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Dutch924-racer
Joined: 23 Jul 2007
Posts: 1081
Location: The Netherlands
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 Posted: Sat Jul 10, 2010 1:41 am Post subject: Lower engine temperature by modifying bonnet |
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If you read this:
http://maverick-924turbopch.com/
They say the temperature dropped with 22 degrees.
I am building a top mount intercooler Carrera GT style. Using a GT hood scoop.
It will drag cold air on to the intercooler, but the hot air can't get out. Has anybody thought about putting a vent next to the hood scoop to let hot air out?
Or is there a better way to get the hot air out? I don't care much for the looks, its for my race car.
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937 trackday car
Series 2 engine
951S turbo and intercooler
Fast road camshaft
Forge recirculation valve + boost controller
Last edited by Dutch924-racer on Sat Jul 10, 2010 3:14 am; edited 1 time in total |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Sat Jul 10, 2010 1:58 am Post subject: |
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That's an interesting car for sure!
Regarding the exit for the CGT intercooler, it has to flow down and out under the RHS footwell. The lower belly pan assists with this, as it has the reverse of those hood vents on the bottom of the pan.
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erstwhile owner of just about every 924 variant ever made |
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Joes924Racer
Joined: 03 Nov 2002
Posts: 11964
Location: Oregon, Denver Colorado native!
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| Posted: Sat Jul 10, 2010 2:07 am Post subject: |
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Yea you never kept up on your original post on your project ..How is it goin..do you want to give up some pictures, Id like to see.
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1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo. |
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Dutch924-racer
Joined: 23 Jul 2007
Posts: 1081
Location: The Netherlands
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| Posted: Sat Jul 10, 2010 3:16 am Post subject: |
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| ideola wrote: | That's an interesting car for sure!
Regarding the exit for the CGT intercooler, it has to flow down and out under the RHS footwell. The lower belly pan assists with this, as it has the reverse of those hood vents on the bottom of the pan. |
Never had the belly pan on the car, but that might be a good idea.
_________________
937 trackday car
Series 2 engine
951S turbo and intercooler
Fast road camshaft
Forge recirculation valve + boost controller |
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Dutch924-racer
Joined: 23 Jul 2007
Posts: 1081
Location: The Netherlands
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| Posted: Sat Jul 10, 2010 3:17 am Post subject: |
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| Joes924Racer wrote: | | Yea you never kept up on your original post on your project ..How is it goin..do you want to give up some pictures, Id like to see. |
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Intercooler project is almost finished, I am waiting on some taps to finish it. I will post pictures when finished.
_________________
937 trackday car
Series 2 engine
951S turbo and intercooler
Fast road camshaft
Forge recirculation valve + boost controller |
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Cedric
Joined: 27 Aug 2004
Posts: 2806
Location: Sweden
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| Posted: Sat Jul 10, 2010 5:55 am Post subject: |
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| Dutch924-racer wrote: | | ideola wrote: | That's an interesting car for sure!
Regarding the exit for the CGT intercooler, it has to flow down and out under the RHS footwell. The lower belly pan assists with this, as it has the reverse of those hood vents on the bottom of the pan. |
Never had the belly pan on the car, but that might be a good idea. |
i would be careful with that, probably better flow without, the pressure under the car is lower and thus sucking the air by itself. My friend got severly lower oil temp on his n/a by removing that panel.
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1980 924 Turbo
www.instagram.com/garagecedric/ |
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Grenadiers
Joined: 20 Feb 2007
Posts: 3222
Location: Nelson, WI & Prescott, AZ
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| Posted: Sat Jul 10, 2010 6:30 am Post subject: |
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I have 3 turbo cars, and none have a belly pan. Fall off on the road somewhere? The 924S I had, had one though.
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'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke |
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RC
Joined: 25 Mar 2007
Posts: 2637
Location: Australia
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| Posted: Sat Jul 10, 2010 6:33 am Post subject: |
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That link says:
| Quote: | | The ASAP PCH featured a hand modified louvered functional hood that dropped engine temperatures 22 degrees |
I say that if that is the case then there must be some serious problem with the cooling system.
Now under hood temp drop sounds feasible. 22* F, WTF is that in real measurements? Have to convert but how? The stupid F unit of measurement is not linear but relative.
http://www.csgnetwork.com/tempconv.html
Regardless of where and how was that quantified, just under the hood must be the most inefficient location possible for an intercooler.
