KryptonKnight
forum member
My two cents = GTH 350 hood. Rad look, functional and rare. Problem, where to buy one.
The SC sitting on top of the engine also adds to the underhood temps.
Where can you purchase that from?
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This one looks functional, anyone have it? I wonder what the weight is.
http://www.cruizinconceptswholesale.com/proddetail.asp?prod=05UPHEATEXTRACTOR&cat=309
Trufiber A61 hood.
Almost zero heat extraction there. My buddy just spent weeks in the wind tunnel testing stuff like this. These type of hood had a very small level of extraction compared to the ones with vents between the back of the rad and the front of the motor.
So if anything, some of the air coming out the two "vents" will be the same air that went in at the cowl if that's being opened up into the engine compartment as well. Over and over again. How that could ever help the radiator is a mystery to me.
The low pressure area necessary to pull air out is where DoB posted . . . where the airflow is trying to separate from the hood because the hood is effectively dropping out from under it too quickly for it to follow, it creates a low pressure area (consider it a partial vacuum if that helps).
Norm
I have zero instrumentation to back the following observation. My impression of the A61 versus the stock hood is that it does a better job at controlling under hood heat than a stock hood. That is based on many popping open the hood when it was stock and after the new hood went on.
Not saying this is the best hood for heat extraction, but it is an option you can purchase that is out there and looks good also.
You are probably getting more/cooler air under the hood. A small amount compared to a "real" heat extractor hood though. I see underhood temps (actually measured) while moving about 10-15deg above ambient. Which is really, really cool.
The problem with a cowl style hod (at least one with an opening at the back) is that more air is added to an engine compartment that already has "too much air" under the hood stock. It destroys aerodynamics and isn't very effective at extracting heat (compared to how good it can be).
Stock hoods make the aero a little sketchy at 130mph. You can feel the lift.
Cowl hoods (my buddy has the Steeda) are REALLY sketchy at 130mph. There is so much lift it feels like it's a parachute.
I good extractor hood makes 130mph feel like 80mph with the other hoods.
I'm not busting on your hood. It's fine for what you're doing (I doubt you're at 100+mph very much, not many people are). And if you like how it looks and it makes you happy every time you see it that's most of what counts.
As usual I'm nit picking and attempting to inject as much real data as I can. There are a lot of "internet truths" out there that are just plain wrong. I do my best to correct that.
Would blocking off the opening at the back of the Steeda hood help? I have the street version with only a small (maybe 1 1/2" x 10") opening at the back.