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wrapping header with coils?

Old 04-14-2006, 12:00 AM
  #1  
yeaitsme
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Default wrapping header with coils?

what purpose does this serve?
Old 04-14-2006, 12:42 AM
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Gorgok
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Default RE: wrapping header with coils?

Coils of what? Brass tubing, with water flowing in them? If so its for cooling.

As far as i remember about general laws of physics and engine efficiency; you want the intake air temperature as low as possible (which is why intercoolers especially with superchargers, since superchargers heat the air); you want the combustion as hot as possible (high octane fuels, high nitro, alcohol); you want the exhaust temperature as low as possible (short pipes, straight pipes, large pipes).

Cold exhaust clears the cylinder of hot exhaust gasses better.

This is nice in theory, and is practical up to some point, but running a freezer for your exhaust probably uses up more enegry than it creates.
Old 04-14-2006, 01:38 AM
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Thompy
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Default RE: wrapping header with coils?

You want the intake air cold, because cold air is more dense which in turn gives you a better burn in the cyliner. You hit the nail on the head as far as superchargers but turbos as well use them. Turbos use the exhaust flow to turn a turbine to create boost, so you need a intercooler in there to cool the air before it is forced into the intake manifold, not only because it is close to exhaust gasses but because compressed air tends to heat up due to the compression. Also using a better air filter position in a car and a "cold air" intake will also enhance this property even if the engine is naturally aspirated. In a boat however, trying to keep things cool is done by water, AND if possible opening up your cowl or hatch if you have an inboard to create cooler air entering your carb.
Old 04-14-2006, 09:58 AM
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yeaitsme
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Default RE: wrapping header with coils?

ok so basically it is to cool things down in the hull?
Old 04-14-2006, 02:13 PM
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Ron Olson
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Default RE: wrapping header with coils?

You want a hot exhaust as tuned pipes also work using kinetic energy. Some use water cooling around the coupler to keep from blowing them out.

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