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K&N Typhoon Tests

Intake Air Temp Test 2.

Surface Temperature of Aluminum Intake Tube

Test 1 determined probable air temperature at point of intake. However this is not the same as determining what the temperature is when it is ingested into the engine. What about heat soak into the Typhoon unit as the air travels along the aluminum pipe? Tests 2, 3 and 4 attempt to determine surface temperature on the pipe itself. Knowing this temperature should tell us the potential (but not necessarily the actual) maximum internal air temperature.

Note: Click on any image for a larger view.

The sensor element was placed as far down the tube as possible, nearest the engine block, but facing front. The duct tape should insulate the sensor at least from the direct wind coming in from the grille. We'll account for this variable in the next test when we place the sensor in the rear of the tube.

On startup, temp is essentially the same both on the tube and outside.

To warm up the car we'll drive down the hill (thru a mile or so of stop/go town driving) to Ocean Ave., which is essentially a tourist-laden street with no stops for a couple of miles. Slow speeds of 20mph mean a nice gentle warmup. that we can use to get an initial idea of whats going to happen here. As you can see in the pic there's no wind so thats not going to affect things.

Down the road a ways and well before the end of the warmup route the engine is fully warmed up. Temp is only 3 degrees above outside and speed is a slow, constant 20mph.

At the end of the route near Asilomar temp has only climbed a couple of degrees, mostly thanks to uneven speed. Temp seems to fluctuate very quickly with a bit of throttle.

After Asilomar we climbed fairly steeply at 30-35 mph for a mile or two. Tis is the stop light at the top of the hill, and ends the in-town portion of the test.

Cruise control at 65, shortly after arrival on the highway and after a drive to the freeway that entailed steep climbs, and a descent, all at about 45 mph.

Constant at 65 mph and on flat ground, temperature quickly falls until it reaches a steady 73 degrees.

Same flat ground, increase speed to 75 mph. No temp change.

Same ground. Lets try 85. Note the temp is inching up outside.

Final shot of the run -- A series of WOT run-ups to heat up the motor as much as reasonably possible, then decelerate to a stop at the offramp stoplight and take a picture.

Matt Robertson's small picture
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Matt is the Managing Partner at Leland-West Insurance Brokers, Inc. He started with the firm while still a college student, way back in 1984. According to Matt his only remaining hobby is Motorsport ... because its all he can afford ("will work for tires"). Reach him at matt@lelandwest.com