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  #1  
Old 05-11-2004, 11:15 PM
26B_600HP 26B_600HP is offline
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Really Weird Question

I have been looking up more on the motors lately and read a post about boring out a rotary. I had a theoretical question for you guys. Does changing the combustion chamber recess size change the engine at all? It seems to me that it would. If bored out there could be more air pushed into the engine. Is this logical?
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Old 05-12-2004, 12:45 AM
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Re: Really Weird Question

Boring out a rotary engine? No such thing. Perhaps you have this confused with porting.
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Old 05-12-2004, 01:56 AM
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Re: Really Weird Question

I think he means machining out the recess on the surface of the rotor?
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Old 05-12-2004, 02:58 AM
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Re: Really Weird Question

if you could do that your compression would drop.
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Old 05-12-2004, 12:08 PM
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Re: Really Weird Question

Oops my bad. Yeah that's not exactly a good idea.
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Old 05-12-2004, 12:39 PM
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Re: Really Weird Question

Yeah I meant the recess on the rotor. It was just a thought I had. So changing the size on it at all it bad for performance? What if it were possible to decrease the size then? I am speaking hypothetical.
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Old 05-12-2004, 01:14 PM
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Re: Really Weird Question

I guess it could theoretically increase compression, but then it would change the "shape" of the combustion chamber. I think it's there because it needs a "concentrated" place to combust.
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Old 05-12-2004, 02:39 PM
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Re: Really Weird Question

Ok I was just thinking of something, because in an old post someone was talking about boring out a rotary and it got me thinking.
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Old 05-12-2004, 04:08 PM
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Re: Really Weird Question

there he goes with the boring out a rotary again...
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1989 RX-7 TII --- Just got rebuilt and street ported
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Old 05-12-2004, 06:31 PM
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Re: Really Weird Question

I never asked about it before Soyo, I was just thinking how to get more displacement, compression. Whatever it is to increase performance.
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Old 05-12-2004, 11:35 PM
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Re: Really Weird Question

I meant you said it in the first port, then they said you can't bore it, then you just said it in the post before mine... rotarys aren't displacement engines really, bout all there is to it
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1989 RX-7 TII --- Just got rebuilt and street ported
RB 3" dual exhaust, BNR stage 1 modified factory turbo, FCD, S-AFC II,
720cc secondaries, Aftermarket Turbo inlet duct w/K&N, Hawk HP+ pads
HKS Blow-Off Valve, Stainless brake and clutch lines
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Old 05-13-2004, 02:38 AM
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Re: Really Weird Question

to truely bore out a rotary you would have to over bore the rotor housing which would make it junk and find overbore rotors to match the the housings that now serve no purpose.
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Old 05-13-2004, 12:08 PM
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Re: Really Weird Question

yeah I know, never plan on doing it just having a thought in physics class about it. So the only thing to do to an engine when its apart is port it. Right?
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Old 05-13-2004, 04:41 PM
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Re: Really Weird Question

yea, heres a page that will give you info on ports if you need it http://home.iprimus.com.au/bluey3/portsPage/ports.htm
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1989 RX-7 TII --- Just got rebuilt and street ported
RB 3" dual exhaust, BNR stage 1 modified factory turbo, FCD, S-AFC II,
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HKS Blow-Off Valve, Stainless brake and clutch lines
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  #15  
Old 05-13-2004, 10:14 PM
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Re: Really Weird Question

you can upgrade the seals inside the engine and you can upgrade the rotor housing to third gen specs.
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