Re: dual exhausts

["Graydon D. Stuckey" <graydon@apollo.gmi.edu>]

On Tue, 20 Aug 1996, todd candey wrote:

> So, it appears that the S6 is a car with an inline 5cyl, 20v turbo motor.
> Correct?

How do you divide 2 into 5 evenly?  It wouldn't make alot of sense to 
split it 3 and 2 unless you sized the twin exhausts perfectly so that a 
smaller one had 2 cylinders and a slightly larger one had 3 cylinders.  
They other option would be to split one cylinder into  two, but there 
would still be a chance that the split cylinder would flow differently as 
compared to the rest of the cylinders.  The only other option would be to 
have a small plenum after the headrer to mix all the gases, then run them 
down twin pipes, but that would defeat some of the purpose of duals in 
the first place.

> Could a dual exhaust really make enough of a performance difference to 
> justify the related expense in hardware? Anybody ever thought about 
> retrofitting this to other 20v turbo cars, or even 10v turbo cars?

A dual exhaust might be a little easier to package into the restricted 
space of the 5KCSTQ cars.

> Could this be a way to get even less restrictive exhaust than say a 
> single 3" system?

I think I'd still go for a 3" system.  (or a 2.5" system with a separate 
1.25" pipe for the wastegate only.  Just for grins :-)

Later, ---------------------------------------------------------- 
Graydon D. Stuckey 	'85 Mazda RX7 GS, no toys 
graydon@apollo.gmi.edu 	'86 Audi 5000 CS Turbo Quattro, has toys
Flint, Michigan USA	'89 Thunderbird SC, lotsa toys