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JustenGT4
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Canberra
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June 2003

Re: 8psi extra, 10rwkw extra?	Tue, 19 July 2005 05:27

No no a leak down will tell you nothing about valve spring rate. If your valves are not seating then a leak down will show that but that's not the prob i'm referring to. What happens when valve springs go soft is that the boosted intake charge can actually hold the valve open...the extra 20psi you are applying to the valve on top of all the other forces going on are enough that the rate can't counter it and the valve stays open and doesn't seal the combustion chamber. The fix is new or stiffer valve springs. A mate with a 4AGTE suffered this exact prob recently. Big boost over 5K and the valves wouldn't seal. Less boost and/or less revs and no probs. The fix was new valve springs...his were just a bit tired. You need to check the valve spring rate ie measure how much force it takes to compres them a certain amount and compare to the factory specs. i suspect this won't be easy with the valves in place but there may be a gauge to do this? [Report message to a moderator]

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Read Message 8psi extra, 10rwkw extra? Chris Davey Fri, 15 July 2005 23:33
Re: 8psi extra, 10rwkw extra? Rallystanza Fri, 15 July 2005 23:44
Re: 8psi extra, 10rwkw extra? Chris Davey Sat, 16 July 2005 00:04
Re: 8psi extra, 10rwkw extra? bored Sat, 16 July 2005 00:50
Read Message Re: 8psi extra, 10rwkw extra? Chris Davey Sat, 16 July 2005 02:37
Re: 8psi extra, 10rwkw extra? VeeP Sat, 16 July 2005 00:56
Re: 8psi extra, 10rwkw extra? Chris Davey Sat, 16 July 2005 02:42
Re: 8psi extra, 10rwkw extra? Special Ed Sat, 16 July 2005 01:14
Read Message Re: 8psi extra, 10rwkw extra? Chris Davey Sat, 16 July 2005 02:43
Re: 8psi extra, 10rwkw extra? Special Ed Sat, 16 July 2005 01:17
Re: 8psi extra, 10rwkw extra? Soarer Tue, 19 July 2005 07:57
Re: 8psi extra, 10rwkw extra? Mr DOHC Tue, 19 July 2005 10:48
Read Message Re: 8psi extra, 10rwkw extra? 82MKII Tue, 19 July 2005 11:05
Re: 8psi extra, 10rwkw extra? Mr DOHC Tue, 19 July 2005 11:33
Re: 8psi extra, 10rwkw extra? Chris Davey Sat, 16 July 2005 03:25
Re: 8psi extra, 10rwkw extra? Allan Sat, 16 July 2005 04:21
Re: 8psi extra, 10rwkw extra? Chris Davey Sat, 16 July 2005 04:25
Read Message Re: 8psi extra, 10rwkw extra? Allan Sat, 16 July 2005 04:44
Re: 8psi extra, 10rwkw extra? Chris Davey Sat, 16 July 2005 05:33
Re: 8psi extra, 10rwkw extra? Allan Sat, 16 July 2005 05:47
Re: 8psi extra, 10rwkw extra? KOFFEE-BLACK Sat, 16 July 2005 05:56
Read Message Re: 8psi extra, 10rwkw extra? mc68 Sat, 16 July 2005 16:04
Re: 8psi extra, 10rwkw extra? Chris Davey Sat, 16 July 2005 06:27
Re: 8psi extra, 10rwkw extra? Allan Sat, 16 July 2005 06:37
Re: 8psi extra, 10rwkw extra? Chris Davey Sat, 16 July 2005 08:31
Re: 8psi extra, 10rwkw extra? Chris Davey Sat, 16 July 2005 08:36
Read Message Re: 8psi extra, 10rwkw extra? thechuckster Sat, 16 July 2005 08:49
Re: 8psi extra, 10rwkw extra? Chris Davey Sat, 16 July 2005 09:11
Re: 8psi extra, 10rwkw extra? Chris Davey Sat, 16 July 2005 09:17
Re: 8psi extra, 10rwkw extra? oldcorollas Sat, 16 July 2005 11:07
Read Message Re: 8psi extra, 10rwkw extra? Chris Davey Sun, 17 July 2005 02:37
Re: 8psi extra, 10rwkw extra? Allan Sun, 17 July 2005 03:28
