Fiero Engine bay vs Heat. (Page 3/3)
cmechmann MAY 24, 10:21 PM
Not Fiero but Arduino reply.
The Micro Center Inland brand stuff (Mega) is $10.00. made well and has run enough sketches without error for me to get bored with it. A few weeks I might try my hand at some stm32 series stuff. Cheap blue pill(stm32f103c) and stm32f407vet. They both have native ADCs like Arduino but the libraries are not as broad as Arduino. For the price, memory and speed, I have to at least try.
The last time I had ventured into this stuff was Basic on a Commodore Vic 20. 40 years ago, yeah forgot that stuff. The younger ones have no idea how fortunate they are.
theogre JUL 17, 01:21 PM
Hot and bored so I'm running my data logger again today to see how hot the cabin will get parked in the sun.
Right now the Black Fiero have windshield Mylar shield and "tin foil" under sunroof to reflect heat out but was still pushing 110°F just to put the thing in the car at ~ 10:00 am.
The logger is on the driver side floor in shade w/ DHT22 and thermistor hook to RV Mirror to try to see low and high temps.
Outside temp is 90° w/ HI 103° right now via local real weather station on a net maintain by local university under state gov.

(I use 2 cheap tin Oven floor shields under the sunroof. Easy to fit and don't care when wreck for whatever reason.)
Why?
Many MSM and local new outlets scream cabin temp kills kids etc very easy and while is sadly very true many publish "low" temps like "only" 120-130°F. Years ago Pediatrics publish a paper basically saying 130°F was easy to hit in just minutes and so I did quick test w/ cheap non recording thermometer and saw 160°F in the car on 60° day. IOW (I posted such back them but not search PFF archives.)
So today I'll see how hot the car gets in a day because many "forget" their kids for Hours in cars.
Then maybe try next day w/o the mylar etc to reflect sun light. That's if the logger or battery doesn't die w/ high heat. Most normal electrics don't like operating > 150°F air temp.

ETA-->@ 2:00pm now air temp 93° HI 105°

[This message has been edited by theogre (edited 07-17-2019).]

theogre JUL 17, 10:58 PM
Today's data...
CLICK FOR FULL SIZE

T1 was temp on the Floor. Max was 115°F
T2 was temp at RV mirror. Max was ~ 143°F
max ~ 3pm and that's with windshield and sunroof shields.
Max ambient reported: 95°F at 5pm

Later clouds cut higher temp but even when sun went down and got rain after ~ 7pm did not cooled quickly.
Was a bit surprise the Relative Humidity dropped so much as temp climbed.
Couple data dropout because DHT22 wasn't ready and didn't bother to remove those rows.

Again T2 is just simple Thermistor. setup is very dumb but reads fast and unshielded so gets E noise and while not in direct sun every even small clouds can effect cabin temp some in seconds. So T2 looks like that.

supposed to rain tomorrow. Maybe I'll add a another sensor to chart local ambient outside of car.
theogre JUL 20, 10:56 PM
Today's data... And w/o windshield "sun shade."
CLICK FOR FULL SIZE

Added T3 thermistor to read outside and clean rows w/ invalid data.
at 3 to 4pm
High sensor ~ 157°F
Low sensor ~ 123°F
outside: 100°F

Reported High from local weather stations: 95-100°F

Outside thru bottom of door on shady side on concrete.
a few clouds between 1 to 2 high sensor to see some cooler air but note how fast it recovered and got hotter.
Skybax JUL 24, 07:23 AM
Bump because its summer
theogre JUL 24, 09:41 AM
While most "Bad News" happens in summer... You can't let kids etc in a parked car even on cool days. Even 90 to 100°F cabin temp can kill kids pets etc. I measured 120+ on cool days years ago. Maybe I'll use same as above again on cool and even cold days. I think still have "it" in a box somewhere.

Again in short... These "Bad News" events happen way more then most think because if ever makes "news" that day often only Local News and near a "sound bite" length story even then. So Most people never hear/see news covering this. Some local news Weather people will mention this but only when you have a "Heat Wave."
cvxjet JUL 24, 02:51 PM
Hey Ogre, could you possibly do a couple of special tests? A) Could you do a test of how a window shade affects the cabin temps.....And separately, b) Could you try parking the car at two angles, 1) front windshield towards sun, and 2) Rear window towards sun.


