[FC] dual exhaust

[Rad Davis]

As an addition to Dad's usual helpful and informative post, it's worth 
noting that 140 HP exhaust logs work just fine on 80-110 HP engines with 
110 packings to the heads, and offer somewhat less restriction.  So you 
have the option of using either 110 or 140 U pipes as your source material, 
and just need to choose your manifolds (and manifold to J pipe packings) to 
match.

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Rad Davis:                                        rad.davis at comcast.net
Corvairs--65, 66 Corsa coupes, '65 'brier Deluxe   http://www.corvair.org/
Keeper of the Forward Control Corvair Primer: 
http://www.mindspring.com/~corvair/fc1.html
"We did Nebraska in seven minutes today. I think that's probably the best 
way to do Nebraska."                            --Brian Shul, _Sled Driver_


At 03:01 PM 12/8/2005 -0600, you wrote:
>Ok since you have some experience and perspective under an FC here 
>goes.  The cars mufflers are tucked along side the engine using valve 
>cover/muffler heat shields and muffler tail pipes that exit to the side of 
>the rear of the car  .  On the FC's, the mufflers are out at the edge of 
>the rear valence and exit almost straight to the rear.  Thus, the car's 
>right "U tube makes a 180 degree bend and the FC's need a 165 degree bend 
>to fit the FC muffler hanger.  The cars right muffler hanger is 5 inches 
>from the top bolt hole to the closest side of the 6x9 oval muffler.  A 
>look at the latest Communique's Clark's add. shows the difference in exit 
>angles.  On the right side the FC muffler hanger/support is 14 inches from 
>the top bolt hole to the nearest corner of the six inch round 
>muffler.  The car "U" can be bent out (if heated) to fit the right 
>side.  The left side is worse.  My home made left hanger is 22 inches from 
>the top hole to the muffler.  The left side "U" tube must be spaced out to 
>get the correct angle to match the right.  Basically you saw the "U" tube 
>in half and insert a 6 inch piece of straight pipe between the two "J" 
>tubes.  Most six inch mufflers have a two inch id inlet tube so pipe 
>adapters and various tube extensions are needed.
>     Common mufflers used for FC's are for the Chrysler "K" car and the 
> Ford Granada.  Any muffler shop will have many suitable mufflers in the 
> six inch dia and 14 to 18 inches in length.  Unlike the car there is lots 
> of room under an FC for a long muffler.
>      If you are planning to put duals on an engine with the small exhaust 
> manifolds, the larger 1.75 inch 140 "U" pipes won't fit 
> properly.   Venders do sell the 1.5 inch "U" tubes for the 
> 80/98/102/95/110 engines.
>Jim Davis
>
>
>
>.At 10:06 AM 12/8/2005, you wrote:
>>Jim;- I did anticipate this dual exhaust conversion early on, so i
>>fabricated a "box" under the battery box to house the new muffler and
>>copied the shape and dimensions of the space on the pass.side. (I had to
>>replace that area too) The sides and floor of the original battery box
>>were completely gone save a little of the "L" brackets that once held the
>>battery tray. I guess I need to know what type of muffler will fit the U-
>>pipes?? A second round unit like on the rt. side? the bottoms of the rear
>>quarter panel and the rear valence panel are pretty much cancered away so
>>it will be nothing to build in a notch for the exhaust pipe tip on the
>>left side too. Why is theU- pipe angle wrong? does it need to bend up or
>>down?
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