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Small puff of smoke on start up/crank over. idle issues too
https://www.ausmini.com/forums/viewtopic.php?f=2&t=76188		 Page 1 of 1
Author:  Blunder [ Sat Mar 31, 2012 6:54 pm ]
Post subject:  Small puff of smoke on start up/crank over. idle issues too
hi guys

My SPI mini seems to give a small puff of smoke on start up/ crank over, this is then followed by a fair bit of moisture spitting.. Now i can assure the car doesn't use ANY water..

So... is it the exhaust design? After it has been run there is no issues with exhaust moisture at all... I think the swept design is caputuring moisture?!?! It has done this since i got it on the road recently.... Here is a picture:

Image

Also when it has sat after a run allowing the heat to soak in the idle seems to sit at 1500rpm, as a guess and i hope someone will confirm, it probably needs alot of the inlet and exhaust gaskets replace as the is probably a leak that shows up on heat expansion?

Thanks
Author:  Blunder [ Sun Apr 01, 2012 10:50 pm ]
Post subject: 
Anyone else run this exhaust?
Author:  Harley [ Sun Apr 01, 2012 11:29 pm ]
Post subject: 
Take the car for a good run of an hour or so to get the condensation out of the exhaust. Run with 98 fuel too. If you have access to a code reader computer do so and check everything for operation. My car did the same with the stock exhaust until it got a couple of decent high temp runs.
Author:  Mokesta [ Sun Apr 01, 2012 11:49 pm ]
Post subject: 
I was always pretty crap at chemistry but it goes something like this:

Hydrocarbon plus oxygen equals heat plus water plus carbon dioxide

The heat gives the engine it's power and the water and co2 come out the exhaust. There is always water comin out the exhaust but it's normally steam. On start up the cold exhaust cools the steam until it condenses. A large bore exhaust will stay cooler longer, making more water. Stainless will perform different to steel and cat converters make the exhaust take longer still. Running too rich on cold start makes more water and soot.

So the upwards tips are not necessarily keeping in condensation unless you do short trips and never get the exhaust fully hot.


M
Author:  drmini in aust [ Mon Apr 02, 2012 8:48 am ]
Post subject: 
Every litre of fuel burned produces about 1.25L of water as water vapour.
As mokesta said it's usually steam and you can't see it.
When you shut it down overnight much of it condenses to water and lays inside the muffler- to be blown out in the morning when you start it cold.
It is not pure water, it is a bit acidic from the byproducts of combustion.
Some cars eg the Chrysler Valiant had a 3mm hole drilled in the muffler at the lowest point, to let it drain away. Reducing corrosion, supposedly.
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