Hi Dustin,
I have a '69 1275 fitted with a lcb header and a Monza muffler. There is no
crackling and backfiring between shifts. The off throttle sound is deeper
than on throttle but no snap, crackle, pop.
When I got the car the off throttle sound had a lot of popping to it,
similar to a backfire sound but less pronounced. That turn out to be from a
burnt exhaust valve. Fixed that and the exhaust sounds great.
Switching to the lcb header gave me the best performance improvement for my
money yet. Personally, I'd stay away from going back to the stock setup if
I were you, and move in the direction of an engine that breathes more
optimally. The Monza alone deosn't help much but coupled with the lcb
you'll be pleasantly suprised.
For the popping noise check out your mixture and the condition of the valves.
Good luck,
Robert Weeks
Durham NC
1969 Midget
1968-70 Abitza
http://www.woozy.com/midget/
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At 10:55 AM -0400 5/22/98, Dustin Howarth wrote:
>hi all -
>
>When I bought my (73) midget, it came with an aftermarket muffler
>installed. I can't read a name on it, but it has a decal with a Monza-like
>stallion on it, and sounds as if it is some sort of free-flow muffler.
>Rather than the stock set-up (for '73) which has one unit oriented
>lenthwise, then a second unit mounted transversely, with the tailpipe
>exiting from the passenger side, my exhaust consists of the long, straight
>pipe from the manifold, then just the one muffler, which exits on the
>driver's side.
>
>My question is this: I am getting some rumbling when I back off the
>throttle at speed (which I kinda like), but also a lot of crackling and
>backfiring between shifts (which i don't like so much). Is this normal for
>a free-flow type muffler? Is my car just poorly tuned (timing, etc.)? Or
>did the switch from a two-unit to a single unit exhaust cause too much of
>? something, resulting in the noisy, bordering on embarassing, exhaust.
>
>I'm considering replacing what I have with a stock set-up, in order to tone
>it down a little. Should I buy from Moss? From Meineke or Midas, etc? Or
>does anyone have a muffler & tailpipe section from a (70-74?) in good shapr
>that they want to sell cheap?
>
>Anything else I should consider? Can I assume that my straight pipe is
>more or less universal, and will accept the stock muffler section? Or
>could it be from a different year car, and in some way different?
>
>The weather in southwestern PA has been beautiful the past few days (mid
>70s to 80s). There's just nothing like tooling around with the top down on
>a sunny day!
>
>Dustin Howarth
>'73 Midget 'Margo' GAN5UD128862 G
>howarth@pulsenet.com
>Pittsburgh, PA
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