6 and 4 ports
#1
Junior Member
![](https://www.rx7club.com/images/misc/10_year_icon.png)
Thread Starter
Join Date: Oct 2004
Location: Guam
Posts: 7
Likes: 0
Received 0 Likes
on
0 Posts
6 and 4 ports
can someone correct me if i am wrong. is it true that all 86-91 rx7's are 6 port except the turbos that are 4 ports??? allso if i remove the air pump on the 86 it will make my rx7basically a 4 port with better top end but the bottom end would suck compared to a 6 port???
#2
Lets rock.
![](https://www.rx7club.com/images/misc/10_year_icon.png)
Join Date: Apr 2004
Location: SLC, Utah
Posts: 1,355
Likes: 0
Received 0 Likes
on
0 Posts
All 86-91 N/A 13B's are 6-port. If you remove your air pump on your '86 it won't affect your 5th and 6th ports. And if they aren't opening then bottom end stays the same and top end sucks royally. The 4 ports on a turbo motor are bigger than the 6 ports on a N/A. Mazda worked out some dynamic port induction in order to get a little more power out of a N/A motor.
#7
Mountain Rotary Mod
![](https://www.rx7club.com/images/misc/05_year_icon.png)
Join Date: Nov 2003
Location: Freaking Poland!!
Posts: 2,411
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by flamin-roids
No you can't remove the air pump from the 89-91 N/A's. The 5th and 6th ports rely on the air pump to open. The '86-'88 relies on exhaust back pressure.
Trending Topics
Thread
Thread Starter
Forum
Replies
Last Post