Difference between 4 and 6 port
Joined: Feb 2001
Posts: 29,798
Likes: 128
From: London, Ontario, Canada
Well, a 6 port engine has 6 intake ports, a 4 port engine has 4. 
The 6 ports were all NA engines from the factory. 4 ports prior to 86 were mostly NA, while after 86 they were turbocharged.
Here are some pictures of 4 port irons:
http://www.mazdatrix.com/faq/portintk.htm
Here are some pictures of 6 port irons:
http://www.mazdatrix.com/faq/port6p.htm
There is no "better". It depends on what you want to do with the engine.
There is also likely a pretty good explanation of the 6 port system in the 2nd gen FSM.
The 6 ports were all NA engines from the factory. 4 ports prior to 86 were mostly NA, while after 86 they were turbocharged.
Here are some pictures of 4 port irons:
http://www.mazdatrix.com/faq/portintk.htm
Here are some pictures of 6 port irons:
http://www.mazdatrix.com/faq/port6p.htm
There is no "better". It depends on what you want to do with the engine.
There is also likely a pretty good explanation of the 6 port system in the 2nd gen FSM.
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