Safe limit for Intake Air Temps..

[EchoBallin]

Hello all, I did a little searching on the upper limit for intake air temps and couldnt find much.

This summer, I plan on throwing the hottest air I can into my Echo's engine, while running premium to avoid predetonation (10.5:1 CR). Is there any problems to be encountered running 150degF+ air into an engine?

[ksa8907]

Ive seen mine max out the sensor at 200. Normal in the summer is about 150. 9.1:1 with 87. Though I do mix with e85 to reduce knock under hard acceleration.

[EchoBallin]

Good grief! 200 is pretty impressive. Did you notice any extra gain at that heat level? Or did the gains stop at a certain temp?

[gone-ot]

Until detonation actually occurs, the rule-of-thumb is 'higher-the-better' for economy...and, the SAFE *way* to know if you're approaching detonation is to monitor the IGNITION AVANCE / RETARD signal from your engine...via SGII or UG. When you notice the IGNITION advance numbers going DOWN (ie: engine sensor has detected 'ping') it means you're getting close to detonation conditions.

Typicial progression is: PINGING comes first, then DETONATION.

[Cobb]

Most modern ignition systems will just retard the hell out of the timing to match the temperature to keep the engine safe.

The gen 2 honda has a 10.8 to 1 cr and it starts to retard the hell out of the timing when the coolant rises above 190 and the intake goes above 130.

[ksa8907]

At highway speeds it will maintain 40° advance at 200. Mind you the motor is also under very light load and running around 2200rpm.

Benefits start to drop off after 150-160. But again, warmer is better.

[echo-francis]

in the summer my intake temp is about 130F but it represent the temp under my hood because I mostly sealed it and I removed the small pipe that goes from my air box to my headlight. but my battery do not like to be at 140-150f. if I see that temp I will remove some grill block. but I think there is no problem to go higher in intake temp as long as your under hood temp do not rise as well

[EchoBallin]

Okay, cool. I'll try to watch the timing advance and see what happens. I've noticed how temperature is important for mpg since it is cold here now. 0-30 degree F intake air really sucks. Needless to say, I'm stoked for summer!

EchoFrancis-
I also took that tube off of the airbox, and was thinking..it would probably be better to pull in air from the other side of the airbox (back of the engine). I might do this by cutting a hole on the back side of the airbox and plugging the stock hole. That would raise IAT a bit more without raising under hood temps anymore

[UltArc]

Mustang seems to be peaking at 220, best range is 200-220. Insight goes as high as 213, best range seems 200-213. Neither shows any type of error or issues at these temperatures.

I am not familiar with the pinging or otherwise.

Edit: Whoops, these are coolant temps- I don't measure Air Temps, my mistake.

[zingaro]

I was having a temp rise of only 20 to 30 deg F over outside air temp. So my first try at modifying the air intake system resulted in temps around 120 with an OAT of 40 deg F.
I was thinking I had overdone it but sounds like its in the ball park


I removed the intake scoop and made a cover out of al flashing . the red is the upper radiator hose. its on a Honda crz