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Hood blisters

heimo huima

Well-known member
Joined
Dec 5, 2004
Messages
56
Location
Finland
Corvette
1990 #33 twin turbo
I`m looking for ways to get better cooling to the intercoolers and
hood blisters could be the best way. Are ACI millenium hood scoops
good or bad copy of the orginal blisters?
 
Joined
Mar 18, 2002
Messages
934
Location
Westchester,New York
Corvette
1989 Callaway Twin Turbo Aerobody Coupe
I would use the Callaway products and keep the car all Callaway.You can get the original hood blisters from Callaway. It depends on what year car you have as they have two different applications. one for 1991 and one for the other years . It depends if you have the underhood ductwork or not . I have a complete set waiting to go on soon.
 

kruzmisl

Well-known member
Joined
Aug 26, 2003
Messages
389
Location
Leawood KS
Corvette
1989 B2K Callaway/ 1966 Corvette Coupe
Those sure would look nice on your #16 hood!!!!!!!:L (private story) So if you have the original underhood ducts, how does it work? Do you need new ducting as well?
 

heimo huima

Well-known member
Joined
Dec 5, 2004
Messages
56
Location
Finland
Corvette
1990 #33 twin turbo
I have `90 so got underhood ducting. How much would the kit from Callaway would be, if you don`t mind me for asking?
 

*89x2*

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Joined
Feb 18, 2002
Messages
10,357
Location
CallawayOwnersGroup.com
...So if you have the original underhood ducts, how does it work? Do you need new ducting as well?


Paul, there are two diverter baffles that go underneath the new blisters from Callaway. Also added, is a blockoff plate that goes over the oval port in front of the radiator where the air would normally be rammed in from (to the original ducting).

The original ducting stays bonded to the underside of the hood :cool
 

heimo huima

Well-known member
Joined
Dec 5, 2004
Messages
56
Location
Finland
Corvette
1990 #33 twin turbo
Why the orginal ducting is blocked off ? Would there be any airflow
conflicts between front feeding and top feeding scoops to the intercoolers, because I would think that you would get bigger airflow using both as a combined method?
 

Aurora40

Well-known member
Joined
Jul 12, 2004
Messages
1,147
Location
The Old Dominion
Corvette
1990 red on red ZR-1
Here's a picture of 1990 #23 that had Callaway upgrade the hood:

hood.jpg


I think the blisters look bad@zz from the driver's seat over the hood.
 

heimo huima

Well-known member
Joined
Dec 5, 2004
Messages
56
Location
Finland
Corvette
1990 #33 twin turbo
So has anybody got info why the orginal ducting is blocked off and why not
use both for better airflow?
 

*89x2*

Well-known member
Joined
Feb 18, 2002
Messages
10,357
Location
CallawayOwnersGroup.com
So has anybody got info why the orginal ducting is blocked off and why not
use both for better airflow?


While I have not performed any tests to prove this one way or the other, my gut feeling is that there is a conflict with the airstreams at the pint where they meet.

It is my understanding that the hood blisters are so much more efficient over the underhood design which were even more efficient than NACA's, that intercooler temp's drop radically!

Check with mvendetto@callawaycars.com for current pricing (and maybe some technical info as well) - I hope this helps :beer
 

Aurora40

Well-known member
Joined
Jul 12, 2004
Messages
1,147
Location
The Old Dominion
Corvette
1990 red on red ZR-1
It is my understanding that the hood blisters are so much more efficient over the underhood design which were even more efficient than NACA's, that intercooler temp's drop radically!
I believe the paperwork that came with the car indicated Callaway claimed 190% better flow through the intercoolers. I don't recall the exact wording to know if it's a 90% improvement (190% as much air) or a 190% improvement (290% as much air).
 

heimo huima

Well-known member
Joined
Dec 5, 2004
Messages
56
Location
Finland
Corvette
1990 #33 twin turbo
Ok, thanks for help..Just emailed about hood blisters, so hopefully soon I know more.:)
 

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