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#11
Re: Is a H89 head high or low compression ratio
Adam12
Posted on: 2009/10/13 8:00
Interesting topic...
Always wondered what the difference is between open and closed heads... ?? Adam  
#12
Re: Is a H89 head high or low compression ratio
ddgonzal
Posted on: 2009/10/13 16:27
Figure 'C' is open chamber. All the others are closed chamber.
![Open in new window](javascript:CaricaFoto("http://datsun1200.com/modules/myalbum/photos/3795.jpg");) 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.
#13
Re: Is a H89 head high or low compression ratio
Datsss
Posted on: 2009/10/13 21:43
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.
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