Alpine951

One of the mods I have thought of but never seen to 951's is doing away with the restrictive snorkle that runs from the air box to the fender. I would replace it with a naca duct on the hood that is ducted and sealed directly to the air box just like Porsche did to the 968 turbo's. This way the naca duct picks up the cold boundary layer of air that is traveling over the hood. I have never seen or heard of anyone doing this to a 951. Seems to make a bunch of sense to me.


John
86 951
48k miles daily driver

Russ Murphy

John,
Check out Lindsay Racing's project car

Russ Murphy

Sorry about that. Let me try again with the image.
Otherwise, here's the web page<a href="http://LINDSEYRACING.com/project/944main.html" target="_blank">Lindsey Project Car</a>

Alpine951

If you look closer, you will se that the naca ducts Lindsey has are in the nose panel where the head light would be. That is because they are using thier MAF and a cone filter.
<a href="http://www.lindseyracing.com/" target="_blank">http://www.lindseyracing.com/</a>

I am talking about a naca in the hood where the stock airbox is.

Alpine951

<a href="http://boards.rennlist.com/upload/968_Turbo_S_1.jpg" target="_blank">http://boards.rennlist.com/upload/968_Turbo_S_1.jpg</a>

<a href="http://boards.rennlist.com/upload/968_Turbo_S_5.jpg" target="_blank">http://boards.rennlist.com/upload/968_Turbo_S_5.jpg</a>

pig4bill

You could never drive in the rain again. That duct would make a wonderful funnel for the water.

Alpine951

That is something I have wondered about. But is that a problem on the 968's. And what about the ram air induction cars of the sixties. A little water that is injested is not harmful. Its probably beneficial for turbo's. Ever hear of water injection. I have been trying to find or see pictures of the naca duct on these cars to see if water would actually flow down into the air box when stationary. But I have to think that Porsche would not have put this duct on when water could pout right in.

David Salama

I also wanted cool air directed at my K and N filter / MAF. I cut a hole in the front apron underneathe on the drivers side and directed a duct from there through the fender in the compartment in front of the wheel directly to the hole where the stock duct connects in front of the coolant tank. I tested it with a blower and I get a nice flow of cold air into my engine comparment. Since the duct is low, there is no concern about rain entering.

pig4bill

Yes, you'd never have to worry about rain entering a low snorkel as long as puddles never form where you drive in the rain. 944's are famous for running through puddles, water soaking the air filter, getting into the engine and shattering the block.

All the 60's cars I remember with hood scoops had horizontal entries rather than a funnel-shaped tray that would seem to pour the water into your intake. I have no idea about 968's, I've never looked at one very closely.

David Salama

Since there is no actual suction on the low snorkle vent, the water does not seem able to climb two feet on its own. I have had this system for six months, rain and shine, and have never had water enter my engine compartment.

JGriff

As probably seen in another post, I swiss-cheesed my airbox recently on my S2, and so far, it seems to be a worthwhile upgrade.

I have a fiberglass slotted nose, and a factory nose. My only concern with the slotted nose is possible water ingestion (from rain... I don't plan on driving in deep puddles), given that the small holes I drilled in the airbox are now somewhat directly in the airstream.

Here's the URL of the mod:

<a href="http://www.geocities.com/MotorCity/4475/Porsche/airboxmod.html" target="_blank">Airbox Mod</a>

Please take a look at the webpage, and give your feedback relative to water ingestion. Do you think the holes are small enough that only a minimal amount of rain might get in? I suppose I could spray some water at the front with a hose, and then take a look inside the airbox, to see how wet it gets. However, that type of test really isn't indicative of reality, since the car is not moving, and air (and possibly water) is not being sucked in. Besides all that, it could turn out to be a very expensive test!!

I currently have the factory nose back on, but I've noticed that the paint doesn't match perfectly (i.e. the PO had it repainted, but the place obviously didn't match it well). If need be, I'll have it repainted, if I end up deciding to keep the factory nose on.

I drove the car today with the factory nose on, and the performance wasn't worse than with the slotted nose.

Also, FWIW, the slotted nose doesn't fit perfectly (i.e. not a smooth line with the hood), as compared to the factory nose.

What's your vote? Factory nose or slotted nose?

Thanks.

Jim