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chardorcher
Joined: 05 Oct 2021
Posts: 21
Location: MALTA EU
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 Posted: Wed Jan 04, 2023 10:28 pm Post subject: Cooling the engine bay |
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Has anyone experimented with ideas of how to keep the engine bay cool, extracting the heat from the carb area especially. i was thinking of doing one or two air ways coming from front or bottom of front car area. One could blow on the exhaust and maybe the other letting fresh air in to the carbs.. I would use air tubing since I think this would direct the air better than just putting holes in the bonnet and fitting vents. Im sure vents work though also. I had a guy suggesting I fit some sort of 12 volt type extractor in an area near the exhaust but i think this would be taking it too far. Im told these engines work better if cool/ed.
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924RACR
Joined: 29 Jul 2001
Posts: 8815
Location: Royal Oak, MI, USA
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| Posted: Thu Jan 05, 2023 1:07 am Post subject: |
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Doesn't seem necessary. We run with stock bodywork, full-beans racing, and cooling is fine. Stock rad, just needs an oil cooler added.
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Vaughan Scott
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chardorcher
Joined: 05 Oct 2021
Posts: 21
Location: MALTA EU
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| Posted: Thu Jan 05, 2023 2:09 am Post subject: |
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| 924RACR wrote: | | Doesn't seem necessary. We run with stock bodywork, full-beans racing, and cooling is fine. Stock rad, just needs an oil cooler added. |
Temperatures here in Malta go 40+ in summer, though my concern is really the hills I am to visit in Sicily once the car is running and set up proper, just don't want to heat up in those hills alone. Advice on oil cooler taken though as it was on my list, probably move it up a bit on the shopping list now that i know it would effect cooling.
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11724
Location: PacNW
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| Posted: Thu Jan 05, 2023 4:50 am Post subject: |
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Running with the bottom cover installed is the easiest way to keep air moving through there.
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Cedric
Joined: 27 Aug 2004
Posts: 2614
Location: Sweden
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| Posted: Thu Jan 05, 2023 5:03 am Post subject: |
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| Rasta Monsta wrote: | | Running with the bottom cover installed is the easiest way to keep air moving through there. |
A friend tried with and without on his car on track, removing it lowered the oil temps by a measurable amount, not an issue with an oil cooler Though.
Open carbs in the engine bay that sucks hot air isnt a great idea, an air box and snorkel would help that.
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Fifty50Plus
Joined: 28 Feb 2008
Posts: 1361
Location: Washington DC area
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| Posted: Fri Jan 06, 2023 3:49 am Post subject: |
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I run an oil cooler in front of part of my radiator on the race car and temps are fine with full race setup. I've also run with and without the plate under the engine and can't tell any difference in temps.
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1982 924 NA race car - Sold
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1982 924 Turbo nice body, blown engine
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Various 944s to become IT-S race car |
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924RACR
Joined: 29 Jul 2001
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Location: Royal Oak, MI, USA
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| Posted: Fri Jan 06, 2023 7:27 am Post subject: |
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We run without the pan, because it's massively in the way for any work on the engine.
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Fifty50Plus
Joined: 28 Feb 2008
Posts: 1361
Location: Washington DC area
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| Posted: Fri Jan 06, 2023 7:38 am Post subject: |
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Work on the engine???? It's a Porsche. It doesn't need any work....
OOps, I forgot. It's an Audi.
Actually, my engine has been bulletproof for 5 seasons. Changed the oil every season. Still no leaks.
When I get my new H-Prod engine done, I'll be bringing the car into the shop to do some triage on the old engine. I'm curious about the leakdown but the butt dyno has been saying all is good for the past 4 years. Lap times were the same for those years and when I put in the H-Prod cam this year, I knocked off a half second. Looking forward to a big bump in compression and lighter weight engine parts.
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1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11724
Location: PacNW
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| Posted: Fri Jan 06, 2023 3:49 pm Post subject: |
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| Cedric wrote: | | Rasta Monsta wrote: | | Running with the bottom cover installed is the easiest way to keep air moving through there. |
A friend tried with and without on his car on track, removing it lowered the oil temps by a measurable amount, not an issue with an oil cooler Though.
