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351C Cooling System
#1
The question about 351C thermostats came up again a few days ago, so I though I would post this, which will hopefully help.

EDIT: updated 6/22/2018


.pdf   351C Cooling System-v3.pdf (Size: 460.53 KB / Downloads: 9)



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#2
Thanks. That is good information.

mike

[Image: 1_11_11_13_11_50_27.png]
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#3
Very good information. Thanks for posting. Chuck
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#4
Thanks Don,

Good stuff as there is a LOT of confusion around this subject.

Jeff
1972 Q Code Convertible
1973 Q Code Mach 1 Ford Marketing Sales Vehicle
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#5
Don C;215259 Wrote:The question about 351C thermostats came up again a few days ago, so I though I would post this, which will hopefully help.

Hey Don, do you think that the new style "spring loaded" hat style would work/fit?...ever look or measure them?

Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic! thumb

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#6
If you don't get the thermostat right you can seriously screw up your engine.
And it may run perfectly normal, for a while. I remember buying one at a local
"auto parts store" only the wrong one, but it fit just fine.

mike

[Image: 1_11_11_13_11_50_27.png]
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#7
Gents-
Just want to make sure I have this right, since I have the "wrong" thermostat now, and there is no plate in the thermostat orifice.
For correct / proper cooling operation, there are two routes to go:
1) Use the stock setup as described in Don's attachment, requiring original type orifice plate and Cleveland correct thermostat.
2) Use the "Pantera" setup with West Coast Cougar restrictor plate and standard thermostat.

I've been following a couple of threads regarding performance issues related to this, but it's not clear to me what symptoms/ long term results of running with the wrong setup. I hear pinging, but I'm not savvy enough of an engine guy to put it all together.
Oh- and which temp range is best - the 180 or 192 degree.
Can someone enlighten me?

"A really great man is known by three signs-generosity in the design, humanity in the execution, moderation in success." -Otto VanBismark

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#8
EBSTANG;215344 Wrote:Hey Don, do you think that the new style "spring loaded" hat style would work/fit?...ever look or measure them?

I wondered that myself and bought one of each thermostat. The spring loaded mod motor thermostat is longer in the cold (closed) position than the 351C is in the hot (open) position so it won't substitute for the 351C thermostat.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#9
Don C;215377 Wrote:
EBSTANG;215344 Wrote:Hey Don, do you think that the new style "spring loaded" hat style would work/fit?...ever look or measure them?

I wondered that myself and bought one of each thermostat. The spring loaded mod motor thermostat is longer in the cold (closed) position than the 351C is in the hot (open) position so it won't substitute for the 351C thermostat.
figures...


Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic! thumb

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#10
Butch65;215354 Wrote:Gents-
Just want to make sure I have this right, since I have the "wrong" thermostat now, and there is no plate in the thermostat orifice.
For correct / proper cooling operation, there are two routes to go:
1) Use the stock setup as described in Don's attachment, requiring original type orifice plate and Cleveland correct thermostat.
2) Use the "Pantera" setup with West Coast Cougar restrictor plate and standard thermostat.

I've been following a couple of threads regarding performance issues related to this, but it's not clear to me what symptoms/ long term results of running with the wrong setup. I hear pinging, but I'm not savvy enough of an engine guy to put it all together.
Oh- and which temp range is best - the 180 or 192 degree.
Can someone enlighten me?

My personal choice is your #1, although many of the Pantera guys swear by #2 and say it has solved their over heating problems.

The 192° thermostat will generally make an engine run cleaner and more efficiently. Pinging can be caused by several things, such as too much initial advance, too much total advance, advance too soon, vacuum advance not working correctly or connected to the wrong vacuum source, or hot spots in the combustion chamber caused by carbon build up, incorrect spark plugs, head gasket protruding into the combustion chamber, etc. or substandard fuel quality.

If the problem is carbon build up, the 192° thermostat may help to burn the carbon out, but it may also increase the pinging. I run the 192° thermostat (4V closed chamber heads) and I have no pinging with pump gas.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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