BP'ing a 6Port
11-20-02, 11:33 PM
#26
mad scientist
The powerband wont be huge, it will be VERY high. It wont be very usable with it beign that high. Youre placing many times more stress on the components than they were designed to handle. It wont last long without lots of money thrown into it.
The port area doesnt have nearly much effect as port timing. BP's have higher powerbands mainly from the timing. The area is mainly to raise the VE by reducing restriction of the port. The port area needs to be matched to the port timing to get optimum performance. Its very similar to camshafts for piston engines. Ever noticed how longer duration cams always have more lift, even if only slightly? Same principle.
The port area doesnt have nearly much effect as port timing. BP's have higher powerbands mainly from the timing. The area is mainly to raise the VE by reducing restriction of the port. The port area needs to be matched to the port timing to get optimum performance. Its very similar to camshafts for piston engines. Ever noticed how longer duration cams always have more lift, even if only slightly? Same principle.
11-21-02, 12:18 PM
#29
I am the Anti-Ch(rice)t
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well, our engines have somthing called a side seal. And unfortunately, the side seal goes right by the intake ports. When we make the ports bigger on an engine, if we make them too big, it goes into the area where the side seals ride, and we cant do that cuz oil can come into the engine.
I guess I am beganning to think like that as well
It's kind of hard to make good power from a 1.3 liter non turbo. On the rx7.com site they have world record times for rotarys and the factory-port fastest n/a in the world was 14.1 sec in the quater. Which is SAD.
It's kind of hard to make good power from a 1.3 liter non turbo. On the rx7.com site they have world record times for rotarys and the factory-port fastest n/a in the world was 14.1 sec in the quater. Which is SAD.
Justin
11-21-02, 12:19 PM
#30
Super Newbie
Originally posted by RX-7Impreza
no it isnt hard to make good power. in the all motor class in NHRA a rotary is number one on the points list.
no it isnt hard to make good power. in the all motor class in NHRA a rotary is number one on the points list.
11-21-02, 12:54 PM
#31
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OC, Go to any one of the numerous sites that have the moving pics of rotary port timing. When you see them in action you'll realize that when you make a bridge port it advances the port timing regardless of how small the port itself is. Its a function of the location of the "eyebrow" and where the rotor seals the port opening. I was very tempted to bridge my 6 ports, but decided against it in favor of longevity.
11-21-02, 11:45 PM
#32
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Originally posted by Felix Wankel
Its a PP 20B though, not a two rotor...
Its a PP 20B though, not a two rotor...
if you compare the rotary to engines with similar displacement, size, or fuel economy engines. it fares well if not better than its *boing boing* cousin
Justin
11-22-02, 12:03 AM
#33
mad scientist
Originally posted by RX-7Impreza
yeah but look what he is up against. 1.3L rotary NA power is not inexistant. you can have a fast car with NA. it probably wont be too streetable. but high hp NA engines of ANY type arent user friendly.
if you compare the rotary to engines with similar displacement, size, or fuel economy engines. it fares well if not better than its *boing boing* cousin
Justin
yeah but look what he is up against. 1.3L rotary NA power is not inexistant. you can have a fast car with NA. it probably wont be too streetable. but high hp NA engines of ANY type arent user friendly.
if you compare the rotary to engines with similar displacement, size, or fuel economy engines. it fares well if not better than its *boing boing* cousin
Justin
Second, since when is 300 rwhp(seen it done on a PP, they just dont last that long) nonexistant as far as power goes?
11-22-02, 12:06 AM
#34
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damn them and banning the rotaries. how is it fair?? if one engine is better than another, isnt that the point of racing??? to find out who is better with what engine??
Justin
Justin
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