Hood Louver Wind tunnel simulation
08-01-2010, 03:04 PM
#31
Nordschleife Master
08-02-2010, 01:14 AM
#35
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08-02-2010, 01:16 AM
#36
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Up till just recently my 951 has been a DD and has seen all weather conditions, never had any rain problems.
Nothing to cause any problems under the louvers (over the strut top area), I did keep and eye on the diagnostic port for any issues always dry.
Other hood vent location may be of concern ?
Nothing to cause any problems under the louvers (over the strut top area), I did keep and eye on the diagnostic port for any issues always dry.
Other hood vent location may be of concern ?
08-02-2010, 09:14 AM
#37
Nordschleife Master
"Well I was gonna go to the store and do this and that, but it's raining so I have to drive directly home, avoiding all traffic and traffic lights or else cold rain water will drip on my engine"
Some hood vents would be nice to extract the heat, but only with a drip pan for a DD. I would think a louver would still extract heat while moving or with cooling fans blowing even with a drip pan 1" below, with a drain tube to the ground.
08-02-2010, 09:48 AM
#39
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Not sure why you guys are worried about rain getting in the engine – do you have any idea how much water is coming up form below and through the radiator? A little dripping down through the hood is not an issue!
08-02-2010, 06:53 PM
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08-03-2010, 10:39 AM
#41
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In the low-pressure areas of the hood, a NACA duct would work well, too.
It also depends upon whether you want air in or out how and where you do the openings.
It also depends upon whether you want air in or out how and where you do the openings.
08-03-2010, 10:48 AM
#42
Nordschleife Master
03-03-2020, 11:23 AM
#43
No doubt that David's hood louvers are effective, however I am wondering what the overall best solution to modifying our hoods for improving heat extraction, and more specifically, improving heat exchanger efficiency is.
That said, I can't figure out if they are more effective than say, fellow Rennlister Duke's hood venting approach. Hopefully he wont mind me tossing up yet another pic he posted in another thread for reference.
My understanding is that our overall goal in modifying the hood of our cars is to improve the efficiency of the heat exchangers (IC/Radiator/AC on street cars) My 951 is a weekend/nice weather street car, but I am still very tempted to modify my hood because I am a firm believer that excessive heat is the root of most all mechanical failures to our engines. I don't want to risk frying the distributor or alternator if I were to be caught in a freak downpour with Duke's hood. I suppose I could have some "contingency cardboard" to slap on the hood and cover the vents if that were to happen.
Thanks for the good data David! I think your louvers are in a great spot according to that diagram.
Maybe the best solution is a combination of David and Duke's hoods...? Would probably end up being excessive for a street car. I gather that if I found a hot rod shop with sized stamps to do louvers like David's that it would be easier on the wallet, which is always a good thing.
That said, I can't figure out if they are more effective than say, fellow Rennlister Duke's hood venting approach. Hopefully he wont mind me tossing up yet another pic he posted in another thread for reference.
My understanding is that our overall goal in modifying the hood of our cars is to improve the efficiency of the heat exchangers (IC/Radiator/AC on street cars) My 951 is a weekend/nice weather street car, but I am still very tempted to modify my hood because I am a firm believer that excessive heat is the root of most all mechanical failures to our engines. I don't want to risk frying the distributor or alternator if I were to be caught in a freak downpour with Duke's hood. I suppose I could have some "contingency cardboard" to slap on the hood and cover the vents if that were to happen.
Thanks for the good data David! I think your louvers are in a great spot according to that diagram.
Maybe the best solution is a combination of David and Duke's hoods...? Would probably end up being excessive for a street car. I gather that if I found a hot rod shop with sized stamps to do louvers like David's that it would be easier on the wallet, which is always a good thing.
