|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
07-04-2014, 02:48 PM | #1 |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
Road Test of Stant vs. Shewman Thermostats
I wasn't really interested enough in such a comparison to do it but have received several repeated PM requests to repeat the test I did last year comparing no thermostats to Stant thermostats (here: https://www.fordbarn.com/forum/showthread.php?t=113979) but this time comparing Stant thermostats to Shewman's "High Flow" thermostats. So, I did it exactly the same way I did it last year but on two consecutive days rather than a few days between. The ambient temperature on the first day when the Stant was tested was 92° and on the second when Shewman's was tested 90°. The details of the test are otherwise described in last year's thread referenced above. The data from the test is in the attached PDF file. Hopefully VeryTangled will graph them again for us like he did last year.
The data confirms what I predicted about Shewman's stats last year here: https://www.fordbarn.com/forum/showthread.php?t=112889 Post # 85. Because Shewman's stats do not completely shut off the water flow when closed the engine takes much longer to warm up to proper operating temperature (3 miles/7 minutes longer) and that operating temperature is not maintained (it drops 40° below the stat setting) when going down a long descent with no throttle. (Many have not even been able to get their engines up to operating temperature in the winter with Shewman's stats. See here: https://www.fordbarn.com/forum/showthread.php?t=121447) Then, on the other end, because Shewman't stats have a much lower flow than the Stants when fully open (33% less) they allow the engine temperature to raise much higher faster than the Stants, up to 10° higher. That is enough difference to boil or not boil over (and was for me). One other big difference - the Stant stats are $18.00 a pair compared to Shewman's at $50.00 per pair. I'll be putting the Stants back in. NOTE: THIS TEST WAS ONLY OF SHEWMAN'S STATS FOR THE 59A ENGINE NOT THE ONES FOR THE 8BA. Here is the graph of the data later created by VeryTangled with his graph of the elevations he made last year added by me and the numbers re-aligned by 51 MERC-CT to read a little easier.
__________________
Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 07-06-2014 at 10:36 PM. |
07-04-2014, 03:37 PM | #2 |
Senior Member
Join Date: Nov 2010
Location: NM
Posts: 2,438
|
Re: Road Test of Stant vs. Shewman Thermostats
Nothing like real data, thanks! I've had no issues with the Stants.
__________________
'52 F-1, EAB flathead |
Sponsored Links (Register now to hide all advertisements) |
|
07-04-2014, 04:17 PM | #3 |
Senior Member
Join Date: Feb 2011
Posts: 794
|
Re: Road Test of Stant vs. Shewman Thermostats
|
07-04-2014, 04:25 PM | #4 | |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
Re: Road Test of Stant vs. Shewman Thermostats
Quote:
So, for allowing the highest water flow at high temperatures in the 59a, Shewman's stats can't be beat. For fast warm up, particularly in cold weather, the stock Robertshaw (without the holes drilled in it) would be better. For 59a, Shewman's stats have no advantages, only disadvantages.
__________________
Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 07-05-2014 at 12:54 AM. |
|
07-05-2014, 12:53 AM | #5 |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
Re: Road Test of Stant vs. Shewman Thermostats
Later today did a 150 mile round trip to Mirror Lake climbing up over 10,000 feet. On the way down the Shewman stats let the engine get clear down to 120° for the 30 miles coming down the mountain, 60° below their rating of 180°, the temperature that they opened when tested before installing them. So, the holes drilled in them really do defeat the purpose of a thermostat.
__________________
Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
07-05-2014, 06:27 AM | #6 |
Senior Member
Join Date: May 2010
Location: Near Rising Sun, Maryland
Posts: 10,858
|
Re: Road Test of Stant vs. Shewman Thermostats
Sponsored Links (Register now to hide all advertisements)
__________________
John "Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein Last edited by JM 35 Sedan; 07-06-2014 at 11:16 PM. |
07-05-2014, 06:53 AM | #7 |
Member Emeritus
Join Date: May 2010
Location: Fitzgerald, Georgia
Posts: 2,204
|
Re: Road Test of Stant vs. Shewman Thermostats
Well, as they say in the movie "Used Cars"---this "blows the hell out of those high prices".
