quieter exhaust possible?

I have a 68 w/ 225. Headers. Some sort of saginaw? steering. I have a set of original manifolds but I'm pretty sure they will hit the steering shaft or be very close, I took some measurements. I have the headers going into some short oval cheapy "raptor" mufflers ( 10 inch long, maybe) then 90* and out. My question is without changing a heck of a lot, how can I make this thing quieter? I tried turning them down, still too loud. I would like to put stock ex back on but not possible I'm afraid. Does anyone make some sort of insert for the end that quiets things down?

Josh

 

Look up Chrslyer Imperial mufflers.
We use to put them on HEMI cars and they had a sweet tone to them, not load till you dumped the fuel!!!

 

I don't know if you can run pipe along the frame out the back with the stock axles and fenderwell headers, but that is what I did with my Waggie swap. It really cut down on the noise, and the smell at lower speeds too. I used 1.75" pipe, since that is what I could find at the time and a cheap pipe bender. If the picture shows up, it should be self explanitory.... Adding pipe length will help with the sound volume as much as the muffler it's self.

 

You can use a stock exhaust manifold for the driver's side from a '80's vintage Buick passenger car that has a V6 in it. It's pretty flat and you can just sneak the steering shaft by it. Try doing a search on this site for exhaust manifold and you may get some more info.

 

If I throw an 80's manifold on the driver's and an original on the pass. ,
won't that change the balance between Lt and Rt sides causing it to shake? I'm interested in that straight pipe out the end deal. Does that really make it alot quieter?

Josh

 

Yea it does. I just went the other way taking the stock off and putting headers on. The stock was coming out the rear drivers with a cross over in the middle. I used headman hedders because of my saginaw steering conversion.

 

I used a stock passenger manifold, an 80's Buick driver manifold and ran a single 2.5" inside the frame and over the rear axle and out the back and it's about 10x quieter than it used to be and doesn't smell like exhaust inside all time. I have saginaw steering too, it's close but it will clear.

 

I haven't done a thing yet. I had an idea to run across you guys. I have 90* out at the end of the exhaust in front of the rear tires. I have a solid 2 inch diameter aluminum cyl rod that fits just inside the pipe. If I cut off a 1/2 inch slab, drill many small holes, and place in the end of the pipe with screws holding it in- it should get quieter w/o too much back pressure? right? If it is still too loud how about a second layer staggered in an inch or so? then if I want more power when I'm off road, take out screws and pull out inserts? Whaddya think?

Josh

 

This sounds like a bad idea to me, plus a waste of time. Might be a great source of frustration and aggravation though, if you're needing some of that.

 

i've been running the "triangular" flattened drivers side mani from a buick 231 v6 to clear my saginaw. no problem with any "unbalance".

with hei my oddfire runs smooth (in an oddfire way) no shaking unless i idle it at 400 rpm. i'm always amazed that the thing will still keep running and pull a load at 300 rpm...

 

I have a pass side maniold on the drivers side with the collector cut off welded up. Hole cut in the manifold just under the middle cylinder. Then welded the collector back onto the cast manifold. Its not the best answer but it works for now. It does allow me to have a dual exhaust inside the frame with dual mufflers under the body and rear exit tailpipes.

Welding cast iron manifolds sucks however. I will be building a set of custom headers for it next that dump inside the frame.

"i've been running the "triangular" flattened drivers side mani from a buick $231 v6 to clear my saginaw"

Does anyone have a pic of this manifold?

 

If you end up with an inside the frame setup with Buick manifolds, you might try a crossover pipe that connects both sides of a dual system. I hated the choppy sound of my '68 Dauntless and that really made it sound smooth and gave it a great tone, and I kept the compact glass packs. I know it's not done much in the Jeep world but it's worth doing on an odd-fire IMO. I actually got many compliments on the throaty sound I ended up with after doing a crossover pipe. A good muffler shop can do it pretty cheap and keep things from being in the way. Just an idea..

 

my dad has a similar setup on his flattie. Only he used 1 glasspack cut in half in side the exhaust. Undo a bolt, gun the jeep and out fly the HOT muffler halfs.

 

sounds like my dad's hot rod days. He had a fake choke cable that would pull up a sleeve that normally blocked an 'extra' straight pipe that bypassed the muffler. He'd pull the cable and the exhaust bypassed the muffler and straight out... very loud!

 

ahhh... the good ol' days... i remember my street "rod".R)
i like my cj quiet now. esp on the trail.

 

here's another. this was when i was mocking up the steering intermediate shaft for the saginaw converstion and before rewiring etc.

you can see how flat it is and the triangular shape. the shaft clears it fine tho' still close. you will need to move your exhaust pipe, probably.
i think it was from a 77 monza?

 

Cool pic. I am going to have to keep an eye out for one of those at the pick and pull!

It looks like it would fit my application. My steering chaft is pretty dang close now! Its worth a try though.

I might try the crossover pipe idea too....