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Silver_r33 Occasional Poster Location: Canberra Registered: November 2004	Re: intercooler sizes? Thu, 03 February 2005 06:53 Norbie wrote on Thu, 03 February 2005 14:12 Silver_r33 wrote on Thu, 03 February 2005 10:14 Ahhh, its not just the volume, but the static pressure drop that will cause issues. A larger intercooler (assuming the core is the same as a smaller version) will by definition have a larger internal surface area. Now if you're not actually using this larger surface area to lower the temperature of the charge air significantly, all you are achieving is reduced air velocity, meaning a high static pressure drop across the cooler. So you're telling me the larger the intercooler, the greater the pressure drop? Of course there will be a pressure drop, cooler air = more dense = lower pressure. This is what the intercooler is supposed to do, it's a GOOD thing. I think you're misunderstanding what i am saying. Let me give an example: You're running a fairly small turbo, say a HKS2510 on a 2L engine, at about 18 psi *before* the intercooler, and the charge air temp is about 80 degrees. The intercooler used is a small size, say 300x200x75 item, and cools the charge air to 30 degrees on a 27 degree day. Due to the intercooler not being a frictionless part of the inlet tract, you lose a couple of psi of boost at the actual inlet manifold. Say you actually 'see' 16psi at the throttle body. Now take the over-sized intercooler with the same charge air temp out of the turbo/supercharger (80 degs), same ambient temp (27 degs) and same boost. You'll see a *lower* boost pressure (say 14psi) at the throttle body due to increased surface arear and therefore friction with the charge air, with only a slightly reduced charge air temp drop(say 28.5 degrees). Do you think that the small reduction in charge air temperature makes up for the lesser amount of air? Without goining into PV=nRT equations, i'm pretty sure you'll agree that you get to a point where the bigger intercooler will cause a greater static pressure drop which no longer offsets the power produced by cooler air charge. Does that make semse? [Report message to a moderator]

	Subject	Poster	Date
	intercooler sizes?	OnAHigh	Wed, 02 February 2005 03:55
	Re: intercooler sizes?	stradlater	Wed, 02 February 2005 03:58
	Re: intercooler sizes?	OnAHigh	Wed, 02 February 2005 04:06
	Re: intercooler sizes?	Silver_r33	Wed, 02 February 2005 04:29
	Re: intercooler sizes?	Norbie	Wed, 02 February 2005 09:19
	Re: intercooler sizes?	Silver_r33	Thu, 03 February 2005 00:14
	Re: intercooler sizes?	Norbie	Thu, 03 February 2005 03:12
	Re: intercooler sizes?	Silver_r33	Thu, 03 February 2005 06:53
	Re: intercooler sizes?	OnAHigh	Wed, 02 February 2005 04:34
	Re: intercooler sizes?	stradlater	Wed, 02 February 2005 04:36
	Re: intercooler sizes?	HyDrA	Wed, 02 February 2005 04:36
	Re: intercooler sizes?	Silver_r33	Wed, 02 February 2005 04:49
	Re: intercooler sizes?	OnAHigh	Wed, 02 February 2005 05:11
	Re: intercooler sizes?	stradlater	Wed, 02 February 2005 05:12
	Re: intercooler sizes?	HyDrA	Wed, 02 February 2005 23:59
	Re: intercooler sizes?	Norbie	Thu, 03 February 2005 03:10
	Re: intercooler sizes?	HyDrA	Thu, 03 February 2005 03:52
	Re: intercooler sizes?	stradlater	Thu, 03 February 2005 03:05
	Re: intercooler sizes?	stradlater	Thu, 03 February 2005 03:17
	Re: intercooler sizes?	3sfe	Thu, 03 February 2005 05:57
	Re: intercooler sizes?	Norbie	Thu, 03 February 2005 07:02

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