How did the old 'ramcharged' Dodges and Chryslers get away with it?
Bob
On 1/19/2012 3:56 AM, Chris Dimmock wrote:
> Hi Alan,
> No, you cant pressurise a cold air box.
> Never set up your cold air box so it rams air in at higher than
> atmospheric pressure straight into your carbs
> If you do, the end result will be too much air, not enough fuel, a
> lean mixture and a destroyed/ melted piston or 4. Probably at high rpm.
> A cold air box is just that. A cold air box - the ability for cold
> air to be sucked into a carb on a hot engine. A cold air box generally
> is not sealed. It is open at one end (or somewhere) so it can't
> pressurize and force air into the carbs at higher than atmosperic
> pressure.
> Think about an old supercharger for a minute. The carb - often an SU
> on the sort of superchargers found on BMC cars - is on the outside, it
> mixes the fuel and air which is then compressed and fed to the engine.
> I.e it is a fuel air mix which is compressed, not compressed air alone.
> I've seen the results from some homemade "cold air sealed ram boxes" -
> and trust me, unless your dad owns a piston company, you don't want to
> go there.
> So the end issue is the 'flow' into the cold air box is pretty
> irrelevent, it's just a way to get cooler than underbonnet air in
> front of the carbs.
> Whether the volumetric area of a 100m cold air box is enough - no idea.
> But pressurize or seal a cold air box on SUs at your own peril....
>
> Best
> Chris
>
> Sent from my iPhone
>
>
>
>
--
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Bob Spidell San Jose, CA bspidell at comcast.net
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