I use a a sun shade most of the time when parked outside, and also I have noticed (But I am not "Cal-E-Brated") that parking rear-window towards the sun keeps the car cooler.
theogre JUL 25, 04:10 AM

quote
Originally posted by cvxjet:
Hey Ogre, could you possibly do a couple of special tests? A) Could you do a test of how a window shade affects the cabin temps.....And separately, b) Could you try parking the car at two angles, 1) front windshield towards sun, and 2) Rear window towards sun.

I use a a sun shade most of the time when parked outside, and also I have noticed (But I am not "Cal-E-Brated") that parking rear-window towards the sun keeps the car cooler.

Above was tested w/ most light going thru back and side direct from sun and > 120°F just after test started. Is likely why only reach ~ 155°F... Sun directly hit windshield only in late afternoon and evening. Don't have space etc to test parking in other ways.

Windshield shades may help or not because there's hundreds to thousands of designs and millions of ways to use them.
I use "bubble sheet" type w/ "chrome" Plus "tin foil" sheet for bottom of Sun Roof. Left the shade off but sheet up for above test.

Then add need several days w/ same weather to test all of that... rare to have 2 days in a row w/ same weather here.

At the time tested years ago, Fiero was park so rear was facing to the sun in last winter or early spring. Sun angle let more sun in thru the side and rear glass and even w/ ~ 60°F outside the thermometer in the cabin was still reading well over 120°F.

So While how you park can affect cabin temps for a given vehicle...
Doesn't charge the fact that a car can kill Kids Pets and wreck a lot of other thing when parked outside.
Over 90°F can be fatal. Over 120°F starts to cook.

Even Leaving side windows cracked and Fiero SR Open (not off) and WS Shade up, the cabin can get very hot.
I have solar vent fans that help because will force air to move out but still gets hot.
But can't do any of that in many places unless you want to get stolen, damage or even ticketed. In many places is actually illegal to park w/ windows open for anti-theft etc.
Dennis LaGrua JUL 26, 06:18 PM
There is some good information on this thread but I believe that the powertrain used would have a huge impact on the engine compartment heat. Is it logical to assume that the engine compartment heat would be the same for the 2.8L/3.4L 3.4DOHC, 3800SC, N*, Ecotech, 4.9L Caddy, SBC, LS1, 2, 3 and 4? It would seem each case is individual.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

theogre JAN 16, 09:06 PM

quote
Originally posted by Dennis LaGrua:
There is some good information on this thread but I believe that the powertrain used would have a huge impact on the engine compartment heat. Is it logical to assume that the engine compartment heat would be the same for the 2.8L/3.4L 3.4DOHC, 3800SC, N*, Ecotech, 4.9L Caddy, SBC, LS1, 2, 3 and 4? It would seem each case is individual.

I didn't see this at the time...

Yes, Different powertrain can be way different or not when testing bay air temp...
Some w/ Turbo likely could see higher peak air temp because of exhaust plumbing.
Some w/ bigger engines could see ~ same peak air temp but cool off a bit or a lot slower after shutdown.

Likely Even matters some just where you read bay air temp in 4cyl. I pick the location because right over the exhaust and cat and close to head.
Remember O2 sensor doesn't work until exhaust is above 600°F. Cats get to 900-1100°F in normal operation. But peak air temp is just pushing 200°F on a very warm day.

Fiero big vents move a lot of air even when parked because of "stack flow" thru the whole bay.
IOW Heat rises and big Fiero vents allow this way easier then nearly all others to cool everything in the bay.

Main point is Most "Claim" Fiero Engine Bay Air is hotter then others because (Fill the blank w/ whatever reason) is 99+% BS.
Most never had FWD etc hoods open when engine is hot or bothered to test engine bay heat. Just push same myth front engines are cooler then all mid or rear engines. And still ignore many front engine cars have tight fitting or sealed hoods and don't have big grills for 20-30 years to give Fractional MPG improvements to bump CAFE points from EPA and related programs in other countries.

For many years now anyone can go to HF Amazon and more to get 1 or 2 channel temp meter w/ Thermocouple for cheap. Many Multi-function meters also read K-type thermocouples too. Yet most won't even use them and still echo same crap that Fiero has engine heat problems.

I have several meters w/ this feature but hard to use when driving w/o someone else just watching let alone recording data.
So now w/ Arduino and needed parts cheap and easy to get (at that time) made data logger and stored in format that Excel and more can use w/o headaches. Above uses thermistors but have several thermocouples to measure actual engine cat and more directly but doesn't really matter testing bay air heat during a run and after shutdown.