hood venting experiment and results
by bigbirdSCed » Sun Jun 29, 2008 6:57 pm
hey guys. just thought id post up my little expereiment and results that i have been performing for the past month. ive tried to keep it as scientific as possible and think it went well. figured it may be an interesting discussion about hood venting. so here goes:
the expereiment:
after taking some time to really look at it i noticed the S/C sits in possibly the worst part of the engine bay that it could. at the back and highest point near the fire wall as yall know. knowing that heat rises and that there is little air movement in that part of the engine bay i figured that alot of heat is prolly gathering around the intake and supercharger. so i decided to see what the tempratures are like in that location of the engine bay both vented as stock.
first thing i did was buy a remote thermometer. next i ran the temp probe into the engine bay and mounted it over the supercharger using the strut bar. making sure to keep it far enough away from both so the data would be compromised by the heat soaked into the metals. i then picked 2 different local roads to do some testing. one was stop and go and the other was highway. in both tests i boosted several times to get the temp up.
for the first test i drove the hood as it is stock, not vented both on the stop and go and highway and made several passes making sure to note the outside temp. the second test i pulled down about a 1' strip of the rubber weather stripping that seals the hood and firewall when the hood closes. it was enough to allow about a 12"x1" gap between the cowl and hood, not a whole lot. the results are as fallows but i averaged it to keep from having to go through the numbers on here.
sealed 93 degrees O/S temp:
city(stop and go) - avg 154 degrees
note: the thermometer wouldnt go higher then 160 and 25% of the data was beyond the threshold of the gauge.
highway (average speed 70 mph) - 145 (pretty consistant)
vented 87 degrees O/S temp:
city - 146
highway (average speed 70 mph) - 107 (fairly consistant)
the biggest differance between sealed and vented was on the highway. i saw an average of 30 degree cooler temps at the location of the supercharge and whats more at 94 degrees O/S on an earlier test the temp was still only at around 110. temp around the city was about a 10 degree diffeance, not much but once moving the engine bay cooled off much quicker and the numbers were less consistant when vented.
im not sure what all this would really mean in reguards to our superchargers running cooler, longer or more efficently. ive only been around these for a year so im no expert, but i know heat is the enemy here and if the temp can be consistantly 30 degrees cooler then i can imagine it would only help if that could be maintained.
the expereiment:
after taking some time to really look at it i noticed the S/C sits in possibly the worst part of the engine bay that it could. at the back and highest point near the fire wall as yall know. knowing that heat rises and that there is little air movement in that part of the engine bay i figured that alot of heat is prolly gathering around the intake and supercharger. so i decided to see what the tempratures are like in that location of the engine bay both vented as stock.
first thing i did was buy a remote thermometer. next i ran the temp probe into the engine bay and mounted it over the supercharger using the strut bar. making sure to keep it far enough away from both so the data would be compromised by the heat soaked into the metals. i then picked 2 different local roads to do some testing. one was stop and go and the other was highway. in both tests i boosted several times to get the temp up.
for the first test i drove the hood as it is stock, not vented both on the stop and go and highway and made several passes making sure to note the outside temp. the second test i pulled down about a 1' strip of the rubber weather stripping that seals the hood and firewall when the hood closes. it was enough to allow about a 12"x1" gap between the cowl and hood, not a whole lot. the results are as fallows but i averaged it to keep from having to go through the numbers on here.
sealed 93 degrees O/S temp:
city(stop and go) - avg 154 degrees
note: the thermometer wouldnt go higher then 160 and 25% of the data was beyond the threshold of the gauge.
highway (average speed 70 mph) - 145 (pretty consistant)
vented 87 degrees O/S temp:
city - 146
highway (average speed 70 mph) - 107 (fairly consistant)
the biggest differance between sealed and vented was on the highway. i saw an average of 30 degree cooler temps at the location of the supercharge and whats more at 94 degrees O/S on an earlier test the temp was still only at around 110. temp around the city was about a 10 degree diffeance, not much but once moving the engine bay cooled off much quicker and the numbers were less consistant when vented.
im not sure what all this would really mean in reguards to our superchargers running cooler, longer or more efficently. ive only been around these for a year so im no expert, but i know heat is the enemy here and if the temp can be consistantly 30 degrees cooler then i can imagine it would only help if that could be maintained.
- bigbirdSCed
- SolaraGuy Driver
- Posts: 343
- Joined: Wed Sep 12, 2007 9:03 am
) I remember reading something somewhere......another forum possibly, about using washers where the hood bolts to the hinges to raise it a bit with somewhat similar results
