uh. no.B
what happens is that there is a high pressure system at the rear of the
compartment, with another forming in front of the windshield.B additionally,
a LOW pressure area forms over the center of the exterior of the hood at
speed, helping to lift the hood.B
the only venting that occurs is at the corners of the hood opening, withB air
INTAKE in theB center.B slightB net loss of air flow out of the compartment.
air doesn't move in a straight line, and some of the findings of the manometer
were somewhat counter-intuitive.
if you guys re-read the shop notes from the late '70's and earlier, esp. on
called "the 200 degree panic", you will find there is nothing new being
proposed other than the new aluminum rads, and a more aggressive fan blade.B
and yes, we used sp oilers, too.
best,
rayB B B B
----- Original Message -----
From: "Buck Trippel" <BuckTrippel@Verizon.net>
To: "J. Nichols" <jxnichols@sbcglobal.net>, tigers@autox.team.net
Sent: Friday, July 3, 2009 9:32:38 PM GMT -06:00 US/Canada Central
Subject: Re: [Tigers] I'll Be Dammed!
I certainly agree that Tim's air dam is effective when the car is in motion.
However, on the way back from SUNI we crossed the Mojave Desert when the the
temperature was relatively cool - only 102. The water temperature gauge
indicated 200 which we know means the return water was 180, probably too
cool. This was with a modern aluminum radiator and a small, 13" Derale fan.
However when I was stopped or barely moving for 15 to 30 minutes, waiting in
a line at the Agriculture Inspection Station, the actual temperature rose to
240 by the time I cleared the line.
The problem most Tigers have with overheating is when the Tiger is stopped
or is in stop and go conditions. Tim addressed this low speed problem by
installing an electric (pusher) fan in front of the radiator. After my
recent experience, I'm thinking about doing the same (exept I'll hook mine
up to a big red "Panic" button). B ;-)
An earlier post mentioned the theoretical disadvange to propping a hood open
for engine compartment ventilation. (Reasoning that venting into a high
pressure region is difficult) B I'd like to point out that when a Tiger's
hood latch is not operational, that a stock steel hood will "lift off"
around 70mph (depending on headwind/tailwind). We discussed this at SUNI and
the consensus is that it will only lift seveal inches and then levels out.
However I have seen the light weight LAT hoods still lifting at 6" up,
enough to force a race driver off the track. The lifting hoods indicate to
me that a higher pressure can vent nicely into a high pressure area.
Buck Trippel
----- Original Message -----
From: "J. Nichols" <jxnichols@sbcglobal.net>
To: <tigers@autox.team.net>
Sent: Friday, July 03, 2009 6:42 PM
Subject: [Tigers] I'll Be Dammed!
> "The air dam that Tim Ronack designed and sold is very effective. It
> shears
> air just below the cross member and causes a low pressure behind the
> radiator. The faster the car the more effective it becomes. B The air dam
> is
> very easy to install and when painted black, it disappears. Robin Young"
>
>
> You can get the same affect by mounting a period UK license plate using
> the
> stock bracket under the bumper. B Although, your state has to allow that
> type
> of plate mounted on the front of the car like Michigan does.
>
>
> B B B B B B B B B B B B B B B B B B Jeff
> _______________________________________________
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>
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