Its also satisfying knowing my slushbox will do it in a 0-60MPH.
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fiat22turbo
Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR
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| Posted: Sat Jul 10, 2010 9:50 am Post subject: |
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Wow, is it just me or is that car kinda ugly?
Louvered hood? What is this a hot rod? Did someone get a new louver making machine and decide to practice on the car? Don't get me wrong, they work.
I think in the long run, they'd have been better off using a fiberglass hood and building a single reverse scoop to help direct the air flow through the radiator, intercooler and oil cooler. Less weight and less labor.
Nice work on the bodywork, very smooth and good quality paint. Though why did they leave the repeaters on the front and quasi-french them in?
I will say that the power numbers are impressive and I do like the wheel choice. I wish there were some pictures of the engine bay and the interior though.
As to the original question, I would say that I think it was simsport who had tested and implemented a reverse hood scoop on his car to good effect. Basically, instead of a bunch of smaller louvers, he made one large one just aft of the headlights.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose) |
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931Owner
Joined: 14 Feb 2009
Posts: 352
Location: Chicago NW Suburbs
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| Posted: Sat Jul 10, 2010 11:16 am Post subject: |
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| fiat22turbo wrote: | | Wow, is it just me or is that car kinda ugly? |
It got beat with an ugly stick it did, how else could you make all those holes?
As for the belly pan it helps with the drag co-efficient. Removing the pan produces more turbulent air under the car causing more drag. You will notice higher fuel consumption as well.
The Fiat 600 underneath is nearly flat the whole length of the car and it is one of the contributing factors as to why the 600 based Abarths (my picture) beat the Mini Cooper so often. You will notice many of the new performance cars with a flat underbelly and louvers or channels to assist air movement.
I also noticed on the A6 an increase in fuel consumption without the belly pan on trips, so I put it back on.
Luckily, my 931 was complete, and it still has it's belly pan and timing belt covers. That darn belly pan was a PITA to remove though with rusted bolds and a bent lip on the lower valance.
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1980 Turbo
-too many cars and too many motobikes |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Sat Jul 10, 2010 11:27 am Post subject: |
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| fiat22turbo wrote: | | As to the original question, I would say that I think it was simsport who had tested and implemented a reverse hood scoop on his car to good effect. Basically, instead of a bunch of smaller louvers, he made one large one just aft of the headlights. |
You may be thinking of Steve Bassington's car, which was specifically set up as a low pressure duct for the intercooler, not quite the same intended effect as these louvers, which are designed to evacuate heat from the engine bay.
Steve's car:
Simon's car:
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erstwhile owner of just about every 924 variant ever made |
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Dutch924-racer
Joined: 23 Jul 2007
Posts: 1081
Location: The Netherlands
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| Posted: Sat Jul 10, 2010 5:07 pm Post subject: |
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I know Steve's car, but never seen Simon's car. Any more info/ pictures on that 931 racer ?
_________________
937 trackday car
Series 2 engine
951S turbo and intercooler
Fast road camshaft
Forge recirculation valve + boost controller |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Sat Jul 10, 2010 9:59 pm Post subject: |
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| Dutch924-racer wrote: | | I know Steve's car, but never seen Simon's car. Any more info/ pictures on that 931 racer ? |
Simon = simsport. I'm sure you've seen his car before. Here's an album full of pix:
http://picasaweb.google.com/streetlegalporsche/SimsportSSuperCharged924#
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erstwhile owner of just about every 924 variant ever made |
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avaconirl
Joined: 25 Dec 2009
Posts: 48
Location: Ireland
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| Posted: Sat Jul 10, 2010 11:03 pm Post subject: |
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To help the cooling under the bonnet and to use the aerodynamics to help pull out the air but keeping the smooth look of the car.
Remove the scuttle at the battery and on the opposite side of the heater fan. Create new walls on the left and right of the fan so there are no fumes from the engine to the fan.
As the wind passes over the gap between the back of the hood and the lower section of the windscreen it creates a vacuam drawing the hot air from the engine bay.
If you do not want to remove the whole wall then drill large holes in the scuttle maybe 1 1/2 "or 2 |
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