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Old 12-07-2006, 09:54 PM   #21
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whats an intercooler do?
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Old 12-07-2006, 09:58 PM   #22
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Quote:
Originally posted by PuppiesBalls
whats an intercooler do?
cools the intake air
as once the air has pasted through a gert hot turbo which is driven by exhaust gases it needs to be cooled back down to produce more power as colder air is more dence.most turboed cars have intercoolers
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Old 12-07-2006, 10:02 PM   #23
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All of the 1500cc supercharged ski's are intercooled.
I found a vid of one from the states on the GPS at 83mph..
http://purelinux.org/seadoo/Franks83mph.wmv
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Old 12-07-2006, 10:22 PM   #24
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Quote:
Originally posted by Burty
cools the intake air
as once the air has pasted through a gert hot turbo which is driven by exhaust gases it needs to be cooled back down to produce more power as colder air is more dence.most turboed cars have intercoolers
cheers Rob
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Old 12-07-2006, 10:27 PM   #25
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Quote:
Originally posted by Grant
All of the 1500cc supercharged ski's are intercooled.
Is that water/air or air/air as the baily intercooler mentioned in that ad would be air/air and so quite big. Water/air charge coolers are generally alot smaller.
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Old 12-07-2006, 10:29 PM   #26
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Quote:
Originally posted by Burty
once the air has pasted through a gert hot turbo which is driven by exhaust gases it needs to be cooled back down
Actually, the main reason it's gets hot, is the act of compressing it.

bit like the way a bicycle pump gets hot when you pump hard n fast.
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Old 12-07-2006, 10:37 PM   #27
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Quote:
Originally posted by Jon Fuller
gets hot when you pump hard n fast.
put some KY in the fridge
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Old 12-07-2006, 10:43 PM   #28
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Quote:
Originally posted by Jon Fuller
Actually, the main reason it's gets hot, is the act of compressing it.

bit like the way a bicycle pump gets hot when you pump hard n fast.
I think its a combination of the compression of the inlet charge and the heat transfer from the hot exhaust gasses. The exhaust housing of the turbo is allways the first to start glowing red hot and it will transfer alot of its heat into the compressor housing.
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Old 12-07-2006, 11:03 PM   #29
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I don't really agree, but can't be too bothered either.

The portion of turbo that the heat would be transfering through, ie, the centre bearing casting, only really gets as hot as the oil running through the bearing, and in a lot of cases, that centre bearing is water cooled, so probably sub 100c.

Exhaust housings are often lagged too. my boat ones are jacketed, so run at around 85c.

The air is in, and out pretty quick, and I can't see it picking up that much heat on it's way through. the majority of the generated heat is from the compression. supercharged motors still need just as much intercooling, and there's no heat transfer there.
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Old 12-07-2006, 11:14 PM   #30
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Jon is right - read "Maximum Boost" by Corky Bell for the theory.
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Old 12-07-2006, 11:15 PM   #31
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The Two halves are bolted together and so I would have thought one half would transfer its heat to the other half fairly effectively. I've seen many turbo's in cars (on rolling roads) glowing red hot and its allways the exhaust housing that starts glowing first followed by the compressor housing. The hot exhaust gasses pass through the turbo pretty quick but alot of their heat is transferred. Air passing through a hair dryer passes by the heating elements pretty quickly but picks up alot of heat as it does, no compression involved there. As I said before I reckon its a combination of the two.
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Old 12-07-2006, 11:16 PM   #32
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excuse my ignorance, but I also thought intercoolers where used due to gases wanting to expand when heated? the cooling thus allowing a greater density of air into the motor?
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Old 12-07-2006, 11:23 PM   #33
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There's no dispute as the what the intercooler does its why the exhaust gasses are so hot in the first place.

I don't dispute the fact that alot of the heat comes from the compression of the inlet charge but in my opinion the heat transfer from the exhaust housing into the compressor housing will also heat the gasses passing through said compressor housing. I've seen it with my own two eyes.
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Old 12-07-2006, 11:36 PM   #34
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Quote:
Originally posted by Johnny Boat Dude
I've seen it with my own two eyes.
AAaah, there's the problem! measuring with the wrong tools, you need a thermometer!

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Old 12-07-2006, 11:38 PM   #35
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and not one or Burtys rectal ones!
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Old 12-07-2006, 11:38 PM   #36
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Quote:
Originally posted by Captain Chaos
excuse my ignorance, but I also thought intercoolers where used due to gases wanting to expand when heated? the cooling thus allowing a greater density of air into the motor?
Go back to bed!
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Old 12-07-2006, 11:40 PM   #37
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Quote:
Originally posted by Johnny Boat Dude
I've seen many turbo's in cars (on rolling roads) glowing red hot and its allways the exhaust housing that starts glowing first followed by the compressor housing.
Are you saying that you've seen a compressor housing glow red?

if that much heat were transmitted into the centre bearing assy, it would fkk the oil instantly, ie, enough red heat to conduct into the compressor body, and turn that red too! ...yooo feckin sure?
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Old 12-07-2006, 11:41 PM   #38
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back to Uni more like, what a waste of 4 years that was!
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Old 12-07-2006, 11:44 PM   #39
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Go back to bed!
and dont be so unkind ****face........... I was only trying to chat with the bigger boys. Not my fault i'm stoopid.
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Old 12-07-2006, 11:45 PM   #40
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Quote:
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and dont be so unkind ****face...........
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