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gianttomato
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Re: how much can i port a 5m-ge head? Thu, 15 July 2004 09:17 Go to previous messageGo to previous message
You are making the claims of 9-9.5:1 CR.

Please explain how one might achieve that when you are:

  1. decreasing the swept volume,
  2. increasing the head combustion chamber capacity, and
  3. decreasing the dome of the piston.


Being such a student of the 4M, you will no doubt be aware of the 3 different types of pistons available:, flat top for post emissions motors, light dome for the 41030 head and nipple dome for the 41032 head. The capacity of the largest dome is approximately 4 cc.

Being meticulous in your preparation, you no doubt will have measured the head chamber capacity of your 5MGE head and worked it out to be approximately 62cc (a startling 21cc larger than the 41030 or 41032 heads). However, you lack the significantly larger dome of the 5MGE piston which brings the CR up to 8.8:1. You also are reducing the swept volume by a full 33 cc.

I'm sure you are fluent with the formula for calculating static compression ratio.

I suggest you do the calculations and see how 8.3:1 is derived.

I am now interested to see where you are getting 9 - 9.5:1.
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SubjectPosterDate
Read Message   how much can i port a 5m-ge head? joecoolmk2Tue, 13 July 2004 09:21
Read Message   Re: how much can i port a 5m-ge head? CrUZsidaTue, 13 July 2004 23:01
Read Message   Re: how much can i port a 5m-ge head? gianttomatoWed, 14 July 2004 04:27
Read Message   Re: how much can i port a 5m-ge head? joecoolmk2Wed, 14 July 2004 07:18
Read Message   Re: how much can i port a 5m-ge head? joecoolmk2Wed, 14 July 2004 07:19
Read Message   Re: how much can i port a 5m-ge head? gianttomatoWed, 14 July 2004 07:39
Read Message   Re: how much can i port a 5m-ge head? M.J.HWed, 14 July 2004 17:53
Read Message   Re: how much can i port a 5m-ge head? wilbo666Wed, 14 July 2004 07:40
Read Message   Re: how much can i port a 5m-ge head? joecoolmk2Thu, 15 July 2004 00:01
Read Message   Re: how much can i port a 5m-ge head? emmacThu, 15 July 2004 01:01
Read Message   Re: how much can i port a 5m-ge head? joecoolmk2Thu, 15 July 2004 01:22
Read Message   Re: how much can i port a 5m-ge head? NorbieThu, 15 July 2004 06:22
Read Message   Re: how much can i port a 5m-ge head? emmacThu, 15 July 2004 07:07
Read Message   Re: how much can i port a 5m-ge head? ed_ma61Thu, 15 July 2004 04:27
Read Message   Re: how much can i port a 5m-ge head? joecoolmk2Thu, 15 July 2004 07:23
Read Message   Re: how much can i port a 5m-ge head? ed_ma61Thu, 15 July 2004 07:30
Read Message   Re: how much can i port a 5m-ge head? joecoolmk2Thu, 15 July 2004 08:11
Read Message   Re: how much can i port a 5m-ge head? ed_ma61Thu, 15 July 2004 08:15
Read Message   Re: how much can i port a 5m-ge head? joecoolmk2Thu, 15 July 2004 08:19
Read Message   Re: how much can i port a 5m-ge head?  gianttomatoThu, 15 July 2004 09:17
Read Message   Re: how much can i port a 5m-ge head? CrUZsidaThu, 15 July 2004 08:24
Read Message   Re: how much can i port a 5m-ge head? ed_ma61Thu, 15 July 2004 08:26
Read Message   Re: how much can i port a 5m-ge head? joecoolmk2Thu, 15 July 2004 08:47
Read Message   Re: how much can i port a 5m-ge head? ed_ma61Thu, 15 July 2004 08:56
Read Message   Re: how much can i port a 5m-ge head? clubagreenieThu, 15 July 2004 08:55
Read Message   Re: how much can i port a 5m-ge head? ed_ma61Thu, 15 July 2004 08:58
Read Message   Re: how much can i port a 5m-ge head? joecoolmk2Thu, 15 July 2004 09:09
Read Message   Re: how much can i port a 5m-ge head? joecoolmk2Thu, 15 July 2004 10:06
Read Message   Re: how much can i port a 5m-ge head? gianttomatoThu, 15 July 2004 21:40
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