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In the Old Mopar How to build a cars Book it talks about the use of front Spoilers for reducing air flow under car but thats about all they say, Is a front spoiler effective on old race cars, Camaro, Barracuda,
 

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just completed front spoiler install on my 68 camaro and along with blocking the front grill,
picked up 1.5mph & .05+ in the 1/4
 

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In the Old Mopar How to build a cars Book it talks about the use of front Spoilers for reducing air flow under car but thats about all they say, Is a front spoiler effective on old race cars, Camaro, Barracuda,

Yes, Definately!
My background is vintage road racing. I raced a 70 Corvette. When I wiped out the front spoiler a few times, my lap times suffered a lot.
Front end lift was terrible at high speed, the whole car felt like a dinghy in choppy water
The straight line stability was terrible and top speed was only 150mph, but with the spoiler I could get up to 176mph easily [ probably due to corner exit speeds as well ]
 

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Discussion Starter #6
Yes, Definately!
My background is vintage road racing. I raced a 70 Corvette. When I wiped out the front spoiler a few times, my lap times suffered a lot.
Front end lift was terrible at high speed, the whole car felt like a dinghy in choppy water
The straight line stability was terrible and top speed was only 150mph, but with the spoiler I could get up to 176mph easily [ probably due to corner exit speeds as well ]
Wow thats something What type and how is it set up?
 

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In the Old Mopar How to build a cars Book it talks about the use of front Spoilers for reducing air flow under car but thats about all they say, Is a front spoiler effective on old race cars, Camaro, Barracuda,
The NHRA sure seems to thinks so. If you are going to claim your 67-69 Camaro should have a front spoiler on it for Stock Eliminator, you are required to run the rear (trunk lid) one too. Can't run the chin spoiler without the trunk spoiler. I think it's pretty common knowledge that the stock rear one is only gonna slow you down, if anything at all. Take care. Tom Worthington.
 

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Wow thats something What type and how is it set up?

The rules required stock[ish] spoilers, mine was 78 pace-car front stretched down about 1" with a 1" horizontal lip [ splitter ]
The grill was partially blocked with an internal air dam which bled off air pressure thru slots in the L88 hood scoop. The radiator was fed air from the base of the front spoiler.

All the side grills were removed to bleed off under hood pressure and temperature [ the BBC ran at a constant 180f ]

The rear was also a 78 pace car replica [ extented 1" ]
The Corvette rear is like a parachute underneath , so I bored holes behind the bumpers and under the rear spoiler and cut slots on the rear of the spoiler to bleed air off.

With aerodynamics, the biggest resistance is drag and turbulence behind the vehicle [ not frontal ], so air getting underneath also causes major drag.[ look at a teardrop for example ]
So putting a huge front spoiler on reduces underneath drag even though the frontal area is increase [ huge splitters are more effective ]
Cutting the rear roll pan out and putting a diffuser in the rear is very effective [ but ugly ]

With vintage road racing, I was playing with 1970's era cars and 21 century knowledge, this always caused a few problems with rulemakers
Aerodynamics gave me huge gains [ cheaply ] in road racing.
firstly the cornerng speeds were higher, so the braking distances were shorter. The exit speeds were higher, so the terminal speeds were better.

how do I post pics here? or do I have to pay my dues with the bullet police?
 

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what did you block the grilles with? any pics?
Got some black plexiglass from a sign maker. 1/4" thick
cut 2 pieces, 1 for each side
Made 2 brackets using 1 1/2" x 48" strips of metal (home depot)
bent the steel to fit across the grill area and bent tabs to bolt to the rad. support. and support in middle
I think it came out great.
my car went from 10.50's @ 127+ to 10.44best @ 129 last Wed. night

Could't make small pics , so made a link

http://i640.photobucket.com/albums/uu124/gg68camaro/grillblockoff003-1.jpg
http://i640.photobucket.com/albums/uu124/gg68camaro/grillblockoff002-1.jpg
http://i640.photobucket.com/albums/uu124/gg68camaro/grillblockoff001-1.jpg
http://i640.photobucket.com/albums/uu124/gg68camaro/grillblockoff004-1.jpg
 

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just completed front spoiler install on my 68 camaro and along with blocking the front grill,
picked up 1.5mph & .05+ in the 1/4
I had roughly the same results on old yeller, plus the car felt more stable on top. not a bad improvement for 50 bucs.:cool:
 

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I never could get a front spoiler on my 57 to look right, its cant hurt pushing the air up over the car rather than under it.
I used 1/8 lexan behind the grill in my 57 and stainless buttonhead 6/32 bolts with nylon nuts.
It wanted to wheelie REAL bad about 800', solved it 100%. Then we started adding power, ;).
 

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Discussion Starter #12
Got some black plexiglass from a sign maker. 1/4" thick
cut 2 pieces, 1 for each side
Made 2 brackets using 1 1/2" x 48" strips of metal (home depot)
bent the steel to fit across the grill area and bent tabs to bolt to the rad. support. and support in middle
I think it came out great.
my car went from 10.50's @ 127+ to 10.44best @ 129 last Wed. night

Could't make small pics , so made a link

http://i640.photobucket.com/albums/uu124/gg68camaro/grillblockoff003-1.jpg
http://i640.photobucket.com/albums/uu124/gg68camaro/grillblockoff002-1.jpg
http://i640.photobucket.com/albums/uu124/gg68camaro/grillblockoff001-1.jpg
http://i640.photobucket.com/albums/uu124/gg68camaro/grillblockoff004-1.jpg
How does cover grill effect air flow to radiator,
 

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How does cover grill effect air flow to radiator,

The best way is to open-up some holes in the lower front valance [ just above/in front of the chin spoiler ]
You will pick up more air there than from the grill at high speed.

This area is usually trapped air [ and high pressure ] whereas the top of the grill & and front of the hood is low pressure. [ try popping the hood at 100mph if you dont believe me ]
 

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Wow, some good stuff here! Something else to think about... rake matters. Lowering the front of my car 2 inches and raising the rear (had to for the tires to clear) added 1mph! I never would have guessed that.
 
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