Re: 8psi extra, 10rwkw extra? improvedae86 Sat, 16 July 2005 11:15
Re: 8psi extra, 10rwkw extra? Chris Davey Sat, 16 July 2005 15:08
Read Message Re: 8psi extra, 10rwkw extra? Chris Davey Sun, 17 July 2005 02:40
Re: 8psi extra, 10rwkw extra? Chris Davey Sun, 17 July 2005 09:19
Re: 8psi extra, 10rwkw extra? oldcorollas Sun, 17 July 2005 13:49
Re: 8psi extra, 10rwkw extra? Chris Davey Sun, 17 July 2005 21:19
Read Message Re: 8psi extra, 10rwkw extra? Mr DOHC Mon, 18 July 2005 09:54
Re: 8psi extra, 10rwkw extra? 1JZ.747 Tue, 19 July 2005 01:30
Re: 8psi extra, 10rwkw extra? oldcorollas Tue, 19 July 2005 02:36
Re: 8psi extra, 10rwkw extra? Kyosho Sun, 17 July 2005 06:26
Re: 8psi extra, 10rwkw extra? E30-323ti Sun, 17 July 2005 07:32
Read Message Re: 8psi extra, 10rwkw extra? Chris Davey Mon, 18 July 2005 22:35
Re: 8psi extra, 10rwkw extra? Chris Davey Tue, 19 July 2005 03:00
Re: 8psi extra, 10rwkw extra? JustenGT4 Tue, 19 July 2005 03:40
Re: 8psi extra, 10rwkw extra? Chris Davey Tue, 19 July 2005 04:07
Read Message Re: 8psi extra, 10rwkw extra? JustenGT4 Tue, 19 July 2005 04:50
Re: 8psi extra, 10rwkw extra? Allan Tue, 19 July 2005 04:15
Re: 8psi extra, 10rwkw extra? Chris Davey Tue, 19 July 2005 04:19
Re: 8psi extra, 10rwkw extra? Allan Tue, 19 July 2005 04:21
Re: 8psi extra, 10rwkw extra? Chris Davey Tue, 19 July 2005 04:28
Read Message Re: 8psi extra, 10rwkw extra? Allan Tue, 19 July 2005 04:30
Re: 8psi extra, 10rwkw extra? Chris Davey Tue, 19 July 2005 04:42
Re: 8psi extra, 10rwkw extra? Chris Davey Tue, 19 July 2005 04:57
Re: 8psi extra, 10rwkw extra? JustenGT4 Tue, 19 July 2005 05:27
Read Message Re: 8psi extra, 10rwkw extra? Chris Davey Tue, 19 July 2005 05:36
Re: 8psi extra, 10rwkw extra? bbaacchhyy Tue, 19 July 2005 05:51
Re: 8psi extra, 10rwkw extra? oldcorollas Tue, 19 July 2005 06:01
Re: 8psi extra, 10rwkw extra? Chris Davey Tue, 19 July 2005 06:10
Read Message Re: 8psi extra, 10rwkw extra? oldcorollas Tue, 19 July 2005 06:51
Re: 8psi extra, 10rwkw extra? MS-75 Tue, 19 July 2005 07:22
Re: 8psi extra, 10rwkw extra? Chris Davey Tue, 19 July 2005 10:43
Re: 8psi extra, 10rwkw extra? Chris Davey Tue, 19 July 2005 21:52
Read Message Re: 8psi extra, 10rwkw extra? Chris Davey Wed, 20 July 2005 02:36
Re: 8psi extra, 10rwkw extra? 1JZ.747 Wed, 20 July 2005 02:41
Re: 8psi extra, 10rwkw extra? Chris Davey Wed, 20 July 2005 03:01
Re: 8psi extra, 10rwkw extra? 1JZ.747 Wed, 20 July 2005 05:21
Read Message Re: 8psi extra, 10rwkw extra? Chris Davey Wed, 20 July 2005 05:31
Re: 8psi extra, 10rwkw extra? gianttomato Wed, 20 July 2005 05:38
Re: 8psi extra, 10rwkw extra? gianttomato Wed, 20 July 2005 05:45
Re: 8psi extra, 10rwkw extra? THE WITZL Wed, 20 July 2005 04:38
Read Message Re: 8psi extra, 10rwkw extra? Chris Davey Wed, 20 July 2005 04:43
Re: 8psi extra, 10rwkw extra? 1JZ.747 Wed, 20 July 2005 05:34
Re: 8psi extra, 10rwkw extra? Merudo Wed, 20 July 2005 05:37
Re: 8psi extra, 10rwkw extra? 1JZ.747 Wed, 20 July 2005 06:08
Re: 8psi extra, 10rwkw extra? THE WITZL Wed, 20 July 2005 07:25
Read Message Re: 8psi extra, 10rwkw extra? Chris Davey Wed, 20 July 2005 07:28
Re: 8psi extra, 10rwkw extra? Mr DOHC Wed, 20 July 2005 08:16
Re: 8psi extra, 10rwkw extra? Chris Davey Wed, 20 July 2005 11:50
Re: 8psi extra, 10rwkw extra? Chris Davey Sat, 23 July 2005 02:49
Read Message Re: 8psi extra, 10rwkw extra? MS-75 Sat, 23 July 2005 06:20

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