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08-02-2013, 12:09 PM | #41 |
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Re: Shewman's High Flow Thermostats
If you look at the picture of the thermostat currently being sold for the 59A engine (post # 33) you'll see what's called a "jiggle plug" that falls down to let the air through when filling the engine
then lifts up to block that little hole when the engine is running. The Stant stat next to it, which is for a 1990 Subaru Justy among other modern cars, doesn't have that and would probably need a little hole to let the air through when filling. I believe that the holes drilled in these thermostats to increase flow are drilled all around that same surface that the jiggle plug is in. There is no where else to drill them. But, the mere fact that whoever designed and built this thermostat went to the effort to create a way to plug that one little hole when not needed for filling shows how important it is for the stat to close off entirely to work properly and how adding holes defeats the purpose of the thermostat. G.M. and Bob Shewman swear that drilling a bunch of holes in thermostats lets more water through and makes them better for hot weather. That's probably true but it defeats the purpose of the thermostat in cold weather or a long descent from a high mountain in hot weather.
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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; 08-02-2013 at 12:38 PM. |
08-02-2013, 12:30 PM | #42 |
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Re: Shewman's High Flow Thermostats
Keep up the quest Old Henry. I'm pulling for you. Drilling holes all around the thermostat to make it high flow is a joke.
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08-02-2013, 12:49 PM | #43 | |
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Re: Shewman's High Flow Thermostats
Quote:
Thanks.
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08-02-2013, 01:05 PM | #44 |
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Re: Shewman's High Flow Thermostats
Here's what all modern thermostats are competing against - Ford's original design.
These are NOS Ford stats for my 47 that a very kind barner has offered to sell to me. Just compare them with the modern stats and you'll see the real advantages of them. They have a butterfly valve that swivels clear out of the way of water flow. And, look at the size of that hole once it's opened up! Way bigger than any modern stats. And, the mechanism that opens it is small and much less intrusive into the water flow than modern stats. This is what I've been looking for and believe that, if they still work (I'll test before installing), they will work better than any modern substitutes for those reasons.
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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; 08-02-2013 at 01:11 PM. |
08-02-2013, 01:27 PM | #45 |
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Re: Shewman's High Flow Thermostats
Wow that is GOLD.
Having a good time following this thread and learning a lot. Prof. Henry, is there any chance you can post more photos when you get them? I'd be especially interested in seeing one in the open position. I'd also be interested in their opening temperature, and their closing temperature. It seems you will be interested in them closing correctly as the fluid cools on descent, preventing the temperature from dropping into an abnormally cool operating range, after being open during ascent. As I read it this is one of the areas you're looking for to get good performance. -VT/JeffH |
08-02-2013, 01:43 PM | #46 |
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Re: Shewman's High Flow Thermostats
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08-02-2013, 01:54 PM | #47 |
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Re: Shewman's High Flow Thermostats
Hope they work.If they do you better put that Barner on your yearly Christmas List.He has some generosity in droves. Good luck. ken ct.
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08-03-2013, 04:59 PM | #48 |
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Re: Shewman's High Flow Thermostats
Bought the Stant stat today and heated it up with the current replacement and here's what I learned.
Looking up through open stats. Looking down through open stats in the water. Just the appearance should convince of the higher flow of the Stant stat. If not, here's the data: The diameter of the opening above the valve for the water to pass through (the sharp metal edge) is 25 mm for the brass and 28 mm for the Stant. That alone is a 25% increase in space for the water to go through. The diameter of the valve plates is 27.5 mm for the brass one and 29 mm for the Stant. But, once that valve is out of the way that difference doesn't matter so much. The difference that really matters in the 25% larger opening of the Stant stat. Then you have the issue of the space above the valve seats that the water must pass through. That's where the biggest difference is as you can see in the pictures. Just eyeballing it I don't think the total area of the openings above the valve seat on the brass one is even equal to the area of the valve seat. So, the real restriction in the brass one is those openings that are so small. Whereas, as can be seen in these and the previous photos, there really isn't any restriction above the valve seat in the Stant stat. Those openings are clearly bigger than the area of the valve seat. So, my analysis suggests that the Stant stat has at least 25% higher flow than the standard brass ones now being sold for the 59A engines and likely even higher. To increase the volume of the brass stat to that of the Stant one you'd have to drill thirteen 1/8" holes in the space between the valve plate and the inside of the head neck, if you could fit them in there. But then, of course, you'd have a defective and pretty much worthless thermostat. And, the Stant stats are 30% cheaper than the brass ones - $7.00 from most suppliers compared to $10.00 for the brass one.
