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 Exhaust leak or something more serious?

 Created by: fzxtreme
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 Posted: May 9, 2022 10:55PM
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Looks like (and is in about the right place) for the standard fuel feed line. Flex line usually connects this to the carb.

Maybe while you have it on stands you can trace where the line goes? Probably heads back towards the tank.

Cheers, Ian

 Posted: May 9, 2022 07:28PM
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Thank you Ian and Dan for your input!
I got the car on stands to see if I could spot anything from underneath and there may be some black soot near the manifold so that supports the theory of a failing gasket. I tried to feel around the manifold to see if I can feel it but couldn't. I've ordered a new gasket and will begin the replacement soon. Thanks again for your input!
On a unrelated note, I spotted a disconnected hardline from what looks like it could be a vacuum line or some sort of return line near the radiator. Would anyone know what what it's for or what it connects to?
https://imgur.com/ngeskO0
https://imgur.com/rCr2DGC

 Posted: May 8, 2022 05:18AM
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CA
+1 to Ian's diagnosis. Your exhaust manifold does look rusty. Perhaps it is beginning to fail. The gradually increasing noise suggests to me a hole that is getting bigger. The "popping" noise sounds to me like the exhaust pulses from the closest cylinder to the hole. Normally this kind of sound is attenuated within the exhaust system.

If you can't reach under/around the exhaust manifold while it is hot, try using a listening tube (hose or metal pipe) to locate the noise more closely.

.

"Hang on a minute lads....I've got a great idea."

 Posted: May 7, 2022 06:13PM
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Certainly sounds like an exhaust leak.... The video doesn’t help that much... you need to concentrate on the back of the engine...... from below would be good.

Before pulling anything apart I would be getting the car as high as possible (with the engine off :) and looking for either shiny bits (something rubbing - unlikely but possible) or black smudges where the exhaust gasses are escaping.

I would concentrate on the bottom of the manifold gasket or a bit lower down where the manifold and exhaust pipe join. To me it sounds like only a single cylinder which *might* implicate the head to manifold gasket on No 1 cylinder. You might be able to reach ...VERY!!!!! carefully under the manifold and actually feel the puffs of exhaust escaping....

Cheers, Ian

 Posted: May 7, 2022 12:09PM
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Good day all,

I recently acquired a 93 Mini 1300 with a carb and have been enjoying it on the weekends but earlier today the car may have developed an exhaust leak or maybe something more serious is brewing. To me it sounds like an exhaust leak but I wanted to ask others who are more experienced with these vehicles. 
I was on my way to cars and coffee and the car was driving normally up until it the engine started to get louder and louder. I pulled over to inspect it and found nothing obvious and decided to take the Mini home instead and investigate the noise further. It sounds like a popping noise, it sounds to be coming from the right side of the engine near the radiator (which is why I focus on that area in the video, linked below), and it doesn't seem to be coming from the underside of the engine. Driving it back home, the car didn't lose power or drive any differently once the noise developed and the noise does get louder as the engine revs higher.  When I would left off the throttle the noise would subside and the engine would quiet down to a normal level. Only when I would accelerate again or the car was stationary and idling would the noise return. This leads me to believe it has something to do with the exhaust side of things since the noise seems to occur when under idle/acceleration and not when engine braking/coasting. So my current plan is to replace the exhaust manifold gasket and further inspect the area as I take stuff off but I wanted to see if anyone may have some knowledge/experience they can bestow on me.

Here's a link to a short video of the engine noise if anyone may have any advice. I may post a driving video as well for further documentation.
https://www.youtube.com/shorts/RfkDXWHNbJc

Thanks for reading!