z00m7

I've got an '86 n/a fc and knowing that this works on n/a V8's and such to bring up the hp i thought i'd try taking off my muffler system just past the manifold. When i tried to go back and start it up it wouldn't. I'm curious if this was a fluke like a possible flood or did something in the system trip to not let it start. Or is it possible that the rotary needs the back pressure from the exhaust to catch. If anyone else has attempted this or can give me some insight i'd be much appreciative. If this or a variation of this can be done let me know. thx

-z00m

Icemark

No, in fact the least amount of back pressure is the best for a rotary.

Exhaust pressure is required for the aux ports to work, but that would not prevent the engine from starting or running.

arghx

iTrader: (3)

Just remember that you want minimal backpressure WITH maximum exhaust velocity, which is why you can't put 3.5" piping on an N/A and expect gains.

z00m7

so if possible, the best thing to do would be to run with it unbolted from the manifold?

slpin

iTrader: (9)

exactly
i do not know why people think they need back pressure


exhaust scavenging and gas velocity... NOT back pressure.

Icemark

well you would burn up your engine compartment...

remember the exhaust on a rotary can hit 1800F

slpin

iTrader: (9)

nope, because you can-not get any exhaust gas velocity doing so.

a header and a length of connecting tube (i.e. 26 inches, etc) would yield the best performance.

Icemark

because people confuse exhaust back pressure with exhaust volocity pressure.

Its like the aux ports.. they work on pressure, so people figure it must be back pressure... instead of just exhaust pressure