whatcop?

I think he means the "wall" behind the NACA duct. There are two different things going on in this thread.

1) People asking about removing the NACA bezel which is the front outer piece/ornamental piece

2) People referring to actually opening the duct up so the air-filter can breathe.

HNK

Jim

Any real life data between standard NACA duct and opened up one? And if using your beehive, there wouldnt be any need for the vented hood?

HNK

I guess no real life data

Halltech

No data. I can tell you that our IAT's are ambient all the time. Our water temps are 167F to 172F all the time with our hood, and that is with 13:1 comp. ratio and E85.

No surging.

Painrace

The purpose of the vented hood is to reduce up lift or increase down force by allowing air that comes in the front for cooling and firing to escape. This air getting out easier also improves cooling and pushes down on the vented hood. If you put more air in without a vented hood then the lift will increase but the increase depends on the amount of air in and how easy that extra air gets out. I don't think it would be worth the time an A/B test when Jim Hall has a very good solution.

Jim

HNK

Agreed, I knew the function of the vented hood and its benefits. I wanted more data on opening the NACA duct. The idea of having unrestricted/direct air flow to the filter is great but would have been nice to have actual data. Probably difficult to measure though.

Jim i remember seeing pictures of how you opened the duct up, would you still have them or a link for that?

thnx

Toilets

Can someone tell me where this rear rubber hose is?

Thanks you guys for the aero info. I was looking to removing that black plastic and replacing it with a mesh type still but had no clue it would create more lift...

So if you do remove that duct and replace it with a mesh style would this rubber hose removal help in keeping the lift neutral?

whatcop?

Base of the area holding the windshield wipers.

HNK

Jim,

Would you go without the Beehive if you have a vented hood and opened up NACA duct?

Halltech

I would do what I did. My NACA duct is opened up so that the airflow is directed solely into the Beehive area. If airflow can lift the hood, imagine what it is doing inside the intake system.....

Unfortunately, the Beehive is not sealed, so there would never be enough pressure to make much boost at any speed.

The GT2 hood relieves any pressure that comes from the radiator. The heat waves can be seen rising from the DRED part of the hood stopped at a stop light. Intense amount of heat.

There is a 20-25F degree difference between the coolant temps with and without our hood.

dovervold

HNK

Just to make sure, are you saying with the beehive I dont really need a vented hood? I would eventually need vented hood of some sort to get rid of the underhood heat.

thnx

Halltech

What I am saying is that the Beehive captures all of the NACA duct airflow in so far as the underhood is concerned. Some of the pressure built up will exit below the Beehive, since it is not a sealed unit.

Some worry about surging. I drove our 650 HP Katech built E85 motor yesterday in 6th gear at 45mph and it is smooth as glass.

I will have some videos on YouTube today. I cannot post them here, for obvious reasons.

The Halltech GT2 Hood saves 13lbs over stock, has Direct Radiator Exit Ducting to vent most of the radiator heat; lowers the ECT by 20 degrees; increases downforce on the front end; and is the coolest looking hood on the market today.

We have one in stock in Show Carbon top and bottom. $3400.00

FRDnemesis

Yes, you are right. Some people are asking how to remove everything behind the front bezel so the air can enter directly into the behive. I don't think anyone has come out and said "you have to remove the front bumper cover and dremel and cut. Everyone is dancing around it. They want their setup to look like this:


I think another confusion is this area at the back of the hood that Ranger has talked about opening up. Even that has me confused. Anyone have a pic?


-jeff

dovervold

At the leading edge of the cowl/firewall area, there is a rubber gasket that seals against the rear edge of the hood. You can simply pull this off, and it ventilates air from under the hood. I did this and it helps, lots of engine heat is allowed to escape. At speed you will get some cowl induction effect that will draw outside air into the engine comparment. See blue tape:

FRDnemesis

Thank you for your contribution to this post That's what I was thinking that was, but everyone was calling it hose vs. weather stripping so I was kind of baffled? Now if I could find a step-by-step for removing the wall/baffle behind the NACA inlet duct, I'd be better able to determine if I want to open it up or not.

By the way, I really like your injector cover mod to show off those awesome valve covers! Pretty sharp! Whose signature is on the injector covers?

-jeff

Toilets

Thank you. But, isn't the consensus that removing this piece would infact create front end lift?

dovervold

Doug Rippie of DRM

dovervold

For a street car I don't think it really matters. For a road racer, you may be correct!

Toilets

I'm a hpder. I wonder at what speeds this removal will negatively you?