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Adam12
Re: Is a H89 head high or low compression ratio
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2009/8/31 13:34
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Interesting topic...
Always wondered what the difference is between open and closed heads... ??

Adam

Posted on: 2009/10/13 8:00
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ddgonzal
Re: Is a H89 head high or low compression ratio
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Figure 'C' is open chamber. All the others are closed chamber.

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Generally speaking, open chamber reduces spikes in temperature, hence reducing NOx pollution. However, closed chamber more thoroughly burns the mixture, resulting in best power and fuel economy.

Posted on: 2009/10/13 16:27
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Datsss
Re: Is a H89 head high or low compression ratio
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Heaps of help. I took the off last night, its a closed chamber same as A or B and has deep dished pistons. I also read aidaniels build and did,nt read anything about his head, but may have missed it.

Posted on: 2009/10/13 21:43
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