General a small question

[panda_owner]

I have replaced my thermostat and installed small primitive device so I can change intake air from hot to cold, depending on outside temperature. Thank you all for answering my questions. I have another one, small.

I would like to know: when the outside temperature is below 0 (zero) and the engine is cold, the intake air shold be warm. But when the engine warms up to working temperature should I switch to cold intake air or leave it on hot?

And finnaly what is best temperature of incoming air into the carb?

 

[pandaman71]

Hi

The best temperature of incoming air into the carb is aprox 20 degrees Celcius. this will let let engine give most output.

 

[John H]

A UK specification "FIRE" Panda has a filter box like this:

regardless of being carburettor, or fuel injected, give or take the logo.

Inside the front portion there is a thermostatically controlled valve arrangement which takes hot air off the exhaust when it's cold, and changes over to unheated air as things warm up.

903cc Pandas have a winter/summer setting on the airfilter cover, which you move yourself when the mood takes you - frosty mornings, or the onset of carburettor icing, would be a reasonable thing to use to change it.

AFAIK intake air is better colder for efficiency, but icing is a limiting factor with a carburettor - injection can work a bit colder as the fuel supply is pulsed, rather than continuous fine spray (which gives cooling by evaporation problems).


Regards


John H

 

[panda_owner]

what is AFAIK, John H?

 

[PandaManPaul]

903cc Pandas have a winter/summer setting on the airfilter cover, which you move yourself when the mood takes you - frosty mornings, or the onset of carburettor icing, would be a reasonable thing to use to change it.

Not the later 903s John

But you're quite right, pre-1992 models did, as did the 843cc in the Marbella.

Panda_Owner, it means As Far As I Know

 

[Enzo]

More or less it's the same system present on the Renault 5 1.1...a corrugated pipe attached to the filter box which you can connect on the exhaust manifold or behind the rad grille depending on the temperature .

 

[panda_owner]

But isn't the cold air better because of higher density of O2 in cubic cm?

 

[Enzo]

In theory...yes, in practice is not so easy, because the carburettors can't adjust the mixture according to the air inlet conditions...the simple SPI system can do this because it has the ATS sensor. The results of a too cold intake on a carbed car may be the icing and a weak mixture which could produce poor performance,overheating,detonation :slayer: