Holes in plugs

Why would you want to do that?

Why would you want to do that?

:iagree:

That site offers odd advice.... read this....

Use Warm Air Intake: Very important to modify intakes to draw warm air near radiators rather than taking cold air from under the fender. This is an important change. NEVER draw cold air into your engine if you expect good MPG.

even better.......

Been doing this for many years. I did this to my Mazda (Ranger) pickup and all our cars. We found a little more power and torque as well as a nice MPG boost.

Hot air will reduce MPG due to the intake air being less dense, thus less fuel need. But will reduce power as less oxygen is available for combustion, so not an accurate statement.

Might as well buy split fire plugs rather than trying to drill a spark plug, they do the same thing without a need for a workshop, drill press and a steady hand.

And another one saying "why"?

The thermodynamic equations for Thermal Efficiency clearly state warmer air is better for efficiency and mileage

No, they don't?

No, they don't?

I didn't think they did. Or does this guy know something no-one else does, and everyone else is going the wrong way by fitting (bigger) intercoolers?

Testing a warm air intake (WAI) - MetroMPG.com

total rubbish!

classic example is the old nissan sunny (pulsar) gtiR. when they rallied it, it couldnt be beaten in cold climates, where as on warmer rallys it just couldnt perform.

hot air = bad

cold air =

total rubbish!

classic example is the old nissan sunny (pulsar) gtiR. when they rallied it, it couldnt be beaten in cold climates, where as on warmer rallys it just couldnt perform.

hot air = bad

cold air =

Ah yes, the Nissan Sunny and its "inter-heater".

Testing a warm air intake (WAI) - MetroMPG.com

Ah, I see! It's the reverse logic of the 'resistor mod'. There might be some truth in it preventing the engine from burning extra fuel when it's very cold, but it has nothing to do with thermodynamics!

although turbocharged cars benefit from cooling there may actually be some science behind all this 'warm air' intake hype....

yes i agree that cool air is more dense and therefore carried more oxygen but, warm air is more easily combustible because it takes less energy to make it "explode"....

but to be honest i reckon in this climate you would be hard pushed to notice any difference at all on most normally aspirated cars regardless of where thier intake is or what temperature the air is

Why would you want to do that?

ear rings

yes i agree that cool air is more dense and therefore carried more oxygen but, warm air is more easily combustible because it takes less energy to make it "explode"....

Well, NA petrol engines don't want the air to 'explode', they want the fuel to burn in a slow and controlled way.

And TDi's have a turbo - so by the time the air gets to the cylinders it's been pressurised, raising the temp, then passed through an intercooler which lowers it a little....

The 'law of thermodynamic efficiency' which is so badly misquoted on that site is actually:

n = 1 - Tc/Th

where Tc is intake air temp and Th is the combustion temp. This is the theoretical maximum efficiency, so the aim is to make Tc/Th as small as possible. So the input air temp as low as possible, and the combustion temp as hot as possible. The combustion temp is basically dictated by the fuel used, so the cooler the incoming air the better.

Of course, our ECUs are programmed to monitor the intake temp and, when it's REALLY cold, increase the richness of the mixture, thus lowering mpg. This is what the 'resistor mod' does - fool the ecu into thinking it's really cold, boosting fuel input and power at the cost of mpg. The warm intake thing is to fool the ecu the other way, into thinking it's not very cold and keep the mixture lean. It might well have the desired effect when it's really cold, but over here where you can count the number of mornings below zero on your hands and feet it hardly seems worth it. When it gets warm the ECU couldn't give a damn what the intake temp is, but your engine is crying out for cold clean air!

That web site that recommends holes in the spark plug is great! It lists 12 things you can do to improve fuel economy and in each case quotes a range of economy improvements that you can expect for each. Taking just the minimum expected improvement for each, I discovered that if you do all 12 things you can expect fuel economy to rise by 159%. That means that instead of my Favorit returning about 38MPG average, I'd be getting about 98MPG.

hahaha that was the biggest load of Bull **** i've ever read!