4 or6 port
01-25-2002, 10:12 PM
#4
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I heard ten a few sites state that there is a 3 intake and 2 exhaust valves per rotor, that means Five times 2 which is ten. This is very unofficial, but this is the site, anybody else have another site?
Renesis Specs MIGHT BE WRONG
Renesis Specs MIGHT BE WRONG
02-01-2002, 08:53 AM
#7
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We have to count like Mazda does. My 91NA 6-port actually has 8: 2-exhaust, 2-center plate intake, 4-end plate intake. Since they don't count the center plate, it's still a 6-port??
02-01-2002, 09:35 AM
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OK - Here it is
Excerpt from 1-8-02 press release:
RENESIS, the key to MAZDA RX-8's front-midship layout, features a side-intake, side-exhaust layout, with the exhaust ports moved to the side housing of the rotor chamber. This allows the size of the ports to be freely set, resulting in an expanded air-intake port area which is 30 percent larger than in conventional rotary engines. This greatly improves intake resistance and contributes to an output of 250 hp at 8,500 rpm and maximum torque of 162 lb-ft at 7,500 rpm without having to rely on a turbo- or supercharger.
In addition, the adoption of dual exhaust ports for each chamber achieves twice the port area of conventional designs and also allows exhaust port timing to be delayed for increased thermal efficiency in the expansion process. Unburned hydrocarbons are retained for combustion in the next cycle, which greatly reduces emissions. A three-stage induction system, featuring shutter valves at the intake ports of each rotor, utilizes the incoming air’s dynamic charge effect and improves filling efficiency, while twin electronic throttles precisely and flexibly control the valve operation. Furthermore, a wet-sump lubrication system with oil-pan height just half that of conventional designs also reduces engine size and weight.
Excerpt from 1-8-02 press release:
RENESIS, the key to MAZDA RX-8's front-midship layout, features a side-intake, side-exhaust layout, with the exhaust ports moved to the side housing of the rotor chamber. This allows the size of the ports to be freely set, resulting in an expanded air-intake port area which is 30 percent larger than in conventional rotary engines. This greatly improves intake resistance and contributes to an output of 250 hp at 8,500 rpm and maximum torque of 162 lb-ft at 7,500 rpm without having to rely on a turbo- or supercharger.
In addition, the adoption of dual exhaust ports for each chamber achieves twice the port area of conventional designs and also allows exhaust port timing to be delayed for increased thermal efficiency in the expansion process. Unburned hydrocarbons are retained for combustion in the next cycle, which greatly reduces emissions. A three-stage induction system, featuring shutter valves at the intake ports of each rotor, utilizes the incoming air’s dynamic charge effect and improves filling efficiency, while twin electronic throttles precisely and flexibly control the valve operation. Furthermore, a wet-sump lubrication system with oil-pan height just half that of conventional designs also reduces engine size and weight.
02-11-2002, 01:22 AM
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4 port Vs 6 port only counts the intake ports... The primaries on all 13bs have been 2 ports (one for each rotor housing), the end plates will either have 1 or 2 ports... so, you add up the number of intake ports per rotor.... thats how you count the ports....
08-05-2010, 02:10 PM
#19
08-07-2010, 10:05 AM
#25
RX8 & RX7 owner
