTS-T I say keep it on. But if you have a 32gtr then take it off and sell it to me The evil ripple strips ripped mine off Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/#findComment-3385307 Share on other sites More sharing options...
dmr Posted October 2, 2007 Share Posted October 2, 2007 i don't beleive it will keep the engine cooler. maybe just the sump. i had mine off while doing some work underneath the car for about a week or so, and it got filthy under there. keep it on imo, it's there for a reason. Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/#findComment-3385315 Share on other sites More sharing options...
Liz Posted October 2, 2007 Share Posted October 2, 2007 keep it it will actually increase air FLOW rather than reduce it. It'll stop air from coming up underneath the car which would inhibit the flow of air coming through the car! you've gotta give the air that you catch with your intercooler and radiator somewhere to go or it won't flow freely! Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/#findComment-3385330 Share on other sites More sharing options...
QWK32 Posted October 2, 2007 Share Posted October 2, 2007 the thing is a pain in the ass when you drop tools or bolts/nuts when your working on your car. Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/#findComment-3385361 Share on other sites More sharing options...
Fujiwara Posted October 2, 2007 Share Posted October 2, 2007 anyone know where you can get replacements? Or metal ones for that matter? The one on my GTT has a slash on it Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/#findComment-3385426 Share on other sites More sharing options...
bryyy Posted October 2, 2007 Share Posted October 2, 2007 GKTECH sell metal ones, not sure if he does them for r34 though, im sure he could make something up. leave it on though, it definitely increases air flow, and in some cars without it they can overheat (my old FC for instance.) Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/#findComment-3385453 Share on other sites More sharing options...
adam-__- Posted October 3, 2007 Share Posted October 3, 2007 I don't think taking them off will cool the engine in anyway. Heat rises and the cover is at the bottom. Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/#findComment-3387096 Share on other sites More sharing options...
Thunderbolt Posted October 3, 2007 Share Posted October 3, 2007 There was a decent article on Autospeed regarding undertrays on cars. See here: http://autospeed.com/A_2160/cms/article.html If you can't be bothered reading, then it basically says that having no undertray is detrimental to radiator and intercooler performance (on the test car anyhow). However a nice custom undertray that has been tested, can make and even better outcome than the factory one. Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/#findComment-3387469 Share on other sites More sharing options...
TTT Posted October 3, 2007 Share Posted October 3, 2007 keep itit will actually increase air FLOW rather than reduce it. It'll stop air from coming up underneath the car which would inhibit the flow of air coming through the car! you've gotta give the air that you catch with your intercooler and radiator somewhere to go or it won't flow freely! this is true. same reason people get radiator deflectors/air guides, intercooler air dam guides etc. it forces the air to go through where it should rather than the path of least resistance. Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/#findComment-3389201 Share on other sites More sharing options...
Douse Posted October 3, 2007 Author Share Posted October 3, 2007 Cheers guys, I think I will put it back on Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/#findComment-3389303 Share on other sites More sharing options...
Habler Posted October 4, 2007 Share Posted October 4, 2007 A mate of mine got an aftermarket metal one. It was costly for what it is (a metal sheet with one bend and some bolt holes) Easy solution was to get a metal fabricator to copy the design and make one up for us. This ended up costing $20 per piece with no bolt holes. You then put bearing blue on on the bolts while they are in the holes and push your metal sheet up on to it and WELLAH! Drill out the spots where the bearing blue has touched. Our metal sheets ended up fitting both skylines and s13's with the bolt holes just being in different places. I have seen places charging $150 for these, well worth just working one out yourself maybe using your plastic one as an indicator. But got to agree with bolts and tools falling on it = ANNOYING Link to comment https://www.sau.com.au/forums/topic/187590-the-plastic-on-the-underside-of-your-engine/#findComment-3390418 Share on other sites More sharing options...
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