Subject	Zarcasm is insistent that secondary characteristics matter
Posted by	BobbyT on September 17, 2009 at 5:18 AM
	This message has been viewed 123 times.
In Reply To	an engine is not a closed volume posted by aliaZ on September 16, 2009 at 05:31 PM
Message	My point is that they only go into determining how much "stuff" you have to combust. While we talk about an engine's "flow", it's not a jet. You're still moving discreet units through, a cylinder-full at the time. So at any given moment your turbos are blowing into a closed space, which is why you build boost (positive pressure, vs an NA, which only faces resistance to flow). The whole point of this discussion is that amount of positive pressure doesn't tell you how much air you're actually getting in there, so with different turbos or different condition turbos the same psi means nada.
Follow Ups	How do turbos degrade and fail? - Zarcasm(Hfd, CT) 22:09:45 09/13/09 read inside - jdubs 22:25:50 09/13/09 Helpful but everything here assumes like-new performance - Zarcasm(Hfd, CT) 09:05:36 09/14/09 Re - pacmanpth 22:48:20 09/13/09 Don't the intercoolers relieve the temperature concerns? - Zarcasm(Hfd, CT) 08:56:15 09/14/09 No, intercoolers have nothing to do with going beyond - boost420 11:50:23 09/14/09 Re - pacmanpth 11:57:18 09/14/09 So installing a BIGGER intercooler will alleviate intake tmp - Zarcasm(Hfd, CT) 14:55:44 09/14/09 how do you sound so intelligent yet know how 2 destroy cars? (n/m) - SuparexTT 15:55:13 09/14/09 Boost = pressure - BobbyT 03:48:45 09/14/09 Engine benefits from both airflow AND pressure. - Zarcasm(Hfd, CT) 08:49:37 09/14/09 "Airflow" implies the rate of mass flow - pacmanpth 11:59:40 09/14/09 If my math is correct... - Adam (NoVA) 13:08:16 09/14/09 You are referring to compression ratio, not compression. - zellamay 13:41:49 09/14/09 Correction: "It's just NOT as simple ... (n/m) - zellamay 14:09:34 09/14/09 yes, i was attempting to illustrate that its more - Adam (NoVA) 14:48:47 09/14/09 Thanks for the reference - makes good sense. (n/m) - Zarcasm(Hfd, CT) 15:08:21 09/14/09 The engine will not "benefit from the increased pressure" - zellamay 13:21:13 09/14/09 Read ^ this post ^ Zarcasm - BobbyT 13:58:19 09/14/09 It's NOT just about the number of molecules! - Zarcasm(Hfd, CT) 15:24:54 09/14/09 I was under the impression that the fact that the molecules - Z_Cherub 15:51:31 09/14/09 You are exactly right. At the same (boost) pressure, - zellamay 16:35:46 09/14/09 Molecules probably have the advantage, BUT... - Zarcasm(Hfd, CT) 22:02:51 09/14/09 There are a couple of issues here. I don't understand your - zellamay 23:17:00 09/14/09 Molecules probably win / MechE = Mechanical Engineer - Zarcasm(Hfd, CT) 08:16:54 09/15/09 Molecule # doesn't "win"; it's THE limiting factor - BobbyT 05:05:42 09/16/09 Well said. - Z_Cherub 15:20:30 09/17/09 boost is actually a measure of restriction. (n/m) - Antonio(AZ->NYC) 09:38:31 09/14/09 What do you mean? - Zarcasm(Hfd, CT) 21:34:42 09/14/09 restriction imposed by the engine itself - aliaZ 06:13:21 09/15/09 In other words, your turbo smacks a bunch of air molecules - BobbyT 05:11:02 09/16/09 not really - aliaZ 09:04:57 09/16/09 The point was that you're putting things in a close volume - BobbyT 17:18:00 09/16/09 an engine is not a closed volume - aliaZ 17:31:53 09/16/09 Zarcasm is insistent that secondary characteristics matter - BobbyT 05:18:08 09/17/09 Can a used turbo be refurbished to close to new performance? - Zarcasm(Hfd, CT) 08:48:07 09/14/09 A used one can even be improved (SP500 etc), depends on - Bernie (NoVA) 11:10:32 09/14/09 Well depends on what? What typically gets damaged? - Zarcasm(Hfd, CT) 15:32:50 09/14/09 Depends on what is damaged, if the housing is cracked or - Bernie (NoVA) 16:07:01 09/14/09 yes, but why? Newer technologies (better/stronger spool) - boost420 13:20:22 09/14/09 Can you give me some new vs refurb turbo comparisons? - Zarcasm(Hfd, CT) 15:35:56 09/14/09 Are you asking for compressor maps or just - boost420 15:43:37 09/14/09 If you're mechanically inclined, using "off the shelf" - boost420 17:02:48 09/14/09 Off the top of my head: you can do a cheap rebuild of - zellamay 16:44:32 09/14/09
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