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Total 12 documents matching your query.

1. [Fot] piston/head clearance (score: 1): Author: tr4racing at googlemail.com (tr4racing at googlemail.com); Date: Thu, 24 Aug 2017 00:07:52 +0200; On dyno test we found a disturbing issue that lowers the power if the piston to head clearance is less than 0.039?. We didn?t find a cause for this but tested thoroughly clearances from 0.0236? upwar; /html/fot/2017-08/msg00051.html (13,282 bytes)
2. [Fot] piston/head clearance (score: 1): Author: jhasty at mhc-law.com (John Hasty); Date: Wed, 23 Aug 2017 22:47:00 +0000; An HTML attachment was scrubbed... URL: <http://autox.team.net/pipermail/fot/attachments/20170823/dae424b4/attachment.html>; /html/fot/2017-08/msg00052.html (7,915 bytes)
3. [Fot] piston/head clearance (score: 1): Author: kaskastner at gmail.com (Kas Kastner); Date: Wed, 23 Aug 2017 18:46:23 -0700; This is a very interesting subject. In the thousands of hours of dyno testing I did in the 60's, the squish area clearance was never addressed with exception of making certain the piston did not hit; /html/fot/2017-08/msg00053.html (20,379 bytes)
4. [Fot] piston/head clearance (score: 1): Author: ponobill at gmail.com (Bill); Date: Wed, 23 Aug 2017 21:19:13 -0700; The theory about squish area in two strokes is that besides generating turbulence (thus mixing) and moving the majority of the mix to the middle of the head, that the relatively cool surfaces in clos; /html/fot/2017-08/msg00054.html (23,642 bytes)
5. [Fot] piston/head clearance (score: 1): Author: mdporter at dfn.com (Michael Porter); Date: Wed, 23 Aug 2017 22:52:18 -0600; There's probably some arcane and obscure hydrodynamics formula that explains this phenomenon, of which I'm completely unaware, but, thinking this through, I doubt that the effects on turbulence at pr; /html/fot/2017-08/msg00055.html (11,687 bytes)
6. [Fot] piston/head clearance (score: 1): Author: rkrantz77 at comcast.net (Ron KRANTZ); Date: Thu, 24 Aug 2017 13:14:26 -0400 (EDT); I will chime in with my experience on Spitfires. Bill is right in regards to the importance of flame front and complete combustion. When I remove a head the first thing I look at is the top of the pi; /html/fot/2017-08/msg00057.html (35,377 bytes)
7. [Fot] piston/head clearance (score: 1): Author: toodamnfunky at comcast.net (Jim Gray); Date: Thu, 24 Aug 2017 12:49:39 -0600; Chris, I finding it interesting you saw best power at .472. How much change in compression ratio did you get from .023 to .047. Im assuming you tried different ignition timing and at what Compression; /html/fot/2017-08/msg00059.html (17,419 bytes)
8. [Fot] piston/head clearance (score: 1): Author: tr4racing at googlemail.com (tr4racing at googlemail.com); Date: Thu, 24 Aug 2017 21:05:33 +0200; Hi Jim, the change in compression ratio is not that big. My compression ratio is around 11.3:1. So with the thicker gasket you get 10.9, with the thinnest 11.5?.so just about these values. It doesn?t; /html/fot/2017-08/msg00060.html (14,637 bytes)
9. [Fot] piston/head clearance (score: 1): Author: kaskastner at gmail.com (Kas Kastner); Date: Thu, 24 Aug 2017 12:48:45 -0700; i don't think is .472" Jim that is almost a half inch. I think you forgot the "0" . *Never be beaten by equipment.* On Thu, Aug 24, 2017 at 11:49 AM, Jim Gray via Fot <fot at autox.team.net> wrote: -; /html/fot/2017-08/msg00061.html (19,134 bytes)
10. [Fot] piston/head clearance (score: 1): Author: fubog1 at aol.com (fubog1); Date: Thu, 24 Aug 2017 18:35:29 -0400; That's a significant difference in CR. I'm still trying to wrap my mind around how extra piston/head clearance is a power gain, but I can't argue with real world dyno tests, all being equal, CR inclu; /html/fot/2017-08/msg00063.html (15,647 bytes)
11. [Fot] piston/head clearance (score: 1): Author: gregmogdoc at surfnetusa.com (Greg Solow); Date: Mon, 4 Sep 2017 18:57:09 -0700; In all of the research and reading I have ever done the idea has always been to have the clearance between the head and the top of the piston at tdc as small as possible with no actual contact. This; /html/fot/2017-09/msg00000.html (9,450 bytes)
12. [Fot] piston/head clearance (score: 1): Author: jwheeler1947 at yahoo.com (Jack Wheeler); Date: Tue, 5 Sep 2017 16:20:57 +0000 (UTC); Hi Greg.? I was interested in your comments below.? It sounds like the extreme engine you built is very similar to the SCCA legal engines I was running in my TR-4 the last few years I was racing.? I; /html/fot/2017-09/msg00002.html (10,859 bytes)

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