Open carbs in the engine bay that sucks hot air isnt a great idea, an air box and snorkel would help that. |
Air dam, or factory nose?
Also, not surprising that oil temps are reduced with finned pan hanging in the breeze, but I still think overall movement of air (and under hood AIR temps. ..OP's question) is improved with belly pan.
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- WeiBe (1987 924S 2.5t) - 931 S3
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chardorcher
Joined: 05 Oct 2021
Posts: 21
Location: MALTA EU
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| Posted: Sat Jan 07, 2023 2:47 am Post subject: |
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| Rasta Monsta wrote: | | Running with the bottom cover installed is the easiest way to keep air moving through there. |
That was removed(previous owner) referring to the bottom cover , should I refit then? Im trying to extract/blow away/cool any hot air produced from the engine especially from the exhaust side , and if possible not boxing the webers as this will muffle the sound produced by the same carbs. I am going to test fit a tubing system direct towards the exhaust from the front of the car forcing fresh air on to the exhaust maybe this might help ccol the area or let more fresh air produced by the speed in. I am going to try to do the same on the carb side also, in theory this should feed the area with fresh moving air towards the carbs, I will have to find a method to take temps with or without these.
I just asked maybe you guys having experience with these cars have set up your own systems , yet it seems the normals have been put to practice too.(oil cooler/ dam removal etc)
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Fifty50Plus
Joined: 28 Feb 2008
Posts: 1361
Location: Washington DC area
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| Posted: Sat Jan 07, 2023 3:10 am Post subject: |
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Keep in mind that on race cars, we remove the fan. If you still have one on your car, you already have air blowing across everything all the time. Wasting your time on trying for extra air flow. The only thing the factory did in that regard was for the alternator. They also designed the belly pan to help in that area so for a stock engine, put it on. Vaughan has removed his for ease of maintenance and mine is gone due to weight.
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1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car |
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chardorcher
Joined: 05 Oct 2021
Posts: 21
Location: MALTA EU
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| Posted: Sun Jan 08, 2023 12:47 am Post subject: |
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| Fifty50Plus wrote: | | Keep in mind that on race cars, we remove the fan. If you still have one on your car, you already have air blowing across everything all the time. Wasting your time on trying for extra air flow. The only thing the factory did in that regard was for the alternator. They also designed the belly pan to help in that area so for a stock engine, put it on. Vaughan has removed his for ease of maintenance and mine is gone due to weight. |
Got it Fifty,, so I will re fit the pan, yet doesnt the fan throw onto the rad only,, is it known then that the air blown from the fan tends to 'spread itself' possibly when hitting the fan as this was not considered by my self and would be of great importance if so.
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safe
Joined: 18 Mar 2017
Posts: 591
Location: Sweden
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| Posted: Tue Jan 10, 2023 8:28 am Post subject: |
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When you are driving, above 50 km/h you have pretty good airflow and the temperatures are slightly above ambient. Driving slower then the temp rises.
If slow traffic is an issue you can try removing the rubber seal between the firewall and hood. You run the risk of getting hot engine air into the fresh air intake...
If you find a rood way to extract hot air from the engine bay, I'm interested. My car get too hot under the hood driving slow.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
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morghen
Joined: 21 Jan 2005
Posts: 8884
Location: Romania
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| Posted: Tue Jan 10, 2023 5:51 pm Post subject: |
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| safe wrote: | | If you find a rood way to extract hot air from the engine bay, I'm interested. My car get too hot under the hood driving slow. |
Hood vents?
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safe
Joined: 18 Mar 2017
Posts: 591
Location: Sweden
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| Posted: Tue Jan 10, 2023 6:03 pm Post subject: |
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| morghen wrote: | | safe wrote: | | If you find a rood way to extract hot air from the engine bay, I'm interested. My car get too hot under the hood driving slow. |
Hood vents? |
May have to do that, but I would like to avoid it cutting up my turbo hood.
Also I'm not sure it would work that well. The hot air "piles up" near the fire wall (can get up to 120 C when stopped), its that air I would need to remove and if I do a vent there I might bugger up the air flow at speed.
I would really like to be able to remove the air by a fan, many new cars do it like that.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
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Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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