RE: Exhaust fakery: Tell Me I'm Wrong
Discussion
The 4/4.3/5 litre TVR Griffith is a bit of a mystery to me. Twin pipes, 8 cylinders in two banks.....
.....and yet all four exhaust pipes each side amalgamate first into one pre-cat, and then the two pre-cats into one main cat (or one large pipe on pre-cat cars), before passing out of the engine bay as one solitary pipe to go to the silencer, which is under the middle of the car.
The two tail pipes then appear at the rear - pretending to carry the gases from each bank of cylinders. Fakery, or acceptable under the rules?
.....and yet all four exhaust pipes each side amalgamate first into one pre-cat, and then the two pre-cats into one main cat (or one large pipe on pre-cat cars), before passing out of the engine bay as one solitary pipe to go to the silencer, which is under the middle of the car.
The two tail pipes then appear at the rear - pretending to carry the gases from each bank of cylinders. Fakery, or acceptable under the rules?
QBee said:
The 4/4.3/5 litre TVR Griffith is a bit of a mystery to me. Twin pipes, 8 cylinders in two banks.....
.....and yet all four exhaust pipes each side amalgamate first into one pre-cat, and then the two pre-cats into one main cat (or one large pipe on pre-cat cars), before passing out of the engine bay as one solitary pipe to go to the silencer, which is under the middle of the car.
The two tail pipes then appear at the rear - pretending to carry the gases from each bank of cylinders. Fakery, or acceptable under the rules?
Except in a cross-plane V8 you must mix the exhaust from the two banks. Whereas in a flat plane V8 you must not mix the exhausts -- they should operate as two independent inline 4s. Except when I added Joospeed's cross-pipe to my flat-plane V8 Cerbera it was a lot better......and yet all four exhaust pipes each side amalgamate first into one pre-cat, and then the two pre-cats into one main cat (or one large pipe on pre-cat cars), before passing out of the engine bay as one solitary pipe to go to the silencer, which is under the middle of the car.
The two tail pipes then appear at the rear - pretending to carry the gases from each bank of cylinders. Fakery, or acceptable under the rules?
Noticed this: http://www.automobilesreview.com/img/land-rover-fr... - recently on a Freelander. What appears to be a straight horizontal oval exhaust is in fact a trim piece stuck on the end of a downturned exhaust exiting through a hole in the underside of the trim piece...
carl_w said:
xcept in a cross-plane V8 you must mix the exhaust from the two banks. Whereas in a flat plane V8 you must not mix the exhausts -- they should operate as two independent inline 4s. Except when I added Joospeed's cross-pipe to my flat-plane V8 Cerbera it was a lot better.
Ermmm... no. There is nothing wrong with mixing both banks as long as the exhaust pulses are separated and two don't arrive at the point of convergence together.
There are scavenging benefits to using the pulses from one bank to help scavenge the other bank. That applies to all engines irrespective crank or block configuration.
I stumbled upon this thread last night and it got me thinking again.
Have car designers/manufacturers just become so incredibly lazy? people that don't know will live with the faux, b
ks plastic exhaust trim, and those that know will change the exhaust for something decent anyway?
On a side note (no pun intended) how did they manage to get the side exit exhausts on the SLR McLaren? there must be some sort of round the car exhaust shenanigans going on with cats etc to get them back to the side of the car?
Have car designers/manufacturers just become so incredibly lazy? people that don't know will live with the faux, b
ks plastic exhaust trim, and those that know will change the exhaust for something decent anyway?On a side note (no pun intended) how did they manage to get the side exit exhausts on the SLR McLaren? there must be some sort of round the car exhaust shenanigans going on with cats etc to get them back to the side of the car?
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