[Tigers] Tigers Digest, Vol 11, Issue 181

Tue Jun 18 13:24:58 MDT 2019

All

Thanks for the responses.  I am personally PLEASED with the changes that I have made.  16 minutes at idle to reach 200 degrees or 11 minutes to go from 174 when running to 200 degrees, I think is pretty good, at least based on my previous experience with idle temps rising.  This allows me to drive the car in most any and all conditions.  

I guess from the responses you all do not think so - maybe I am missing something - would not be the first time.  I do live out in the country with around only 90K people in the county so not much city driving.
The water pump upgrade was made more for reducing possible air cavitation or pockets of air than the higher flow of water.

No restrictor in upper hose at this point - tried in the past and removed it - did not seem to make a difference.
Running 50/50 green antifreeze and 16 psi cap.  

Joel

    On Tuesday, June 18, 2019, 2:01:11 PM EDT, 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)
I know this has been a long running problem for you. And as time moves on Ican’t remember what has or hasn’t been said. Aside from the obvious (cloggedradiator/engine, blades eroded off water pumps, air pockets etc.) there havebeen 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 thanactual reading. 2. The lower radiator hose collapses. This typically happens as the rpm’sincrease (so not an “at idle” issue) the lower hose sucks in and pinches flow. Astainless steel spring set internal to the hose (many source this from a lawnsprinkler) prevents the collapse. The blocking plates and other means of preventing hot air recirculation arehelpful.  I’ve seen a flat sheet of aluminum between the lower section ofthe grill area and the radiator.  My understanding of the air dam is thatit is more effective at speed. I was told it generates a negative air pressureto draw air from the engine compartment.  I truly believe a shroud would bevery helpful. Otherwise to some extent you are simply churning hot air alreadyunder the hood. A well fitting shroud would ensure air is drawn externally. Asnoted others have found an electric pusher fan helpful. In this day and age of the GoPro camera I think it would be interesting toto do the old school yarn application and observe what is actually going onunder the hood, under the car, and the external areas such as the horn openingsand proposed air dam areas etc. A few well placed homemade man-o-meters might beinformative too. Then there are the arguments as to whether a high flow water pump pulls hotcoolant out of the engine faster (good) or pushes it too fast through theradiator (bad). Is coolant good because it raises the boiling point, or badbecause it is less efficient than straight water.  There are the peoplewith 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 incooler climates that have stock engines and every cooling enhancement known toTigerdom and they constantly have issues. In the end I hope you are successful and enjoy a the summer driving yournow running cool Tiger. From: Joel Martin via Tigers Sent: Tuesday, June 18, 2019 9:04 AMTo: Tiger List Serve Subject: [Tigers] Tiger Overheating – ShotgunApproach After about a year of struggling with overheating at idle with the hooddown, I took drastic steps.  I have been driving the car during the last year only on back roads with no chance of traffic lights.

   - Purchased and installed SS gloss black radiator overflow tank. 
   - Purchased and installed overflow tank straps from Alexander Washick alw6464 at gmail.com which are powder coated. 
   - Purchased and installed undersize water pump pulley from Robert Straghan <rgstraghan at yahoo.ca> scuffed, primed and painted semi gloss black 
   - Purchased and installed horn hole block plates from Don Lutjen <dlutjen55 at gmail.com> scuffed, primed and painted semi gloss black. 
   - Purchased and installed new taller Tiger aluminum cross flow side tank radiator from Griffin Radiator. 
   - 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. 
   - Modified the mechanical fan spacer so that front of fan is 1” from radiator. 
   - Mechanical fan remains Flex-a-lite 14” nylon 6 blade fan. 
   - Purchased and installed new SS lower radiator and overflow to radiator hoses. 
   - New top radiator hose from local source as SS hose would not fit taller radiator. 
   - New fan belt. 
   - 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. 
   - Installed 160 degree thermostat.

So at this pointI do not have a fan shroud – unless make up a custom.  Otherchanges could make is front air dam and block front cross member to bottom ofradiator spacing but for now I am going to see how things play out thissummer.

Results asfollows:

Cold start with86 degree ambient outside temperature – at idle with hood closed, car insun.

5 Minutes enginetemperature 174 degrees.

9 Minutes enginetemperature 180 degrees.

12 Minutesengine temperature 190 degrees.

14 Minutesengine temperature 195 degrees.

16 Minutesengine temperature 200 degrees.

Run the motor at1500 rpm’s for 1minute temperature drops to 196 degrees.

Run the motor at2000 rpm’s for another 1minute temperature drops to 194 degrees.

Turn motor offand in a total of 27 minutes from startup - heat soak is 208 degrees.

All this isrecorded from temporary mechanical temperature gauge located underdash.

The cartemperature at any speed is at 174 degrees regardless of the outside ambienttemperature from 50’s to mid 90’s.

Whew, maybe atlast can enjoy car with a couple of things still outstanding to be able to driveit out of town for any distance.  The Tiger’s first majorouting was at the Sandhills Motoring Festival held in Pinehurst NC last month inMay – 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 allfor putting up with all my inane questions and comments over the years.  Iam sure there will be more.

Regards

JoelMartin

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