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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; 08-03-2013 at 08:27 PM. |
08-03-2013, 06:55 PM | #49 |
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Re: Shewman's High Flow Thermostats
The 12% sounds good but if you calculate the area of the openings you will find it to be more in the 25% range not counting the severe restriction on the brass one, then it looks more like 35-40% if not more.
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08-03-2013, 08:09 PM | #50 | |
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Re: Shewman's High Flow Thermostats
Quote:
Thanks
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08-03-2013, 11:17 PM | #51 |
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Re: Shewman's High Flow Thermostats
So having come this far, Just how much flow is required, and why do much bigger engines (of much higher hp output) function well with half as many thermostats? (I know about the ex. ports)
How many gallons per minute will flow through the standard stat, fully opened? and how many gallons per minute are required to meet the needs to sufficiently cooling the FHV8? |
08-03-2013, 11:33 PM | #52 |
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Re: Shewman's High Flow Thermostats
Bluebell I was thinking the same thing...
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08-03-2013, 11:36 PM | #53 | |
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Re: Shewman's High Flow Thermostats
Quote:
The only reason the flathead has two stats is because it has two water outlets, one for each side of the engine. Modern engines of any size do not have two separate sides like the flathead as far as I know. I suppose if you connected the two water outlets together with a pipe that size and had an even bigger hose to the radiator you could get by with one stat going from the T into the single hose. As far as actual flow needed to adequately cool a flathead, I wouldn't think there is one number. It depends on how hot the fire is in the engine. Very little flow is sufficient at slow speeds on even ground but a much larger higher flow is needed going at high speed up a hill. Anything less than ideal conditions of the engine block and/or radiator is going to require even more flow to make up. My 2¢
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08-04-2013, 12:09 AM | #54 |
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Re: Shewman's High Flow Thermostats
As JWL elluded to previously. The stat effectively stops or limits the water flow through the radiator until the stat begins to open (say 180F) it is fully open at say(200F)
These stats shown so far are all wax type stats. The wax expands to open them and contracts to close them. This is an action governed by the laws of physics. They are reliable. If your engine is fitted with them with no extra holes drilled in them, they will not begin to open until the water on the wax pellet side of the stat reaches the designed temp. Your engine CAN run colder under extreme external conditions, but for most of you in the lower states your minimum operating temp is governed by the opening temp of those stats. This is good. At the other end of the spectrum, conditions COULD be such that there is not enough differential between ambient temp and boiling point. I don't know how close these two temps can be, but it's going to be pretty hot. In these circumstances your stat is going to be wide open, and I doubt that flow though the stat is going to be the limiting factor. The point really is that most (I said most) people will have other issues with there vehicles, be it a dirty cooling system, loose belts, timing, (who always has their engine perfectly timed?) brakes dragging, fuel mixture,under inflation(tyres) and possibly a whole bunch of other things including up specing. All of these things have to be 100% right, before we blame the thermostats. Is Bob S. a member and can he give us a run down on any research he might have done? Does anyone have any flow specs? |
08-04-2013, 12:28 AM | #55 | |
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Re: Shewman's High Flow Thermostats
Quote:
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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; 08-04-2013 at 12:37 AM. |
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08-04-2013, 12:36 AM | #56 | |
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Re: Shewman's High Flow Thermostats
Quote:
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08-04-2013, 12:36 AM | #57 |
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Re: Shewman's High Flow Thermostats
Henry, I wouldnt publish his number in this public place.
I agree with your line of thought. I have enjoyed your postings. the photos make a big difference. Last edited by Bluebell; 08-04-2013 at 12:41 AM. |
08-04-2013, 12:40 AM | #58 |
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Re: Shewman's High Flow Thermostats
Fine. I took it out.
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08-04-2013, 09:18 AM | #59 | |
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Re: Shewman's High Flow Thermostats
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www.fordcollector.com Last edited by G.M.; 08-04-2013 at 09:24 AM. |
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08-04-2013, 02:02 PM | #60 |
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Re: Shewman's High Flow Thermostats
Pictures save a lot of words (such as in post # 59). It would be interesting to see such close-up detailed shots of Shewman's stats to see what they're really like. I can only imagine.
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