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 > > > > > > -- > > Visit the VintagVW archives at > http://www.mail-archive.com/vint...@googlegroups.com > <http://www.mail-archive.com/vintagvw@googlegroups.com> > > > > For help with posting messages, subscribing, unsubscribing or other > needs send a blank email to vintag...@googlegroups.com > > > > For any other questions (subscription status, problems) write to the > list owner at vintagv...@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+u...@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/vint...@googlegroups.com > <http://www.mail-archive.com/vintagvw@googlegroups.com> > > > > For help with posting messages, subscribing, unsubscribing or other > needs send a blank email to vintag...@googlegroups.com > > > > For any other questions (subscription status, problems) write to the > list owner at vintagv...@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+u...@googlegroups.com. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/vintagvw/2041660116.2207302.1664819827995%40mail.yahoo.com > . > > > > > > -- > > Visit the VintagVW archives at > http://www.mail-archive.com/vint...@googlegroups.com > <http://www.mail-archive.com/vintagvw@googlegroups.com> > > > > For help with posting messages, subscribing, unsubscribing or other > needs send a blank email to vintag...@googlegroups.com > > > > For any other questions (subscription status, problems) write to the > list owner at vintagv...@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+u...@googlegroups.com. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/vintagvw/64DEC084-C919-4185-B7D5-8D7F4674B4C1%40uner.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. 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