JohnnyBs68S

How about this one, where they forgot to check for the mounting bolts before performing a "tip-over" move (I had to deal with the aftermath of that as two of our instruments were mounted at the top of that bird when it fell).

I'm not convinced that the W25 scoops are as ineffective as some claim they are. Hasn't anyone other than myself driven a '68 S or 442 in the rain and noticed that as you are slowing to a stop (<20 MPH) that the water that finds its way to the two channels on each side of the center hump rolls forward until it gets near the front edge of the hood and then the air still rushing over the hood (still < 20 MPH) blows it back onto the windshield? Well it takes positive air pressure on the hood surface to do that, and if there is positive air pressure near the front of a '68 S/442 hood at 20 MPH, there is certainly positive air pressure near the front of a W25 hood at about any speed. Certainly, there is a zone of dead air above the hood of a car, but that zone is much thinner near the front of the hood, and it gets thinner at higher speeds.

Also, Volvos have blunt square noses, not a fair comparison.

joe_padavano

Yeah, the NOAA N-prime fiasco is well known in the industry. The real problem with that bird was that a different crew came in over the weekend and "borrowed" the bolts to use on another spacecraft. They "forgot" to return them and didn't notify anyone. Yeah, the rollover procedure is supposed to check the bolts prior to moving, so there was plenty of blame to go around. Out of curiosity, who do you work for?

olds 307 and 403

So removing the headlights or just under the bumper or at the windshield cowl is the only good spot. I wonder how much going past the radiator adds for heat?

pettrix

There was a test done years ago on a W-25 hood and supposedly they measured 7-8 inches of water pressure at 100mph due to the hood scoops. Not sure what that means in the HP field?

No matter what, the W-25 hood looked way cooler vs a stock hood.

I wished I had a non W-25 hood on my 70-72 Olds, said nobody

HighwayStar 442

Old newspaper mail boxes. Use two and make your own 69 Hurst scoops! I kick around that idea for my car for a few years. Are taller to catch the air. Sorry, that one ugly Vette




I can see it now. You guy out in the boonies. I can see pulling them out of the ground and putting in the back of the pick-ups

olds 307 and 403

So in the plastic fenderwells is useless, like I have it. Is there measurable gains if I go under the front bumper? That is the real question, is the effort worth anything on a 350 hp motor?

69455

Modified hood with 2" rise picks up the AIR.
18" pizza pan / 16" pizza pan assembly

JohnnyBs68S

Back then, we were called ITT Defense. We been building satellite-based weather instruments since the early '60s. I cut my teeth on the AVHRR, which first launched in '78, the last one launched in 2018. I eventually became the CSE on that instrument. Talk about a product life cycle. We don't have anything to do with the bird design, but I have spent time on a scaffolding in LMMS's high-bay in Heightstown, NJ (before they moved those operations to Sunnyvale) at the top of one of those birds pulling circuit cards and making DMM measurements, being VERY careful not to drop a screw. I'll never forget the advice given to me as I ascended that scaffold: If you fall, DO NOT grab onto ANYTHING on your way down. Another time we were testing on the floor within feet of pressurized hydrazine tanks. Good times.

joe_padavano

Very cool. I'm marginally familiar with the AVHRR instrument. Our company was the prime for S&MA at Goddard for about eight years.

HighwayStar 442

That is the best setup! Looks clean. Nice work! Do you think it helps??

Koda

Nice "If you fall, don't take anything with you" lol. Hydrazine is not a nice fuel to play with.

If I had time and money to do it, a lexan air cleaner assembly would be neat to combine with an up to 800 cfm or so suction then fog the thing to see where the air actually goes through on a filter element with a filter top. When you replace or recondition an air filter, you can see from whence it pulled. I washed and reoiled my K&N on my Chevy after 20k miles and 16 years and I could, predictably, see dirt on the filter where the base of the chimney pointed. I rotated the filter when I thought about it over those years.

A top entry air cleaner would, presumably, benefit from the air-cleaner-material top. The earlier ones 66-69, I do not think would benefit that much as I would think it would mostly go through the sides of the filter right in front of the hose outlets into the cleaner housing.

69455

Probably a tenth or two on 1/4 mile.
All air is from outside.
Pro's and Cons on everything. I do not drive in the rain.

zekecut70

69455.... That looks terrific! I'm going to give that set up a try. Stay tuned!!. Thank you for sharing.
stupid question.. when you say 2" rise. Was that the air filter or scoops? How tall is the air filter?

HighwayStar 442

The hood scoops. Looks at least 2'' taller. Never mind mail boxes. They look like there ready for package delivery's.

zekecut70

Thought the 2" rise was referring to the scoops, but wasn't sure. Yeah.. the old mailbox scoops aren't exactly a favorite of mine either.

69455

Hood scoops 2" over stock
14" x 2" filter + top
Machined the carb spacer on a angle to match hood.

zekecut70

69455... I just wanted to comment on how nice your whole engine compartment looks. Very well done!

pettrix

what does your car run?

69455

New set up have not been to track yet.
505 complete new Rocket race Engine
625 HP 625 tork, pump gas
Old best was 10.73 125mph

zekecut70

Hauling ***!

pettrix

Impressive! New setup will be much more reliable. No more flexing block like the OEM 455 block which does everything but retain its original shape during high HP runs.
Any modern high HP engine design comes with 4 or even 6 bolt mains. Not sure what Olds was thinking when they designed it with a 2 bolt main cap. Chevy was getting the better main caps, that's probably why.

matt69olds

As someone mentioned, I have noticed rain running down the hood while slowing, and then getting blown back up once it runs off the front of the car. Obviously there is some airflow pushing the rain back.

I have the reproduction under the bumper air scoops. I might someday do a back to back test at the track to verify if the OAI helps. I can tell you I have found grasshoppers, road debris and lots of grass clippings in the air cleaner. Of course, maybe it’s just because they are much closer to the pavement

Kensey

I pity the birds in your neighborhood...

zekecut70

The finished product. Thanks to all you guy's. Appreciate all your input.

fleming442

Nice work!

zekecut70

Thanks fleming442. Good luck with your project. Been following.

allyolds68

I never understood why Olds didn't make the 68 442/Cutlass S hoods with functional cowl induction. Everything is there for it except an air cleaner assembly which utilizes the opening at the rear of the hood. They even placed a foam stopper to plug up the hole that's located there.....

it's on my list of things to do....

I don't think Chevy introduced cowl induction until 69

JohnnyBs68S

I'm with you there, and until I discovered how the factory did OAI w/ the under-bumper scoops (back in the '70s) I too was planning on modifying the hood for cowl induction. However, while its been over 30 years since I've had my parts off the hood for a repaint, I don't recall any foam stoppers plugging up any holes around the "cowl" opening.

allyolds68

BackInTheGame

While I never toyed with cowl induction on the '68 Cutlass S hood, I did consider building some sort of blinker/turn indicator light fixture into that molding. Hmmm.... The wheels are turning again...

fleming442

I'd love to fab some sheet aluminum 67 W-30 scoops. One day, when I get enough round-to-its, it might happen.

JohnnyBs68S

Aye, I never dug in far enough to see that. Just took the grille and top lip off for painting, and somehow they missed getting cleared.

Is there enough cross-section for air flow to make this idea even possible w/o raising up the hood 1-2"? My recollection is that there isn't nearly the cross-section as the 2 bumper scoops.