Why did Porsche move to a 3.6L with the 996
Why did Porsche move to a 3.6L with the 996
What year did they make the transition from the 3.4L to the 3.6L and why did they make the change? New to the Porsche scene, have been involved with rotaries all my life.
Yeah I thought it was in 02, I realize it produces more power but was that the major reason, to have a better platform with more displacement? Is there anything different about the characteristics of the engines? Same compression and bore/stroke? I haven't been able to find a ton of info searching around the net.
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Yeah I thought it was in 02, I realize it produces more power but was that the major reason, to have a better platform with more displacement? Is there anything different about the characteristics of the engines? Same compression and bore/stroke? I haven't been able to find a ton of info searching around the net.
The displacement increase was achieved by increasing the stroke from 78mm to 82.8mm (the bore remained the same at 96mm). The changes may seem relatively minor on the surface but in fact more than 80 percent of the components in the 3.6 liter engine were new.
According to "The Porsche 911 Story", the decision to increase the stroke (rather than the bore, which was/is possible) was dictated by the fact that the increased stroke resulted in a combustion chamber that has a lower surface to volume ratio (than would have been possible if the bore size was increased). This gave the new motor fewer heat losses, better torque, and lower fuel consumption.
As part of the changes the new motor also got new heads, variocam plus, a new crank, larger main bearings, new cams, larger valves, a higher capacity oil pump and a host of other improvements.
More power is the reason.
The displacement increase was achieved by increasing the stroke from 78mm to 82.8mm (the bore remained the same at 96mm). The changes may seem relatively minor on the surface but in fact more than 80 percent of the components in the 3.6 liter engine were new.
According to "The Porsche 911 Story", the decision to increase the stroke (rather than the bore, which was/is possible) was dictated by the fact that the increased stroke resulted in a combustion chamber that has a lower surface to volume ratio (than would have been possible if the bore size was increased). This gave the new motor fewer heat losses, better torque, and lower fuel consumption.
As part of the changes the new motor also got new heads, variocam plus, a new crank, larger main bearings, new cams, larger valves, a higher capacity oil pump and a host of other improvements.
The displacement increase was achieved by increasing the stroke from 78mm to 82.8mm (the bore remained the same at 96mm). The changes may seem relatively minor on the surface but in fact more than 80 percent of the components in the 3.6 liter engine were new.
According to "The Porsche 911 Story", the decision to increase the stroke (rather than the bore, which was/is possible) was dictated by the fact that the increased stroke resulted in a combustion chamber that has a lower surface to volume ratio (than would have been possible if the bore size was increased). This gave the new motor fewer heat losses, better torque, and lower fuel consumption.
As part of the changes the new motor also got new heads, variocam plus, a new crank, larger main bearings, new cams, larger valves, a higher capacity oil pump and a host of other improvements.
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there is a lot of discussion and pointers to indepth information on this topic on renntech.org. they weren't just chasing horsepower. many of the design decisions porsche made were based on failure analysis on blown engines.
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Porsche had been putting 3.6's in their 911's since 1989 (Carrera 4) and decided to bump up the displacent in a Boxster motor when they went the watercooled route in 99. They bumped it up again (It should have never been a 3.4 IMO) in 02.
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what he said ...
More power is the reason.
The displacement increase was achieved by increasing the stroke from 78mm to 82.8mm (the bore remained the same at 96mm). The changes may seem relatively minor on the surface but in fact more than 80 percent of the components in the 3.6 liter engine were new.
According to "The Porsche 911 Story", the decision to increase the stroke (rather than the bore, which was/is possible) was dictated by the fact that the increased stroke resulted in a combustion chamber that has a lower surface to volume ratio (than would have been possible if the bore size was increased). This gave the new motor fewer heat losses, better torque, and lower fuel consumption.
As part of the changes the new motor also got new heads, variocam plus, a new crank, larger main bearings, new cams, larger valves, a higher capacity oil pump and a host of other improvements.
The displacement increase was achieved by increasing the stroke from 78mm to 82.8mm (the bore remained the same at 96mm). The changes may seem relatively minor on the surface but in fact more than 80 percent of the components in the 3.6 liter engine were new.
According to "The Porsche 911 Story", the decision to increase the stroke (rather than the bore, which was/is possible) was dictated by the fact that the increased stroke resulted in a combustion chamber that has a lower surface to volume ratio (than would have been possible if the bore size was increased). This gave the new motor fewer heat losses, better torque, and lower fuel consumption.
As part of the changes the new motor also got new heads, variocam plus, a new crank, larger main bearings, new cams, larger valves, a higher capacity oil pump and a host of other improvements.
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