Jeff
Careful when you say ram-air affect for the carb. Ram-air affect
works best when the scoop is sealed to the carb which will eliminate heat
escaping from the engine because of the seal.
I believe most scoops work the way you think they should at highway speeds
and lower but everything changes very quickly, exponentially maybe the
correct term here, as speed increases.
Every car is different but a reversed scoop or any scoop that is not sealed
to the carb can actually ram air past the carb creating a low pressure zone
at the carb inducing a lean condition at high speed and that could grenade
the engine.
I'm no expert about this and I have never experimented with scoops so I have
no real data about this subject . I'm simply relaying information that
makes sense to me which I have gathered over the years.
NASA took decades to make some scoops work the way they needed.
Ron Fraser
-----Original Message-----
From: tigers-bounces+rfraser=bluefrog.com@autox.team.net
[mailto:tigers-bounces+rfraser=bluefrog.com@autox.team.net] On Behalf Of
Jeffrey Nichols
Sent: Monday, August 25, 2008 11:37 AM
To: CoolVT@aol.com
Cc: tigers@autox.team.net
Subject: [Tigers] Hood scoop and cooling holes
"I don't know what the pressure area is where the hood meets the cowl in
front of the windshield, but if I leave my hood propped open about an inch
I don't see much difference at all in engine temperature. So it makes me
wonder how much air is escaping."
You may want to try a hood on the lines of the "Super Tiger" hood that is in
the TBON. The scoop is reversed to pick up the high pressure air located by
the windshield. . When stopped, the opening would vent hot air out of the
engine compartment and while in motion it would have a ram-air affect for
the
carb. I've seen these turn up on Ebay every once in a while. Someone may
have made a small run of this style hood back in the day.
What ever happened to the "Super Tiger"? Does it still exist with the
options Ian Garrard installed?
Jeff
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