SHO thermostats...

[Shoaz]

sdpatt:
Just for accuracy, the 3.0L SHO was OEM fitted with an 82C (179.6F) thermostat and the 3.2L SHO was OEM fitted with an 88C (190.4F) version. Many "plebian" engines are supplied with 195F thermostats for emissions and mileage reasons. The 180F 'stats are usually referred to as "low temperature" versions. The only way to know the temperature at which the thermostat opens is to physically measure the temperature of the thermostat housing both upstream and downstream of the ******. It may be marked "82C," but it may actually open at 80C or 84C. You just have to check to be sure.

My 95 3.0 came with an 88C (192F) T-stat, and the 95 Helm manual shows the same part number (for the 88C T-stat) for both the 3.0 and 3.2. As far as I can tell the only 0EM T-stats for the SHOs have been 88C. There was a part change from an A version to a B version very early on to address corrosion issues, but all have been 88C.

You can check the article on shotimes and also research Ford part numbers for SHO motors to verify this yourself.

What leads you to believe that 3.0L SHO motors used a 180F T-stat?

 

[SHOZ123]

Off Road SHO:
SHOZ123

How did you find out what the cut-off temperature is? I thought it was at 150 degrees but I've been wrong so many times in my life before that I've gotten used to it.

Tom

It is buried in the Helm PCED manual, in the diagnostics for a rich mixture.

 

[sdpatt]

Shoaz:
My 95 3.0 came with an 88C (192F) T-stat, and the 95 Helm manual shows the same part number (for the 88C T-stat) for both the 3.0 and 3.2. As far as I can tell the only 0EM T-stats for the SHOs have been 88C. There was a part change from an A version to a B version very early on to address corrosion issues, but all have been 88C.

You can check the article on shotimes and also research Ford part numbers for SHO motors to verify this yourself.

What leads you to believe that 3.0L SHO motors used a 180F T-stat?

Both my 1989 and 1991 SHOs were supplied with 82C thermostats and that is all I have installed as OEM Motorcraft part replacements. Maybe my earlier statement should read, "the Gen I 3.0L SHO was OEM fitted with an 82C (179.6F) thermostat."

<small>[ August 04, 2003, 02:05 PM: Message edited by: sdpatt ]</small>

 

[Shoaz]

sdpatt:

Shoaz:
My 95 3.0 came with an 88C (192F) T-stat, and the 95 Helm manual shows the same part number (for the 88C T-stat) for both the 3.0 and 3.2. As far as I can tell the only 0EM T-stats for the SHOs have been 88C. There was a part change from an A version to a B version very early on to address corrosion issues, but all have been 88C.

You can check the article on shotimes and also research Ford part numbers for SHO motors to verify this yourself.

What leads you to believe that 3.0L SHO motors used a 180F T-stat?

Both my 1989 and 1991 SHOs were supplied with 82C thermostats and that is all I have installed as OEM Motorcraft part replacements. Maybe my earlier statement should read, "the Gen I 3.0L SHO was OEM fitted with an 82C (179.6F) thermostat."

Can you supply a part number or something? That's two very unusual t-stats.

As I mentioned, the only OEM thermostat part numbers for the SHO (that I've ever heard of), are E9DZ-8575-A, and E9DZ-8575-B. The Rev. A part is obsolete and the Rev. B part had some updated materials to deal with the bi-metal corrosives in the SHO motor, otherwise they were both 88C T-Stats. If there was ever a different part number (with a different opening temperature), then that would mean that the EEC calibration underwent a significant change sometime during production and that would be a very good thing to know.

 

[sdpatt]

Same part number, but I remember hearing (reading) that the 82C thermostats were no longer available through Motorcraft. Why? I don't know.

 

[Shoaz]

sdpatt:
Same part number, but I remember hearing (reading) that the 82C thermostats were no longer available through Motorcraft. Why? I don't know.

If it's the same part number then I don't know how it couldn't be an 88C T-stat.

 

[LaTechSHO]

Shoaz:

sdpatt:
Same part number, but I remember hearing (reading) that the 82C thermostats were no longer available through Motorcraft. Why? I don't know.

If it's the same part number then I don't know how it couldn't be an 88C T-stat.

I'm with you on this one, Ford does some crazy things with part numbers sometimes, but one part number has always meant one part....not an option... otherwise there would be no way of keeping inventory straight. Surely, if the temperature range difference did exist the part number would have some variation so that the catalog and inventory could be tracked accordingly. I will be changing the FACTORY installed OE thermostat out of my 1990 SHO this week and i'll see if it is in fact an 82C or 88C and post the results

Louis

 

[shojuan]

Shoaz:

sdpatt:
Same part number, but I remember hearing (reading) that the 82C thermostats were no longer available through Motorcraft. Why? I don't know.

If it's the same part number then I don't know how it couldn't be an 88C T-stat.

Because they didn't change the part number? It's all moot because the only thing available in that part number right now is the revised B thermostat in the 88C version. Works fine in MTX cars during blazing weather too.

IMHO if it was crucial for the Gen I cars to run with an 82C thermostat then Ford wouldn't have ditched the 82C thermostat so soon. This is partly why I'd like to hear Gary Morrell give a more recent statement on the issue than what he wrote in shotimes years and years ago. My stance has always been that with a cooling system in good working order the higher flow of the Motorcraft 88C thermostat combined with the higher heat differential will force more heat out of the system than a reduced flow (aftermarket) 82C t-stat.

If the 82C Motorcraft t-stat was still available it would be a good option to consider but since it's not I think the 88C Motorcraft t-stat is a better option than all the aftermarket t-stats combined regardless of temperature rating.

 

[shojuan]

Lol, the t-stat debate would be a good argument over a whole bunch of good beer at the next SHO convention! beer beer beer