Mongo

Not too long ago Tony made a post about drilling airboxes and a design that someone came out with from britain in the picture below:



The way the intakes are arranged on this one still sucks in hot air. BUT....what if you have inlets in the hood? Jacquemond makes a hood i believe with holes in it near the same area! perhaps you can use those to duct to the filters for cold air intake or even RAM Air!!! That would make our cars happy happy happy!! <img src="graemlins/a_smil17.gif" border="0" alt="[blabla]" />

<img src="graemlins/burnout.gif" border="0" alt="[burnout]" />

Porsche928Driver

You've nailed it on the nail's head. The intake on the 928 is almost perfect to begin with.
Cool air it taken in from outside the engine compartment. I don't understand why anyone would add those K&N air filters under the hood (check out the riceburners the kiddies drive that are all the rage now).
Porsche also has the hot engine compartment air flowing out from the windshield side of the front hood. There are several companies that have done one better with cold air being taken it with:
1. NASA type hood air inlets, mounted near the front or rear of the engine hood.
2. Modified air intake from the front of the radiator, creating a "positive" air flow pressure at high speeds &gt;85 MPH.

The forward air intakes are the best...ask anyone who proffesionally races the 928's...


<a href="http://clik.to/PORSCHE928DRIVER" target="_blank">Porsche 928 Driver Website</a>

Normy

Porsche-

Those twinks in the Honda's are annoying to be sure, but they have one thing figured out: K&N cone filters make your car sound cool when the throttle plate is open!

-I mean, think about it. Their little cars aren't fast, and really, the whole rice/import thing is about profiling anyway, so filters like this that add good sounds to the picture are big plusses.

[Yeah, I know...I have a weed-whip too!]

I don't recommend this on Porsche 928's. It is not correct for the character of our cars.

Someone on here did an analysis with thermometers a while back and discovered that our cold air intakes aren't all that cold. I'd love to figure out a way to improve what we already have...

Normy!
'85 S2 5 Speed

Greggg

I've come up with a plan.... It will look a little weird, but if it works I'll post the pics and results. 87 S4 BBS (Bilge Blowen Shark) <img src="graemlins/c.gif" border="0" alt="[ouch]" /> <img src="graemlins/c.gif" border="0" alt="[ouch]" />

AO

Greg:

On your BBS (Bilge Blowin' Shark), now that you can regulate whether you have positive air pressure or not at any time... would it be possible to duct something past the radiator and condensor to provide cooler air flow? I think the reason Porsche may have NOT done this is that every time you have a bend in the ducting, you decrease the potential airflow volume that can passthrough. Or another way to look at it is that it takes more force to push the same amount of air through. So, given t hat, plus the stock Porsche is not equiped with the BBS upgrade
I think there might be a way to craft some ductwork to accomodate some cooler airflow. Looking at the picture again, I think you'd have to be careful to not obstruct the rad or condensor.

Let me know if you want help with this. It's a fun project! <img src="graemlins/burnout.gif" border="0" alt="[burnout]" /> <img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />

doc18015

Hello: My '81 STROSEK has the two air ducts in the hood directly above the factory air intakes(engine compartment). With the hood closed, the outside air is fed to the engine. The only negative effect is the engine heat to the intake tubes.....wrapped, pretty much solves the problem. I have a K&N in place of the stock filter. The induction sound is greater as well as throttle response.

Mongo

Doc by holes directly above intakes, did you mean you cut holes in the hood right where the intake tube inlets are at? if so than you created a ram air effect on your car. <img src="graemlins/a_smil17.gif" border="0" alt="[blabla]" /> i had this idea a while back but I never really took it into consideration seeing that we didn't have a 928 back then. Now that we do, I'm thinking of picking up a hood in the wrecking yard and seeing if i can make it a ram-air hood with inlets near the front. I figure if Pontiac can do RAM air on a trans-am, <img src="graemlins/oops.gif" border="0" alt="[oops]" /> its not hard to do it on a 928 seeing how the intake tubes are positioned

<img src="graemlins/burnout.gif" border="0" alt="[burnout]" />

Mongo

ok guys i found the hood idea i had for that intake setup above that i posted. It's from the Jacquemond site and the 928 looks pretty tricky If any of you have been to their site, they have some pretty kickass body kits as well as clear corners for your 928. the URL is <a href="http://www.jacquemond.com" target="_blank">www.jacquemond.com</a> enjoy the pic below.

Chris Lockhart

Eurospec, if you're really interested in a hood with NACA (not NASA) ducts installed at the front over the inlets on top of the radiator, Mark Anderson has one in stock at 928 International. Only problem is that it also has a cowl induction scoop on it that looks kinda cheesy. Take off the cowl induction scoop, clean it up and paint it, and then you'll have a nice hood. He has it reasonably priced too. If I had the extra $$$$ right now, I'd buy it myself. To me, this set-up along with some decent thermal wrap on the tubes and airbox would give you the best way to get cooler air to the engine, while maintaining a mostly stock appearance and function. <img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />

Mongo

I'd like to get a picture for it. I'm going to keep my stock hood and put the ram air one on for track days or legal drag races, but I'm reconsidering that since i'm going to dump about 4,000 in my 944 for an engine rebuild, stroke up and supercharger.

<img src="graemlins/burnout.gif" border="0" alt="[burnout]" />

Greggg

Hey Andrew, yeah I was looking at duct work this weekend. Actually, today I bought some PVC pipe and am playing with ideas to configure direct tubing to the air inlets. The biggest hurddle will be fittment over the radiator. With the hood closed, the space there is very slim. I got $6.00 invested in the project and I project I'll spend another $6.00 before it's over! <img src="graemlins/roflmao.gif" border="0" alt="[hiha]" /> , I'll give you a call later this week for some experimentation. <img src="graemlins/roflmao.gif" border="0" alt="[hiha]" /> <img src="graemlins/c.gif" border="0" alt="[ouch]" />

AO

Greg:

Been thinking about this a lot today (they shut down my division at work today! There are a lot of sad people, but they got rid of me 2 months ago, so I'm well beyond that. Time to sit and think cars!)

So I was thinking, since the intakes are on top of the radiator, and there is very little room to duct anything tubular, why not take a sheet of the insulation you have, tack it in place on top of the radiator just in front of the intakes. Then, somehow (this is the tricky part) take the front edge and tack it in place of the vents. In essence you would be dividing the airflow between the radiator and the intakes. This should help prevent hot air from spilling into the intakes. And since our sharks are not very prone to over heating, it should not affect engine cooling much at all. Just a thought.

One thing I do know is that after we get you car running smooth, I'm up for 2.0!


<img src="graemlins/burnout.gif" border="0" alt="[burnout]" /> <img src="graemlins/burnout.gif" border="0" alt="[burnout]" /> <img src="graemlins/c.gif" border="0" alt="[ouch]" />

Big Dave

Greggg....you crack me up!

I'd love to see your set up when it's done! <img src="graemlins/roflmao.gif" border="0" alt="[hiha]" />

Andrew: what line of work are (were) you in? We've got a lot of client contacts.

KBlair

Greggg, have you thought about mounting some air temp sensor INSIDE the ducts? That way you could get a baseline and before/after, etc. should be cheap as well.

Greggg

Hey guys, yeah I bought the temp sensor at radio shack, just have not had time to rig it. Too many ideas, not enough time..... <img src="graemlins/crying.gif" border="0" alt="[crying]" />