rx7speed

just curious if you guys think I should get a full race cam for my RX-7?

Blackened

Sure! You must make sure you get that super special "3/4's race cam" that I hear all my buddies put in their cars ! It'll make your wankel really really fast!



p.s. Would you care to explain to me what part determins "duration" and "lift" on a wankel ? And can it be changed ?! Sorry I dont know much about Wankel engines.

84TransAm

Oh man, you can't be serious...

Beefy89

Isn't that a 2 cycle?????
Just kidding

Mark305TBI

Yeah!!! Get some good valves and valve springs to go with it! Don't forget the forged pistons and stroker crankshaft, too!!!

:hail: :lala:

Tom84L69

hardened pushrods while you're at it.

rx7speed

port size will say how much duration and "lift" I have

the reason I have lift in quotation marks is there is really nothing that will lift to let air in

but if you look at the picture I have posted below you can see you can see the intake port on the side of the housing


the rotor on the car spins and opens that up
just look in my sig or my avatar and you can see the motion the rotor moves in and how that would open and close the port

as for the exhaust port that is on the actual rotor housing itself rather then on the side so it is open all the time. though b/c where the intake and compression take place it does not mess them up.

the intake and exhaust are on the same side, just right below the intake

and with the side the port is on the rotor would spin clockwise




it is really a 4 stroke :-D

Ward

iTrader: (1)

If your gonna get a cam, you will need to build the motor up to take it. I would start with a forged crank, connecting rods, and pistons. Then a stud girdle to beef up the bottom end. And while you're doing all this you might as well get a good set of heads. Oh and dont forget the headers and exhaust to make it all sound cool.

:lala:

89formula#1

a cam??? i thought a rotary was just some triangles that exploded and spun? lol i think i will stick to american v-8's lol

Mark305TBI

If you think about it, wouldn't it be more like a 3 stroke?
1. Intake - As the rotor passes the intake port and draws the air/fuel mix into the first chamber (or whatever).

2. Compression - As the rotor forces the air/fuel mix into the little combustion area with the spark plugs.

3. Exhaust - As the rotor forces the exhaust gas out of the exhaust port.

Or since there isn't a piston does the stroke principle even apply? Wankels are too weird.

rx7speed

you forgot about the power stroke
ya know the thing right before that exhaust thingy stroke

and the rotary is not that hard to understand
I promise you that
and even though they are not true strokes so to speak in as in a piston motor it still will have all the different things a piston motor does

Mark305TBI

Now that I really examine your Avatar I think that I get it. There is a time there after the plugs fire that the rotor is moving and not yet to the exhaust port. I guess that would suffice as the power stroke. I hadn't noticed that before.