My guess is the op may be asking about just general under hood temps.
Otherwise a cowl hood with the rear open with vents can help.
Mike, that is not a good suggestion as far as I see it. A cowl induction hood is just that, an induction hood. The vents in the back are designed to allow air into the engine compartment and can cause an air flow issue through the radiator.
Mike, that is not a good suggestion as far as I see it. A cowl induction hood is just that, an induction hood. The vents in the back are designed to allow air into the engine compartment and can cause an air flow issue through the radiator. If you look at the factory cowl hoods on the old muscle cars you'll see that they have the whole underside of the raised portion closed off except for where the factory air cleaner butts up to it to allow cool air from the cowl to enter the engine.
This is the only vented hood on the market for our cars but it cost nearly $700 before shipping and is only available for 89-93:
http://www.usbody.com/__Photo-Product-Views/A-Hood-Specs/T-Hoods/thunderbird_gt-41.htm
Old muscle cars used cowl hoods to leverage the low pressure area created near the base of the windshield. They increased this low pressure area by having the air cleaner isolated there causing fresh air to be drawn in.
In the case of our cars, This low pressure area has a high pressure area under the hood, thus the high pressure area from under the hood will be drawn to fill in the low pressure area at the windshield causing a flow of high pressure air out the top of the hood and low pressure air filling from beneath the car and/or through the radiator.
that's the theory at least. It would be easy to test with a few pieces of yarn and tape along the trailing edge of a cowl hood. See if the yarn is pulled into the cowl, or stays above it.
The area in front of the windshield is a high pressure area. I have a cowl hood and did test it. I attached ribbons at the cowl area and they very quickly went into the cowl when I drove down the road.
The area in front of the windshield is a high pressure area. I have a cowl hood and did test it. I attached ribbons at the cowl area and they very quickly went into the cowl when I drove down the road.
Mike
One problem with that then.... You have to have a low pressure zone under the hood so the air is drawn in through the radiator etc. If you change the hood so air can get drawn in from there, you are raising the air pressure under the hood behind the rad therefore the less air that is going through the rad to cool it.
Our cars rely VERY heavily on pressure differential to flow air through the rad to cool it since we don't have a big frontal area to capture air. The location of shrouds etc needs to be very carefully done to actually lower the pressure in the engine bay, not raise it. Under the car air flow dynamics also come into play as well.
I've seen SC's with nice hoods and opened ducts that get way too hot too fast because the openings are in the wrong spot.
Fraser
Fraser