Intake Temperature Logging|
To test the effectiveness of my custom cowl induction intake we used a computer temperature probe. The unit used is a CompuNurse Dual sensor thermometer, used to monitor temperatures of internal computer parts and bought on the internet for $10.
Ambient temperature was measured at the base of the windshild by a probe attached to the passenger wiper arm.
A small hole was drilled into the intake plumbing just before the throttle body and sealed with RTV silicon. The probe itself extends into the air flow about .5 to .75 inch.
Click for a close-up:
The speed for each data plot was recorded but is not represented in the standard graphs. Please email me for the Excel spreadsheet if you want the gory details.
The stock intake was 100% stock. The modified intake design can be seen here. Additionally the modified intake was wrapped with a space age material commonly known as "shredded carpet fuzz with aluminum foil glued to the back". This can be seen here. The effectiveness of this at keeping the intake from soaking ambient engine bay heat is unknown, but I suspect that it's effect is minimal unless you could wrap every square millimeter accurately, which I lack the patience for. It was a fun idea that couldn't hurt.
The most important factor effecting the intake temperatures was the velocity of the air in the intake tract. Under heavy acceleration or heavy throttle usage you could watch the temperature go down. The modified intake would commonly drop 7 degrees from idle by the time I reached 3rd gear. While this was most noticable with the modified intake, the stock intake also exhibited this behavior to a slightly lesser extent. The stock intake temperatures were more affected by road speed than engine speed. This is no doubt due to the fact that the stock intake relies on fresh air movement for cooling, while the modified does not.
Note that once done with the experiment I sealed the test hole with epoxy. The hole was tappered so there is no way the epoxy plug can work loose and get sucked into the engine.
Side note: The CompuNurse Dual *can* display in Fahrenheit dispite claims otherwise. You have to take it apart and trigger one of the un-used buttons inside it. :-)
Charts and interpretation:
Combined city and highway travel #1
Combined city and highway travel #2
Highway only travel
Annecdote: Butt dynamometer calibration:
Despite the fact that the modified intake sounds and feels faster at all RPMs, and contrary to the fact that colder air results in more horsepower (and it was colder at the TB, estimated 1hp for 10 degrees Fahrenheit) a WOT test of acceleration from 75 to 90mph took 12 Mississippis with both the modified and the stock intake at similar ambient temperatures. The WOT tests were conducted during the morning runs so it is likely that the similar times were caused by the very similar intake temperatures of that run series. It is also possible that while at this "high" speed and running in 5th gear that the horsepower increases afforded by the intake do not make an improvement measurable by a Mississippi based timing system. It is the author's belief that a one-onethousand or one-elemeno based timing system may have more telling results.
Also check out Dan's Cold Air Box for more inspiration!
Copyleft Mark Leinhos
Last modified 08/04/15
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