Section A - Cooling System, continued.....

Subject: Re: Hoses Date: Thu, 19 Aug 1999 14:58:29 -0700 From: Steve Laifman To: "Daniel S. Eiland" CC: "Tiger's Den" References: 1

Dan,
Sunbeam Specialties has those small pre-bent hoses that go in and out of the firewall. They fit perfectly, and are not expensive.
-- Steve Laifman B9472289

Subject: Re: Horn Holes Date: Wed, 25 Aug 1999 12:55:03 -0700 From: Steve Laifman To: rflynn@dircon.co.uk References: 1 , 2 , 3

Richard F Flynn wrote:
> Steve, > > I did a little empirical test today and decided that when my Tiger is running > sans electric fan, very little air recirculates through the horn holes at a > standstill. However, when I turn on my electric fan, a significantly stronger > breeze is recirculating through them (and its darn warm air to boot). I had not > appreciated this linkage between recirculation and electric fans. > > Might be worth making this point plain to the list once I'm confindent in my > analysis. > > I think I'll mock up some cardboard covers and tape them in place to judge the > effect, but I think permanent covers are a must (especially with that pusher > fan.) > > rick
Rick,
It is well known that the horn holes are a poor design, and it has nothing to do, per se, with the electric fan. You just are able to see the effect without having to stick your hand through the hood at road speed.
As you know, all air that enters the grill must go through the radiator to cool the water. Any air that finds someplace else to go does not accomplish that. The foam seal between the electric fan shroud and the radiator is a good example. When you don't do it, some of the electric fan air comes back out the grill.
The horns penetrate the radiator header, and allow air entering the grill to go around the radiator and into the engine compartment, where it does no good. I have made a duplicate of the horn mounting plate, but 2" longer, and extended the horns into the intake valance area, ahead of the radiator header. In addition, I made some aluminum pieces that match the shape of the header hole, but slightly (1/4 inch about) larger. I put a slot on the bottom to allow the horn extension to fit through, put rubber grommets on the plate for the horn electric wires, and on the left side I put a larger grommet for the radiator tank overflow. This is then taped to the outer wall (inside the intake) with a good Scotch brand automotive double sticky foam used to attach moldings to cars. All the air now goes through the radiator.
Most know of this, but few actually get up the energy to do it.
The same thing happens with the air entering the lower grille valance. It is wide-open down there, and the air can choose to go through the restrictive radiator, or under it. Want to guess which it chooses?
I made a couple of side pieces of 0.030 aluminum that attach to the frame rails (where the jacking hole is), to up as high as there is room, and have a right angle bend below the lip of the lower valance air inlet (not the bottom of the valance). I made a simple sheet, with strategic cut-outs at the back end for the radiator end tank edges and the water drain, and curved the front so sort-of-match the valance. After mounting the side pieces I dry fit the 0.030 bottom by sliding it UNDER the radiator (may have to remove drain spigot) and then brought it forward to the under side of the valance opening hole shelf. Checked and re-trimmed the curve and clearly marked the angle and lower plate for fastener holes. Can't drill holes after you install, except in center.
I removed the pieces, drilled out the holes for the fastener choice, and re-attached the side angles with pop rivets. I put a thick insulating foam tape across the entire inside the inside of the valance, under the bent tab, for the plate to but against. Installed the plate and brought it forward to compress the foam. Put in fasteners of choice to the angle/plate, and slid foam pieces between the plate and the radiator. It does not go past the radiator. If you are clever, you will have left added material and cut the angle from the back, on the side pieces to allow you to bend in the sides to meet the radiator, completely sealing that section and forcing all the air to go through the radiator.
Even fewer have done this. It took me all of 8 hours, using thick art paper for the original templates and design.
Steve
Using pop rivets, sheet metal screws, whatever, I of not letting the
-- Steve Laifman B9472289

Subject: Re: Cooling Mods Date: Thu, 26 Aug 1999 07:52:15 -0700 From: Steve Laifman To: rflynn References: 1

rflynn wrote:
> Steve, > > Could you itemise your cooling mods for me? I'm just trying to keep > up here: > - 6 blade asymetric mechanical fan YES > - 360 degree radiator shroud? NO > - 4 row 14 fin/inch radiator YES > - 13 inch pusher fan soft-shrouded to radiator YES > - blocked off horn holes YES > - blocked off valence gap YES > - air dam? NO >
PLUS:
Gant filter YES Engine Power Back Flush YES Water recovery system YES Good condition hoses with anti-collapse wire in lower hose YES Foam seal around shroud-radiator interface YES Super Stant stainless thermostat with 1/8 inch hole YES
> Also, not to usurp your position as a serious Tiger cooling guru, but > I have this inclination to put together a Tiger Cooling FAQ once I'm > done getting my Tiger sorted. I know that you were working on a web > site and I don't really want to duplicate effort that you have already > expended. Your last cooling treatise to the list was great, but I > was thinking of a FAQ as including a little more background on > cooling in general. Anyway, let me know what you think.
Rick,
A compendium of ALL the list recommendations on cooling, as well as the other technical subjects will be on the site, organized, consolidated from multi-contrubutors, and hot-linked.
BUT, we could always use a good technical article, preferably illustrated with photo's and/or drawings, for major subjects like this. If you would like to think of expanding your FAQ into an article, we could publish it (with your byline) and have it available for all, and for a long duration, not just a fleeting moment on an e-mail list. I have one being prepared on the installation and use of an aluminum radiator, along with adding air conditioning (yes, it's that good).
Thanks for your interest, and let me know of your thoughts.
Steve

-- Steve Laifman B947289

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