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wannabe drifter
P Plater
33 Posts
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 Posted - 02 Dec 2006 : 4:12:15 PM
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hey guys, i been reading this site 4 a while and its been pretty damn helpful.
i just want to know if you guys have ever seen or made a heat shield 4 the left hand side exhaust so that to try and stop heat coming up on to the air intake piping.
I have a 1989 series 1 all stock.
i seen on on www.v6supercharged.com.au for a series 2 and they want $98 for it!
any help would be appreciated. thanks
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mouce
National Driver
1525 Posts
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Posted - 02 Dec 2006 : 5:42:29 PM
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To be honest, I can't see it making a huge difference to the air intake temps, given how fast the air moves through there. To be honest you'd probably be better off getting a CAI, that's make more of a difference.
Put $60-$70 into that and I think you'd find it money better spent. |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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wannabe drifter
P Plater
33 Posts
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Posted - 02 Dec 2006 : 11:08:49 PM
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yeah. i was gunna get a CAI anyway.
its just that when i pop the bonnet and feel the pipe after a drive it feels pretty warm, almost hot.
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mouce
National Driver
1525 Posts
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Posted - 03 Dec 2006 : 10:01:12 AM
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| Hey, you're not wrong, the pipe gets damn hot. But one of the joys of having such a large engine thumping away under the bonnet is that it needs a lot of air. Because of that the air flowing through the pipe is moving so fast that it doesn't really get a chance to heat up too much. If you were worried about it, it would probably be cheaper and easier to wrap the intake pipe with insulating foam than it would be to build an 'effective' heat shield. |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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wannabe drifter
P Plater
33 Posts
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Posted - 04 Dec 2006 : 10:42:22 PM
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ok, I'll try that. sounds easier and less expensive.
thanks 4 the help. |
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sneezy19752
Learner
9 Posts
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Posted - 06 Dec 2006 : 12:09:50 AM
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I guess while the car is idling, and the air is only being sucked through the Idle Air Control Vavle (IACV) (about 10mm at it's narrowest point) then the velocity in the air intake would be far slower and so may effect the Manifold Air Temperature (MAT) reading when you say dump the throttle off the line... So at prolonged idle the intake air temp may increase a tad. Off course once you dump it (assuming you do) the velocity will increase and you will get nice cold air (from the CAI you installed).
I installed a CAI (cost about $90 all up from Holden's (buy it off ebay, it's cheaper)) and I definately noticed a difference. Also a K&N Panel Filter made a nice difference. Looking for extractors and 2.5" zorst this weekend.
Also, since the Air intake pipe is plastic, it won't conduct heat anywhere near as quickly as say a steel pipe would. I've seen some chrome air intake pipes on ebay and wonder why...
Mouce's idea of wrapping the pipe in insultaing foam sounds like a smart way to go. Especially if it is like the stuff they sell at a particular "Rubber" store, that has shiny aluminium on one side. If you really wanted to check, you could get a thermocouple and measure air inlet temp (before the air filter) and air inlet temp (at the throttle body (MAT sensor)) before and after the insulating, to see if it's made any appreciable difference (Yes I've thought this through but have been too lazy to do it yet). My guess is that it will make most difference at idle, and MAY give you a bit more punch off the line at Wide Open Throttle (WOT) as the MAT sensor will take a few fractions of a second to register the cooler air going through the Throttle Body and hence allow more ignition advance.
The other situation it may help is at prolonged cruise with a tail wind, but that's just getting silly... too much beer. |
Cheers,
Sneezy |
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wannabe drifter
P Plater
33 Posts
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Posted - 06 Dec 2006 : 6:39:49 PM
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i think you guys are right. cause when i think about it now. A heat shield only stops heat from the exhaust but insulating the pipe will stop heat from everywhere off the engine. I was only worried about it affecting idle and take offs really.
how much would this insulation cost me. I'm guessing you have to buy it by the meter. |
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