<VV> turbo mufflers on a 140

[Bill Elliott]

The Corvair turbo muffler was less restrictive than the baffled mufflers 
of the day (and in fact is where we get the term "turbo muffler" from as 
it was the first of the breed). However, modern turbo mufflers are much 
more free flowing with even less backpressure... while Chevy wanted less 
backpressure than the standard mufflers, they also needed to fairly 
tightly control the sound level. This also gave them some backpressure 
that helped to reduce peak boost, but I believe the tiny carb was the 
primary boost restrictor.

Bill

corsaconvertible wrote:

>I always thought the Corvair turbo muffler was designed to be more
>restrictive, to limit the turbo boost to around 10 PSI and keep the
>engine from self-destructing. This was cheaper than using a wastegate.
>Tony Hansen
>
>On Tue, Jul 1, 2008 at 2:16 PM, Mel Francis <mfrancis at wi.rr.com> wrote:
>  
>
>>The best reason for using a pair of Turbo mufflers on a 140, would not
>>really be the sound,
>>but for the further reduction in back pressure that can be attained, over
>>the stock Corvair mufflers.
>>
>>Turbo mufflers were originally designed with larger internal chambers, to
>>provide a lower final
>>resistance to the exhaust system, since any flow resistance behind the
>>turbo, slows the overall top speed
>>of the turbo and hence, the car.
>>
>>I've used original Corvair Turbo mufflers on big-block Corvettes years ago,
>>for the same reason, and
>>presenly have one, including the original chrome Turbo exhaust tip, on my
>>'77 V8 Monza.
>>
>>Mel Francis
>>'65 Monza convertible
>>'77 Monza 2+2
>>    
>>
>atabase: 270.4.3/1528 - Release Date: 7/1/2008 7:26 AM
>  
>