Steve, if your hood is already open some at the rear, you might try an
experiment with yarn taped in four or five spots at the rear of the hood and
extend it to within about an inch of the windshield. I predict at lower
speeds, the yarn will be more vertical and as the speed increases and
pressure at the windshield increases, the yard should go more horizontal
indicating less air exiting into the higher pressure area and more into the
decreasing pressure under the car. If you try this, let us know what you
find.
To answer your question about the possibility of the hood blowing up; as
the speed increases a lower air pressure forms along the hood and will raise
it to the point that the air cannot stay conformed to the shape of the hood
and it tumbles putting positive pressure from the air stream against the
hood and lowers it until the air again can conform. There is nothing to act
on bending it forward but, something unpredictable could side load it and
bend either the hood or hinges sideways.
I have unscrewed my stock spring assembly enough that the hood latched about
one inch from closed. Highway speeds were uneventful. Robin Young
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of Steve Sage
Sent: Monday, September 28, 2009 1:55 PM
To: tigers@Autox.Team.Net
Subject: [Tigers] Hood Floating
I'm still getting 100+ degree days here in the desert in Arizona along with
the scorpions and rattlesnakes. This gives me the opportunity to continue
with some Tiger water temperature experimentation.
I never have an overheating issue either way, but with my hood propped open
about 1" in the back in 100+ degrees, at high speeds water temperature runs
about 15 degrees cooler than with the hood closed.
Plus, after stop and go driving, running it up to speed it cools down
noticeably faster than with the hood closed all the way. I've tried this
repeatedly on the freeway and get repeat results. The hood open position
helps my A/C run colder, among other things.
That being said, I don't especially like the way it looks with the hood
propped open, but it's dangerous to change to my longer hood spring assembly
back to the stock shorter one, plus it's a pain. You may remember I had to
unbolt the hood from the front a couple of weeks ago to get it open because
I messed up the alignment with the receiver.
Which brings me to the question: Has anyone tried driving at higher speeds
(70-80 +) with the hood unlatched and, if so, what happens? Does it float
up, and if so, how high? I'm concerned that some kind of aerodynamics might
flip the hood all the way up or bend it forward, which would probably not be
good. For some strange reason I don't want to find this out myself.
Steve Sage
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