porting
Whats the best kind of port for a S5 Turbo motor? Bridge, periphial, street? Can any of them be used togethor, like a street and a bridge or a bridge and a perriphial? what do the diffrent ports do?
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Click here and read about porting.
It doesn't explain peripheral porting. Basically this is a new engine config. The intake comes in through the rotor housing and the exhaust goes out through the plates, backwards from the way it is now. This is how the rotary engine in the RX-8 is set up. |
http://fc3spro.com/TECH/PORT/porting.html
heres a page about porting with pictures |
Thanks for the links but i dont think they helped much, they just kinda showed me what they looked like. Im looking for more in-depth info on like what each one does. And what would be better for a turbo application.
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Originally posted by Project84 It doesn't explain peripheral porting. Basically this is a new engine config. The intake comes in through the rotor housing and the exhaust goes out through the plates, backwards from the way it is now. This is how the rotary engine in the RX-8 is set up. And the Rx-8 does not have any ports in the periphery of the rotor housing. They have both inlet/exhaust ports in the side plates. Peripheral porting is basically the most 'exteme' porting as far as power/efficiency at high RPMS goes. Could be made streetable aswell. |
Stick with a street port unless you want to compromise engine longevity.
A bridge port will break and possible take the whole motor with it when the bridge breaks - are you willing to take that chance? Peripheral ports are not streetable, and basically make no power under 6,000RPM. -Ted |
Originally posted by RETed Stick with a street port unless you want to compromise engine longevity. A bridge port will break and possible take the whole motor with it when the bridge breaks - are you willing to take that chance? Peripheral ports are not streetable, and basically make no power under 6,000RPM. -Ted What about a 'conservative' brideport with a fairly thick bridge? that wouldn't break nearly as easy, no? This is a pretty good read about Periphreal ports Something pretty interesting out of that thread. "This PP definetively don't bog! It takes full load from 2000 rpm (160nM torque) and idles at 1200 rpm. Mainly of a hi flowing dysa in the rotorhousing and some tuníng. Here's some more numbers. 4500rpm: 136hp 211nM 5000rpm: 145hp 208nM 5500rpm: 165hp 210nm" Which is very interesting, they definatly do make power below 6kRPM RETed. A fair bit more than stock in fact.. I'm pretty sure any factory N/A 13b motor released from mazda wasn't making anywhere near 136HP at 4,500rpms?... :) The power does seem to climb substaintially after 6kRPM, but it definatly makes better power than stock below that RPM aswell. |
Originally posted by White_FC But lots of people call bridge ports not streetable aswell... All depends how hardcore you are i guess. :) What about a 'conservative' brideport with a fairly thick bridge? that wouldn't break nearly as easy, no? Something pretty interesting out of that thread. "This PP definetively don't bog! It takes full load from 2000 rpm (160nM torque) and idles at 1200 rpm. Mainly of a hi flowing dysa in the rotorhousing and some tuníng. Here's some more numbers. 4500rpm: 136hp 211nM 5000rpm: 145hp 208nM 5500rpm: 165hp 210nm" Which is very interesting, they definatly do make power below 6kRPM RETed. A fair bit more than stock in fact.. I'm pretty sure any factory N/A 13b motor released from mazda wasn't making anywhere near 136HP at 4,500rpms?... :) The power does seem to climb substaintially after 6kRPM, but it definatly makes better power than stock below that RPM aswell. -Ted |
Since everyone will probably be too lazy to read that thread this is one line I left out...
" 8000rpm:269hp 236nm" So, 136HP @ 4.5kRPM 269HP @ 8kRPM Thats pretty good if you ask me :) Why are thin BP's a waste of time? surely if you made them well there would still be gains to be had over just a normal 'street' port? |
Originally posted by White_FC Since everyone will probably be too lazy to read that thread this is one line I left out... " 8000rpm:269hp 236nm" So, 136HP @ 4.5kRPM 269HP @ 8kRPM Thats pretty good if you ask me :) Why are thin BP's a waste of time? surely if you made them well there would still be gains to be had over just a normal 'street' port? -Ted |
Originally posted by RETed There was a guy tuning a PP, and be broke 305rwhp. Some of the more radical BP's (i.e. J-Bridge) can hit 269 also. Unless you run purpose-made PP housings, you'll need to block-fill the housings and then machine in the PP inserts; I wouldn't call this job trivial. All my point was with the HP thing was that it was making 136hp@4.5kRPM and 269hp@8kRPM... To me that is far from a radically non-linear torque curve like it sounded like you were describing. People over here are just cracking 300hp on bridgeports that don't cut into the rotor housing _at all_ (part of the class rules). Pretty fair effort I reckon. :D Ah this is one of the arguments I've got going on NoPistons Forum, and you're right...you do get some gains from a small BP. My philosophy is if you're going to compromise housing life, why not go big bridge? It's a lot of work to BP a housing, and it doesn't take much more work to port a full bridge. I do not have data on small NP's with thicker bridges, so I cannot comment on how much it affects longevity. Some of the more aggressive street ports that can come close to what a small BP can do, so why compromise? Others argue they want the BP sound, but I find that a poor choice to go with a small BP... -Ted |
Originally posted by White_FC Peripheral ports are definatly not a new thing at all, quite the contrary to that actually. Here is a peripheral port housing, courtesy of Racing Beathttp://www.racingbeat.com/photos/11018.jpg |
Originally posted by Project84 I didn't mean "new" as in it was just discovered yesterday. I mean new as in its a "new" configuration for the intake port locations. Every other port is built off of the stock location. The peripheral port uses a new location for the intake port. When I wrote that, I wondered if someone would take it out of context. Just sounded like you ment it the other way. Edit: I've always wondered why RB did their PP like that... with the port angled 'down'. MFR ones go 'straight' into the housing, no? Seems a bit counter-intuitive to put them facing 'down' against the flow of air? |
Email them and ask them why. They may have a reason for doing it. I don't know why they do it like that.
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Originally posted by White_FC Yes, definatly not a trivial job to make a PP housing... All my point was with the HP thing was that it was making 136hp@4.5kRPM and 269hp@8kRPM... To me that is far from a radically non-linear torque curve like it sounded like you were describing. People over here are just cracking 300hp on bridgeports that don't cut into the rotor housing _at all_ (part of the class rules). Pretty fair effort I reckon. :D Fair enough then, I can see your reasoning there. It's just from what i've read and what i've experienced first hand BP motors tend to have much more mid range than a big 'street' port motor, they always seem to be peaky. -Ted |
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