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Engine bay temp reduction/hood aero - I was thinking about weather some holes in the hood would help reduce engine bay temps? like the grand sport has holes in the hood and if so whats best area to put holes in? and how this might affect hood aero etc?
my 78 vette will be used for racing and runs a procharger at 16 psi of intercooled boost, just incase people think i dont need to reduce engine bay temps
Both front and rear of scoop are open, plus the venting for radiator heat.
Vortec at 9psi boost. Also wrapped the headers with that 'DEI' wrap. T
Pictures PLEASE
Last edited by terrys6t8roadster; May 5, 2018 at 06:50 AM.
Hi there, thanks guys for pics, both look good, trying work out the best route to max cooling affect
pics below of my setup, running procharger at 16 psi, plus a intercooler out front, which i think is where a alot heat is coming from and then it ends up heat soaking the radiator, still need to do a new aero scoop under intercooler
Last edited by corvettedave383; May 5, 2018 at 01:29 PM.
From: Las Vegas - Just stop perpetuating myths please.
I think for your intercooler you would want an air dam under the front bumber.
And to get more hot air out vents over the exhaust manifolds with some louvers to interfere with the airflow over the hood and direct it upward in-training the hot under hood air is what you are trying to achieve.
I think for your intercooler you would want an air dam under the front bumber.
And to get more hot air out vents over the exhaust manifolds with some louvers to interfere with the airflow over the hood and direct it upward in-training the hot under hood air is what you are trying to achieve.
yeah will doing a air dam under intercooler,
ok cool louvers sounds like a good plan, so best placment for them with be over the headers, how big? big as possible??
From: Las Vegas - Just stop perpetuating myths please.
Sorry but I don't have a formula for vent & louver size. But if you at many of the new Mustangs they have something like what I'm trying to describe. Chevy has some weird looking but function vents on the camaro and Dodge has something on the challengers too.
Something that many overlook is to get the hot air out while they focus on ramming colder air in. But hot air moves up and the hood is the best location for vent IMHO.
Sorry but I don't have a formula for vent & louver size. But if you at many of the new Mustangs they have something like what I'm trying to describe. Chevy has some weird looking but function vents on the camaro and Dodge has something on the challengers too.
Something that many overlook is to get the hot air out while they focus on ramming colder air in. But hot air moves up and the hood is the best location for vent IMHO.
Hey Dave,
I wonder if you could adapt some 1979 era Z-28 fender louvers to your hood? They sell used on eBay fairly reasonable. You could even run 4 of them. Two towards the rear of the hood and two closer to the front. Should give plenty of venting and might not look too bad either.
Dave have you checked what the air intake temperature is? Mine was 160* on a 80* day last summer. There was a drastic under hood temp change after the headers got wrapped. Yours looks pretty cool with the fuel injection. Thanks for the picts. T
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You dont want to get to close to the windshield as it creates a high pressure area and some cars used a fresh air intake close to the windshield because of that. It may not vent anything at all. I had an open L88 hood and it did nothing for cooling my engine. I had heat soak issues when ambient air hit 70*F and it was a small block
LIke Cardoo said about being over the manifolds is probably the best Idea most likely even with the front wheels.
Last edited by Rescue Rogers; May 6, 2018 at 09:04 PM.
You dont want to get to close to the windshield as it creates a low pressure area and some cars used a fresh air intake close to the windshield because of that. It may not vent anything at all. I had an open L88 hood and it did nothing for cooling my engine. I had heat soak issues when ambient air hit 70*F and it was a small block
LIke Cardoo said about being over the manifolds is probably the best Idea most likely even with the front wheels.
you might want to reword your statement high pressure near the base of the windshield I have a cowl induction twin turbo hood with vents forward that you can see heat waves coming out of at a stop light
you want vents right behind and above the radiator like the old gt40s and Panteras. The high speed air over the nose with correct body rake takes air out from under the hood
Hey Dave,
I wonder if you could adapt some 1979 era Z-28 fender louvers to your hood? They sell used on eBay fairly reasonable. You could even run 4 of them. Two towards the rear of the hood and two closer to the front. Should give plenty of venting and might not look too bad either.
Dave have you checked what the air intake temperature is? Mine was 160* on a 80* day last summer. There was a drastic under hood temp change after the headers got wrapped. Yours looks pretty cool with the fuel injection. Thanks for the picts. T
i run a fast xfi fuel injection system, so i can monitor air intake temps, my intake for procahrger is in the engine bay, so when iam crusing along, temps ok, but when i get the foot down, thats when the temp starts to build, so air intake will be around 130/140 when crusing, when you start giving it some, they will raise to 160+, when i do a log on the ecu, the car will will do 60-100mph in 2.7 secs, at 160+ runs, that time goes down to 3 secs, so losing some power, the water temp rises aswell, if you lift hood after some wot runs, its hot under there, so any extra coooling would be very useful, i do have ceramic coat headers, but maybe wraping would help some more
have thought about maybe a box around the air intake filter?? and already have hole and a temporarily air duct to get fresh cool air onto the filter, pic below,
you might want to reword your statement high pressure near the base of the windshield I have a cowl induction twin turbo hood with vents forward that you can see heat waves coming out of at a stop light
you want vents right behind and above the radiator like the old gt40s and Panteras. The high speed air over the nose with correct body rake takes air out from under the hood
Hole in hood right above procharger. Is that for clearance? Could you axtend it rearward and put the intaje air up to that hole? Cuz right now you are sucking air right off that left header.
Engine bay temp reduction/hood aero
