[Tigers] Tigers Digest, Vol 11, Issue 181
TREVOR NEMETH
blueovalquack at yahoo.com
Tue Jun 18 14:24:23 MDT 2019
Re: Tiger overheating.
You state that your fan is one inch from the radiator and that you are not using a fan shroud.. IMO without a shroud and that much space between fan and radiator, the air is not being pulled through the radiator at idle. Its just churning engine compartment air. All cars use shrouds to pull air through the whole radiator. Pusher fans in front of radiators only cool the area directly in front of the fan, the bigger the better, but they do help. Put a propper shroud in place and you may have solved your problem.Good luck,
Trevor Nemeth
On Tuesday, June 18, 2019, 11:01:26 AM PDT, tigers-request at autox.team.net <tigers-request at autox.team.net> wrote:
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Today's Topics:
1. Re: Tiger Overheating ? Shotgun Approach (Tom Witt)
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Message: 1
Date: Tue, 18 Jun 2019 10:40:05 -0700
From: "Tom Witt" <atwittsend at verizon.net>
To: "Tiger List Serve" <tigers at autox.team.net>
Subject: Re: [Tigers] Tiger Overheating ? Shotgun Approach
Message-ID: <50A67CB0E5D94FFFB40A0D27374F46EE at user1PC>
Content-Type: text/plain; charset="utf-8"
I know this has been a long running problem for you. And as time moves on I can?t remember what has or hasn?t been said. Aside from the obvious (clogged radiator/engine, blades eroded off water pumps, air pockets etc.) there have been other causes of high temperature readings:
1. There might not actually be a problem with the cooling. Rather the voltage regulator for the temp gauge may be defective and causing a higher than actual reading.
2. The lower radiator hose collapses. This typically happens as the rpm?s increase (so not an ?at idle? issue) the lower hose sucks in and pinches flow. A stainless steel spring set internal to the hose (many source this from a lawn sprinkler) prevents the collapse.
The blocking plates and other means of preventing hot air recirculation are helpful. I?ve seen a flat sheet of aluminum between the lower section of the grill area and the radiator. My understanding of the air dam is that it is more effective at speed. I was told it generates a negative air pressure to draw air from the engine compartment. I truly believe a shroud would be very helpful. Otherwise to some extent you are simply churning hot air already under the hood. A well fitting shroud would ensure air is drawn externally. As noted others have found an electric pusher fan helpful.
In this day and age of the GoPro camera I think it would be interesting to to do the old school yarn application and observe what is actually going on under the hood, under the car, and the external areas such as the horn openings and proposed air dam areas etc. A few well placed homemade man-o-meters might be informative too.
Then there are the arguments as to whether a high flow water pump pulls hot coolant out of the engine faster (good) or pushes it too fast through the radiator (bad). Is coolant good because it raises the boiling point, or bad because it is less efficient than straight water. There are the people with a stock cooling system (and sometimes performance enhancements to the engine) that claim they never have a heat issue in a hot climate and those in cooler climates that have stock engines and every cooling enhancement known to Tigerdom and they constantly have issues.
In the end I hope you are successful and enjoy a the summer driving your now running cool Tiger.
From: Joel Martin via Tigers
Sent: Tuesday, June 18, 2019 9:04 AM
To: Tiger List Serve
Subject: [Tigers] Tiger Overheating ? Shotgun Approach
After about a year of struggling with overheating at idle with the hood down, I took drastic steps. I have been driving the car during the last year only on back roads with no chance of traffic lights.
1.. Purchased and installed SS gloss black radiator overflow tank.
2.. Purchased and installed overflow tank straps from Alexander Washick alw6464 at gmail.com which are powder coated.
3.. Purchased and installed undersize water pump pulley from Robert Straghan <rgstraghan at yahoo.ca> scuffed, primed and painted semi gloss black
4.. Purchased and installed horn hole block plates from Don Lutjen <dlutjen55 at gmail.com> scuffed, primed and painted semi gloss black.
5.. Purchased and installed new taller Tiger aluminum cross flow side tank radiator from Griffin Radiator.
6.. Purchased and installed new Flow Kooler water pump BRA-1680 painted Ford dark blue to match engine replacing SS water pump, pressed hub to line up.
7.. Modified the mechanical fan spacer so that front of fan is 1? from radiator.
8.. Mechanical fan remains Flex-a-lite 14? nylon 6 blade fan.
9.. Purchased and installed new SS lower radiator and overflow to radiator hoses.
10.. New top radiator hose from local source as SS hose would not fit taller radiator.
11.. New fan belt.
12.. Purchased and refurbished original Tiger fan shroud which would not fit as I did not want to cut a original shroud top mounting bracket to fit my taller radiator. Stripped, primed and painted used shroud semi gloss black ? sitting on shelf.
13.. Installed 160 degree thermostat.
So at this point I do not have a fan shroud ? unless make up a custom. Other changes could make is front air dam and block front cross member to bottom of radiator spacing but for now I am going to see how things play out this summer.
Results as follows:
Cold start with 86 degree ambient outside temperature ? at idle with hood closed, car in sun.
5 Minutes engine temperature 174 degrees.
9 Minutes engine temperature 180 degrees.
12 Minutes engine temperature 190 degrees.
14 Minutes engine temperature 195 degrees.
16 Minutes engine temperature 200 degrees.
Run the motor at 1500 rpm?s for 1minute temperature drops to 196 degrees.
Run the motor at 2000 rpm?s for another 1minute temperature drops to 194 degrees.
Turn motor off and in a total of 27 minutes from startup - heat soak is 208 degrees.
All this is recorded from temporary mechanical temperature gauge located under dash.
The car temperature at any speed is at 174 degrees regardless of the outside ambient temperature from 50?s to mid 90?s.
Whew, maybe at last can enjoy car with a couple of things still outstanding to be able to drive it out of town for any distance. The Tiger?s first major outing was at the Sandhills Motoring Festival held in Pinehurst NC last month in May ? you can get a glimpse of the cars at: https://www.thepilot.com/gallery/concours-in-the-village/collection_d49fdacc-8091-11e9-86df-2b8021a08259.html You might have to copy and paste link into your browser.
Thank you all for putting up with all my inane questions and comments over the years. I am sure there will be more.
Regards
Joel Martin
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