|
07-05-2014, 08:28 AM | #8 | |
Senior Member
Join Date: May 2010
Location: East Shore of LAKE HOUSTON
Posts: 11,113
|
Re: Road Test of Stant vs. Shewman Thermostats
Quote:
Could not have said it any better. DD |
|
07-05-2014, 08:45 AM | #9 |
Senior Member
Join Date: May 2010
Location: (Not far enough...) Outside of DC
Posts: 3,387
|
Re: Road Test of Stant vs. Shewman Thermostats
Chart
__________________
-Jeff H Have you thought about supporting the Early Ford V-8 Foundation Museum? |
07-05-2014, 09:15 AM | #10 | |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
Re: Road Test of Stant vs. Shewman Thermostats
Quote:
It's pretty easy to criticize without any contradictory data or even personal experience. Not very persuasive though. If you don't have any way to refute the message all you're left with is to kill the messenger. It doesn't take a rocket scientist to do exactly the same thing twice, changing only one thing, record the data and report it. Interpretation of the data may vary but the data itself are facts that can't be disputed.
__________________
Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 07-06-2014 at 10:30 PM. |
|
07-05-2014, 10:02 AM | #11 |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
Re: Road Test of Stant vs. Shewman Thermostats
Thanks to VeryTangled for graphing the test results for us. I added his graph of the elevations he made for the identical test last year and the numbers were re-aligned by 51 MERC-CT to read a little easier.
__________________
Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 07-06-2014 at 10:35 PM. |
07-05-2014, 10:29 AM | #12 |
Senior Member
Join Date: May 2010
Location: Julesburg, Colorado
Posts: 714
|
Re: Road Test of Stant vs. Shewman Thermostats
The graph does not look right to me as the bigger numbers should be on top all the way along.
|
07-05-2014, 10:36 AM | #13 |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
Re: Road Test of Stant vs. Shewman Thermostats
[Numbers rearranged by 51MERC-CT] The numbers for the Stant are above its line and the ones for Shewman's below. So, when Shewman's line goes above the Stant line the numbers look upside down but are still in the same orientation to their line as for the entire graph.
__________________
Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 07-06-2014 at 09:11 AM. |
07-05-2014, 10:43 AM | #14 |
Senior Member
Join Date: May 2010
Location: so cal, placerville, vegas
Posts: 1,394
|
Re: Road Test of Stant vs. Shewman Thermostats
Old engineer's 'creed'... If you have something that is working well, and you try to make it better, if you screw with it long enough, eventually you will f**k it up.
I ran this same test several years ago, on another engine (the other brand, sbc350). It's a vehicle/engine that has always had overheating problems during the 40+ years that I've owned it. I got exactly the same results. Stock stat went back in. |
07-05-2014, 10:56 AM | #15 |
Senior Member
Join Date: May 2010
Location: (Not far enough...) Outside of DC
Posts: 3,387
|
Re: Road Test of Stant vs. Shewman Thermostats
Hi Everyone, gearhead1952, I agree. [edit: Oops I see Prof. Henry beat me to the comments.]
The numbers below the data point are for the Yellow/Shewman's stats. Numbers for the Magenta/Stant are above the data point. Because the lines cross in a couple of places, the numbers where they cross look weird. A good example is the last two points. The yellow is 189 and the magenta is 182.
__________________
-Jeff H Have you thought about supporting the Early Ford V-8 Foundation Museum? |
07-05-2014, 11:23 AM | #16 | |
Senior Member
Join Date: May 2010
Location: East Hartford, Ct
Posts: 5,898
|
Re: Road Test of Stant vs. Shewman Thermostats
Quote:
__________________
DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES |
|
07-05-2014, 11:28 AM | #17 | |
Senior Member
Join Date: May 2010
Location: Julesburg, Colorado
Posts: 714
|
Re: Road Test of Stant vs. Shewman Thermostats
Quote:
|
|
07-05-2014, 02:34 PM | #18 | |
Senior Member
|
Re: Road Test of Stant vs. Shewman Thermostats
The statement . So, the holes drilled in them really do defeat the purpose of a thermostat I go along with .The idea of a thermostat is it opens and shuts to maintain and maximise working tempt ,From my experience you only need to drill one hole in it to screw up its function ,Ted
Quote:
|
|
07-05-2014, 02:37 PM | #19 |
Senior Member
Join Date: May 2010
Location: Solihull, England.
Posts: 8,755
|
Re: Road Test of Stant vs. Shewman Thermostats
The results look pretty convincing to me, I use stock type 'stats in mine, with a very small hole drilled to allow filling and air purge.
When I say stock they are the common type found on UK Minis and the like from the sixties. Mart. |
07-05-2014, 04:04 PM | #20 |
Senior Member
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 4,527
|
Re: Road Test of Stant vs. Shewman Thermostats
Common sense prevails here.
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|