Yea, but wouldn't more air through the carb mean more vacuum in the dashpot
resulting in raising the needle higher?
At least that's what YouTube says. (;-)
Greg
65BJ8
"You brought me here to fix this thing and people are key." Steve Jobs
Sent from my iPhone.
On Jan 20, 2012, at 2:32 AM, Chris Dimmock <austin.healey at gmail.com> wrote:
> They didn't run SU's with a single fixed needle to meter fuel....
>
> Sent from my iPhone
>
> On 20/01/2012, at 2:39 PM, Bob Spidell <bspidell at comcast.net> wrote:
>
>> 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
>>>
>>>
>>>
>>>
>>
>>
>> --
>> *******************************************************************
>> Bob Spidell San Jose, CA bspidell at comcast.net
>>
>> *******************************************************************
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