Re: [vintagvw] Air scoops, theoretically...

Dave C. Bolen Tue, 04 Oct 2022 07:39:24 -0700

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 intothe engine compartment at the end of the fiberglass scoops. I also have afiberglass 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 thelicense 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 ampushing compressed(who know how hot) engine air into the intake. Thisdoen'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 Idon'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 rearwindow the air floww "delaminates" from the car causing a vacuum in therear.


The sides of the car "seem" about the same.

I am reminded of some of the gene berg writings where he is trying to testair scoops on a pre 67 bus....he finally gives up as just having the frontwindow 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 Idrilled 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 <vintagvw@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.johns...@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

--
Visit the VintagVW archives at
http://www.mail-archive.com/vintagvw@googlegroups.com
For help with posting messages, subscribing, unsubscribing or other needs send
a blank email to vintagvw+h...@googlegroups.com

For any other questions (subscription status, problems) write to the list owner
at vintagvw+ow...@googlegroups.com
---
You received this message because you are subscribed to the Google Groups "VintagVW
- Air Cooled Volkswagen Discussion List" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to vintagvw+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/vintagvw/CAOm0kBnBq46tJCC5VJX5xQJDXMQwEiHmZ_62ky9z0P3rS8Xx6A%40mail.gmail.com.


--
Visit the VintagVW archives at 
http://www.mail-archive.com/vintagvw@googlegroups.com

For help with posting messages, subscribing, unsubscribing or other needs send 
a blank email to vintagvw+h...@googlegroups.com

For any other questions (subscription status, problems) write to the list owner 
at vintagvw+ow...@googlegroups.com

---You received this message because you are subscribed to the Google Groups "VintagVW - Air Cooled Volkswagen Discussion List" group.

To unsubscribe from this group and stop receiving emails from it, send an email 
to vintagvw+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/vintagvw/alpine.DEB.2.22.394.2210040918310.775431%40dcb-Gazelle-Professional.localdomain.

Re: [vintagvw] Air scoops, theoretically...

Reply via email to