heated intake..why?

[claybill]

does a heated dual intake(edmunds,offy,fenton, others) help? a hot water tube from radiator/heater is circulated along the side of intake. supposedly warm manifolds help with the _________.?

when start-up the radiator is cold and so is the water..no help there.

when motor is warm the manifold gets heat from closeness to exhaust.

so when and what for does this really help.?

seems easy to add this system to a dual aluminum intake that does not have one..

bill

[moose]

I've wondered about this too. I've been running several different non-heated intakes(neither by the exhaust nor the water) for the last 8 or 9 years, and I've not really had a problem with any of them.

I suppose a cast aluminum intake may have more of an issue with heat dissipation, and keep it colder, or wouldn't be warmed as much by the exhaust. I'm building one right now for a customer with a water heat chamber and maybe we'll hear if it works better for him.

[Merle Coggins]

Read Dave "greybeard" Erb's article on the DEPTCA site for more info on why you may need heat on your intake manifold.

http://dodgepilothouseclub.org/know/riser/riser.htm

Merle

[greg g]

Plus the water only circulates when you have the heater on, unless you plumb it differently.

[martybose]

My mechanic said that it does two things. It prevents fuel from condensing on a cold manifold, and it aids in vaporization of the fuel. Both seem a good thing to me.

Marty

[T120]

..and another opinion - I'm not the author ...."In upgrading their induction systems, especially with in-line six cylinder engines, people often install both a 4bbl carburetor and headers. The problem they run into with this upgrade is that the intake manifold no longer has a source of heat. Gasoline requires heat to evaporate and this evaporation can greatly cool the airstream, often enough to cause condensation on intake manifolds. Heat is necessary to help keep the fuel mixed in with the air stream. At low loads, the high vacuum manifold vacuum keeps the fuel vaporized, which results in good fuel mixture distribution among the cylinders. However, when the load is high like at wide open throttle (WOT), the low manifold vacuum cannot vaporize the fuel and much of it puddles on the manifold floor causing the fuel mixture to become lean and the engine to loose power. The car manufacturers have always equipped their carbureted engines with intake manifold heat for this very purpose. Only all-out race, propane-fuelled, and multiport fuel-injected engines can really benefit from cold intake manifolds"

[blueskies]

Plus the water only circulates when you have the heater on, unless you plumb it differently.

I have my vintage Edmunds plumbed so that the water flow is constant... with a "t" in the line to the heater. When the heater is off, all of the flow is through the intake to the water pump. When the heater is on, the coolant flows through both the intake and heater. Heater gets hot even in sub zero temps. Works great.

I'm not running chokes on my dual carb setup. When I start the car, even below zero, it fires right up. I keep the rpms up a tad-bit, and by the time I get it backed out of the garage, the intake is warm, it idles without the throttle, and it's ready to go.

Pete

[BeBop138]

I am the guy Moose is building the intake for----I asked him to post pics of it. After it`s installed I will let you know how it works. I will be setting my water flow the same as Pete`s. The engine it`s going on is about half way thru the rebuild--if things go well I should have it in before fall. If not it will become the "winter project":D Lee

[moose]

First pic is during layout and construction. Second is after the intake is complete ready for the water jacket. Third is my daughter REALLY excited about this one.

[blueskies]

...ready for the water jacket. Third is my daughter REALLY excited about this one...

I think this is your best intake yet, Moose...

Will the water jacket weld on to the side of the intake?

Looks great.

Pete

[moose]

Thanks Pete. Maybe I should have pretty girls posing with my stuff more often.

Yeah the water jacket will get trimmed a bit then welded on. The hose connections will be angled down a little, like in that first picture.

[Powerhouse]

great idea:D....I'd like to see how this works out. I was thinking of doing the same thing if I need it. I am not sure when I will be installing the manifold yet...too much going on...

[greg g]

OK I grasp the concept, however, a nice coil of brass tubing wrapped around, soldered or brazed in a couple places would look pretty neat in a retro kinda way also. You could put a couple turns around the risers also.

Cute kid, she looks like she can twist your patience now and again........