924Board.org

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Use a little pot and keep your cone filter cleaner from splashes, mud, road dust. Drawing air from under is colder than above. Gives some slight ram effect while shielding hot air from radiator & engine.

This pot is polyflexibledurable material, base around 1" larger than the cone and an inch or 2 longer. Chose the best from a variety around your garden or back shed. Old ones that have survived years are clearly more UV resistant than those that have perished or cracked. Bend & squash to test durability. Use a hole cutter/ jigsaw/ box cutter/ whatever to put suitable hole in the base. The upper section (front) is supported by a single 6mm bolt and large flange washer through a drilled hole in the pot and a hole that happens to already be in the light bucket panel. Or simply make one where required. The drainage holes do their job in this application too.

So far have done over 5000 Km and traveled 4 states with no drama. Driven head on into heavy tropical rain and across practically desert. Pot`s still hanging, filter appears much cleaner than before. Not recommended if you regularly risk crossing flooded creeks though.

joejax · Posted: Sun May 23, 2010 10:25 am Post subject:

Great idea RC. How does that intake do for performance? I've been planning for one soon.
It gets seriously hot under hood, it's got to be affecting the way I'm running.
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I got nothin'
Uhhh...you got any pics?

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Definitely improves performance as it does indeed get hot under the hood. Ran while taking many datalogs before and after relocating CAI. Improvement is difficult to measure as there is so many variables and not in temperature controlled conditions. Logged intake temp (pre SC), manifold temp with isolated thermistor, and ambient. So hard to establish a baseline, even ambient temp. Where do you measure it? Inside the car, cabin temp was actually higher that MAT except for heatsoak, especially stationary at lights. Would hang the thermocouple out the window for a reading. Wind chill factor skews data while moving.

Anyway, an averaged and rounded figure is around 10*C below under hood temp while moving and up to 20*C less while stationary. Theoretically every 10*C reduction in IAT results in 3.3% greater air density. Thats 3.3% more oxygen (per fixed volume) and a corresponding increase in HP if fueling is matched. Which it wont be with CIS. Will run richer at higher temps and leaner when lower. However there is probably sufficient leeway to cover the possibility of a drastic lean out. A well set up EFI will compensate fuel and provide optimum AFR for power yet also be more economical for fuel consumption.

Put simply, yes it works, do it. Should feel the difference on the butt dyno especially on warmer days.

Druman · Joined: 19 Mar 2007 Posts: 419 Location: Middleport, Ohio

RC, do you have any pics from the top of the engine. I was just curious how you ran your pipe.

7osh
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87' 924S non-sunroof (Red) 45K miles
85' 944 "early" NA (Red) 130K miles

PORSCHE pisses excellence...

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Sure, but its not exactly stock and undergoes lots of development and changes. Not familiar with the 2.5L engine bay so can`t help with details. Would be a good mod in combination with the MAF swap.

Long before, before, and after.

Looks like its time to upload some more recent pix to the bucket.

Joes924Racer · Posted: Tue May 25, 2010 2:24 am Post subject:

Very nce pics.
Hauls ass huh. Sweet RC.
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1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

macBdog · Posted: Tue May 25, 2010 10:12 am Post subject:

RC is the mech with the most attention to detail on the board engine wise. Top notch stuff.
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1979 931 with a 350 chev
1973 911E with EFI

joejax · Posted: Tue May 25, 2010 10:31 am Post subject:

Wow RC, that is completly incredible. I guess I haven't been paying attention or something, haven't seen that yet.
Don't want to bother with a long list of questions, search be my friend.
Unless you want to tell it again. What the heck kinda air conditioner is that?
_________________
I got nothin'
Uhhh...you got any pics?

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Druman · Joined: 19 Mar 2007 Posts: 419 Location: Middleport, Ohio

Wow! Very nice, clean engine! Thanks for the pics. I don't think I'd have the room for that in my car haha.

7osh
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87' 924S non-sunroof (Red) 45K miles
85' 944 "early" NA (Red) 130K miles

PORSCHE pisses excellence...

Scorpio · Posted: Tue May 25, 2010 12:49 pm Post subject:

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Roger, truly amazing and tasteful work there. I love the COP setup. That bracket in reverse orientation would be really nice for a 931. Any interested in duplicating that too, or providing the schematics?
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erstwhile owner of just about every 924 variant ever made

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Phooeey, just realized that bracket won't work on 931 due to charge tube. Think we both need some more sleep

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erstwhile owner of just about every 924 variant ever made