Don't stop now gentlemen. This is an issue important to us all. I am
dealing with it on my V8 TR3.
I have always heard that raising the hood by the windshield lets the hot air
escape. It was a common quick fix for Sunbeam Tigers so it's got a proven
track record. However, many Chevy vehicles have the famous cowl induction
hood, which is basically a 2 inch gap by the windshield that let's cool air
in. It seems contrary to the raise the hood Tiger theory. Unless, of
course, the cowl induction is ducted straight to the carburetor, which would
use engine vacuum to pull the cool air in.
I have added cut-outs to my inner fenders, exiting into the wheel wells. I
have heard that this IS effective. Alas, the car is not running yet, so no
details for you all.
Anyone else have experience with removing heat from the engine compartment?
Wouldn't a high CFM fan, force the air out, no matter what, for instance out
the back, underneath the car?
Paul Willoughby
Torrance, CA
56 TR3 5.0L HO
----- Original Message -----
From: "Telewest (PH)" <paul.hunt1@blueyonder.co.uk>
To: "James Nazarian" <jhn3@uakron.edu>; "v8" <mgb-v8@autox.team.net>
Sent: Wednesday, August 20, 2003 1:26 AM
Subject: Re: timing
| James - once under way I would have thought that incoming air pressure
would
| have forced the exit of hot air anyway it could, like from the bottom even
| though that is contrary to normal convection, and this is indicated by the
| temp gauge going down and staying down once underway again after a stop.
| While stop even the chronically inefficient factory fans have enough oomph
| to blow air out from under the arches, and I don't have the RV8 cutouts in
| the inner wings. However I have wondered about cutting holes in the
| box-sections that go from the holes at the top back of the inner wings to
| the A-posts, either into the cavity behind the splash panel with another
| hole in that (which will probably just allow water and dirt to fill up the
| space behind it (or direct into the arch area. This would allow an air
flow
| at the top back of the engine compartment which as you said before is
| largely stagnant air.
|
| As far as bonnet pressure goes I have noticed that it tends to *lift* at
| speeds over 55mph, and there have been several posts in the past about the
| bonnet wrapping itself over the screen at higher speeds when the catches
| have failed. E-Type Jag louvres seem to extend forward from the base of
the
| screen slightly *less* then the height of the screen. It would be
| interesting to tape some wool to various of those and see which way the
| airflow goes at various speeds, and it would also be interesting to tape
| some to the unlouvered MGB bonnet at various points along its length and
| across its width.
|
| ----- Original Message -----
| From: "James Nazarian" <jhn3@uakron.edu>
| To: "Telewest (PH)" <paul.hunt1@blueyonder.co.uk>; "v8"
| <mgb-v8@autox.team.net>
| Sent: Wednesday, August 20, 2003 6:32 AM
| Subject: Re: timing
|
|
| > Paul, I was rereading your post and I have another question for the
list.
| > It occurred to me at some point that I have plenty of air coming into
the
| > engine bay but I don't think that I have much going out. ...
| >
| > ... This would also rule out any form of louvering the bonnet as it will
| nearly
| > all be in high pressure air.
|
|
|
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