Go Back   Team-BHP > Under the Hood > Modifications & Accessories


Reply
 
Thread Tools Search this Thread
Old 10th June 2005, 16:59   #1
Team-BHP Support
 
tsk1979's Avatar
 
Join Date: Feb 2005
Location: New Delhi
Posts: 22,953
Thanked: 15,641 Times
Default About bonnet scoops

I always wonder that when somebody gets a bonnet scoop for intercoolers, what happens in heavy rain. Doesn't water get sucked in? Won't it cause any problems?
tsk1979 is offline   Reply With Quote
Old 10th June 2005, 19:39   #2
Senior - BHPian
 
iceman91's Avatar
 
Join Date: Nov 2004
Location: melbourne/bangalore
Posts: 1,958
Thanked: 22 Times
Default

if water gets in......it does not matter...the intercooler is similar to the radiator..in fact the cooling will be much better!!!
water in the engine bay is bad only when we put in performance filters which are open...else you can pop the hood spray water inside and not to worry!!!
iceman91 is offline   Reply With Quote
Old 11th June 2005, 18:18   #3
BHPian
 
Join Date: Feb 2005
Location: Stuttgart, Germany.
Posts: 815
Thanked: 96 Times
Exclamation

Quote:
Originally Posted by iceman91
if water gets in......it does not matter...the intercooler is similar to the radiator..in fact the cooling will be much better!!!
water in the engine bay is bad only when we put in performance filters which are open...else you can pop the hood spray water inside and not to worry!!!
So what you're sayin is if i had a free flow intake just under a hood scoop im in for big trouble in the monsoons.....not that i have one but it was in the book.
Edmund is offline   Reply With Quote
Old 11th June 2005, 23:29   #4
Senior - BHPian
 
Psycho's Avatar
 
Join Date: Jul 2004
Location: Bangalore
Posts: 1,042
Thanked: 95 Times
Default

Well here is my two bits... Bonnet scoops are primarily for increasing airflow to the air intake components in the car however it can also be used to cool other parts under the bonnet.

Rear facing scoops are designed for letting the air pressure out from under the bonnet.

As for the rains yes water getting into the intakes of naturally aspirated cars can induce knocking however small amounts of water into a turbo actually enhances performace of the vehicle because of the retarted timings(You can read more on this by searching on water alcohol injection for turbo vehicles).

As for the intercooler it is a completely sealed unit as it requires to maintain the turbo's pressure water will only enhance performace by reducing the charge temparature and will not affect the engine in any way.
Psycho is offline   Reply With Quote
Old 8th July 2008, 12:42   #5
Senior - BHPian
 
greenhorn's Avatar
 
Join Date: Apr 2007
Location: TN-14
Posts: 6,837
Thanked: 1,314 Times
Default Practical Hood Scoops

After Seeing so many Fake Hood scoops on cars, I've been wondering , with so many intercooled turbodiesels out on indian roads(including my lowly indica) , will adding a Hood scoop really help? I've seen them on scorpios, but do they actually work?

More than that , are they practical, I mean, during heavy monsoons , wont there be water entering .
Also, are there any less obvious ways to deliver cool air to the intercooler ?
greenhorn is online now   Reply With Quote
Old 8th July 2008, 12:51   #6
Team-BHP Support
 
Akshay1234's Avatar
 
Join Date: Dec 2006
Location: Mumbai
Posts: 9,759
Thanked: 6,665 Times
Default

Quote:
Originally Posted by greenhorn View Post
After Seeing so many Fake Hood scoops on cars, I've been wondering , with so many intercooled turbodiesels out on indian roads(including my lowly indica) , will adding a Hood scoop really help? I've seen them on scorpios, but do they actually work?

More than that , are they practical, I mean, during heavy monsoons , wont there be water entering .
Also, are there any less obvious ways to deliver cool air to the intercooler ?
it depends where the intercooler is. on the scorpio mhawk the intercooler is right under the hood scoop so it works well. on cars like your indica if the intercooler is on the front on the engine then a hood scoop wont help. also water entering isnt a problem for the intercooler. its a problem for the air filter.
Akshay1234 is offline   Reply With Quote
Old 8th July 2008, 12:55   #7
Senior - BHPian
 
greenhorn's Avatar
 
Join Date: Apr 2007
Location: TN-14
Posts: 6,837
Thanked: 1,314 Times
Default

no, the intercooler is placed behind the engine

the intercooler in a Dicor
http://www.team-bhp.com/forum/iipcache/51153.jpg
the placement is similar in the turbo
greenhorn is online now   Reply With Quote
Old 8th July 2008, 14:48   #8
Senior - BHPian
 
Rahulkool's Avatar
 
Join Date: Oct 2007
Location: Chennai
Posts: 1,265
Thanked: 568 Times
Default

^^ in indica actally there is tube kind of arrangement to suck air from front to the intercooler at the back chk the arrangement below the bonnet ......
Rahulkool is offline   Reply With Quote
Old 8th July 2008, 18:06   #9
BHPian
 
abhik's Avatar
 
Join Date: Aug 2007
Location: New Delhi
Posts: 848
Thanked: 8 Times
Default

A forward facing hood scoop(usually external) is very good at cooling the engine bay as air can be directed to any part of the bay which might either require cooling like intercoolers or air-flow like air-filters.
For example i have seen an Ikon with a very small hood-scoop at the left corner of the hood above the head-light so that the high-flow filter gets cool-air directly. He protected the scoop opening with a mesh to prevent debris from entering and a sliding cover inside the hood so that if it rains he could close the scoop.
But an external hood scoop, will also produce aerodynamic drag as it is a hindrance to the air-flow.

Downward or Rear facing Inverted scoops help heat to exit the bay due to the low pressure created(effectively a small vaccum due to the air turbulence at the top-end of the scoop) and the heat vents out travelling from the windshield and back.
But due to the gaping hole(depending upon the design), water will enter from there and enter the engine bay. Usually these inverted scoops are placed near the center of the hood due to its asthetic appeal aswell, but the water entering from there might also find its way into the distributor, electricals and spark plugs which might hinder the engine functioning as well. So the inverted ones do have fuctionality but limited due to the above factor.
Forward facing inverted scoop(Well! I hav'nt seen one personally) would not be a good idea in the first place because it will generate a hell lot of drag air from the front will directly enter the engine bay and thus the -ve push.

Just my 2cents.!!

Last edited by abhik : 8th July 2008 at 18:07.
abhik is offline   Reply With Quote
Old 9th July 2008, 07:35   #10
Senior - BHPian
 
greenhorn's Avatar
 
Join Date: Apr 2007
Location: TN-14
Posts: 6,837
Thanked: 1,314 Times
Default

Quote:
Originally Posted by Rahulkool View Post
^^ in indica actally there is tube kind of arrangement to suck air from front to the intercooler at the back chk the arrangement below the bonnet ......
yea, i know there is, but I'm not sure if there is any airflow within the engine bay at all. and whether the air will be cold.

how do the scoops in the scorpio/landcruiser protect the engine in the rains ? I'm sure SUV's will encounter a lot more rain than your average sportscar.
greenhorn is online now   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Team-BHP scoops 2014 Tata Indica Vista Facelift JayPrashanth The Indian Car Scene 99 10th January 2014 13:48
Team-BHP scoops Tata Indica eV2 Facelift JayPrashanth The Indian Car Scene 21 20th June 2013 14:37
Is publishing car scoops illegal? grules The Indian Car Scene 20 3rd May 2010 13:54
the scoops in da house scoop Introduce yourself 4 5th April 2006 23:00


All times are GMT +5.5. The time now is 11:57.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks