Item Subject: cc:Mail Text
The Tiger finally emerged from hibernation yesterday, and the
shakedown cruise was also used to test the theory about raising the
rear of the hood to get more airflow, as we discussed a few months
back.
The hood was lifted by placing a 2" roll of duct tape around the
latch. Tufts of yarn were spaced along the resulting opening, so that
airflow direction could be tracked. The car is basically stock, with
the stock fan, shroud, engine, air cleaner, etc. The horn openings
are not blocked.
Observations:
At rest, just goosing the throttle a bit, produced a noticeable
airflow out of the gap. Turning on my electric fan at idle did not.
At highway speeds, the center area, about the width of the stock air
cleaner is turbulent, but I really couldn't say that there was much
flow in or out. From there outwards, air is just pouring out along
the back and up the sides. One of the tufts about six inches up the
side appeared to blown straight out, at 90 degrees to the direction of
travel.
So it appears that you do get more airflow by raising the hood.
Perhaps the center should be blocked off for the width of the air
cleaner because the flow there looks questionable. Still unanswered
is the main question: Does this added airflow help the cooling? It
was about 50 F when I was doing this, so nothing could be proved.
Stu Brennan
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