Is Backpressure Critical?

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01-19-2003, 09:41 PM

#11

winger

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rocket scientist

01-19-2003, 10:37 PM

#12

j9fd3s

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well put!

mike

01-20-2003, 04:11 PM

#13

Stripgear

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Quote:

The ideal exhaust system on a rotary would have a perfect vacuum right at the exhaust port

This is why RX-7's make excellent vehicles for space travel.

01-20-2003, 04:36 PM

#14

j9fd3s

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as the judge keeps pointing out, we do live in a rotary universe

mike

01-20-2003, 04:45 PM

#15

teknics

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so with that whole vaccuum thingy i should get one of those boat water pumps, rig it in place of the cat so it's sucking exhaust out and i'll see hp gains? great that'll be the next hot ricer item "put a wind tunnel in your exhaust!"

kevin.

01-20-2003, 06:12 PM

#16

j9fd3s

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borla has those "intercooled" tips....

mike

01-20-2003, 07:48 PM

#17

treceb

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right, like peristaltic pumps... constant flow equals no air contamination. now, why didnt i think of that.

01-20-2003, 10:57 PM

#18

Shpook

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on my old 12a, i ran a RB header straight back thorugh 2 1/2 pipe, and ending in a crappy *** MagnaFlow muffler. Now keep in mind, i only had (IMO) about 160hp or so. I've never heard an RX-7 sound as sweet as this setup did, although it was loud as hell(well, excluding heavily modded engines).

Also, zebrenoir, on a piston engine, back pressure is also used for the scavengeing effect. It's used to help pull the intake valves open as the exhaust valves close. Of course, in a rotary, this isn't needed, since there is no valvetrain. Ahh, the wonderful world of rotary!