Quote:
blownb310 wrote:
I am running somewhat of a temp controlled air cleaner right now. I've sealed off all openings to the stock air cleaner except for the heat riser tube and main snorkel. Both are plumbed to the back of the radiator, to draw warm air only.
If you are drawing air from behind the radiator then you are drawing luke warm air at best.
The cooling system will circulate the coolant within the engine itself untill it reaches the correct pre-determined temp when the thermostat opens a little & allows SOME of the coolant to flow into the radiator.
This is replaced by cool, or even cold water [coolant] from the bottom of the radiator flowing into the engine & eventually a balance is reached where the flow of hot coolant out & cold coolant in maintains a CHT [cylinder head temp] that is within specs.
Now in economy mode you are running very low throttle opening & the resultant low fuel burn produces very little heat [compared to full throttle] & the result is a very low flow of heated coolant into the radiator. A good radiator in fully serviceable condition will shed this heat very quickly & this process will take place right across the core & in the top few inches as the coolant flows from top to bottom.
Your smallish intake duct will draw air from a very small surface area of the radiator core & the net result will be air that is heated to a very low degree.
The best place to draw heated air from is the exhaust manifold. Later models had bosses cast into the exhaust manifold & these were usually drilled & threaded. A pressed sheet metal cover was bolted to these holes & a fitting for the air dict was built in.
Intake air was drawn into & under the edges of this cover & it had to pass over the hot manifold [which heats up much faster than the radiator does] & is drawn directly into the air cleaner & carb at a higher temp than you will ever see in air drawn from behind the radiator.
Clearly you are even now converting most, if not all, of the liquid fuel that is drawn from the carb into combustible gas which means that you are making power from every dropletof blowing some of it out of the tail pipe as unburned hydrocarbons like many stock vehicles do.
Those factory engineers were clever little fellers so using their hot air intake components will be another smart move in your quest for greater mileage.
For Aussie readers, that 77 miles per US gallon equates to about
93 miles per Imperial gallon or
20.33 miles per litre or
33 Kilometers per Litre or
3 Litres per 100 Kilometers [100 Kilometers is close enoughj to 62-1/2 Miles]
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