Rx-8 Engine Into A Rx-7
08-24-2003, 03:13 PM
#21
Senior Member
Join Date: Jun 2003
Posts: 203
I could care less about the rx-7 or anything, but dont bash the car, it looks great and very reliable compared to a rx-7 and it will be a better car for the everyday consumer, i.e. people who dont know one **** about rotarys. But as for us rotor heads , if mazda didnt have any faults in this car we would have nothing to do to them or improve.
08-24-2003, 05:24 PM
#22
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Join Date: Sep 2002
Location: Vanderhoof,BC(Canada)
Posts: 5,542
Originally Posted by chase78' date='Aug 23 2003, 07:24 PM
For all those people who have studied turbo thoery and have actually put them on cars put your hands in the air 
Also put you hands in the air if you know or can caluculate heat transfer,thermodynamics, of casted steel taking.
put your hands up in the air if you have a ruler can measure between the rensis intake ans exhast ports
After you have calucalted all these things and still say that a turbo is a go options as far as a performance feature that means you are not an engineer or engine rebuilder.
MAZDA if they ever plan to produce a turbo model of the engine will more then likely use a big old cast iron exhaust manifold increasing tha amount of heat that the intake port will see. A tubular exhuast is a better option but
in mass production is expensive and doesn`t last as long as a full steel.
The supercharged option it the best due to the relativly recent growth and inprovement in centrifical supercharger set ups. You don`t have any of the heat build up with the turbo exhaust manifold, and lower compression rotors will also reduce emission even further during ideal.
I have much respect of Paul and for the work that he has done in the rotary engine community in the states. I also think that the renisis is more of an eco engine then pure performance.
Also put you hands in the air if you know or can caluculate heat transfer,thermodynamics, of casted steel taking.
put your hands up in the air if you have a ruler can measure between the rensis intake ans exhast ports
After you have calucalted all these things and still say that a turbo is a go options as far as a performance feature that means you are not an engineer or engine rebuilder.
MAZDA if they ever plan to produce a turbo model of the engine will more then likely use a big old cast iron exhaust manifold increasing tha amount of heat that the intake port will see. A tubular exhuast is a better option but
in mass production is expensive and doesn`t last as long as a full steel.
The supercharged option it the best due to the relativly recent growth and inprovement in centrifical supercharger set ups. You don`t have any of the heat build up with the turbo exhaust manifold, and lower compression rotors will also reduce emission even further during ideal.
I have much respect of Paul and for the work that he has done in the rotary engine community in the states. I also think that the renisis is more of an eco engine then pure performance.
08-25-2003, 01:03 PM
#24
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Join Date: May 2003
Location: Pensacola, FL
Posts: 124
Originally Posted by chase78' date='Aug 23 2003, 10:22 AM
But three rotors really never had that problem. Torque demands on the 13/12 engine suffered since they only fires (basically) 90 degree on a cycle < the math of the epitrochoid rotation is complicated unless you know DIFFY Q or have a math program> So anyways with three rotors you have sparks at 60 degrees giving you closer power intervals.
Also put you hands in the air if you know or can caluculate heat transfer,thermodynamics, of casted steel taking.
Also put you hands in the air if you know or can caluculate heat transfer,thermodynamics, of casted steel taking.
And please tell me you were spelling Diff. Eq. (Diffy Q) funny on purpose.
Well, I can calculate the net mass transport in Sverdrup circulation, and heat exchanges in the planetary boundary layers, so I don't see how that's much harder. I could do it after reading the right book.
But soap boxes aside this thread is almost a Gen D candidate.
08-25-2003, 10:32 PM
#27
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Thread Starter
Join Date: Oct 2002
Location: Phoenix, AZ
Posts: 296
cool some one who can do some mat. it been a while since i did the equation. So I don`t know the formula off hand. They should be floating around the net some where.
As far as 60 degree and the 90 degree its more like , in general, a four banger you have two pistons in combustion and two in exhaust stroke. and with V6 you have 3 and 3. With a v8 you have 4 and 4 . So what i`m saying generally with the 3 rotor you sorta have to same thing going on.
You never heard the term Diffy Q? Maybe I`m being lazy with my words but yea Differential Equation. I think you have to do each rotor separate with mazda equation. Its been a while i did it for extra credit in my diffy Q class.
As far as 60 degree and the 90 degree its more like , in general, a four banger you have two pistons in combustion and two in exhaust stroke. and with V6 you have 3 and 3. With a v8 you have 4 and 4 . So what i`m saying generally with the 3 rotor you sorta have to same thing going on.
You never heard the term Diffy Q? Maybe I`m being lazy with my words but yea Differential Equation. I think you have to do each rotor separate with mazda equation. Its been a while i did it for extra credit in my diffy Q class.
08-31-2003, 02:40 PM
#29
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Join Date: Dec 2002
Location: Wayne, NJ
Posts: 4,837
Originally Posted by chase78' date='Aug 25 2003, 10:32 PM
As far as 60 degree and the 90 degree its more like , in general, a four banger you have two pistons in combustion and two in exhaust stroke. and with V6 you have 3 and 3. With a v8 you have 4 and 4 . So what i`m saying generally with the 3 rotor you sorta have to same thing going on.
each cylinder fires at a different time, otherwise it would be inefficent and uncomfortable, ever felt an engine with a misfire? thats how it would feel only ten times worst.
for someone who seems to think they know everything about rotary you need to learn something about pisstons.
to complete the 4 strokes in all cylinders it requires 720 degrees of crankshaft rotation (no matter how many cylinders you have)
kevin.
09-01-2003, 03:36 AM
#30
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Join Date: Oct 2002
Location: Phoenix, AZ
Posts: 296
thats why i said in general
There are no such things as 1 cylinder engines becuase you need another one due the power stoke and the other to be in the exhaust stroke. So is general at a given time a v8 has four cylinders in ehast phase and four in power phase.
Some body kill this topic off [SIZE=14]
There are no such things as 1 cylinder engines becuase you need another one due the power stoke and the other to be in the exhaust stroke. So is general at a given time a v8 has four cylinders in ehast phase and four in power phase.
Some body kill this topic off [SIZE=14]