Subject	Molecules probably have the advantage, BUT...
Posted by	Zarcasm(Hfd, CT) on September 14, 2009 at 10:02 PM
	This message has been viewed 99 times.
In Reply To	You are exactly right. At the same (boost) pressure, posted by zellamay on September 14, 2009 at 04:35 PM
Message	I was hoping some smart MechE would speak up and set the story straight. If a TT and NA motor would be run at the same resultant compression (absolute pressure) the TT would have a lot more power due to the increased air molecules. But the TT and NA are designed with noticeably different cylinder compression ratios, so where does the resultant compression fall out? I don't know. One thing's for sure: it's possible the design a NA engine with the same power as our beloved TT but it would likely be an 8-cylinder or a diesel. The diesel does it by running at even higher compression ratios --not so much the molecules.
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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