Mazda Rotary Club

General => General Technical => Topic started by: grinder on December 30, 2002, 12:20:56 PM

Title: exhaust
Post by: grinder on December 30, 2002, 12:20:56 PM
well im on a roll today so ...

when i look down the side of the engine to where the exhaust comes out - it comes out in TWO seperate pipes

is this a standard thing - cause when i look at the haynes manual it shows as an exhaust block attached to the engine

thanks

stu
Title: exhaust
Post by: Glenn Butcher on December 30, 2002, 01:51:07 PM
Stu,

Turbo engines will have one pipe out the back of the turbo.

Non-turbo may have the two pipes, depending on whether or not the exhuast is standard.

Is yours the non-turbo model? (no bonnet scoop).
Title: exhaust
Post by: grinder on December 30, 2002, 03:30:42 PM
mine is a Non Turbo and it has 2 large exhaust pipe coming out of the engine - i was wondering if this is correct !

( not sure if it has an aftermarket exhaust but i have a reciept for a Jan Speed exhaust )
Title: exhaust
Post by: Glenn Butcher on December 30, 2002, 03:53:11 PM
Yep - sounds like an aftermarket exhaust (nice!) the factory exhaust runs what they call a "Thermal Reactor" , or "Heat Exchanger"  big round cast iron thing (looks completely different to what you have, and what is used on the turbo cars).
Title: exhaust
Post by: grinder on December 31, 2002, 09:27:41 AM
cooooooooooooooooool !

will this give me any performance difference with that and the K&N panel filter ???
Title: exhaust
Post by: Glenn Butcher on December 31, 2002, 10:11:42 AM
Yes - it would be better than standard for sure.  I would only run Shell Optimax in it though (to make sure it is always running rich).
Title: exhaust
Post by: grinder on December 31, 2002, 10:21:59 AM
funny that you should mention that the car runs very rich ( you can smell the petrol )

i was gonna try and adjust the mixture/timing - maybe i should judst leave it ??

thanks

stu
Title: exhaust
Post by: hIGGI on December 31, 2002, 10:41:05 AM
u can`t adjust mixture if u don`t have any piggyback or standalone ECU....

2 pipes from motor = header....on non turbo its way to get most power .....
Title: exhaust
Post by: grinder on December 31, 2002, 12:04:55 PM
do you know how much more power ??

or am i best getting it on a rolling road !
Title: exhaust
Post by: Glenn Butcher on December 31, 2002, 05:18:05 PM
A good exhaust on a non-turbo rotary can give you up to 25hp extra.  So it would definitely be better than standard.  The best way would be on a dyno yes.