superloaf

i have access to an old 924 turbo with a NACA duct hood and the header panel. i did some research on here and found that the benefits of more air to these parts isn't the the sure thing i thought, so i'm just wondering if these parts are worth? the hood is in decent to good quality but would need paint and some mild work. the header panel is good with all the plastic duct grills intact.

so is any of this stuff worth grabbing? i can get it for basically nothing but just would want to get rid of it since it's tough to store a hood. i thought i wanted it but then read how more flow to the exhaust isn't such a good thing. i guess maybe if you're racing but i understand now why otherwise not so much.

anyways, just seeing what kind of info i can learn.

also, how does the header panel attach on the 931? is it interchangeable with our cars? our's just bolt off but the 924 looks more complicated. it looks welded but not sure as i've seen cannell's car with one bolted on.

ok, thanks and maybe i can save some rare porsche parts as my friend's friend has to dump this old car.

V2Rocket

i may be interested in both the hood and nose panel.

333pg333

Header panel doesn't fit and the Naca vent is not applicable for us either.
Sell them to Spencer.

V2Rocket

where in LA is the car? maybe i could go check it out to see what the condition is like

User 41221

No one ever believes me when I tell them this, but the nose panel vents do more harm than good on a 951. I've done fluids modeling on it and it causes a vacuum lock in front of the intercooler, but the folks that sell them still seem to do a bang up business. My comments don't apply to the Lindseys unit that has the extended lip, as I haven't modelled that one (nor am I inclined to go through the hassle).

If you want to do something to help your car, put a relief vent behind the intercooler (ala 968 Turbo RS). The Naca duct on the 924 Turbohood fed straight into the intercooler, so it made sense for that car. It has no value on a 951 unless your cruise control servo runs hot. lol

superloaf

no, i believe you. when i saw this, i read up a lot on here and saw that there was no advantage to these items. otherwise, i'd put them on my car. so i'm just trying to see what kind of value these have and who might want them.

one thing about the naca duct though is that some people move them on the hood to vent to the turbo area. also, i would think that in a racing environment, the duct as it sits might help to alleviate the ridiculous temps that 951's see under the hood. and i would think that with constant full throttle, the turbo won't miss any of the exhaust heat. of course, then you still have to worry about air going under the car and causing lift. so who the hell knows?

regardless, there are some folks who might want these for whatever reason. and the naca duct is pretty cool, i have to admit.

but does anyone know if the 931 header panel is spot welded on? or will it unbolt?

Dougs951

IIRC it is welded on.

333pg333

The NACA duct is designed to let air in, not out.

gt37vgt

er .... come on Pat you mean specificly the one on a 924 ...??
we have all seen NACA ducts installed either way for air in or out ..

333pg333

Ok just for the pedants....NACA duct on the 931 which is the subject of this thread is designed for letting air in, not out.

alxdgr8

924 Turbos didn't have intercoolers...the NACA duct fed onto the turbo/exhaust manifold. The 924 Carrera GT's didn't have NACA ducts, but had a hood scoop leading directly to the top-mount intercooler.

alxdgr8

Correct...need a spot-weld cutter to remove it.

gt37vgt

cut around the naca duct and install it eh other way .

Cole

Just Google "naca ducts' and you can find all kinds of sources for them.

Buy one put it where you want it.

User 41221

Thanks for the correction, alex. I have not owned a 924 turbo, altho I do have a 924 Turbo on my '84 944.

Regards,