P port question
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Rican Engineering
Joined: Sep 2003
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From: orlando florida
P port question
just came across a peripheral port that is sideways , not drilled straight through the housings . ive searched but cant find anything ... anybody have pics?? or explain how that works
limey lurker
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From: Boston, UK
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Rican Engineering
Joined: Sep 2003
Posts: 141
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From: orlando florida
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limey lurker
Joined: Feb 2010
Posts: 59
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From: Boston, UK
https://www.rx7club.com/nw-rx-7-forum-33/12a-ppp-rebuild-959915/
Dyno sheet here...
https://www.rx7club.com/showpost.php...4&postcount=47
Curve just keeps climbing
it just seems the intake manifold would be a restriction, it's overkill compared to a real peripheral port which would give real results.
more work than it's worth unless you simply have not the ability to setup a peripheral manifold.
the dyno sheet is pretty respectable but it's still only going to max out well below 200 wheel horsepower, that isn't really anything noteworthy compared to the amount of fuel that thing is going to suck down and lack of bottom end response. cheater port is about the extent of it, it should add a few more HP but i wouldn't call it a night and day difference, just able to use more of each gear.
more work than it's worth unless you simply have not the ability to setup a peripheral manifold.
the dyno sheet is pretty respectable but it's still only going to max out well below 200 wheel horsepower, that isn't really anything noteworthy compared to the amount of fuel that thing is going to suck down and lack of bottom end response. cheater port is about the extent of it, it should add a few more HP but i wouldn't call it a night and day difference, just able to use more of each gear.
Last edited by RotaryEvolution; Oct 7, 2011 at 05:52 PM.
Joined: Mar 2001
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From: https://www2.mazda.com/en/100th/
however thinking about it, there are two scenarios where this hybrid port might work, although there are some IF's.
1. IF the ports can stay with a similar area as the full PP but with less overlap, total power SHOULD go up, and it SHOULD be better at lower throttle openings too. the whole problem with a full PP is that to get adequate port area, it adds a ton of overlap. if you can do bigger port area with less overlap its always good.
2. since it uses a normal intake, maybe it'll smog? or maybe if i get pulled over and the cop pops the hood its all stock still?
yeah a full PP 12A should do 50-60 more RWHP than that.... at about the same rpm
however thinking about it, there are two scenarios where this hybrid port might work, although there are some IF's.
1. IF the ports can stay with a similar area as the full PP but with less overlap, total power SHOULD go up, and it SHOULD be better at lower throttle openings too. the whole problem with a full PP is that to get adequate port area, it adds a ton of overlap. if you can do bigger port area with less overlap its always good.
2. since it uses a normal intake, maybe it'll smog? or maybe if i get pulled over and the cop pops the hood its all stock still?
however thinking about it, there are two scenarios where this hybrid port might work, although there are some IF's.
1. IF the ports can stay with a similar area as the full PP but with less overlap, total power SHOULD go up, and it SHOULD be better at lower throttle openings too. the whole problem with a full PP is that to get adequate port area, it adds a ton of overlap. if you can do bigger port area with less overlap its always good.
2. since it uses a normal intake, maybe it'll smog? or maybe if i get pulled over and the cop pops the hood its all stock still?
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