Andy,
More like the speed of the vehicle is pushing fresh cool air into the
engine area.
Cheers, dave
On Tue, 4 Oct 2022, andy wrote:
Maybe the reason the roof scoops are working the best is because the hot air is
rising out of it and has a place to go?
On Tuesday, October 4, 2022 at 9:39:20 AM UTC-5 Dave C. Bolen wrote:
Guys,
Ok, I have a megasqirted turboed 1776 in my 68 bug.
I have the fiberglass side scoops and 2" holes drilled thru the body into
the engine compartment at the end of the fiberglass scoops. I also have a
fiberglass scoop that goes across the entire vent area above the decklid.
I also have a covertible decklid with a couple of 2 inch holes behind the
license plate.
The turbo is a lowbugget turbo that sits in the engine compartment.
All engine seals are intact and seal pretty well against the turbo pipes.
Stock doghouse oil cooler with vortex ring on the fan intake.
On a 100 degree day on a 23 mile backroad trip I run around 240 degrees.
If I push the turbo a lot I can push 260 or better but at that point I am
pushing compressed(who know how hot) engine air into the intake. This
doen't happen often because engines don't like hot air on intake.
My opinion is that none of the scoops really helps.
The only thing that really makes a difference is decklid standoofs(which I
don't really like). With standoffs I can keep it a 220 all day long.
Ok, this is the internet age so go to google and ask for
air cooled vw bug wind tunnel
Thre are some new ones in there but this is the one I have watched
more than a few times.
https://www.youtube.com/watch?v=LtXOUrTc_dA
Basically what it look like to me is that from about the top of the rear
window the air floww "delaminates" from the car causing a vacuum in the
rear.
The sides of the car "seem" about the same.
I am reminded of some of the gene berg writings where he is trying to test
air scoops on a pre 67 bus....he finally gives up as just having the front
window open or the vent window open makes a big difference in air flow.
I did buy a CFM Anemometer and plan to use it on the two side holes I
drilled but it hasn't happened yet.
Cheers, dave
On Mon, 3 Oct 2022, Eric Ridvan Üner wrote:
> So this is anecdotal, but I do know of two people who, at the same time
used side scoops on one beetle, and a roof scoop on the other
(with a cool
> flame job on a pseudo dune-style bug). Neither has stock engines. The
side scoops were not at all effective, and the owner ended up
with a new
> decklid. The roof scoop was, in contrast, pretty effective, but still
not ideal.
> This was actually the opposite of what I expected.
>
> Disclaimer: I am not an aeronautical engineer. But ... I can imagine
the faster flowing air over the surface of the curved hood and
roof creates a
> slight vacuum. That might reduce the amount of cool air unless the
scoop goes as close to the windshield as possible. The side scoops
might not have
> that vacuum, so I expected them to be more effective. Also, there was
more area for a greater volume of air to enter. I think perhaps
the lack of
> vents combined with the scoops just created turbulence and trapped warm
air, and the flat(ish) undercarriage did not create enough
vacuum to pull the
> warm air out.
>
> This is an observation based on no data and two vehicles 20 years ago,
but that's all I've got. :-)
>
> On Oct 3, 2022, at 12:57 PM, 'Ray Yoder' via VintagVW - Air Cooled Volkswagen
Discussion List <vint...@googlegroups.com> wrote:
>
> Things are looking up. A vintagVW post
>
> Sent from the all new AOL app for Android
>
> On Mon, Oct 3, 2022 at 1:02 PM, D Johnson
> <dean.g....@gmail.com> wrote:
> I'm asking for a friend... Actually this is a theoretical question
only, I'm not really thinking about doing this.
> Has anyone converted the Super Beetle moon-shaped air inlets behind the
rear quarter panels to route cool air to the engine
compartment?
> I know I've seen engine-swapped beetles with air intakes in plexiglass
rear quarter windows. But for a stock engine, if you wanted to
use
> a non vented deck lid, could you get enough air through the side vents
if you put scoops on them? I'm intellectually curious if this
has
> been done and what internal modifications would need to have been made.
>
> I"m putting a new gas tank in my '71 super and will be trying to
resurrect the dual carbs this winter, hoping to have it on the road
> again next year. It's been off the road due to both a catastrophic
transaxle failure and a near catastrophic valve failure since 2008.
> Life happens.
> Fingers Crossed and I hope everybody is staying safe and sane out there.
>
> Dean
>
>
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