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> Random's Intake Temp Testing, reprinted from old article
oiml8
post Sep 5 2006, 06:48 AM
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QUOTE
Well, I've done my first round of temp testing, and I'm amazed. Amazed and Appaled.

Test appartus. Fluke 54-2 Datalogging Thermometer. Test Probe #1. Stock airbox. Probe next to stock air temp sensor. Test Probe #2. Stock Intake manifold. Probe Inside runner #2. 1" Upstream from port. Probe .75" up from port floor. Probe surrounded by .5" of silocone to insulate probe from metal heat.

It was 60-61F the night of the test. Both probe's read this prior to starting. Probe #1 stayed at 60-61F at the start. Installing the intake manifold to a warm block warmed T2 up 10F in the time it took us to install it and tighten up all bolts. Not good!

I don't have the "starting" datalogs, but I'll do another set. This datalog set is after driving for 5 miles, letting the engine sit for 8 minutes (off) then driving 5 miles home. (so these readings start "warm"

"max" airbox temp 104.3F
"max" intake port temp 153.3F
"max" temp difference 56.9F

I'll post up the "text" of the datalogs tonight.

This is with at 100% BONE STOCK setup.
Stock airbox
stock resonator
stock TB WITH COOLANT HOSES
stock IM

What I learned....
#1. The intake ports get HOT QUICK, and it doesn't really cool down when you floor the engine
#2. The stock airbox heats up rather slowly, but once hot, doesn't cool down either.
#3. The "temp" at the airbox was easy to affect by doing high RPM (high air flow) driving, however cooler airbox temps didn't equal cooler port temps. SO the incoming air CAN quickly cool down the airbox and the stock IAT reading, but that reading doesn't translate to cooler air at the ports.

I don't know if this is the coolant hoses heating up the air, the stock IM transfering heat from the head, both, or neither. (could be radiant heat from the head/valve affecting the temp probe. I doubt it, but it's possible).

I'll have more photos and data graphs along with (hopefully) a new datalog that goes from 100% cold to 100% hot.

T1 T2 T2-T1
90.4F 129.9F 39.5F
87.9F 136.6F 48.7F
88.5F 140.5F 52.0F
89.5F 143.7F 54.2F
90.5F 146.2F 55.7F
91.7F 148.3F 56.6F
93F 149.8F 56.8F
94.2F 151.1F 56.9F
95.5F 152.3F 56.8F
96.7F 153.3F 56.6F
98.5F 139.9F 41.4F
104.3F 130.6F 26.3F
101.1F 123.8F 22.7F
96.1F 119.1F 23.0F
91.3F 114.4F 23.1F
92.6F 124.4F 31.8F


I'll be eventually removing the resonator and doing this again, also the stock airbox in favor of a CAI. I'll also be removing the coolant hoses and installing a Phenelic Spacer(I'll show folks how to make one) between the IM and the head, each step will be documented, and datalogged. This is just my "preleminary" data, and it was simply too shocking NOT to share.

--------------------------------------------------------------------------------------------------------------------------------------------------


Well, the stock airbox isn't really helping either. After just 20 minutes of running, the air in the airbox went from 54.5 to 82.7 F

I then let the car sit for 60 mintues (had to go into work) After "cooling" for an hour, the air box was 99.6F!!!!!!! (port temps were also sky high at 120.6F. This is on a 54 degree day with light rain!!!!!!

Can you imagine how bad it is going to be on a "hot" 100+ degree day?

Here are the latest numbers.

Port Temp...Air Box Temp.......Temp Increase.....Time Stamp
54.5...............54.5...............0.0...............3:17:28 PM
56.7...............56.9..............-0.2...............3:19:37 PM
60.9...............59.9...............1.0...............3:20:38 PM
60.9...............59.5...............1.4...............3:21:39 PM
61.0...............59.3...............1.7...............3:22:40 PM
69.6...............60.9...............8.7...............3:23:41 PM
74.1...............62.0..............12.1...............3:24:42 PM
81.3...............65.5..............15.8...............3:25:43 PM
82.9...............66.6..............16.3...............3:26:44 PM
82.7...............71.6..............11.1...............3:27:45 PM
88.1...............78.3...............9.8...............3:28:46 PM
83.6...............77.1...............6.5...............3:29:47 PM
87.0...............75.9..............11.1...............3:30:48 PM
86.8...............73.3..............13.5...............3:31:49 PM
96.7...............74.3..............22.4...............3:32:50 PM
99.5...............74.8..............24.7...............3:33:51 PM
106.6..............81.6..............25.0...............3:34:52 PM
104.7..............83.2..............21.5...............3:35:53 PM
119.8..............82.7..............37.1...............3:36:54 PM
120.6..............99.6..............21.0...............4:34:04 PM
116.4..............96.1..............20.3...............4:35:05 PM
114.9..............92.9..............22.0...............4:36:06 PM
112.3..............94.1..............18.2...............4:37:07 PM
109.2..............92.7..............16.5...............4:38:08 PM
104.0..............93.7..............10.3...............4:39:09 PM
103.6..............87.1..............16.5...............4:40:10 PM
107.0..............83.1..............23.9...............4:41:11 PM
111.1..............86.2..............24.9...............4:42:12 PM
113.7..............88.8..............24.9...............4:43:13 PM
112.8..............96.7..............16.1...............4:44:14 PM
114.1..............96.5..............17.6...............4:45:15 PM
130.3..............93.7..............36.6...............4:46:16 PM
129.3.............108.5..............20.8...............5:28:57 PM
117.1..............99.7..............17.4...............5:29:58 PM
122.4..............98.2..............24.2...............5:30:59 PM
122.3..............97.9..............24.4...............5:32:00 PM
123.1..............99.5..............23.6...............5:33:01 PM
123.6.............100.2..............23.4...............5:34:02 PM
115.9.............100.9..............15.0...............5:35:03 PM
123.9.............106.6..............17.3...............5:36:04 PM
125.7.............105.7..............20.0...............5:37:05 PM
116.3.............109.9...............6.4...............5:38:06 PM
116.5.............100.9..............15.6...............5:39:07 PM
103.4..............91.9..............11.5...............5:40:08 PM
100.8..............83.9..............16.9...............5:41:09 PM
90.1...............79.9..............10.2...............5:42:10 PM
96.1...............78.6..............17.5...............5:43:11 PM
102.7..............78.9..............23.8...............5:44:12 PM
106.3..............83.1..............23.2...............5:45:13 PM
125.6..............81.4..............44.2...............5:46:14 PM
129.7..............81.9..............47.8...............5:47:15 PM
132.9..............83.3..............49.6...............5:48:16 PM
119.3..............89.5..............29.8...............5:49:17 PM
109.9..............96.9..............13.0...............5:50:18 PM
114.1..............98.1..............16.0...............5:51:19 PM
116.2.............101.1..............15.1...............5:52:20 PM
122.8.............106.5..............16.3...............5:53:21 PM
135.8.............105.1..............30.7...............5:54:22 PM
140.1.............102.9..............37.2...............5:55:23 PM

Keep in mind, this is a 54 degree day. The air box/resonator gets darn hot and transfers a lot of that heat to the incoming air. I'm hoping a CAI keeps the intake air much cooler coming in, but We'll have to see if it works out that way.

--------------------------------------------------------------------------------------------------------------------------

Sorry, I should have explained. The "dips" in the port temps are due to WOT operation. If you notice, the airbox temps are fairly static, a slow steady rise. The port temp is very eratic, due to the close throttle/open throttle change of state.


And that is the last I ever heard. RDTiburon seems to be down right now. He may have posted more results over there.


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