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Bill Sherwood
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....

Thu, 14 October 2004 15:17

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FWDboy wrote on Fri, 15 October 2004 00:51

So what is more important in calcuating an approximate redline - the peak piston speed or the average piston speed? Surely there are more important factors though, like skirt length, oil/compression ring surface area, harmonics/rod strength???

Average piston speed, though as far as I know the shorter the rod (I.e. rod-to-stroke ratio) the higher the piston accelerations for a given stroke. So in that respect a longer rod should be easier on the pistons.

As far as the limiting factor, it's often the rod bolts. Twin-cam multi-valve engines often aren't limited by the valve gear with regard to max revs as they'er much lighter than a two-valve, and even more than a push-rod engine.
Some engines get bad harmonic in the cranks at certain revs, so that's an area to stay away from, others might even have the oil pump fail before anything else.
But for our purposes it's usually the rod bolts.

Always change them, every rebuild.

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Read Message ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Mon, 11 October 2004 14:59
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... oldcorollas Mon, 11 October 2004 15:13
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Mon, 11 October 2004 15:16
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Mon, 11 October 2004 15:23
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... bbaacchhyy Mon, 11 October 2004 21:25
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... takai Mon, 11 October 2004 21:43
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... bbaacchhyy Mon, 11 October 2004 22:15
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... Steve_Reynolds Mon, 11 October 2004 23:10
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... gianttomato Mon, 11 October 2004 23:22
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... Ben Wilson Tue, 12 October 2004 05:25
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... gianttomato Wed, 13 October 2004 13:05
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... thechuckster Wed, 13 October 2004 13:38
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... oldcorollas Wed, 13 October 2004 13:51
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Wed, 13 October 2004 14:45
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... Bill Sherwood Wed, 13 October 2004 14:48
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Wed, 13 October 2004 15:04
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Wed, 13 October 2004 14:58
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... Bill Sherwood Wed, 13 October 2004 15:06
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... Bill Sherwood Wed, 13 October 2004 15:07
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Wed, 13 October 2004 15:30
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Wed, 13 October 2004 15:40
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... Bill Sherwood Wed, 13 October 2004 15:40
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Wed, 13 October 2004 15:42
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... Bill Sherwood Wed, 13 October 2004 15:45
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Wed, 13 October 2004 15:50
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... bbaacchhyy Wed, 13 October 2004 21:36
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Thu, 14 October 2004 01:34
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... bbaacchhyy Thu, 14 October 2004 02:08
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Thu, 14 October 2004 02:26
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... moo4AGZETA22 Thu, 14 October 2004 02:49
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... bbaacchhyy Thu, 14 October 2004 03:09
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... gianttomato Thu, 14 October 2004 03:52
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Thu, 14 October 2004 04:15
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... gianttomato Thu, 14 October 2004 04:27
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... bbaacchhyy Thu, 14 October 2004 05:06
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... gianttomato Thu, 14 October 2004 05:21
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... bbaacchhyy Thu, 14 October 2004 05:32
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... boxh34d Thu, 14 October 2004 12:21
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Fri, 15 October 2004 00:22
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... justcallmefrank Fri, 15 October 2004 00:39
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... mrshin Thu, 14 October 2004 12:54
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... RWDboy Thu, 14 October 2004 14:51
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... Bill Sherwood Thu, 14 October 2004 15:17
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... gianttomato Thu, 14 October 2004 21:25
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Thu, 14 October 2004 23:42
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Fri, 15 October 2004 00:33
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Fri, 15 October 2004 00:46
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... justcallmefrank Fri, 15 October 2004 00:50
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Fri, 15 October 2004 00:51
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... justcallmefrank Fri, 15 October 2004 00:56
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... justcallmefrank Fri, 15 October 2004 01:00
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Fri, 15 October 2004 02:35
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... SupraPete Fri, 15 October 2004 02:55
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... SupraPete Fri, 15 October 2004 02:45
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Fri, 15 October 2004 02:59
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Fri, 15 October 2004 03:01
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... SupraPete Fri, 15 October 2004 03:11
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... SupraPete Fri, 15 October 2004 03:21
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... SupraPete Fri, 15 October 2004 03:14
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... RWDboy Fri, 15 October 2004 03:19
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Fri, 15 October 2004 03:26
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... SupraPete Fri, 15 October 2004 03:28
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Fri, 15 October 2004 03:35
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... gianttomato Fri, 15 October 2004 03:55
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... Bill Sherwood Fri, 15 October 2004 04:44
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Fri, 15 October 2004 04:50
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... CelicaRA45 Sat, 16 October 2004 03:38
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... mrshin Sat, 16 October 2004 13:30
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... Bill Sherwood Sat, 16 October 2004 13:55
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... mrshin Sat, 16 October 2004 14:37
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... RWDboy Sun, 17 October 2004 08:29
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Sun, 17 October 2004 10:12
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... RWDboy Sun, 17 October 2004 11:12
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Sun, 17 October 2004 12:13
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... Bill Sherwood Sun, 17 October 2004 13:19
Read Message Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... ed_ma61 Sun, 17 October 2004 22:55
Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts.... Bill Sherwood Mon, 18 October 2004 02:40

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