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peripheral portrs Q

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Old 06-03-03, 10:37 AM
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Concept Motorsports

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peripheral portrs Q

how streetable are peripheral portrs and how much hp can they make N/A ?
Old 06-03-03, 05:29 PM
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Urm what is your Idea of streetable?

A P/P Na 13b if set up correctly can make upto 300bhp (Flywheel).

They can be made more tame but you cant expect to build an engine with the most Radical style of Porting and it to behave in Trafic.

Chris
Old 06-03-03, 10:12 PM
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Ken Scheepers 13b n/a pport makes 335'ish to the wheel but would not be at all streetable with it's current setup. It is fuel injected alcohol. Best time 10.25 which is an NHRA Import record.
I would be more inclined to turbo a pport setup for a street setup and shift the intake timing up a little higher and play with a number of removeable chokes to try to gain a bit of low end torque to help the streetability but find a optimal balance to keep pulling solidly through the higher RPM range.
I don't think anybody has really worked them from that type of angle (chokes) and spent the dyno time for what I am suggesting. After all it would be pretty time consuming which equates to $$$ consuming
Old 06-04-03, 01:36 AM
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look at those airplanes that have rotarys and a PP, they make some good hp at a low rpm. 215hp @6000rpm...
if you where going to do this on the street, i think it would be a little lower since you are going to have more restrictive exhaust system.
http://powersportaviation.com/images...yno%20data.jpg

thats some nice lowend power on this baby. looks like it could be streetable.

http://powersportaviation.com/images...lation%204.JPG

thats a LONG intake manifold!
remember, long runners = more torque, short = high rpm power, just like an exhaust manifold.
Old 06-04-03, 10:30 AM
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Originally posted by OC_

thats a LONG intake manifold!
remember, long runners = more torque, short = high rpm power, just like an exhaust manifold.
Yes the long runners are going to give you more torque but the diameter of the pport tubes are so big (at least on the ones I made) that I think that will give a problem as well. It makes for a ton of intake timing if the area where the tube comes into the housing the way they are usually done.
You could make some modications to change it but I think chokes would give you a way to change it on the fly.
Old 06-04-03, 08:01 PM
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seperate butterflies for the pports I've thought about that but never tried it.... i'm still trying finish oil mods and other things before i get to the Pport intake mani...
Old 06-05-03, 10:53 AM
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Originally posted by Scalliwag
I would be more inclined to turbo a pport setup for a street setup and shift the intake timing up a little higher and play with a number of removeable chokes to try to gain a bit of low end torque to help the streetability but find a optimal balance to keep pulling solidly through the higher RPM range.
I don't think anybody has really worked them from that type of angle (chokes) and spent the dyno time for what I am suggesting. After all it would be pretty time consuming which equates to $$$ consuming
Wanna bet!

crispeed
87 RX-7 TII
9.204@150.47mph
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un-tubbed




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