[FC] 140 dual/single exhaust for GB

[Dale Dewald]

Hello,

I have made two 140 size exhaust crossovers in the past couple of years: 
One for my wife's '65 Monza 110/4 with 140 exhaust logs, flowing into a 4" 
SuperTrapp muffler; the other for our '64 Greenbrier 110/4, flowing into a 
generic round muffler that "fits."

I brought a stock Corvair crossover to my local exhaust shop (a Muffler 
Shop franchise) and had them make up two sets of tubing bends, each set 
consisting of:
1) two 3" sections of tube, 1-9/16" OD to fit 140 exhaust donut gaskets.
2) two flared collars for above.
3) one cross tube from 1-3/4" OD tubing, this has a clipped 90 bend, sort 
of like an extended  turndown, and two kinks to wrap around the 
differential.  The straight end was expanded to about 1-7/8" OD to fit in 
2" tubing.
4) one clipped 1-3/4" OD elbow.
5) one 2" OD elbow with an extended tail. Car = 90, FC ~ 75 degrees
I also fabricated two clamping flanges from 5/16" steel plate.

The shop had no problem making up these parts--just a bunch of bends (not 
that it makes much difference in our remote area).  I assembled each system 
on the car starting with the tubes out of the manifolds.  I cut and fit 
until everything was lined up correctly, tack welding as I went.  Then I 
took the assembly off and MIG welded it into one piece.

Both systems have a nice low, mellow sound.  The SuperTrapp is a bit 
louder, but can be tuned by removing/adding baffles to get rid of the drone 
at 55-60 MPH.

Dale Dewald
Hancock, (UP) MI

At 08:49 PM 8/16/04 -0700, hmoore@sandiego.edu wrote:
>Keith,
>don't think its criminal to have a single exhaust on a 140.  I am trying to
>gather enough info to make (engineer) :) a single exhaust for my 140 PG 66
>monza sedan.  It may just end up being a larger diameter 110, I am still not
>sure.  >snip<  Does anyone in this
>group have any suggestions?

At 09:52 PM 8/16/04 -0400, Woohey@aol.com wrote:
>My apologies in advance, I know this topic has been discussed before, but 
>wanted to get a little advice before sending clarks $200.
>
>Does the clarks dual exhaust include all necessary hangers, is it a 
>straightforward job.  I found some old pics and it looks like someone used 
>original single muffler hangers, one on each side.  I dont remember who 
>sent those pics, but please email if possible.
>
>I will be buying in the next few days and would like to do it rite first 
>time.  The definative solution to our unique problem would be greatly 
>appreciated.