Is the number of ports in engine really tied to performance?
04-24-2004 | 11:22 AM
#1
Thread Starter
Tech Adept
Joined: Mar 2004
Posts: 111
From: Hong Kong
Is the number of ports in engine really tied to performance?
Hi guys,
I have a question, is there a direct relationship between the number of ports of an engine and its performance?
e.g. Is a 3 port .12 engine really slower than a 5 port engine?
My experience is that I have a Max S5 which is a 5 port engine, on a Mugen MTX3. Then later I got a Sirio Collari modified 3 port engine. Both these engines have been running on the same car and same exhaust. However, I feel that the Sirio is a bit faster than the Max. Well really I do not have a laser gun to check what's really the speed of the car, its purely based on my feeling and the observation of my peers.
I have a question, is there a direct relationship between the number of ports of an engine and its performance?
e.g. Is a 3 port .12 engine really slower than a 5 port engine?
My experience is that I have a Max S5 which is a 5 port engine, on a Mugen MTX3. Then later I got a Sirio Collari modified 3 port engine. Both these engines have been running on the same car and same exhaust. However, I feel that the Sirio is a bit faster than the Max. Well really I do not have a laser gun to check what's really the speed of the car, its purely based on my feeling and the observation of my peers.
04-24-2004 | 02:54 PM
#3
Tech Initiate
Joined: Mar 2004
Posts: 34
From: San Diego
Adding more ports is a way of getting more port surface area without having such large ports that the piston gets stuck in them.
For example if you make the exaust port super wide, the edge of the piston can catch on it. So you make three exaust ports, one large in the center and two small ones on either side. This effectively make a much larger port to evacuate the exaust.
Intake ports are a little more complex. You are still increasing port area, but also controlling the flow rate and direction around the piston and into the chamber to increase swirl and reduce air/fuel from being thrown out the exaust port(s).
Now you take a stock 3 port and have it modified by a tuner(Rody, Colari, etc), they maximise port flow, direction, intake and exaust timing, even releave the inside of the case to obtain much of the same effects of having more ports.
This accounts for how a modified 3 port can out perform a 5 or even 7 port motor.
For example if you make the exaust port super wide, the edge of the piston can catch on it. So you make three exaust ports, one large in the center and two small ones on either side. This effectively make a much larger port to evacuate the exaust.
Intake ports are a little more complex. You are still increasing port area, but also controlling the flow rate and direction around the piston and into the chamber to increase swirl and reduce air/fuel from being thrown out the exaust port(s).
Now you take a stock 3 port and have it modified by a tuner(Rody, Colari, etc), they maximise port flow, direction, intake and exaust timing, even releave the inside of the case to obtain much of the same effects of having more ports.
This accounts for how a modified 3 port can out perform a 5 or even 7 port motor.
04-24-2004 | 08:39 PM
#4
Originally posted by DMACK
Adding more ports is a way of getting more port surface area without having such large ports that the piston gets stuck in them.
For example if you make the exaust port super wide, the edge of the piston can catch on it. So you make three exaust ports, one large in the center and two small ones on either side. This effectively make a much larger port to evacuate the exaust.
Intake ports are a little more complex. You are still increasing port area, but also controlling the flow rate and direction around the piston and into the chamber to increase swirl and reduce air/fuel from being thrown out the exaust port(s).
Now you take a stock 3 port and have it modified by a tuner(Rody, Colari, etc), they maximise port flow, direction, intake and exaust timing, even releave the inside of the case to obtain much of the same effects of having more ports.
This accounts for how a modified 3 port can out perform a 5 or even 7 port motor.
Adding more ports is a way of getting more port surface area without having such large ports that the piston gets stuck in them.
For example if you make the exaust port super wide, the edge of the piston can catch on it. So you make three exaust ports, one large in the center and two small ones on either side. This effectively make a much larger port to evacuate the exaust.
Intake ports are a little more complex. You are still increasing port area, but also controlling the flow rate and direction around the piston and into the chamber to increase swirl and reduce air/fuel from being thrown out the exaust port(s).
Now you take a stock 3 port and have it modified by a tuner(Rody, Colari, etc), they maximise port flow, direction, intake and exaust timing, even releave the inside of the case to obtain much of the same effects of having more ports.
This accounts for how a modified 3 port can out perform a 5 or even 7 port motor.
Just for instance, if everything goes as we assuming ( bunch of work and tria have been done) new generatin of PS12 will be 2 ports. Configuration will be realy interesting, but only 2 holes.
04-24-2004 | 11:22 PM
#5
Originally posted by DMACK
Adding more ports is a way of getting more port surface area without having such large ports that the piston gets stuck in them.
For example if you make the exaust port super wide, the edge of the piston can catch on it. So you make three exaust ports, one large in the center and two small ones on either side. This effectively make a much larger port to evacuate the exaust.
Intake ports are a little more complex. You are still increasing port area, but also controlling the flow rate and direction around the piston and into the chamber to increase swirl and reduce air/fuel from being thrown out the exaust port(s).
Now you take a stock 3 port and have it modified by a tuner(Rody, Colari, etc), they maximise port flow, direction, intake and exaust timing, even releave the inside of the case to obtain much of the same effects of having more ports.
This accounts for how a modified 3 port can out perform a 5 or even 7 port motor.
Adding more ports is a way of getting more port surface area without having such large ports that the piston gets stuck in them.
For example if you make the exaust port super wide, the edge of the piston can catch on it. So you make three exaust ports, one large in the center and two small ones on either side. This effectively make a much larger port to evacuate the exaust.
Intake ports are a little more complex. You are still increasing port area, but also controlling the flow rate and direction around the piston and into the chamber to increase swirl and reduce air/fuel from being thrown out the exaust port(s).
Now you take a stock 3 port and have it modified by a tuner(Rody, Colari, etc), they maximise port flow, direction, intake and exaust timing, even releave the inside of the case to obtain much of the same effects of having more ports.
This accounts for how a modified 3 port can out perform a 5 or even 7 port motor.
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