Hi Jaunito,
The theory behind the cold air box is as the name implies. It is designed to
provide the carburetor intakes with the coolest air possible to ensure that
the induction charge is as dense as possible. The denser the charge = more
oxygen = more fuel = more power.
Although the intake is down at the grille our tests with a pressure gauge
indicate that there is, as expected, negligible ram effect but, we did find
that there is about 4" H2O pressure difference between the inside of the
cold air box and the area around the carburetors at around 100 MPH; so that
would help a little. We concluded that the engine compartment was being
evacuated a little, probably as a result of the louvered bonnet.
If you want to play with this there is a neat little gauge available for the
job.
http://www.hvactool.com/catalog.php3?haction=search&fsearch=EM150&hproductid
=EM150
Michael Salter
www.precisionsportscar.com
-----Original Message-----
From: owner-healeys@Autox.Team.Net [mailto:owner-healeys@Autox.Team.Net] On
Behalf Of Jonathan and Carole Quandt
Sent: Saturday, January 15, 2005 1:25 PM
To: healeys@Autox.Team.Net
Subject: cold air box
What is the purpose of fitting a cold air box on a Healey 100 ? Does
the box reduce the effect of overheated petrol for which these cars are
notorious. provide a minimum of supercharging, or render some other
benefit that would make the cost and hassle of installation worthwhile
?
Thanx,
Jaunito
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